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Multi-Way Conventional loudspeakers with crossovers

Modding the Yorkville Unity
Modding the Yorkville Unity
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Old 9th October 2009, 02:38 PM   #1
jdubs is offline jdubs  United States
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Default Modding the Yorkville Unity

Hey guys

I am a big fan of these speakers and have been using them for about a year. I really want to make better use of my DEQX and actively triamp the Unitys. I've tried to get more info from the folks at Yorkville but to no avail. The published specs on the Yorkville webpage list a 1250hz crossover for the tweeter (BMS 4550) to the three midrange drivers (Celestion 5"ers) and 300hz to the woofer.

Any ideas on what I should try? I was thinking of first using the crossover figures with steeper slopes. The BMS is a good driver, but I wonder if an upgrade to the Celestions might help. I'm not sure what the woofer is.

I pulled the horn section off last night and, wow, talk about a complicated crossover network!

Thanks guys for any ideas.

-Jim
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Old 9th October 2009, 04:21 PM   #2
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by jdubs View Post
Hey guys

I am a big fan of these speakers and have been using them for about a year. I really want to make better use of my DEQX and actively triamp the Unitys. I've tried to get more info from the folks at Yorkville but to no avail. The published specs on the Yorkville webpage list a 1250hz crossover for the tweeter (BMS 4550) to the three midrange drivers (Celestion 5"ers) and 300hz to the woofer.

Any ideas on what I should try? I was thinking of first using the crossover figures with steeper slopes. The BMS is a good driver, but I wonder if an upgrade to the Celestions might help. I'm not sure what the woofer is.

I pulled the horn section off last night and, wow, talk about a complicated crossover network!
Oh sh t, Danley is using Celestion for the midranges?

I had no idea what driver that was. I wound up buying a case of woofers based on the comments he made here:

http://www.diyaudio.com/forums/showthread.php?p=1670643

If you want my .02 on how to improve a Unity horn, check out some of the posts I've made over the past few years. I've built three clones now, and I'm running them in my daily driver as we speak.
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Old 11th October 2009, 07:33 PM   #3
musical noise is offline musical noise  Switzerland
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Well just thinking out loud... you could perhaps use Soundeasy to measure/calculate the crossover's transfer function and then digitally emulate these slopes by using Soundeasy to program a Behringer DCX2496. That off course requires that you have fairly good knowledge of the use of the software which by most accounts has a steep learning curve.

Last edited by musical noise; 11th October 2009 at 07:36 PM.
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Old 11th October 2009, 08:07 PM   #4
planet10 is offline planet10  Canada
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Modding the Yorkville Unity
I put 4 of these into a Big House in Alert Bay. http://www.yorkville.com/default.asp?p_id=127

The designer was very open to the idea of helping to convert to active (both Jesse & i put a set of these on a long queue for hifi possibilities). I'd contact him.

dave
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Old 11th October 2009, 09:40 PM   #5
catapult is offline catapult
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On another forum, dwk stuffed his horn with reticulated foam ala Geddes. I've also heard of plugging the port and stuffing the box with fiberglass to help kill a cavity resonance. That would kill some LF too so you'd either need a sub or need to boost the LF with the DEQX.
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Old 12th October 2009, 01:43 AM   #6
JoshK is offline JoshK  Canada
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Quote:
Originally Posted by jdubs View Post
Hey guys

I am a big fan of these speakers and have been using them for about a year. I really want to make better use of my DEQX and actively triamp the Unitys. I've tried to get more info from the folks at Yorkville but to no avail. The published specs on the Yorkville webpage list a 1250hz crossover for the tweeter (BMS 4550) to the three midrange drivers (Celestion 5"ers) and 300hz to the woofer.

Any ideas on what I should try? I was thinking of first using the crossover figures with steeper slopes. The BMS is a good driver, but I wonder if an upgrade to the Celestions might help. I'm not sure what the woofer is.

I pulled the horn section off last night and, wow, talk about a complicated crossover network!

Thanks guys for any ideas.

-Jim
Are the mid and treble crossovers, parrallel crossovers? If so I'd think you'd be able to measure the response of each network/driver combo individually and that would give the resulting target functions.

If I can help in anyway, Jim, let me know.

Josh
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Old 12th October 2009, 07:22 PM   #7
rlsound is offline rlsound  Canada
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Would it be possible to fit a T.A.D 4001 onto the Unity horn?
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Old 13th October 2009, 02:18 AM   #8
JLH is offline JLH  United States
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Originally Posted by Patrick Bateman View Post


Oh sh t, Danley is using Celestion for the midranges?

I had no idea what driver that was. I wound up buying a case of woofers based on the comments he made here:

Another Unity Horn - Page 22 - diyAudio

If you want my .02 on how to improve a Unity horn, check out some of the posts I've made over the past few years. I've built three clones now, and I'm running them in my daily driver as we speak.
Patrick,

I've done a lot of poking around and had many doors slammed in my face. However, I believe I know the exact drivers that Danley is now using. Download the below Celestion catalog and go to page 68 and 69.

http://professional.celestion.com/pr...ECATALOGUE.pdf

The 5" that is being used is the Celestion TF0510MR. The 4" that is being used is the Celestion TF0410MR. I tried to get more detailed T/S parameters, but Celestion refused. Let me tell you, the people at Celestion were real sweethearts, NOT!.

The Misco 5" is just fine. No worries. Any high eff sealed midrange works just fine for Unity clones. You just end up with a slightly different crossover to get everything correct.

Rgs, JLH
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Old 13th October 2009, 02:27 AM   #9
JLH is offline JLH  United States
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Originally Posted by rlsound View Post
Would it be possible to fit a T.A.D 4001 onto the Unity horn?
That's about the last thing you would want to do to a Unity horn. First, the Unity uses a 1" compression driver so a TD-4001 will not fit. Second, larger format drivers begin to have pattern control problems lower in the high frequencies than 1" compression drivers. That is why Tom chose a 1" compression driver for the Unity.

Rgs, JLH
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Old 13th October 2009, 02:34 AM   #10
JLH is offline JLH  United States
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Originally Posted by jdubs View Post
Hey guys

I pulled the horn section off last night and, wow, talk about a complicated crossover network!

Thanks guys for any ideas.

-Jim
A good start to get more people to help is to trace out the current crossover and post it. We can then model it and give more input on how to use the DEQX. The key factor with the Unity crossover is the natural delay caused by the passive lowpass filter. You have to get it phase coherent, otherwise you will have problems.

Rgs, JLH
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