3way OB project with Peerless & Fountek drivers

fivestring · 16th March 2009, 06:39 PM

here`s my latest 3way OB loudspeaker project in a beautiful cabinet made by Bozidar Kroflic, from Celje, Slovenia. Since we both love the sound of dipoles, this is what we came up with. Photos were taken before I started to measure them and develop the crossover. The drivers are following:

tweeter - Fountek Neo CD 3.0 MB

midrange - Peerless HDS-134NOMEX

woofer - Peerless SLS-315

Cheers!

Miro

http://www.loudspeakers.we.bs/

jerome69 · 17th March 2009, 08:09 AM

Hello,

I made a similar loudspeaker
2 Peerless SLS 315
1 Peerless SDS 134 and I tested the Peerless HDS 152
1 Vifa DX25TG-05-04 and seas 27TFFC for rear tweeter.

My crossover frequency is 500Hz and 3kHz.

This is a response in non achenoïc conditions

A distortion curve

I tried the HDS 152 instead the SDS 134, the HDS was too much cleaner without life and didn't fit with the boomers.

I used the same inductor like you for the boomer 10mH // RC (for the 1.8kHz peak) followed by a RC and RLC to equalize the dipole peak.

This speaker sound very good for its price but you need an extra strong amplifier to drive correctly the 2 SLS315, the impedance is 3ohms @ 50Hz.

fivestring · 17th March 2009, 08:24 AM

Very interesting, I like the idea of a dipole tweeter, I guess they sound excellent? Since it looks thinner, does the baffle resonate?

gainphile · 17th March 2009, 08:40 AM

I always found flat black speakers looks nice

The fountek... is rear cover permanent or can it be made dipole ?

fivestring · 17th March 2009, 08:44 AM

Quote:

Originally posted by gainphile
I always found flat black speakers looks nice

The fountek... is rear cover permanent or can it be made dipole ?

I`m not sure, but I think it could be done...

jerome69 · 17th March 2009, 09:08 AM

You should try the dipole tweeter, you shouldn't do it anymore without this.

Yes they sound very good but the amplification needs to be strong if you want an airy sound and a huge soundstage.

In this case the panel did not resonate because there is two small panels reinforcement in the back, it's very efficient. The panel is very rigid. But in this case the shape is not optimum and the wood wasn't very good because the density was not enough. I think the rigidity of the panel is very important. I notice the wood must be good (good density and good hardness). You should a good architecture of the panel, some reinforcements or a thick panel etc. And you should avoid mass air load causing resonance.

fivestring · 17th March 2009, 09:12 AM

Yes, I believe you`re right about everything you said, thanks!

jerome69 · 17th March 2009, 10:39 AM

You have made a very good loudspeaker

fivestring · 17th March 2009, 10:45 AM

Thanks, I hope so!
I might turn the ribbon into dipole too, if all goes well...

16th March 2009, 06:39 PM	#1
fivestring diyAudio Member Join Date: Apr 2008 Location: Brezno (Abyss)	3way OB project with Peerless & Fountek drivers here`s my latest 3way OB loudspeaker project in a beautiful cabinet made by Bozidar Kroflic, from Celje, Slovenia. Since we both love the sound of dipoles, this is what we came up with. Photos were taken before I started to measure them and develop the crossover. The drivers are following: tweeter - Fountek Neo CD 3.0 MB midrange - Peerless HDS-134NOMEX woofer - Peerless SLS-315 Cheers! Miro http://www.loudspeakers.we.bs/

17th March 2009, 08:40 AM	#4
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	I always found flat black speakers looks nice The fountek... is rear cover permanent or can it be made dipole ? __________________ http://gainphile.blogspot.com

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17th March 2009, 08:09 AM	#2
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Hello, I made a similar loudspeaker 2 Peerless SLS 315 1 Peerless SDS 134 and I tested the Peerless HDS 152 1 Vifa DX25TG-05-04 and seas 27TFFC for rear tweeter. My crossover frequency is 500Hz and 3kHz. This is a response in non achenoïc conditions A distortion curve I tried the HDS 152 instead the SDS 134, the HDS was too much cleaner without life and didn't fit with the boomers. I used the same inductor like you for the boomer 10mH // RC (for the 1.8kHz peak) followed by a RC and RLC to equalize the dipole peak. This speaker sound very good for its price but you need an extra strong amplifier to drive correctly the 2 SLS315, the impedance is 3ohms @ 50Hz.

17th March 2009, 08:24 AM	#3
fivestring diyAudio Member Join Date: Apr 2008 Location: Brezno (Abyss)	Very interesting, I like the idea of a dipole tweeter, I guess they sound excellent? Since it looks thinner, does the baffle resonate?

17th March 2009, 09:08 AM	#6
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	You should try the dipole tweeter, you shouldn't do it anymore without this. Yes they sound very good but the amplification needs to be strong if you want an airy sound and a huge soundstage. In this case the panel did not resonate because there is two small panels reinforcement in the back, it's very efficient. The panel is very rigid. But in this case the shape is not optimum and the wood wasn't very good because the density was not enough. I think the rigidity of the panel is very important. I notice the wood must be good (good density and good hardness). You should a good architecture of the panel, some reinforcements or a thick panel etc. And you should avoid mass air load causing resonance.

17th March 2009, 09:12 AM	#7
fivestring diyAudio Member Join Date: Apr 2008 Location: Brezno (Abyss)	Yes, I believe you`re right about everything you said, thanks!

17th March 2009, 10:39 AM	#8
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	You have made a very good loudspeaker

17th March 2009, 10:45 AM	#9
fivestring diyAudio Member Join Date: Apr 2008 Location: Brezno (Abyss)	Thanks, I hope so! I might turn the ribbon into dipole too, if all goes well...

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