Love these ... just very cool, thanks for sharing.
What Tom Danley has hit on here is remarkable. I really have wanted to experience the Synergy approach myself, ever since I saw his designs. I've always wanted to mix a live event thru a Synergy rig, I've yet to get the opportunity. However, I did get the opportunity to spend a day with AVS'er/DIYSoundGroup'er bwaslo, and hear for myself his incredible DIY Co-Synes ... which is his interpretation of TD's amazing idea.
Well these things have a unique characteristics ... and imaging capability that didn't disappoint. Sitting directly in front of the either the right or left speaker (in a two-channel, L-R setup), a nice center image was maintained in a quite modest, non-dedicated room (even way off the center line). The design has tons of potential IMO. bwaslo spent next to nothing on driver cost/parts, a decent compression HF, and cheapo mids and woofs.
Seriously, with a $50 HF driver, $2, 2" mids, and woofers that were under $10 apiece, he achieved something extraordinary. So yeah, the Synergy design approach is remarkable. What I experienced was great results regardless of cost. However, when one factors expense into the equation ... the result is truly astronomical.
About the sound;
It possessed a naturalness and ease that doesn't typically emanate from a loudspeaker. The coherency and smoothness was very nice. It's like that one inexplicable experience, we've all had, that initally pulls you into the hobby ... that you spend a lifetime trying to re-create .. but here, with these, you have access to that anytime you want it. Natural Sound, not like a speaker. Those were my thoughts during my 2.5 hour trip driving home that afternoon.
The theoretical benefits of pattern control/controlled directivity realized down reaching toward the Shroeder freq, with low distortion techniques combining to radiate as a phase coherent point source.
So the image throw is one whereby there's just one coherent controlled lobe, and if you aim it at the opposite side seat, you can utilize time/intensity trading to cover a nice wide listening area. Also, what reflected energy does re-encounter the listening, it possesses the same level of coherence. With such pattern control, efforts to tame early reflected energy to achieve an adequate ITD gap, may not be as necessary as with other less controlled throw designs.
In other words, you get more direct sound, less reverberant smear. Other non-controlled designs are fine, but the lateral energy must be dealt with. As we've learned, if you absorb, you must absorb broadband. Do-able, but a nicely controlled throw is a elegant alternative.
LTD, you're right, the distortion lowering tricks are cool too. Using multiple small cones, the break up is pushed up well damped. The bandpass approach is an acoustic filter, lowering harmonic distortions, ...and the more offensive/higher order products are lessened the most. Certainly a win-win scenario. The acoustic low pass/distortion filtering has got to be a key factor in the naturalness I heard, lowering out of band energy etc.
The time/intensity trading contributed to a nice listening session, despite me sitting in front of the left main.
I'm sure the key elements of the driver chambers sizes, 1/4 wave interactions (throat and chambers), the ports and the port tunings, that would all be quite a juggling act of tradeoffs. All the while going after all the reduction possible of out of band output, filtering as much THD as you can. Fascinating ... beyond me.
SpeakerScott, again thanks for sharing, enjoy those bad boys ...
Flat, Deep, Clean, Linear, and Loud
Active 16.8kw, 7.3 system
(3)Seaton Cat12C up front, (4)QSC K8 sides/rears
(2)Seaton SubM-HP, (4)18" IB