Feasible synergy attempt?

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mark100

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#1
Hi all,

Thinking about first synergy attempt.
Would like to use the CD I've been using in all my builds ... bms4594he.
Hoping the b&c 6ndl38 might make a good match, crossing from somewhere around 650Hz & up
Would like response down to 100Hz to match my other DIY tops
(response, not pattern control 🙂)

Is this driver combination feasible? Better choice(s) down low?
Would like to start with a strong driver candidate to learn modeling and begin designing trial box.

(I'm just getting started digesting the super synergy guides/tools/posts from Messieurs Danley, Waslo, McBean, and so many helpful folks...)

Thank you ! Mark
 
#2
mark100 said:
Would like to use the CD I've been using in all my builds ... bms4594he.
Hoping the b&c 6ndl38 might make a good match, crossing from somewhere around 650Hz & up
Would like response down to 100Hz to match my other DIY tops
(response, not pattern control 🙂)

Is this driver combination feasible? Better choice(s) down low?
Click to expand...
Mark,

The B&C 6ndl38 seems feasible, though probably would require four drivers to "keep up" with the BMS4594he at 100 Hz.
With an acoustic crossover around 650 Hz, cone driver options up to 10" (perhaps even 12") could be used, requiring only a pair of drivers.

Art
 
#3
Thanks Art,
that's the kind of starting info I'm looking for.
I haven't dug into Bill's spreadsheet and hornresp enough yet, to see if larger drivers can be placed in the horn, to work with 650Hz.
I guess it's time to dig in...maybe I could just try a pair of the 12" mb12n351 used in the PM 90/60s ?

While I have you, cause you're a likely one to know....
Will a synergy, built with whatever cones needed to work here,
sound than better than the PM boxes, enough to be worth the effort?

I know that's asking you to make a judgement call that only I can make..
but I'd really value your opinion.
 
#4
mark100 said:
I guess it's time to dig in...maybe I could just try a pair of the 12" mb12n351 used in the PM 90/60s ?

While I have you, cause you're a likely one to know....
Will a synergy, built with whatever cones needed to work here,
sound than better than the PM boxes, enough to be worth the effort?
Click to expand...
Mark,

Considering you already have very good sounding HF horns, with better polars than are likely from a two part conical based horn, and Peter Morris' DIY (if we are talking about the same) has better LF output due to it's folded/ported horn, it seems you may be pursuing a lateral move not likely worth the effort.

What do you think would be improved upon over your present dual front loaded mid-bass/HF horn system by a multiple entry horn?

Art
 
#5
weltersys said:
Mark,

Considering you already have very good sounding HF horns, with better polars than are likely from a two part conical based horn, and Peter Morris' DIY (if we are talking about the same) has better LF output due to it's folded/ported horn, it seems you may be pursuing a lateral move not likely worth the effort.

What do you think would be improved upon over your present dual front loaded mid-bass/HF horn system by a multiple entry horn?

Art
Click to expand...

Thx Art, and sorry for the slow reply.
Girlfriend wanted to take a fun roadtrip 😉

I guess my hope for improvement is to simply better 'co-locate' acoustic sources. I feel any further tuning refinement gains have become too insignificant to matter, and just wanna find a way to keep improving the sound.

Oh, and yes, I did mean the Peter Morris boxes.

I've also built some boxes that use the same CD and horn, but with a single 12" driver reflex, not horn loaded.
They sound awesome too...maybe a little clearer even than the PM 90/60. But they don't image quite as convincingly as the dipole mid PM boxes, where the dipole mid straddles the CD horn.
I've kinda come to the conclusion that imaging is mostly about acoustic co-lation. (Conclusion formed from the PM's and old electrostats I keep running.)

So anyway, just trying to find a way to keep growing...
For this project, the mids don't need to keep up with the CD...I feel I have that covered fine with the PMs and my own efforts.
I think what I really want are some 140 dB electrostats that play to 20 Hz 😀
Maybe synergy is the closest thing...
 
#6
I think one of the neat things about Unity horns is that you can get five drivers to play from 350hz to 20khz at a cost of around $150 per side.

If your compression drivers are *already* $600 per side I think it's less attractive. I know Danley uses coaxes in some of his own designs, but I think that's largely because he's trying to ramp up the SPL to very very high levels.
 
#7
Patrick Bateman said:
I think one of the neat things about Unity horns is that you can get five drivers to play from 350hz to 20khz at a cost of around $150 per side.

If your compression drivers are *already* $600 per side I think it's less attractive. I know Danley uses coaxes in some of his own designs, but I think that's largely because he's trying to ramp up the SPL to very very high levels.
Click to expand...

Patrick, what you say makes sense...
In fact, I've been thinking to maybe leave my existing boxes alone, no cannibalization, and start some budget synergies to cut teeth on...
You've certainly posted a number of good candidates.. thx!
 
#9
so, you're getting the CoSynes? Cool! Watch out when transporting them, as I recall the crossover boards aren't very well attached inside. And the back panels have been removed so many times that the screws have to be driven in at angles to catch stable wood!
 
#11
bwaslo said:
so, you're getting the CoSynes? Cool! Watch out when transporting them, as I recall the crossover boards aren't very well attached inside. And the back panels have been removed so many times that the screws have to be driven in at angles to catch stable wood!
Click to expand...

They're doing great! My measurements indicate that the two speakers are working great and matched.

In my room, one is about a decibel louder, but I believe that's because one is next to a window and the other isn't.
 
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