PinoyDVD: The Pinoy Digital Video & Devices Community
Home Theater => Audio => Amplifier => Topic started by: @tomicZen on Jun 13, 2002 at 01:41 PM
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Anybody knows where I can buy amplifier for SUBWOOFER? How much? Any recommendations? I want kc to design my own subwoofer box.
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Hi @tomicZen,
I don't have specific answers for you. But am just curious, do you plan to put the amp inside the enclosre to come out with an active subwoofer or use an external amp for a passive sub? What's you budget, if I may ask? Because there are good active subs out there for even less than P10T without going thru the hassle of building one which could be more expensive. Just my opinion.
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atomiczen- We could make a custom made amplifier for your subwoofer. We had a lot of customers already who wanted this to power their passive subs and we had good feedback.
Just text me at 09175298004 if you need any clarifications or just to inquire. Thanks!
nirvblakr
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Anybody knows where I can buy amplifier for SUBWOOFER? How much? Any recommendations? I want kc to design my own subwoofer box.
hi @tomicZen,
if you are really into DIY, i saw some amplifiers in raon the other day that you can use for your subs. they range in price from 3T to 10T. just go around the stores there and i'm sure one of them will give you a decent price for it. the amps that i saw are the ones that you can easily mount at the back of your speaker cabinet or place in your A/V rack. i think the price varies on the output of the amp. :)
good luck. ;)
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bump for Imerb
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caohyde: where in raon mo nakita yung sub amp na pwedeng ilagay sa likod ng speaker cabinet?
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john5479
id think twice if I were you about mounting the sub amp on the backside of your sub enclosure. Most manufacturers of powered subwoofers have always mounted their power amps on the backside or sometimes under the sub enclosure. This is due to cutting production costs of having the amp mounted on a seperate chassis (much like a standard amplifier) which is very ideal if you ask me. Why you might ask? First you eliminate the problem of cooling the amp. If your sub in a tight corner then amp cooling would be compromised if it is mounted on the sub enclosure itself. You then get more flexibility in installing the sub in tight places and under custom cabinetry. Second..turning the power on would be very convenient for you if the amp is placed near your electronics stack instead of the backside of the sub. Third...No more searching for a power outlet near your subwoofer location. Imagine having no power outlet near your sub mounted amp. Problema di ba? Fourth...wiring the sub would be cheaper since you will be using long speaker cables rather than long RCA cables.
Advantages of having the sub amp built in on the enclosure itself? I can think of only one thing..space saver.
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thanks well anyway my budget is limited for these, ideally i prefer an amp with a crossover and yes I know its much more convenient if outboard ang amp but i haven't seen good budget ones.
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There's an excellent write-up about subwoofers and speaker placements on downloadable pdf format from the webiste of auido reviewer Richard Hardesty www.audioperfectionist.con (http://www.audioperfectionist.con) you may want to look into in your effort.
And listener (nice encountering you here other than my thread), one of the rules Mr. Hardesty recommends is it's better to place your amps closer to to speakers - use longer interconnects and shorter speaker wires. Any site with opposing viewpoint?
To those buying or constructing a sub-woofer, Mr. Hardesty is strongly against vented subwoofers and prefers sealed enclosure. He has 5 subwoofers in his set-up. Check out his reasons on the first two Journals donwloadable on pdf format.
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Hi,
Does anybody here has an idea where I can buy a subwoofer amplifier? Maybe around 50W to 100W. I have a passive subwoofer. Just want to make it active by just adding a sub amp.
Regards,
Tsong
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same problem here.. :) i would like to buy a 100 watt amplifier for a passive 10 inch sub..
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It's just the same amplifer as you would use to power a pair of speakers with.
Just make sure that it can handle impedance dip very well. (you really need GOOD QUALITY AMPLIFIERs for this) Because low range woofers can go down to 1 ohms. and it'll just $uck as much power as it can off the amp. especially for the really low notes. and your volume is high.
Either a Monoblock, OR bridged 2 channel amps.. will do the work for you.
Passive subs can acctually be better than active subs. some high end subs are acctually passive...
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Yes, a regular Amplifier would work if the signal has already been filtered...The high frequencies has already been filtered. I Think if your using 5.1 then this is possible......
if your going to use this for regular AUDIO..you would need an electronic crossover to remove the high frequencies....
You may also try a Car power Amplifier designed for a Subwoofer ..this should have an Electronic X-over...but an external Power Supply would be needed.. AC-DC converter....
I pretty much have the same problem, not being able to get an X-over for a Sub...I just inserted an equalizer between the Pre-amp and the Power Amp.. and I just put all the controls from 150 - 20KHZ to -12 setting...it aint perfect but it works fine by me....
another thing to try is if you can get a PASSIVE Crossover for a Subwoofer...it may not be the best idea, but it sure is cheap to try......I think thier available at most Electronics Shops... I Think I saw one at the DAI-ICHI showroom at Megamall......
goodluck...
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^Paradigm sells external Xovers. Dahil yung Servo 15 Sub nila DOESNT Come with one.
and they're cheap..
so i guess try their dealer.
X-10, x-20, x30
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There's an excellent write-up about subwoofers and speaker placements on downloadable pdf format from the webiste of auido reviewer Richard Hardesty www.audioperfectionist.con (http://www.audioperfectionist.con) you may want to look into in your effort.
And listener (nice encountering you here other than my thread), one of the rules Mr. Hardesty recommends is it's better to place your amps closer to to speakers - use longer interconnects and shorter speaker wires. Any site with opposing viewpoint?
To those buying or constructing a sub-woofer, Mr. Hardesty is strongly against vented subwoofers and prefers sealed enclosure. He has 5 subwoofers in his set-up. Check out his reasons on the first two Journals donwloadable on pdf format.
sir, lexmil I am also new in this "hobby". I am very much interested in building my own sub due to budget constrains. can anybody help us on this? anyway i've tried clicking on the link above but it seems there not availavle anymore....
can any give us advise? :)
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I built my sub using plans and parts from www.acoustic-visions.com. I used the 15" Tempest driver and the Parts Express 250w amp in a sealed enclosure.
Building the sub was easy enough but I had to import the driver and the amp.
I can't say I saved by by building the sub since there are a lot of cheap subs available. However, there's nothing that can approach my sub at its price. Total cost is ~$500.
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^Paradigm sells external Xovers. Dahil yung Servo 15 Sub nila DOESNT Come with one.
and they're cheap..
so i guess try their dealer.
X-10, x-20, x30
may paradigm ba dito?and where?
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Just to share some thoughts to those wanting to buy a separate amp for their passive subs.
It may not be totally adviseable to just use any home audio amplifier out there to drive a passive subwoofer. While there is no reason they can't drive one, there are specialized amplifiers that are meant to reproduce low frequencies very efficiently. The same kinds that drive electric bass guitars and used as bass boosters in cars.
There's this mode of amplifer operation based on its circuit topology or design identified by Classes. Many if not most subs(like Velodyne) and bass guitar amps use the Class D or switching amp. It has a basic design-inherent limitation in driving high frequencies(unneccessary anyway) and being non-lniear(what for?) Their main advantage is in the efficient use of electrical power, usually 85% - 90% They can be designed to generate lots of current as reuqired by bass frequencies. And when idle draw very little unlike class A, B or AB amps. In short their design and operation makes them very suitable to power subs.
(That's is why most powered subs using class D amps need not be powered down.)
Many powered subs use MOSFET ended Class D amps designed to drive 1 ohm loads necessary for extended low frequencies. You may want to consider such features in your haunt for a good amp to drive your passive sub.
You may also want to check this site for some basic principles in DIY subs.
http://members.hometown.aol.com/_ht_a/lmdmkm/index.htm (http://members.hometown.aol.com/_ht_a/lmdmkm/index.htm)
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mga repatoootss.. recommend naman sub amp kasi gusto kong gumawa ng sub kahit mga 70 watts lng po... ung mura ln i'm thingking of using a 8" or 10" targa.
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sir Ryan750, pa share naman ng box dimension ng 8in targa. i have two 8in targa, i made a lot of trials to attain the best possible and accurate low freq effect pero medyo stiff ang bass. i think di accurate yung dimension ng box, port length, port diameter...im using an alexan 100w mono amp kit and an alexan active low pass filter kit. any comment? thanks.. :)
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First, I agree with av_phile,
I've tried this one, and I ended up with a pair of burned transistors on my amp. An ECE friend told me this is a case of mismatch. Subwoofers usually require a whole lot of power to be driven and average amps can't handle loads this high. Kahit sa impedance point of view na lang, usually subs are rated at 4 Ohms and amps, usually at 8 Ohms. MISMATCH!
Bro Raycor,
meron namang nakalagay sa box ng targa subs ng box volume at kung anong box type, you may have missed it. It's also on their website. www.daiichi.ph. But that's the price of DIY, experimentation.
ALL IN ALL, if you have budget constraints, and may not be that knowledgeable about DIY powered subs, I would suggest buying a powered sub na lang instead of building one. Suggestion? Daiichi ASW-10DR, 4,250 pesos only, with dual 10" drivers, isobaric 4th order, freq. resp. range: 5Hz-300Hz. Mahihirapan kang gumawa ng sub that would cost less than that and could perform as well. Just my thoughts. :)
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sir arthurallanj saan po nakakabili ng asw-10dr na yon' at pwede po bang mahingi ang specs..
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sir arthurallanj saan po nakakabili ng asw-10dr na yon' at pwede po bang mahingi ang specs..
Sa Moses Aaron, look for Mike, pakisabi DJ Art referred you so you can get a 5% discount. It's at 623 G. Puyat st., Quiapo. Tel. no. 735-4390. Yun nga, it has two 10" drivers, placed in an isobaric arrangement, in a 4th Order bandpass enclosure. Max power: 200W. Line and speaker level inputs, sattelite speaker output. Volume level control and frequency cutoff adjustment ranging from 40Hz-300Hz. Frequency Response: 5Hz-300Hz. I think this is the best sub you can get for that price. I have two at home. TC, bro. :)
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mga bros, magkano ba ang amp na 300 w for subwoofer ? me ready made na bang nabibili? thnx ;)
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mga bros, magkano ba ang amp na 300 w for subwoofer ? me ready made na bang nabibili? thnx ;)
Marami dyang ready made amp for subs. Marami naman sa Raon e. But is this what you really want? If you're palnning on using it for home theater, I think mas convenient ang powered subs, in terms of ease of use, space, and even price. And you'd be certain na matched ang sub system mo if self-powered sya. Mas maraming considerations kasi if bibili ka ng amp and gawa ka pa ng passive sub. I think sub amps are only ideal for professional use only. But that's just me. :)
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bro arthur, i already have 15" sub powered by an outboard amp. because its amp is outboard, medyo convenient to change it anytime. what i have in mind is to have another amp to use para pagpali-palitin ko whenever i feel the need kung alam kong medyo pagod na ang isang amp, or whenever nangangati ang mga kamay ko at wala akong magawa hehe! ;D.
any idea about the price bro? thnks
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I've seen some heavy and fan-cooled power amps at Phasetron at Park Square 1, locally made professional amps costing no more than 15T. Bridgeable to deliver more than 300 watts in mono, if not mistaken.
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bro av_phile1 nabibigla yata ako,,, ang mahal pala. me alam ka rin bang budget price lang na sub amp na ikakabit ko na lang ung passive driver? thnkx-- ;D
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Well, none in the makati area, i suppose. I would suspect you can find a cheaper alternative in Raon. I think there are power amp kits in Deeco and better electronics shops, but may not be as powerful as what you have in mind. They're usually in the 100 wpc range. Then there are automoble sub boosters that retail at around 5T but you would need a high current 12 volt DC source which can be expensive as well. There are also locally made professional power amps in Raon that are very affordable. But they roll off below 30hz which is not my idea of a good amp for subs.
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I bought a Yamaha vintage amp in pier 2 years ago, 240watts plate rating, maybe 100wpc. Price is 3.5k. Put on the LOUDNESS switch, cut the treble and mid setting. I have a 12inch Konzert SW with dual voice coil. so my yamaha power each of the voice coil. The yamaha is connected to the pre-out of my AV receiver. This power my SW in HT mode (sometimes in stereo), its both a SIGHT and a SOUND. No need to spend much nor to experiment much.
a 50-70wpc amp can be bought at 2k-3k in pier.
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bro arthur, i already have 15" sub powered by an outboard amp. because its amp is outboard, medyo convenient to change it anytime. what i have in mind is to have another amp to use para pagpali-palitin ko whenever i feel the need kung alam kong medyo pagod na ang isang amp, or whenever nangangati ang mga kamay ko at wala akong magawa hehe! ;D.
any idea about the price bro? thnks
Dati, I saw an amp sub, stereo, rated at 100W per ch, it was priced at 3000, dito pa sa Bacolod yun. So, I'm sure you'd find something in that price range sa Raon, but of course, the quality wouldn't be as good as the ones mentioned by sir AV. You know what a friend of mine is into these days just to satisfy ang likot ng kamay? He bought several powered subs, opened them up, duplicated the amp circuits and made those sub enclosures by himself and chose his own drivers. So, parang DIY powered subs, duplicating the circuits that came with the subs he bought. I also plan to do that myself. I even plan to bi-amp a dual voice coil driver with a 2 ch sub amp, since I have a 2ch powered sub. Ang saya nito. hehehe. ;D
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Hey bros, thnks for all your responses-- maybe pag-iipunan ko na lang ung sinasabi ni bro av_phile na 15t- meanwhile isantabi ko muna ung iniisip ko unless me magbenta later ng kahit na second hand pero magandang sub amp-- ;D
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need to know the specs of subs before any recos can be made...check out digital dreams (sm city - cyberzone), soundroom at podium or acoustical space at megamall...they carry amps for the meanest subs there is...
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How about buying a car amplifier worth 6K paired by 6 ampere rating 12 volts transformer. The amp can be bolt directly at the back of your sub enclosure then transformer inside the box may built in crossover pa including gain! Paired with JL audio sub? I've heard car audio sub dumadagundong!
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hi
saan ba meron yung mga low pass filter na yan at lahat ng circuit sa loob ng sub pwera yung amplifier. gusto ko0 kasi yung may high level input at sattelite speaker output, variable crossover frequency. t.y.
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These are normally part of the powered sub-amplifer circuitry. Got to open a USAudio and DTX sub and those low pass variable filters, high level and satellite out conntections are part of the circuit board. Could be wrong, but I am not aware of these circuits being sold separately.
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NAKAKITA NA KO AMP FOR SUB
220v so swak sa bahay 300w complete w/ filters power supply etc.. just put at the back oy your enclosure price 4.5k. just contact jojod818 :-)
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bro ryan,
please post your experience with that new sub amp please-- ;D
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bro, jerix
di ko pa siya nabibi li ala pa budget nag inquire lng ako..:-)
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Hi,
Na mention na pala pangalan ko dito ;D, Ryan, sorry if I still haven't replied on your query about the sub filter. I have one working prototype available but my workroom is so messed up that I can't find my favorite shear cutter! ;D I'll tell you once I found it.
I'll start a new sub project next week, I'll keep you posted on the project's details. ;)
Cheers,
JojoD
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Hello guys new in this forum actually this is my 6th times to join this kind of forum. And I'm happy, I finally found this two "pinoy audio/video forum". I've started this hobby since 1998 and I'm still enjoying it, until now. but I have a dilemma in picking sub, actually this will be, probably my third sub my 1st is "ganzklar 200true rms" and my 2nd is velodyne cht-8 (sakit sa bulsa) tight and clean bass both music and movie, but lack in head room and deep bass ( but in small room sound very unbelievable ). But in this set-up I'm quite happy unless no rattling sound. Until one respected member from other forum offered me a free shipping delivery package, of "tempest (15")" subwoofer driver from "adireaudio.com" and a plate-amp 250/watts "300-794" from "partsexpress.com" for "DiY route". Mga kababayan Sinamantala ko na, I added three fostex fullranged driver for my mains and center channel and some other related accesories. I read some one here already build this "Tempest ", hope I can hear your experienced with this sub, also what type of enclosure have you made.
Btw the person will bring my stuffed here is Mr. Tim Forman "timn8ster" he's very kind her wife is Filipina, hope he'll join the forum too. Guy's, I'm just sharing my one time opportunity experienced sa paglalakbay ko sa internet audio and video forum. Maraming salamat
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bat wala ung pi-nost ko kanina???
ok, .... opinion nyo lang po i'll be using a 12" or 15" targa sv/dc sino ba ma T/S parameters nito penge naman. I will use a kenwoode kt-1000 amp 100wpch pero right lang na channel sira kc ung left eh. OK BA TO gamitin ko sana filter ni jojod818 kung magbebenta siya nun saken:-). Ang goal ko sa paggawa ng sub ay mambulabog ng kapitbahay ,is 15" rated at 500w can do the job? t.y.
my enclosure will be 24 x 21 x 26". saan ba pede magpasadya ng enclosure?
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bat wala ung pi-nost ko kanina???
ok, .... opinion nyo lang po i'll be using a 12" or 15" targa sv/dc sino ba ma T/S parameters nito penge naman. I will use a kenwoode kt-1000 amp 100wpch pero right lang na channel sira kc ung left eh. OK BA TO gamitin ko sana filter ni jojod818 kung magbebenta siya nun saken:-). Ang goal ko sa paggawa ng sub ay mambulabog ng kapitbahay ,is 15" rated at 500w can do the job? t.y.
my enclosure will be 24 x 21 x 26". saan ba pede magpasadya ng enclosure?
Hi,
You can ask for TS parameters for Targa subs at any Dai-ichi showroom, there is one in megamall.
Anthony, or Nirvblakr (don't know which is which, sorry), can build the box for you with matching finish. Though I suggest you experiment first before you do box finishing (para naman di masayang).
If the Kenwood amp can hold it's own, your neighboor's would probably call the local barangay tanod. ;D
Goodluck,
JojoD
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hi guys specially mga DIY'ers,
Can you tell me where I can buy an amplifier localy, im planning to build a DIY subwoofer and I particularly need a high power amp specially designed for subwoofer. similar to what branded subwoofer use kahit local lang basta may quality. or baka meron sa inyo nag aasemble ng sub amp dyan, please PM me.
your response is highly appreciated.
Thank you...
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sir,
meron po amplifier module na nabibili for professional powered speakers and they cost around 10k power is around 300wrms@8ohms ill try to post the no of the distributor/dealer :)
hi guys specially mga DIY'ers,
Can you tell me where I can buy an amplifier localy, im planning to build a DIY subwoofer and I particularly need a high power amp specially designed for subwoofer. similar to what branded subwoofer use kahit local lang basta may quality. or baka meron sa inyo nag aasemble ng sub amp dyan, please PM me.
your response is highly appreciated.
Thank you...
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sir,
meron po amplifier module na nabibili for professional powered speakers and they cost around 10k power is around 300wrms@8ohms ill try to post the no of the distributor/dealer :)
thanks sir.
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try jojo, i am sure he has something for you, or else you can try that shop opposite watson's at chinatown, they sell high powered amps in kits, "westrack" is the brand.
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try jojo, i am sure he has something for you, or else you can try that shop opposite watson's at chinatown, they sell high powered amps in kits, "westrack" is the brand.
thank you sir 2ny, ill PM sir Jojo. Ill also consider goin to chinatown this week and look for that "westrack" brand amp kit. thanks! your really a big help sa lahat. salamat ulit. :)
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the amp kit mentioned, is this a subwoofer amp complete with filters / gains or just an regular amp ?
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2ny,
are you still in Russia or back in Manila? I've been in that shop a lot of times, I believe the shop's name is Decibez and the kit amp's name brand is Westrak - very popular in the 80's and early 90's mobile groups. the chinese guy there said that his "kumpare" designed the amps but at close inspection it is a jbl "3-deep" emitter follower design - very powerful amp indeed!
qguy,
they formerly sell kit amps but due to a lot of returning customers with burned kits they decided to just sell fully assembled amp modules. you can buy the amps separately with or without their psu.
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how about the filters ?
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how about the filters ?
in the long time that i have been around raon I haven't seen one yet being sold in those shops. I just build them myself. it has a variable gain, variable frequency cut-off, phase switch, speaker level and line level inputs.
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in the long time that i have been around raon I haven't seen one yet being sold in those shops. I just build them myself. it has a variable gain, variable frequency cut-off, phase switch, speaker level and line level inputs.
sir I got ur PM.
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are you still in Russia or back in Manila? I've been in that shop a lot of times, I believe the shop's name is Decibez and the kit amp's name brand is Westrak - very popular in the 80's and early 90's mobile groups. the chinese guy there said that his "kumpare" designed the amps but at close inspection it is a jbl "3-deep" emitter follower design - very powerful amp indeed!
yes, i am in russia at the moment, will be back late july or august. despite what they might say, westrack amps are copied from designs out of magazines and databooks. i know when i see them. only semicon devices are different, so buying them is no hazzle, they are proven designs. even QSC design has been pirated and is being sold locally by you know who, but i am not going to dwell on that. we pinoys are great imitators, and we get away with it all the time. why we are ashemed to admit it puzzles me no end. ;D ;D ;D
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my brother has one, in fact they use Sanken powerpaks, lovely devices ;D.
anyway, i just thought you are still in Manila. ;D
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my brother has one, in fact they use Sanken powerpaks, lovely devices ;D.
anyway, i just thought you are still in Manila. ;D
this is picture of me at work in russia.... ;D
(http://i20.photobucket.com/albums/b201/tecson/tony1.jpg)
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this is picture of me at work in russia.... ;D
(http://i20.photobucket.com/albums/b201/tecson/tony1.jpg)
Sir oks na oks ah?
you might want to consider goin to St. Petersburg, maganda dun, went there last year...
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Tony, grabe lamig dyan! Regards to our comrades there. :)
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ou might want to consider goin to St. Petersburg, maganda dun, went there last year...
it's a good 9 hours flight from where i am now...but i plan on ordering some svetlana tubes from there..4x EL509's cost U$200 including freight....
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in the long time that i have been around raon I haven't seen one yet being sold in those shops. I just build them myself. it has a variable gain, variable frequency cut-off, phase switch, speaker level and line level inputs.
Sir i'm looking for this item meron kasi akong biniling subwoofer speaker kaya lang ang problema ko is to elliminate yung voice na lumalabas gusto ko low frequency lng. Kaya I went to megamall and bought subwoofer filter sa dai ichi . We test the filter wow ang lambot ng sound ng speaker pero when i use the filter sa bahay ngek mukang walang nangyari may voice pa rin na lumalabas hndi na filter .. ang daya naman nila malamang filtered na yung output ng amp nya bago kinabit yung subwoofer filter ko ... ang gulo ba :-[ ... any way bottom line po eh I need help para makagawa ako nito or bumili na lang kung meron kang available paki PM naman ako regarding price or spec ;D kailangan ko lang talaga... pasensya na po di ko alam kung OT ako dito
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is_otam_ap,
ang hirap naman i-type ng handle mo. ;D anyway, minsan kapag ang singer ay lalaki at malalim ang boses talagang may sumasabit pa din na kaunting low freq voice. pero ako hindi ko na naiintindihan yun sinasabi pag sub lang pinakikinggan ko. ;D
pero you are in luck, dalawa na ang versions ko ng aking sub filter. isang simple at siyempre isang hindi simple. pero pareho lang madaling gamitin. ;D
eto yun bago version under testing pa sa lab. (hataw, may lab na ako)
(http://www.filehigh.com/serve/13381/135447.jpg)
(http://www.filehigh.com/serve/13381/135448.jpg)
yun first version hanap ko pa picture.
:)
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JojoD818
;D sir pa PM naman ng price nung both simple and not simple ;D i'm very interested dito... paki pm na rin yung spec kasi sa 4ohms 100 watts pa taas ko po ito gagamitin salamat sa reply
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May supply ba itong nasa pic or input lang yun from amplifier?
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If you can design a filter with a steep roll-off, say 24db per octave, that should greatly minimize hearing vocals from the sub. Even if you put the cutover far below the threshhold of even the deepest human voice, if the roll-off is not steep enough, you can still hear that voice. I think that's the problem with some first order filters. 6db per octave gives a very gentle roll-off so you can hear much of the filtered frequencies even at moderate volumes. But a steep filter is quite complex.
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exactly, that's why some vocals still passes through. but as I said, if the vocals approaches or goes below the cut-off then you will surely hear it though it would be "unintelligent".
the one in the picture has 3 separate 12dB LPF cascaded for the cut-off frequency barrier, not including another adjustable 12dB LPF. the first 3 LPFs ensures that only the LPF with adjustable frequency passes through.
i think my website has one of my old 48dB Linkwitz-Reiley/Sallen Key LPF designs. however the F3 is fixed so no user adjustable frequency. kinda limited really.
May supply ba itong nasa pic or input lang yun from amplifier?
the red box is my dual rail bench psu and the rca are for input and output.
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If you can design a filter with a steep roll-off, say 24db per octave, that should greatly minimize hearing vocals from the sub. Even if you put the cutover far below the threshhold of even the deepest human voice, if the roll-off is not steep enough, you can still hear that voice. I think that's the problem with some first order filters. 6db per octave gives a very gentle roll-off so you can hear much of the filtered frequencies even at moderate volumes. But a steep filter is quite complex.
Just to add, you need at least an L-C filter to ensure you have steep roll-off. If you want a quickie, what I do is
+-----+inductor+-----------+------------+
| |
resistor |
| capacitor
capacitor |
| |
+--------------------------+------------+
You need to do some computation. Better get a college textbook or have some simulation software ready. That way it saves you from the hassle of the calculator.
Rascal101
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rascal101,
are you proposing a passive filter in an active sub?
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I'm just proposing a filter before the sub-woofer circuit (amplifying device).
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parang nabasa ko na ito sa forum ??? kaya lang hindi ko na mabalikan :'( ang alam ko meron ditong website na may computation ng filter circuit... ;D
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I'm just proposing a filter before the sub-woofer circuit (amplifying device).
i don't get what you're saying. ::)
you are proposing a filter before the sub-woofer circuit, which circuit? mine?
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Finally a subwoofer that is worth a penny hehehe! (Joke) just recently aquired a sub from a fellow Pdvd for only 4.9k (DTX 4.15) at makinis pa and not been repaired, sana maganda ang performance. my proposed 21" is now a dream again :'( ....
Anyways got a good review from the DTX 4.15 and so far its meeting my demand (played Zorro 2 and jurassic park) the explosion from the "nitro glycerin" is really making things in the room move. I set it at 50Hz on a 9oclock volume. using the Yamaha RCA subwoofer output and using only LFE, and it really blew me. parang yung na ramdaman ko sa THX theater sa makati...
Then while playing Jurassic, T-rex foot steps literally vibrates the windows, kailangan na ciguro mag upgrade ng room acoustics hehehe!...
while playing audio, the sub seems so quite and retaining the 2ch Euros 8 towers sound, just the way I like it... parang the sub works only on HT while playing audio cd's the only 5 channels are singing...
Thanks kay sir Porky... ;D
Anyways maganda pala itong DTX 4.15 so far ...
(http://i32.photobucket.com/albums/d16/hanns76/DSC00052.jpg)
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my proposed 21" is now a dream again ....
wow!!!! ;) dream ko rin yan..
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I change my mind... ::) instead of sub filter equalizer na lang bibilin ko hehe ;D