an ‘Art Nouveau’ take on Trio15 Horn1

Over the past years my travels have taken me to all parts of the globe.  I’ve met many unique and wonderful people and here is the story of one that stands out in particular, Mr. Jeff Hirsch.  Last year, a gentleman from Boston MA. reached out to me asking to use the audio components of our Trio15 Horn1 for a unique custom build.  I was a bit skeptical at first but after getting to know Jeff a bit, the decision was to provide these.  Jeff promised me his design will be original and unique.  A year after, in October 2018 we met in person, and I have to say, I was extremely impressed!

Jeff Hirsch is an artist, an Architect, a builder, a real estate developer, and he seems to be also a talented speaker designer.  Jeff has been designing furnishings, works of art and buildings for nearly 40 years.  His talents are visible in his works throughout numerous parts of Boston and Cambridge.  Over the past few years he has turned his attention also into speaker design.  Jeff is a long-time music and audio lover whose passion was kindled in his early teens building speakers with his father using Altec Lansing Voice of the Theater components.

Jeff’s latest take on the Trio15 Horn1 was inspired by the Art Nouveau furniture of Charles Rennie Mackintosh.  “The speaker baffles and frame take a very 2-dimensional speaker design and transforms it into a true 3-dimensional speaker”, says Jeff.  The overall sound is tremendous; full tight bass, lush flowing mid-range, and crisp sweet highs.  As with all our products, the sound is a sound of live music.
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Congrats Jeff for a great design and execution !

Deb from NY introduces a superb Leonidas Variation for Trio15TB

Few good months ago I received a mail from a customer, a very nice lady from NY, who is also a professional musician, name Deb. She purchased a second hand Trio15TB and kindly asked if we can provide her only the Leonidas Crossovers… We supplied the XOs and this simple purchase developed into a great, one of a kind experience !

I let Deb’s last email tell the story and only add that we applause Deb ! Our Trio15TB customers can now experience and enjoy her unique Variation on the Leonidas Crossover !


“As a former professional orchestral musician I have been studying live sound and performances for most of my life.  It is this sound of reality that I strive to convey from my systems and component designs.  Proper timbre, placement, articulations and overtone series are all areas of extreme importance when trying to accomplish a realistic sound.

I was fortunate enough to purchase a pair of Trio 15 TB speakers from a very talented woodworker named Jon Parkhurst of Wisconsin.  He made the baffles out of 5 different types of wood and I had never seen anything like them.  I think that they are stunning!  These speakers did not come with any crossovers so I ordered the proper Leonidas series crossover to see what the true intent of the design was.

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I received the units from Mundorf within about ten days after speaking with Ze’ev.  After letting things settle in for a number of hours it was finally time for a listen.  It was quite an experience to hear a commercial speaker that exudes the characters which I deem so important to realistic reproduction.  Instruments, voices, ambient space, and extremely accurate tonal reproduction were all rewards for purchasing these very fine speakers.
After some time with them in my music room I began to think about tailoring their sound even further.  If you have the Leonidas crossover units you can easily introduce or exclude different components into the crossover.  Changing values is equally as easy with no soldering required.
After doing some measurements and revised simulations I came upon a design that I really liked.  By changing crossover frequencies  with various component values I freed up the TB driver to perform over a more optimum frequency range.  This in turn allowed the lower frequencies to open up further.  The treble was also greatly improved as the TB full range had much less work to perform.  Also the reduction in driver overlap allowed a much more natural overtone series.  You could hear a violin as if it were directly in front of you and you could feel the wood body resonate.  This was it!!
You may be surprised that my series crossover is even more simple than the production circuit.  Fewer components and connections allow for less signal degradation and I believe this to be another plus to this version.
Ze’ev and Meir Mordechai (of Morel Speakers) have tested my crossover and have been very impressed.  Mr. Mordechai is one of my heroes in the industry and I have used his drivers in many successful designs.  To receive praise from him has been the greatest reward for all the time spent on this revision!
Due to the positive feedback Ze’ev has decided that he wants to offer this circuit as an option to the wonderful customers of PureAudioProject.  I humbly offer my work so that others may experience and enjoy even more from their Trio 15 TB speakers.
It has been an amazing process working with Ze’ev and I look forward to working with him on future projects.  He is a true gentleman and I believe his company is offering the best value in loudspeakers in the world!
Attached are some system photos and one of me.  Looking forward to hearing from you!”, Deb, NY

At Deb’s place:

At Meir Mordechai place:


Trio15 with Audio Nirvana Classic 8

To Audio Nirvana Fans ! Here is a build with AN Classic 8 and it works with the Leonidas XO.

Contact us for more details.

We also had configurations with AN Super 8, 10 1nd 12, Classic10 and Alnico15. All worked fine…

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Caps Mix on Leonidas XO, Trio15 Voxativ

Here is another swap option coming from Arold, a customer in Netherlands.

“Had several people listening to the speakers, but also for the LM 219. They are/were impressed with both.


I did a change on the filter: replaced the one big cap with: a mix of Jantzen Audio Superior Z-Cap / 2x Mundorf MCap EVO Oil / Intertechnik Audyn Cap Reference …. big difference. The biggest difference for me was the bass ….. massive. If you get the chance … and have the time …. try it! 

This is what i use:

1x Jantzen Audio Superior Z-Cap 22uF / 800VDC 
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2x Mundorf MCap EVO Oil 22uF / 450VDC 

1x Intertechnik Audyn Cap Reference 1,5uF / 600VDC 

1x Cornell Dubilier bypass cap van 0,01uF / 3000VDC

I managed to screw it all on the filter …. looks a bit like a … mess! 

The blog is a very good idea …. i think it will make clear that tuning a speaker … esp. yours because it is sooo easy to do  .. is a nice hobby. 
Best Regards,


Retirement Program !

Tannoy K3808 Dual Concentric 15″ Driver, Duet15 Configuration

Hi all, Omri Gino is an enthusiastic DIYer that showed interest to use his Tannoy K3808 Dual Concentric driver with our/Eminence OB-A15Neo (or OB-A15SE) 15″ drivers. Omri is also our industrial designer so he open baffle, various designs, the crossovers debates, posts etc… !