Curiosity and wanting to make something got me into looking at the feasibility of a 60 degree Synergy horn.
This would be purely for Hifi volume listening / Home Theatre use.
Using 2 x 8" LF drivers - Faital 8PR200s (as the SM60F) or Eminence Beta 8As (I know I like the Eminence Kappa 12A sound, but don't know if that counts for anything, but they are cheaper).. or plenty of other 8" drivers.
For MF and HF - instead of going coaxial, how about a 2.5" or 3" (if it would squeeze on), sealed back paper cone driver pair, or even 4 of?
There are plenty of 100Hz to too more than plenty high small drivers.
Peerless do a closed back one that's looks good.
Dayton and others do too.
Then on HF my trusty Vitavox S2 compression drivers.
I know I like the S2 sound - already used them on Tractrix and Le Cléac'h horns and have them currently on the SH50-alikes I made, after trying and not finding the BMS4550s to my taste.
I've been measuring up and jiggling a to scale'ish plan drawing.
Could be done with similar compact 530mm square flare as the SM60F.
I've not finalised the tap and port placings yet, but something like this.
What do the Synergy builders reckon?
Method or madness?
This would be purely for Hifi volume listening / Home Theatre use.
Using 2 x 8" LF drivers - Faital 8PR200s (as the SM60F) or Eminence Beta 8As (I know I like the Eminence Kappa 12A sound, but don't know if that counts for anything, but they are cheaper).. or plenty of other 8" drivers.
For MF and HF - instead of going coaxial, how about a 2.5" or 3" (if it would squeeze on), sealed back paper cone driver pair, or even 4 of?
There are plenty of 100Hz to too more than plenty high small drivers.
Peerless do a closed back one that's looks good.
Dayton and others do too.
Then on HF my trusty Vitavox S2 compression drivers.
I know I like the S2 sound - already used them on Tractrix and Le Cléac'h horns and have them currently on the SH50-alikes I made, after trying and not finding the BMS4550s to my taste.
I've been measuring up and jiggling a to scale'ish plan drawing.
Could be done with similar compact 530mm square flare as the SM60F.
I've not finalised the tap and port placings yet, but something like this.
What do the Synergy builders reckon?
Method or madness?
60 degrees is a nice angle in theory. You may end up with a slightly longer waveguide and wider mouth for the same lower frequency compared to wider. The range of a waveguide of this size might be coverable by the average 1" CD, so the benefits you see here might be in the area of the upper cross.
I think if I am going to build a 60° version - it would be a SH60 alike dimension wise, not the smaller SM60..
I'd use the same trusty 2 x 12" Kappa 12A drivers only 4 MF and of course the 1.5" throat Vitavox S2 compression drivers, I love for my hifi room use.
The external measurements are
28" X 28" X 22" - near as damnit the same as the SH50s, just a few inches shorter due to the wider angle.
This way I get to compare 50° Vs 60° in true sense (all other things as equal as can be), and I don't run the risk of working away at a SM60 size with smaller MFs and LFs I might not like.
The SH60s should they equal or better the SH50s would have pride of place in the hifi listening room.
The SH50s can be in store all ready to go with the BMS 4550s comp drivers loaded when there's a private garden party or family wedding to do.
For the sheet material and extra drivers, I think that's an excellent deal.
I didn't realise at first but those cutaway pics are of the SH60s
It's this pic that's the give away - 6 MFs
The box dimensions are
Tap and port placings I can't work out.
I've read that PA folk don't see much difference between the two formats in operation..
Wonder how that translates to the hifi room?
Also did Danley really need another 2 MFs squeezed in there - it makes the ports rather larger for those extra drivers - perhaps not such a good thing for the comp driver wavefront (again thinking Hifi use).
Experience of 50 Vs 60 gratefully received.
(AI made up experiences not welcome🙂)
I'd use the same trusty 2 x 12" Kappa 12A drivers only 4 MF and of course the 1.5" throat Vitavox S2 compression drivers, I love for my hifi room use.
The external measurements are
28" X 28" X 22" - near as damnit the same as the SH50s, just a few inches shorter due to the wider angle.
This way I get to compare 50° Vs 60° in true sense (all other things as equal as can be), and I don't run the risk of working away at a SM60 size with smaller MFs and LFs I might not like.
The SH60s should they equal or better the SH50s would have pride of place in the hifi listening room.
The SH50s can be in store all ready to go with the BMS 4550s comp drivers loaded when there's a private garden party or family wedding to do.
For the sheet material and extra drivers, I think that's an excellent deal.
I didn't realise at first but those cutaway pics are of the SH60s
It's this pic that's the give away - 6 MFs
The box dimensions are
Tap and port placings I can't work out.
I've read that PA folk don't see much difference between the two formats in operation..
Wonder how that translates to the hifi room?
Also did Danley really need another 2 MFs squeezed in there - it makes the ports rather larger for those extra drivers - perhaps not such a good thing for the comp driver wavefront (again thinking Hifi use).
Experience of 50 Vs 60 gratefully received.
(AI made up experiences not welcome🙂)
Not much difference between 60 and 50, some guys don't even notice it looking at wire frame models😉
Take a look at a protractor and see what difference it would make in your listening room.
More HiFi folk prefer 90 degree horizontal coverage (x45 vertical) over 60x60 or 50x50.
One 90x50 sounds better than two 50x50 splayed.
I'd prefer a 90x45 over a 60x60 at home or in a PA, unless in a narrow, deep, tall room.
Funny that 12 years after the wire frame was posted (by accident) DSL still has not put the SH60 frequency response chart on it's spec sheet.
The SH60 uses a higher excursion, higher power 12" than the SH50 (which uses higher power, higher excursion drivers than the Kappa 12"...), and ~50Hz Fb compared to 90Hz.
The SH60 uses 4" mid drivers, the SH50 5".
A wider pattern lowers on axis sensitivity and low frequency loading, two more smaller mids are required to keep up.
For home use, if you do decide on the slightly wider format, 2x5" would be enough for 2x Kappa 12".
Art
Yes a casual look at the wire frame 😗
My room is long and narrow. Getting away from the Tractrix and Le Cleach 1st reflections was one of the things that I really liked about the 50s.
They sit with sides parallel to the side walls (as Danley once wrote) and point in giving very nice coverage for me where I sit.
If it perfect - probably not.
I guess I'm just curious and like building things, could do a 70 or80😀 They would be wider and that would be a problem with the room in Cinema mode though.
If we moved and I got a more average shaped room, 90s would be on the menu.
Thanks for explaining the 4" vs 5" and the LFs used in the 60s...
My room is long and narrow. Getting away from the Tractrix and Le Cleach 1st reflections was one of the things that I really liked about the 50s.
They sit with sides parallel to the side walls (as Danley once wrote) and point in giving very nice coverage for me where I sit.
If it perfect - probably not.
I guess I'm just curious and like building things, could do a 70 or80😀 They would be wider and that would be a problem with the room in Cinema mode though.
If we moved and I got a more average shaped room, 90s would be on the menu.
Thanks for explaining the 4" vs 5" and the LFs used in the 60s...