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Electrovoice SP15 in open baffle

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Posted on April 26, 2012 at 06:19:00
stereohifi
Audiophile

Posts: 128
Location: canada
Joined: March 29, 2006



Here is my last DIY project based on a 2 way design with EV SP15 -not the SP15A- and a coaxially mounted LPG neodium aluminium tweeter.
I did bypass the ''brillance'' circuit out of the SP15.
I use the SP15 up to 1,8KHz at 1st order LP filter 6 dB/oct. and spread the tweeter with a HP filter alson with 6dB/oct. at 4KHz.
Theses where obtain after listenning tests. Voicing was clearly showing that the SP15 whizzer makes an excellent mid response.
Tweeter itself as a 1850Hz resonnace, so i had to use it at least an octave above, it proved to be be right at listening.
Since the EV SP15 as a QTS=0.45, i added a serie resistor to electrically increse the QT around 0.6 that also helped to match efficiencies bethween SP15 and LPG 26N tweeter.
A french web site by dominique petoin helped a lot.
Very dynamic and great details shows, i could listen to for hours.
I have 4 pairs of speakers with 2 differents tube amps, so i have a lot to compare to.
I took the idea of cyclop tweeter mounting from old Jensen hifi speakers.
It prooves that there's not much new under the sun with excellent designs from the 50-60's quality components.
enjoy!

 

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RE: Electrovoice SP15 in open baffle, posted on April 30, 2012 at 19:05:38
absolve2525


 
Very cool! I have a set of SP12B with the whizzer cone, awaiting attention. I pulled them from some raggity DIY boxes that were loaded with assorted crossover parts and unknown brand oval plastic horns. I'm not too familiar with that tweeter - where did you find them? I'd like to try something like your setup at some point.

 

RE: Electrovoice SP15 in open baffle, posted on May 3, 2012 at 05:44:39
stereohifi
Audiophile

Posts: 128
Location: canada
Joined: March 29, 2006



Hi, the tweeters are sold by:
http://www.solen.ca/pdf/lpg/26na.pdf

They are mostly used in car audio, but frankly they are great performers.
Theses are aluminium domes, they also have textile domes too.

 

RE: Electrovoice SP15 in open baffle, posted on May 3, 2012 at 05:49:58
stereohifi
Audiophile

Posts: 128
Location: canada
Joined: March 29, 2006



You may start this week-end end project that i did 2-3 years ago.
Very easy to implement and it sounds great! Enjoy

 

RE: Electrovoice SP15 in open baffle, posted on May 7, 2012 at 18:40:53
absolve2525


 
Cool! What is that project comprised of?

 

RE: Electrovoice SP15 in open baffle, posted on May 8, 2012 at 06:19:23
stereohifi
Audiophile

Posts: 128
Location: canada
Joined: March 29, 2006



It is a EV SP12B with a Peerless textile dome tweeter crossover at 2,5Khz.
Simple plywood 3/4'' thick and cut at 24'' x 48'' with a base holding the OB's plywood panels slightly at an angle 5 to 7 degres that's all.

EV SP12B is low-pass filter at 6dB/oct. around 2KHz.
Peerless tweeter high pass at 6dB/oct. 3KHz, i did spread the responses as both units comes close in gain near 2,5KHz.

Sounded great because i had 2 pairs of EV SP12B's, the buyer came for raw drivers only, but he heard this , he took them.

The EV SP15 project is more complex and difficult to voice, but once properly dialed, it sounds better than the EV SP12B's OB project, better bass, and more midrange defition and precision of tones.

Here's a pic of theEV SP12B's OB back quite simple week-end project.
Enjoy!

 

RE: Electrovoice SP15 in open baffle, posted on May 9, 2012 at 19:40:27
adaug
Audiophile

Posts: 723
Location: chicago
Joined: December 4, 2007
 cool! do you have a brace in the back to keep the weight of the magnet from tipping the baffle backwards?


-andre d

 

RE: Electrovoice SP15 in open baffle, posted on May 10, 2012 at 05:34:00
stereohifi
Audiophile

Posts: 128
Location: canada
Joined: March 29, 2006



Hi André, as you can see for the EV SP12B project , the base is actually two pieces that have a cut of 3/4in. cut at 7 degres.
The main panel is sturdy enough -plywood 3/4in.- it hold fine.

In my other open baffle project a PHY-HP OB , i did added a support at the back as i have side wings installed that weights more-see pic- it is attached to the top right down to the base, it's 3/4in. threaded rod.

 

RE: Electrovoice SP15 in open baffle, posted on May 14, 2012 at 18:06:19
absolve2525


 
Really Cool! Thanks for the pix and info!

 

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