Topic: Speaker DIY'ers

[remington]

I'm no expert but I just noticed two unconventional things being done here. But maybe remington has special considerations here. One is, as Tony had noticed, is the absence of a throat (or is that the throat immediately after the tweeter) so no smooth transition here from tweeter to the horn itself. I doubt if there will be efficiency gained here without proper horn expansion. Two, I don't know why the stepped expansion. Maybe part of the design. But the stepped expansion will create distortion for the tweeter rather than reduce it. Sound will bounce at the insides of the horn and may cause delays. Btw, what is the frequency cut-off of this horn? Have you compared the tweeter's performance with/without the horn?

were still in the process of tuning it sir but so far the outcome is well better than expected it enhances the gain and overall performance of the vifa. I only put 2, 6.8uf capacitors each tweeter and bi amp it using lepai with Audio Nirvana and Mark audio.

What are your plans for finishing?

vinyl ang outer part and flat black spray paint inside sir.

sabi ko na nga ba.....Larry will chime in....

caotecue, kailangan bang my throat yung horn?

madali namang lagyan yan kung sakali....

nag tutuning pa kami ni kit master pero so far maganda na ang outcome well better than expected

[JojoD818]

vinyl ang outer part and flat black spray paint inside sir.

cool. please do keep us posted sir.

[camoteque]

Remington,

Are you bi-amping meaning the tweeter alone or using the lepai with the vifa, markaudio and audio nirvana, and then use another amp for the sub?

[remington]

Remington,

Are you bi-amping meaning the tweeter alone or using the lepai with the vifa, markaudio and audio nirvana, and then use another amp for the sub?

the vifa alone is being driven by the lepai the audio nirvana or mark audio is being driven by an el34 push pull power amp depending on which one I want to use and they are all connected together with a powered sub woofer to a tube pre amp with 3 outputs made by master tonyT.

cool. please do keep us posted sir.

sure sir!

[remington]

tuned...

[camoteque]

remington,

Just some questions to ponder and which might help with your design. Anyway, this is a diy thread.

I see that you're cutting the tweeter at 1.5khz (2-6.8uf). Your 1st order filter is not steep that your tweeter has output even below 1khz. Is the audio nirvana or mark audio driver not able to reach those frequencies well? There are more frequencies overlapping your 2 drivers in this cut-off which I think is not good. My unsolicited advice is to cut the tweeter higher depending on the output of the fullrange drivers. Btw, have you tried measuring the output without the tweeters?

Also, the vifa is driven separately by an amplifier so you have no issues with gain. Maybe a waveguide is better used than a horn if the issue is directivity. Just my 2cents.

Larry

[camoteque]

Sorry. I looked at the specs of the tweeter (XT25SC90-04) and it is 4 ohms (using 2-6.8uf 1st order). So the cut-off is 3khz and not 1.5khz. Isn't it a bad idea to cut at this range?

[remington]

the audible improvement in audio nirvana is quite small but can be heard and as for the mark audio it did help a lot in the directivity hindi na nawawala ang high notes pag wala sa sweet spot and I'm just referring to my system regarding the SQ of mark audio and not in general huh baka may magkamali . I'm just tuning it by ears and so far I liked the outcome but still experimenting on the cut off. I like to do it little by little to achieve the best sound possible... that I like.   BTW chose to use the horn not just for the sound but for the aesthetics as well

[RXV]

Sorry. I looked at the specs of the tweeter (XT25SC90-04) and it is 4 ohms (using 2-6.8uf 1st order). So the cut-off is 3khz and not 1.5khz. Isn't it a bad idea to cut at this range?

Sir,
Hindi ba cut-off is around 5.5khz @ 4ohms? I think what sir Remington uses is an Intertechnik brand capacitor with a value of 6.8uf, if I'm correct yan gamit niya. I also have that kasi, and also tried it (series, 1st order) with the same Vifa ring radiator, with very very good results paired with a fullrange.

Yan lang nga, I haven't tried it with a DIY horn like sir Remington's nice creation hehe

[camoteque]

were still in the process of tuning it sir but so far the outcome is well better than expected it enhances the gain and overall performance of the vifa. I only put 2, 6.8uf capacitors each tweeter and bi amp it using lepai with Audio Nirvana and Mark audio.
vinyl ang outer part and flat black spray paint inside sir.
nag tutuning pa kami ni kit master pero so far maganda na ang outcome well better than expected

Nakaparallel yata ang dalawang 6.8uf so It must be 3khz. Sensitive ang hearing natin sa frequency na yan kaya it's not good practice to cut at this range. But if the poster says, otherwise, who are we to argue. Kaya nga DIY eh.

[RXV]

Nakaparallel yata ang dalawang 6.8uf so It must be 3khz. Sensitive ang hearing natin sa frequency na yan kaya it's not good practice to cut at this range. But if the poster says, otherwise, who are we to argue. Kaya nga DIY eh.

Oh, 2 capacitors ba on each tweeter? I was thinking na, one lang for each tweeter.

Bro remington, pa-demo nga ulit sa "showroom" mo

[xbase]

tuned...

Wow, nabihisan na! ang bilis ng proseso ah... paglaki ko gagayahin ko din yan...

[remington]

Oh, 2 capacitors ba on each tweeter? I was thinking na, one lang for each tweeter.

Bro remington, pa-demo nga ulit sa "showroom" mo

sure bro he he...

Wow, nabihisan na! ang bilis ng proseso ah... paglaki ko gagayahin ko din yan...

he he he may stand pa yan bro para maipatong sa ulo ng alien.

[remington]

in action on top of the MA box

[markcrenz]

Have you run a frequency sweep? Walang comb filtering effect?

[remington]

tuning it by ears lang sir mark so far maganda naman ang effect. I tried tri amping last night, this horn was powered by a lepai and my 2 other FR speakers are powered by tubes all of them are connected to a 3 output tube pre amp ganda ng harmony nilang tatlo mahirap i describe yung SQ, maganda para sa akin

[markcrenz]

There could be some boosts and cuts at certain frequencies kasi while the sound bounces up and down as it exits the horn. Pero sabi mo naman maganda, di enjoy na lang! 

[Gino]

Nanginginig naman sa tuwa si Remington so smoothened na ang response.

[xbase]

I tried tri amping last night, this horn was powered by a lepai and my 2 other FR speakers are powered by tubes all of them are connected to a 3 output tube pre amp ganda ng harmony nilang tatlo mahirap i describe yung SQ, maganda para sa akin

Ung nahihirapan sa bi-amping, tuturuan kayo ni Remington ng tri-amping, di pa kasama sub jan...

[remington]

masarap kasi mag experiment lalo na pag maganda nagiging outcome thats the wonder and exitement of diy kumbaga masarap kumain ng spaghetti pag maraming keso hehe (added attraction and flavor) wala lang color para sa pandinig ko lang naman

up and down ba ang bounce ng sound nito, hindi ba palaki?

[remington]

Ung nahihirapan sa bi-amping, tuturuan kayo ni Remington ng tri-amping, di pa kasama sub jan...

experiment lang bro he he!

[RXV]

masarap kasi mag experiment lalo na pag maganda nagiging outcome thats the wonder and exitement of diy kumbaga masarap kumain ng spaghetti pag maraming keso hehe (added attraction and flavor) wala lang color para sa pandinig ko lang naman

up and down ba ang bounce ng sound nito, hindi ba palaki?

Sige, next time na session ako diyan, may kasama pang spaghetti ha... hahaha

[remington]

Sige, next time na session ako diyan, may kasama pang spaghetti ha... hahaha

ayos hehe...

[tony]

@remington, baka gusto mong pag-aralan ito....http://www.diyaudio.com/forums/multi-way/217298-square-pegs.html

[remington]

@remington, baka gusto mong pag-aralan ito....http://www.diyaudio.com/forums/multi-way/217298-square-pegs.html

ok ito master pwede pag experimentuhan he he!

[remington]

tried the paraline folding





testing


will try a different appraoch an oval shape next time...

[tony]

yung oval with 2 3 inchers and a compression drivers ang type ko gawin...
looks easy with 1/4 inch plywood, ano kaya resulta?

[remington]

next time master subukan ko sa tv speaker at vifa yung oval kung ano maging SQ so far itong square parang naging mid high ang vifa 2.2uf ang gamit na caps.

[fredreadrick]

contemplating on the materials of my next project.
ok kaya ito as an enclosure?

engineered bamboo

[Gino]

Iyan ang hinahap ko for my planned desk. Saan mayroon niyan?