Can you recommend someone who can come up with a crossover design?

audiojerry · « **on:** 10 Dec 2006, 07:42 pm »

A couple of years back I acquired a set of 4 German Isophon P170 6" midbass drivers. I think I found them on Ebay when someone was liquidating a large batch of raw Isophon speakers, which I guess were discontinued.

I was able to obtain the Thiel small parameters from the Thiel website, which is a terrific place for anyone needing to look up driver data. The data for the Isophon seems to be very good: http://www.thielesmall.com/include/details.asp?ID=725&dtype=1

I would like to build a closed box, monitor sized, speaker for 2 of the drivers, and I'd like to acquire the optimal tweeter and crossover components to mate with the Isophon.

Looking for recommendations.
Thanks for your help!

Marbles · « **Reply #1 on:** 10 Dec 2006, 07:59 pm »

I would contact Dennis Murphy first, you could also post this question on the Madisound forums.

audiojerry · « **Reply #2 on:** 10 Dec 2006, 08:03 pm »

Thanks Marbles,
I remember reading all kinds of positive things about him.
I know he is a designer. Do you know how to reach him?

gitarretyp · « **Reply #3 on:** 10 Dec 2006, 08:04 pm »

Some of the people on HTGuide's Mission Possible forum may be able to help.

MaxCast · « **Reply #4 on:** 11 Dec 2006, 02:19 am »

Quote from: audiojerry on 10 Dec 2006, 08:03 pm

Thanks Marbles,
I remember reading all kinds of positive things about him.
I know he is a designer. Do you know how to reach him?

http://murphyblaster.com/content.php?f=main.html

MarkM · « **Reply #5 on:** 11 Dec 2006, 03:08 am »

Another option is Rick Craig from Selah Audio. Rick does custom designs for very reasonable $$. To get the most out of the design, it is best to test the individual drivers to get the accurate T/S measurements and have the drivers mounted in the cabinet to measure the speaker when the xo is complete.

Madisound & Parts Express have some nice cabinets, worth checking out if you don't have all the tools needed to roll your own.

audiojerry · « **Reply #6 on:** 11 Dec 2006, 03:17 am »

Thanks for the advice and help to each of you.
I can't build the enclosure until the correct cabinet volume is calculated, right?

Imperial · « **Reply #7 on:** 11 Dec 2006, 03:28 am »

Rick Craig seems a good choice.
David Ellis also.

Imperial

Brad · « **Reply #8 on:** 11 Dec 2006, 03:32 am »

Don't forget the busy Danny Richie....

the previously mentioned guys are all very good too

Midnite Mick · « **Reply #9 on:** 11 Dec 2006, 04:04 am »

You might want to discuss this here http://www.diyaudio.com/

Alot of good people there that include some of the people here.

Good luck,
Mike

MarkM · « **Reply #10 on:** 11 Dec 2006, 12:39 pm »

Quote from: audiojerry on 11 Dec 2006, 03:17 am

Thanks for the advice and help to each of you.
I can't build the enclosure until the correct cabinet volume is calculated, right?

Correct, since you have 4 drivers, you are looking at an MTM possibility?

JoshK · « **Reply #11 on:** 11 Dec 2006, 02:54 pm »

My guess is you are not going to get a lot of bass out of them in a sealed monitor sized box. You may need to supplement them with a sub depending on how much bass you like. Rick Craig or Dennis Murphy are your best bets I'd imagine.

audiojerry · « **Reply #12 on:** 12 Dec 2006, 04:35 am »

I have emailed Dennis Murphy.
I considered contacting Danny at GR, but I thought he might be too busy with other things.
I plan on using only 2 of the 4 drivers, and if I like the results, I'll consider building speakers with the other 2.
I do plan on a powered sub crossing over at around 70hz.

Thanks again to everyone.

OTL · « **Reply #13 on:** 12 Dec 2006, 06:30 am »

Sure...after a coupla drinks nothing electronical can challenge me. me.

Just PM me and sure your including your cheking account number from which you'll supply your first deposit towards my pinikel design.

Let's set the world on fire with our collaburation....your money and my electronikal expertise will set the world on fire and bring us un told rewads.

Dont' waste, kontact me as soon as you know how.

Looking forward to our everlasting partnership...

Foureva with locked forearmes,

Mika

audiojerry · « **Reply #14 on:** 12 Dec 2006, 06:11 pm »

Quote from: OTL on 12 Dec 2006, 06:30 am

Sure...after a coupla drinks nothing electronical can challenge me. me.

Just PM me and sure your including your cheking account number from which you'll supply your first deposit towards my pinikel design.

Let's set the world on fire with our collaburation....your money and my electronikal expertise will set the world on fire and bring us un told rewads.

Dont' waste, kontact me as soon as you know how.

Looking forward to our everlasting partnership...

Foureva with locked forearmes,

Mika

??????????????????????????????????????????????????????????????

Daygloworange · « **Reply #15 on:** 12 Dec 2006, 06:25 pm »

Quote

Sure...after a coupla drinks nothing electronical can challenge me. me.

Oh, ok, I get it now. OTL stands for over the legal limit .

Cheers

NewBuyer · « **Reply #16 on:** 13 Dec 2006, 05:41 am »

Just wanted to mention that Albert at Space Tech Labs also does crossover design.
About halfway down this web page you can see a picture of a nice pair of 3-ways he built...

Rob Babcock · « **Reply #17 on:** 13 Dec 2006, 10:16 am »

I have a pair of speakers that Rick Craig created crossovers for, and they certainly perform all out of proportion to their cost. I'd conversed via e-mail with him about custom work (not sure if he'll remember, it was some time back) and I was very impressed by his ideas. And his quotes were very, very reasonable.

audiojerry · « **Reply #18 on:** 13 Dec 2006, 07:15 pm »

I am really appreciating all the help.
Dennis Murphy has responded to my inquiry, and he too has offered some very friendly advice.
With your help, I now have several options to explore.

Thanks again to all!