Author Topic: Speaker DIY'ers (Read 308528 times)

jerix · « **Reply #210 on:** Dec 22, 2004 at 08:35 AM »

Quote from: timn8ter on Dec 20, 2004 at 09:46 PM

Why? Are you concerned that your amp is rated for 8 ohms and the speaker says it's a 6 ohm? The rating is a "nominal" resistance. Speakers are dynamic, not static resistance. A 6 or 8 ohm rating is just the average. The actual resistance will change with frequency. It could be as high as 40 ohms or as low as 3 ohms at different points. Chances are, if you have a solid state amp rated for 8 ohms and the speaker is 6 ohms it will probably play fine. If you're worried you could put a 2 ohm resistor (or even higher) on the positive terminal of the speaker but this may change the way the speaker sounds. However, it may be a change for the better!

TIM! Youre veryvery CORRECT!

this has always been an issue to me --- pero at least i know now what to do in case i again would try to experiment something which i really dont understand

JojoD818 · « **Reply #211 on:** Dec 22, 2004 at 12:21 PM »

Quote from: Handyman on Dec 21, 2004 at 09:31 AM

Jo, nasubukan ko na Saving Private Ryan...di ko malakasan eh...nadinig na rin ng may ari last sunday. Sana nga may pagkakataon kayong marinig..

Di ko pa sya nafinish...mag post ako ng pics pag tapos ko na...

Merry Christmas Bro...

Bon,

Bilib ako sa mga finish mo pre, lalu na yun speakers na ginamit sa audio fair. I'm sure maganda din yan finish sa sub, kahit sa pic eh makita ko man lang.

Merry Christmas din bro!

timn8ter · « **Reply #212 on:** Dec 22, 2004 at 10:13 PM »

Merry Christmas everyone!

Handyman · « **Reply #213 on:** Dec 23, 2004 at 11:34 AM »

Quote from: timn8ter on Dec 22, 2004 at 10:13 PM

Merry Christmas everyone!

Merry Christmas To All!!!...

Asktig · « **Reply #214 on:** Dec 23, 2004 at 06:06 PM »

HAPPY HOLIDAYS!

Mga bossing help naman. I have this 100w 8ohms class-A stereo amplifier, gusto ko sana mag-setup ng 3way speakers para d2. Ano ang ma-rerecommend nyo na wattage ng woofer, mid-range and tweeter para sa ganitong set-up? Ok ba kung ang crossover network ko d2 ay yung mga ready-made na, tulad ng nabibili sa daiichi?

Thanks!

Asktig · « **Reply #215 on:** Dec 24, 2004 at 09:29 AM »

Quote from: Asktig on Dec 23, 2004 at 06:06 PM

HAPPY HOLIDAYS!

Mga bossing help naman. I have this 100w 8ohms class-A stereo amplifier, gusto ko sana mag-setup ng 3way speakers para d2. Ano ang ma-rerecommend nyo na wattage ng woofer, mid-range and tweeter para sa ganitong set-up? Ok ba kung ang crossover network ko d2 ay yung mga ready-made na, tulad ng nabibili sa daiichi?

Thanks!

preferably ang woofer na ilalagay ko mga 8", i already had the baffles for it.

Jagner · « **Reply #216 on:** Jan 06, 2005 at 06:36 PM »

Quote from: Asktig on Dec 23, 2004 at 06:06 PM

HAPPY HOLIDAYS!

Mga bossing help naman. I have this 100w 8ohms class-A stereo amplifier, gusto ko sana mag-setup ng 3way speakers para d2. Ano ang ma-rerecommend nyo na wattage ng woofer, mid-range and tweeter para sa ganitong set-up? Ok ba kung ang crossover network ko d2 ay yung mga ready-made na, tulad ng nabibili sa daiichi?

Thanks!

Hi,

IMHO, Mahirap magsabi ng wattage ng woofer, mid-range at tweeter kasi hindi wattage ang basehan sa pag-gawa ng speaker systems, kundi sensitivity at yung T/S parameters ng bawat speaker driver. The wattage normally described at the back of a speaker driver is either the nominal (meaning normal operation) or the maximum (short/peak operation) allowable power a driver can handle. You have to pay attention to the sensitivity of the driver. Mataas ng yung wattage eh kung masyadong mababa naman yung sensitivity ng driver, eh kakapusin yung amp mo.

Regarding crossovers, the 3-way crossovers sold at Dai-ichi are OK, 12-dB ang cut-off, and most of them are rated to work with 200-400 watt amplifiers. Note that with crossovers, there is an expected loss of about 2-3 dB for each driver because crossover networks also power eaters.

I would suggest to drop by the dai-ichi showroom at megamall and experiment with the different drivers and crossover networks, then you choose what suits your ears.

Hope this helps.

Cheers.

jerix · « **Reply #217 on:** Jan 07, 2005 at 06:48 AM »

bros, are there specific drivers that are designed to be positioned facing the floor, just like the the subwoofer featured above? m askin this because it is my impression that for a period of time, gravity may win over the strength of the ordinary driver if not particularly designed for this application. thnks --

timn8ter · « **Reply #218 on:** Jan 07, 2005 at 07:10 AM »

To determine this you'll need to do a little math to calculate the percentage of "sag" the driver may experience which is a combination of the acoustic compliance (how soft is the suspension) and the moving mass of the driver. Adire Audio wrote up a short tech paper on the subject.
http://www.adireaudio.com/Files/TechPapers/DriverOrientation.pdf

odyopayl · « **Reply #219 on:** Jan 07, 2005 at 12:20 PM »

To Speaker DIY'rs Masters, do you have any Schematic Diagram for Center speaker Crossover? (Typhical 2 way 3 speaker system). I have my HTIB in my bedroom, speakers are cheap lang, I want to upgrade & experiment with Crossovers for my initial tweaking. Maraming salamat po!

kenchix1 · « **Reply #220 on:** Jan 07, 2005 at 12:51 PM »

tanong ko lang po mga sir, anong 4 inch driver na 8ohms na at least 100watts ang maganda, malakas at matibay ?

nasira kasi yung isang speaker ko, gusto ko sana palitan.

thanks po.

timn8ter · « **Reply #221 on:** Jan 08, 2005 at 04:17 AM »

In reply to the last two posts.
1. For a HTIB you may be able to get very good results switching to a good full range driver solution. This could be Fostex FE127E or FE167E in the Fostex recommended enclosures. No crossover would be needed for the speakers, only the subwoofer which I assume already has one. These models are shielded so could be used as a center channel placed directly on the television or monitor. Perhaps this solution is not "impressive in appearance" but it is "impressive in sound quality".

2. I hope I'm understanding your question correctly. I apologize if I misunderstand. To replace a driver within an existing system requires finding one with the same electrical/mechanical specifications as the original design. Resistance (ohms) and wattage (power handling capability) are not the critical specifications to gauge this with. The only 4" driver I currently stock is the Fostex FE127E (closer to 4.5") but it is a full-range driver usually put into single driver enclosures.

kenchix1 · « **Reply #222 on:** Jan 08, 2005 at 09:48 AM »

Quote from: timn8ter on Jan 08, 2005 at 04:17 AM

2. I hope I'm understanding your question correctly. I apologize if I misunderstand. To replace a driver within an existing system requires finding one with the same electrical/mechanical specifications as the original design. Resistance (ohms) and wattage (power handling capability) are not the critical specifications to gauge this with. The only 4" driver I currently stock is the Fostex FE127E (closer to 4.5") but it is a full-range driver usually put into single driver enclosures.

thanks for the reply. So it means, I have to find a 6 ohms, 150watts 4 inch driver. The enclosure I have is from NSP60's rear speakers. (NSP60 rear has one tweeter and one 4" driver). Would it be a problem if I put in an 8 ohms (100watts or higher) 4 inch driver in both of it (both rear) ? The inside of the enclosure is bare, and I cant see any dividing network in it. I'm not going to use it as a rear anymore anyway that's why I plan to replace the driver.

Thanks again.

timn8ter · « **Reply #223 on:** Jan 08, 2005 at 11:56 AM »

I'm sorry but that's just not enough information to answer your question. There is much more to a speaker driver than the ohms and watts. I referring to the Theil/Small parameters that defines a speakers electro/mechanical properties. If there is no crossover network in the box then I'm assuming it has a Piezo tweeter which typically do not need a crossover. Judging by the size of the box something like the Bravox 3 1/2" driver sold by Parts Express (part number 269-680) would work. I know that doesn't help you much but that's the best I can do. Other than that it's going to be a "best guess effort" to find a suitable replacement.

alabonjo · « **Reply #224 on:** Jan 11, 2005 at 09:42 AM »

Guys want to shared to you my diy fostex fe167e from Bob Brines and Timn8ster guidance
chiep to build vs hard to build = hi fi sound

you'll find this at Bob Brines & Timn8ster webste gallery

jerix · « **Reply #225 on:** Jan 11, 2005 at 10:25 AM »

Alabonjo -- ganda nito --

how much ba lahat lahat, minus labor --

wanderlust · « **Reply #226 on:** Jan 11, 2005 at 10:34 AM »

ganda sir..... congrats!

JojoD818 · « **Reply #227 on:** Jan 11, 2005 at 10:38 AM »

alabonjo,

Great job dude! so how's the sound?

Vhongbiker · « **Reply #228 on:** Jan 11, 2005 at 12:29 PM »

alabonjo,

sir galeng ah! congrats.... narra ba sya sir?

Titanium · « **Reply #229 on:** Jan 11, 2005 at 12:45 PM »

How much kaya yung mga drivers na ganyan?

I want to build one.

timn8ter · « **Reply #230 on:** Jan 11, 2005 at 01:12 PM »

Quote from: Titanium on Jan 11, 2005 at 12:45 PM

How much kaya yung mga drivers na ganyan? I want to build one.

Php4200 each at http://www.pi.alegriaaudio.com/prod02.htm

Handyman · « **Reply #231 on:** Jan 11, 2005 at 01:35 PM »

Bernard...Congrats bro!..

eto naman yung 3" Tangband drivers...

Jagner · « **Reply #232 on:** Jan 11, 2005 at 03:00 PM »

Bon,

Nice Work... can be used as BGM speakers for restaurants & cafes, ala Bose Acoustimass... gawa ka na kasi ng catalogue...

kid · « **Reply #233 on:** Jan 11, 2005 at 05:28 PM »

Galeng mo Sir Bon! heard this speaker before...

sa sound...

iceman90a · « **Reply #234 on:** Jan 11, 2005 at 07:54 PM »

galing mo Bon! as usual

ano tunog nyan Pre? btw - paki pm cell mo, nag crash yung cellphone ko kaya di ko na alam numbers nyo

alabonjo · « **Reply #235 on:** Jan 11, 2005 at 09:41 PM »

For the priced I payed with the driver, bargain 'coz Timn8ster bring it here
with out any shipping fee

(also his not in the business pa, anyway still affordable

),
I think he both it from "madisound".
For the other material like "mdf", I used 1 whole sheet in 3/4" thick.
Also the front panel is stucked with solid 3/4" national tree of course "narra".
For the performanced, for the priced you paid, superb

If you love jazz even "rnb" music will handle very well specially jazz vocals
acoustic bass you wont believe it and you wont believe that you build them!
The mid and high so detailed and clear and the bass region handle so well
plus the "magic" 3D & stereo imaging and dissapearing effect.

Guys I'm just using my Onkyo 601, What else if Hi fi stuff audio gear.

Sir Bon Ang danda nyan! hope sooner (went Tim Visit again

) Ill build for
my home theater.
Thanks again!

JojoD818 · « **Reply #236 on:** Jan 12, 2005 at 12:15 AM »

Bon,

You never cease to amaze me, lalu na at gamit mo palagi yun favorite color ko ng wood!

You the man! err the "woodman"!

Handyman · « **Reply #237 on:** Jan 12, 2005 at 09:05 AM »

Jagner, thank you...catalogue?

punk kid, thank you.
iceman90a, sir vince, sent you pm.
alabanjo, thanks din..baka magpadala uli dito si Tim, magpareserve ka na

JojoD, Thanks Jo, kaya mo din to bro..lots of sanding from 120 to 600 grit then apply Tung oil.

Titanium · « **Reply #238 on:** Jan 14, 2005 at 09:18 AM »

Quote from: timn8ter on Jan 11, 2005 at 01:12 PM

Php4200 each at http://www.pi.alegriaaudio.com/prod02.htm

Thanks for the info. Another newbie question-- are these drivers cross-overless? meaning, you just connect them directly to the speaker output of the amp. Im planning to use a 12 Watt tube amp.

timn8ter · « **Reply #239 on:** Jan 14, 2005 at 09:56 AM »

There is no crossover, however, the design alabanjo built uses a BSC (baffle step compensation) network and a Zobel (impedance correction) circuit. This can lower efficiency about 3 db but it's still efficient enough that a 12 watt amp has no trouble driving it.