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Author Topic: DIY Synergy/Unity spreadsheet  (Read 45683 times)

Offline petew

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Re: DIY Synergy/Unity spreadsheet
« Reply #60 on: August 15, 2012, 12:14:11 PM »
So, who are all the people reading this thread, anyway??  2500+ views


Another lurker.  Dying to build some for the back yard.

Offline mtg90

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Re: DIY Synergy/Unity spreadsheet
« Reply #61 on: August 15, 2012, 03:22:24 PM »
Another lurker.  Dying to build some for the back yard.
I can tell you firsthand they do excellent in back yards.  :)

Offline dB

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Re: DIY Synergy/Unity spreadsheet
« Reply #62 on: August 22, 2012, 12:07:00 PM »
Just ran into this thread, can't believe I'm 3-4 months behind it....  Awesome Bill!!  :) 
I've been looking at a unity system too, talking with Mike for some time on the subject.  Lil-Mike may end up fabbing his from steel plate.....
After having them around for a while - any additional comparisons / contrasts you can make against the better SEOS builds? 
I'm debating which direction to go for my own HT ...  12" SEOS/15" woofer, or - Synergy's?....... 
Either way they will be full active.

Offline maxmercy

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Re: DIY Synergy/Unity spreadsheet
« Reply #63 on: August 22, 2012, 07:11:54 PM »
Good to see you on here dB!


JSS

Offline bwaslo

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Re: DIY Synergy/Unity spreadsheet
« Reply #64 on: August 23, 2012, 07:01:39 AM »
Hi db.
Well, I haven't had the Seos15/TD15m set in place since the custom  Synergies ("coSynes") were done.  Though that is at least partly because my back went out and I can't move the big TD15 boxes by myself now.  I do think the  coSynes seem more integrated; thogh not by a lot.  Tom's synergy concept really does make it all sound like one driver.  Not like a driver, even, more like an emission from the air in that region.  The SEOS15 had a slightly different sound between the woofer and waveguide, not at all bad, but not like one driver.  Some of that effect is likely psychological, it is odd with a synergy that everywhere the sound character is the same no matter how close you are to them.  Of course the fact that the coSynes are 24" horns with about an octave lower directivity control doesn't hurt, either.  Very easy to listen to, no mental confusion at all from split up sound sources.

I now have the coSynes playing with the subs (sealed servoed diy jobs).  That did improve their sound, they go to 37 hz on their own, but not as solidly as the subs. 

I'll probably sell the SEOS15/TD15 speakers if only because they are too heavy for me and also my wife likes the plain oak coSyne cabinets better than the more wild-looking rosewood veneer SEOS/TD cabinets.
« Last Edit: August 23, 2012, 10:04:10 AM by bwaslo »

Offline maxmercy

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Re: DIY Synergy/Unity spreadsheet
« Reply #65 on: August 24, 2012, 06:00:47 AM »
I'll probably sell the SEOS15/TD15 speakers


Wow, that's a pretty strong synergy endorsement there......but I do understand about the weight issue.


JSS

Offline bwaslo

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Re: DIY Synergy/Unity spreadsheet
« Reply #66 on: August 24, 2012, 07:24:22 AM »
Well, it's nothing against the SEOS or TD15, that's for sure.  That combo will play louder than the Synergy I made (the drivers I used are buyouts and aren't pro style).  And the SEOS's response is a little smoother and more consistent with angle at higher frequencies.  I'd li ke to hear a Synergy done in a 24 inch SEOS (thogh I think the irregularities come from the side holes in Synergy; so SEOSing wouldn't help that)

Offline bwaslo

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Re: DIY Synergy/Unity spreadsheet
« Reply #67 on: September 14, 2012, 08:27:40 AM »
Had a question about how humongous these were in a room.  Here's a shot of the room (during some measurement, and shelves recently emptied of DVDs by my daughter).  Not really too bad.  The TV is a 37"



Offline Face

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Re: DIY Synergy/Unity spreadsheet
« Reply #68 on: September 15, 2012, 06:12:18 AM »
Very nice build.  Too bad there won't be an available flat pack due to patents...

Offline tomlang

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Re: DIY Synergy/Unity spreadsheet
« Reply #69 on: September 15, 2012, 07:28:14 AM »
I'm one of the 2500 and plan to build this some day.  In the meantime, I have figured out a way to cut compound angles on my 3 axis Shopbot CNC.  Take a look at this stove hood, no less complex than the synergy horn.  The table saw was not touched to make this hood.


I will start with a Google Sketchup of the horn and go from there.  Once the Sketchup of this hood fit perfectly, so did the cut out pieces.


Has anyone made a Sketchup model of a Synergy horn?
« Last Edit: September 15, 2012, 07:36:46 AM by tomlang »

Offline bwaslo

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Re: DIY Synergy/Unity spreadsheet
« Reply #70 on: September 16, 2012, 09:07:32 AM »
Tom, I don't think anyone has.  But if you make the files, could you please post them here?

Also, anyone who plans to make these may want to get the 2" midrange drivers while they can, I know Parts Express didn't have a huge quantity of those in stock (but I think Marlin P Jones has some also).  Suprisingly, I haven't found any drivers for this particular design and size horn that seem like they'd work any better than these buyouts, both the 2" and the 6".  Can't beat the price!
« Last Edit: September 16, 2012, 09:10:20 AM by bwaslo »

Offline bwaslo

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Now... Linear Phase
« Reply #71 on: September 16, 2012, 04:03:28 PM »
With some suggestions from Tom Danley himself, I put together a passive crossover circuit to approach linear phase response for the coSyne design.  It works pretty well, not perfectly linear phase of course but a lot closer than nearly all speakers.  Response isn't quite as smooth as with the last crossover, but I don't think the difference is enough to worry about.  A plus is the crossover circuit is simpler and less lossy than the old one.
Here is a shot of the frequency and phase response, 1/6th octave smoothed:

And for those who think 1/6th octave smoothing is cheating, here is the unsmoothed (the delay plane is a bit misadusted on this shot):


The phase rise at low frequencies is because the bass design is ported, so will be approaching 180degrees phase at the port frequency (i.e., not linear phase in the bass, but with room reflections, nothing really is).

Here is the impulse response:


Not perfect. but pretty darned tight.  I haven't checked to see what it does to square wave shapes yet.

And here is the crossover circuit:


Drivers are the same as before (buyout mids and woofers, Celestion CD driver.

I built it on a piece of 1/4" plywood, twisted component leads together and soldered them, then hot-glued each to the board.  Very quick and easy if you are used to soldering.  Here's a photo:


And here it is mounted into the cabinet (you can see all my messy wiring.. no magic cables for this guy!).


I sent the driver measurement files to Tom Danley, and he was kind enough to do a design (in the same day) for an active crossover for this speaker including EQ!  The active crossover hardware I have (miniDSP) doesn't have build in sections for high order Bessel filters as Tom specified, though, so I will need to do some research on how to implement those using biquad sections in MiniDSP.  Or else get a different DSP crossover system to try it with.

Hope this helps any builders out there.
 

-Bill
« Last Edit: September 16, 2012, 04:32:27 PM by bwaslo »

Offline mtg90

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Re: DIY Synergy/Unity spreadsheet
« Reply #72 on: September 16, 2012, 04:49:30 PM »
Very nice. I wish my phase looked like that.

Offline Kagey

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Re: DIY Synergy/Unity spreadsheet
« Reply #73 on: September 16, 2012, 05:11:35 PM »
Looks good Bill!

Offline tomlang

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Re: DIY Synergy/Unity spreadsheet
« Reply #74 on: September 16, 2012, 06:35:02 PM »