SynTripP: 2-way 2-part Virtual Single Point Source Horn

After all those testing I came to conclusion that the midwoofers are not that important, but CD is critical.
I tried several: Celection included in PSY144 and first Bwaslo Synergy model, also 1425 and 1747, PRV and Peerless 2535 and newer was completely satisfied.
It doesn't proof anything - one day I have a dealer of High End audio store from Honolulu come to me to check chinese litlle hybrid amplifier ($230). I connected it to Bwaslo Synergy and he was in shock.
He repeated over and over; "That's is impossible, that's is impossible".
Funny thing is that I had only one speaker!
So the Synergy conception offer some unique qualities, but I really like the sound of 100db+ ribbons and perhaps chasing a dream))).
BTW. That JBL2435 is the first CD that doesn't have the " shouting " sound.

I've heard a pile of Synergy and Unity horns, everything from the Lambda Unity to the Danley SH50 to the SPL unities.

Bill's Synergy Horns are right up there. I think the SH50 is a little bit better at "disappearing" due to the much larger mouth, but I think the treble on all of Bill's horns is noticeably smoother. (Likely due to efforts to control diffraction.)

Long story short - they're really tough to beat. I honestly think that if someone mass produced them they would be competitive with speakers costing $50K+

Bill's speakers sound more "hi fidelity" than traditional "hi fidelity" speakers do.
 
I've found the Celestian CD is not as smooth as I would like, so I am going to give one of these a test.
BMS 4594ND

Overview

The box will remain two way from the amps perspective, with a passive crossover for the 4594ND.

A friends develops speakers and uses these, and suggested a crossover circuit that he believes couples them optimally.

If you can live with a crossover point of about 1200-1500Hz, the JBL 2408H-1 will give you most of that BMS goodness for about 20% of the cost. It's really really nice.

I'm using BMS 4552ND in my current project, but the 2408H-1 is quite competitive with it. The main reason I opted for the 4552 over the 2408H-1 is because I'm 3D printing the waveguides and my software can't do threaded adapters.
 
Patrick, is there a bolt-on version of the 2408H-1? I can't abide the screw-on types :(

Unfortunately no, the 2408H line of drivers are all screw-on, I have the 2408H and would like to try a different waveguide but haven’t since all the good ones are bolt-on and I don’t want to change drivers.
Denovo has a nice adaptor that I plan on getting one day and it might just be the right thing for you guys with screw-on drivers too.
 
phivates,

No it's more a matter of the extra length the screw-on throat requires between the diaphragm and the horn's throat. It's like having a section of pipe there (actually that exactly what it is!) and in a Unity type horn limits how close you can get the midranges' ports in the horn to the CD's diaphragm. The better bolt-ons have minimal length there.

It also tends to make the higher frequencies more beamy, as their directivity up there is more or less set by that pipe unless you add a diffraction zone there.
 
Ok I was looking at a co-ax application but your explanation for the Uni-gee makes sense, since a long throat is not what wave guides seem to be about. The 2408 does have a phase plug which extends to the end of the pipe, but these have not survived prosound use, which is why I have a pair to repair. Thanks for the reply

FredM
 
I have been using my 2408H with the JBL 6x6 PT waveguide since 2010 if I'm not mistaken and before that I had RS28A and Seas 27TDFC, I have tried going back to the domes a couple of times for comparison but each time they didn't last more than a couple days but I ended up returning to the JBL CD and waveguide, I love them.
I do plan on building another setup for another room eventually with the Seas tweeter loaded on the SEOS 8 waveguide. Unfortunately I don't have the means to build or the room for a Syn setup.
 
My current setup is a set of bookshelfs (B&C 8PS21 + JBL waveguide) nearfield on a desk setup and with my iMac there's no room left so the speakers couldn't be more than 10,5" wide. :(
In the future I plan on building another setup for another room and that will have more room for the audio, so perhaps I'll look into the Syns again but I don't have the means to build them and I would have to have someone build them for me but I don't know anyone who can make speaker cabinets around here and building something like this isn't very easy for someone who is not familiar with speaker building.
 
Have some progress!
 

Attachments

  • 2.jpg
    2.jpg
    96.6 KB · Views: 871
  • 3.jpg
    3.jpg
    92.8 KB · Views: 869
  • 4.jpg
    4.jpg
    94.7 KB · Views: 862
Thanks USRFobiwan, but it's not:).
It's really messy to work with and needs finishing work.
I tried several materials for mold including gypsym, bondo, cement and liquid rubber :mad:

Cement, bondo and gypsum are cracked too easy.
So I place under the cone of the woofer "innovative support system" and use cone as the mold:)
 

Attachments

  • 5.jpg
    5.jpg
    99.8 KB · Views: 340
  • 1.jpg
    1.jpg
    96.3 KB · Views: 333
  • 3.jpg
    3.jpg
    93.8 KB · Views: 803
  • 2.jpg
    2.jpg
    94.3 KB · Views: 813
  • 6.jpg
    6.jpg
    90.6 KB · Views: 379
  • 8.jpg
    8.jpg
    97.9 KB · Views: 383
Last edited:
Hi Folks

I am looking at building this, but with a slight mod. The subs I have are a little narrower than the full 676mm of the original SynTripP and I would like to be able to stack to tops over the subs. To do this I would need to decrease the width down to 610mm.

Would increasing the height and depth so that the same volume existed in the rear chambers offset any negative effects of a reduced width?

I recognise this will change performance, but might be fun to try :) Where would you suggest making the adjustments?