I'll have to dig up my measurements, but I remember seeing a slight off axis coverage degradation from non-axisymmetric loading of the horn. On axis the FR of 1 vs 2 vs 4 was identical except sensitivity and distortion. Off axis, less so...
Depends on where you put the midrange. See my meas at
http://www.diyaudio.com/forums/multi-way/292379-small-syns-8.html#post4787283
The vertical "up" is a little different than the vertical "down", but either is quite acceptable (to my ears), not even sure which I would say is better. And note that the highest dark grey curve in each familiy-of-curves plot is already the 45 degree off-axis curve (it's a +/-20 degree vertical horn I think). Most of any imbalance is likely that the horn isn't centered vertically in the baffle.
I saw a bigger degradation - in the tweeter region - from having two extra midrange ports.
http://www.diyaudio.com/forums/multi-way/292379-small-syns-8.html#post4787283
The vertical "up" is a little different than the vertical "down", but either is quite acceptable (to my ears), not even sure which I would say is better. And note that the highest dark grey curve in each familiy-of-curves plot is already the 45 degree off-axis curve (it's a +/-20 degree vertical horn I think). Most of any imbalance is likely that the horn isn't centered vertically in the baffle.
I saw a bigger degradation - in the tweeter region - from having two extra midrange ports.
Last edited:
Interesting...I wonder if it has to do with the location, or the horn profile.
I don't remember seeing any degradation of the tweeter on mine. I tested that by measuring the tweeter with the holes open, then I taped over them and tested again. I am using a four sided flare, like your earlier Synergy sets.
-Scott
I don't remember seeing any degradation of the tweeter on mine. I tested that by measuring the tweeter with the holes open, then I taped over them and tested again. I am using a four sided flare, like your earlier Synergy sets.
-Scott
The main difference I saw in the tweeter was down around where it crossed over to the midrange, some bumps there that complicated the crossover even more, but also some up around (I think) 8kHz. That was with the Celestion tweeter, I never used more than the two ports with the Tymphany. Certainly not show-stoppers, but I couldn't see adding another mid or three for what looked like no advantage at all but a number of disadvantages. Probably if the horn were closer to a square or circle with midrange vertical directivity, I'd be more concerned, but the horn isn't doing anything vertically down around crossover except giving a close-in mounting position for the midrange (for which two drivers would effectively double the center to center distance).
When I reduce my PSE144 to 2 mids (instead of 4) I got 470hz dive down.
Attachments
Aloha Patrick.
I build Bills version and I compare it to Danley. The difference is obvious. Even Bill's version is more home friendly you cant beat the quality of transducers. The latest idea of Bill with one (or two mids) seems very interesting. it's not that hard to got mids to sound and measured right in Synergy.
Hi Sergey,
I think different port depth or compression vol might be needed when you change #ports at same location. At least they m9del a little different in Horn Response on some. Don't know about PSE144 though.
Also, did you cover the unused ports? If not they might act like resonant traps.
I think different port depth or compression vol might be needed when you change #ports at same location. At least they m9del a little different in Horn Response on some. Don't know about PSE144 though.
Also, did you cover the unused ports? If not they might act like resonant traps.
Last edited:
What is differencce between spherical vs. Slot ports for mids? I presume slots make less harm tor highs.
thank you for sharing your plans with us. im so happy to build this 🙂
do you think, the speakers are loud enough to use it as tops in a PA system for 100 people?
do you think, the speakers are loud enough to use it as tops in a PA system for 100 people?
I like a chamber that starts out as a cylinder and ends up as a slot. When the wavefront from the compression driver radiates over the waveguide surface, you're going to get diffraction off the midrange taps. The use of a slot achieves a couple of goals:
1) Because a slot is narrow, the diffraction will only happen at a specific time. (When the wave passes over it.)
2) Because a slot is tall, it has a fairly large surface area. A big surface area is "nice" because if you have a small surface area you can run into compression. I've had some Unity horns that I've had to trash because the compression ratio was too high.
Very nice PB. I was looking at building something similar with my mids and ports also. I was looking at using slot ports to try something different. Although my method would be much more crude in the delivery. Havent started my design yet as I have been gone a lot with work. Will be using TPL-200 and Celestion 0414 mids.
Hello, many thanks for the plans SpeakerScott.
I was going to desing my own synergys with the aid of Bwaslo's spreadsheet and all the info in this forum, but actually I have very little to no time to spend for this, also my knowledge designing speakers is totally 0.
So your build matches very fine with what I want. I am planning to put 2 of them side to side on top of one Martin 215mk3 and 2 Othorns. This will be for reggae venues mostly.
Do you think the 2 synergys will keep up with the rest of the system? People amount may round 100, on outdoors and medium size places.
Many thanks.
I was going to desing my own synergys with the aid of Bwaslo's spreadsheet and all the info in this forum, but actually I have very little to no time to spend for this, also my knowledge designing speakers is totally 0.
So your build matches very fine with what I want. I am planning to put 2 of them side to side on top of one Martin 215mk3 and 2 Othorns. This will be for reggae venues mostly.
Do you think the 2 synergys will keep up with the rest of the system? People amount may round 100, on outdoors and medium size places.
Many thanks.
idea was that I have not much space here, thanks guys.
I go redesign then the crossover, I have the equipent, this after circlotron is ready and mine home restored.
regards
So I read through the thread, really beautiful speaker! i consider building some as well. Since i might wanna use them for small audiences outdoors also - does anybody know what SPL they are capable of reproducing? i didnt quite find information on that.
Hi,
I'm looking to design and build some synergy horns for PA use, going to be a long project I think but hoping to get first prototypes done by summer...
I'm looking at potentially using one of BMS' planar wave comp drivers... wondering whether the waveguide built in to these drivers will make life difficult with design?
Thanks in advance for any answers!
I'm looking to design and build some synergy horns for PA use, going to be a long project I think but hoping to get first prototypes done by summer...
I'm looking at potentially using one of BMS' planar wave comp drivers... wondering whether the waveguide built in to these drivers will make life difficult with design?
Thanks in advance for any answers!
my synergy itteration
Sometime in april during lockdown here in Austria, I once again started to look for DIY Synergy Horns and stumbled over Scott´s build.
Regarding his backround and experience in audio, I was quite assured that the shiny description in the first post of this thread, wasn´t just a guy thrilled by his own work.
Although there were some doubts along the way, when looking at the price and the weight of the parts, i.-g the big caps for the XO are almost as much as the tweeter and how would it even compare to my "highend" ribbon twetter that cost as much as one complete synergy horn with wood and XO ?!
Would it be worth it, investing so much time and money in such a complicated enclosure?
The answer is YES!!!
My old system was very very good, but it lacked some punch and directness in the mids as a lot of this type of hifi tend to have.
The horns have the same amount of detail as my old system, but they do everything so effortless, at every level.
The 50$ tweeter is mindblowing, and the tiny midranges and cheap bass speakers, impress me every day. Price isnt everything, i know that NOW.
Had guys with 5-figure systems at home over, who couldn´t believe what they heard and left quite sad.
I don´t have the words and intention to wrtite a colourful sound description.
Trust Scott and my words: "They really are THAT good!"
The inner horn, top, side and bottom are black mdf boards. The rest is solid oak, with a little brass inlay at the horn mouth.
In case anybody wants to see more build pics and vids you can go over in to my instagram and look in the synergy-build- stories.
Login • Instagram
They are driven with DIRAC room correction, which imho does great things, especially in the sub region in my tiny room. They have surprising bass, but the last octave is taken care of by a big 15" BR Sub.
Planned to build proper stands for my horns, but decided to go for a second a sub underneath and finally get the rid of the sub in the center of the room.
My old system has found a new happy home and love my Synergies every day 🙂
Thanks Mr. Hinson for this amazing work
-Sergej
Sometime in april during lockdown here in Austria, I once again started to look for DIY Synergy Horns and stumbled over Scott´s build.
Regarding his backround and experience in audio, I was quite assured that the shiny description in the first post of this thread, wasn´t just a guy thrilled by his own work.
Although there were some doubts along the way, when looking at the price and the weight of the parts, i.-g the big caps for the XO are almost as much as the tweeter and how would it even compare to my "highend" ribbon twetter that cost as much as one complete synergy horn with wood and XO ?!
Would it be worth it, investing so much time and money in such a complicated enclosure?
The answer is YES!!!
My old system was very very good, but it lacked some punch and directness in the mids as a lot of this type of hifi tend to have.
The horns have the same amount of detail as my old system, but they do everything so effortless, at every level.
The 50$ tweeter is mindblowing, and the tiny midranges and cheap bass speakers, impress me every day. Price isnt everything, i know that NOW.
Had guys with 5-figure systems at home over, who couldn´t believe what they heard and left quite sad.
I don´t have the words and intention to wrtite a colourful sound description.
Trust Scott and my words: "They really are THAT good!"
The inner horn, top, side and bottom are black mdf boards. The rest is solid oak, with a little brass inlay at the horn mouth.
In case anybody wants to see more build pics and vids you can go over in to my instagram and look in the synergy-build- stories.
Login • Instagram
They are driven with DIRAC room correction, which imho does great things, especially in the sub region in my tiny room. They have surprising bass, but the last octave is taken care of by a big 15" BR Sub.
Planned to build proper stands for my horns, but decided to go for a second a sub underneath and finally get the rid of the sub in the center of the room.
My old system has found a new happy home and love my Synergies every day 🙂
Thanks Mr. Hinson for this amazing work
-Sergej
Attachments
Last edited:
