Isophon P30/37/10 + DHB 6/2-10 drivers

Jamh · 18th January 2011, 04:14 AM

Has anyone done anything with these german drivers? I have them now in my possession and was thinking of doing something with them.

Some info:

Isophon P30/37/10: 40-8000 Hz, VA 12.5, resonance 45 Hz, 4 Ohm (from the excellent Isophon vintage site).

Isophon DHB 6/2/10 (a three driver into one): 2000-16000Hz, VA (2/12.5 not sure on my german here).

They were quite pricey for 1959 (a complete speaker around 600 DM / $150 US dollars in '59).

Jamh · 18th January 2011, 04:16 AM

Do they need a fieldcoil transformer?

Brett · 20th January 2011, 06:06 AM

Quote:

Originally Posted by Jamh

Do they need a fieldcoil transformer?

I have a set of these I was given some years ago. I stripped them out of the rubbish cabs they came in but they were working when I removed them by just cutting the internal cables and they needed no feild coil power; the magnets are alnico IIRC. The xover consisted of the cap you can see on the back of the MF/HF assembly. <- I never knew what the model number of it was before, so thanks, maybe I can find them a new home now.

planet10 · 20th January 2011, 08:11 AM

I too have some of those here -- and i have friends using a set in only the original fibreboard plug into a box enclosure (a scan of the accompanying manual). Brett is correct that they are AlNiCo.

I would call them quite musical but somewhat coloured.

dave

Steerpike · 20th January 2011, 10:34 AM

The technical documentation is here:
Isophon Archiv - Katalog Download

I think the "Fabrikations-Programm 1958" book will be the one you want.

Jamh · 20th January 2011, 01:37 PM

My plan is to make them powered. I'm thinking these might be a good match for a natural color as opposed to tubes:

15W pure sound Class A stereo amplifer PCB Hiraga

Another idea is to use 2 amps per cabinet, one for the lows and one for mid/highs. And who knows, maybe move the crossover to a htpc.. But I'll start simple.

Jamh · 20th January 2011, 05:20 PM

Quote:

Originally Posted by planet10

I too have some of those here -- and i have friends using a set in only the original fibreboard plug into a box enclosure (a scan of the accompanying manual). Brett is correct that they are AlNiCo.

I would call them quite musical but somewhat coloured.

dave

Thank you for this manual. BTW, the 12ftx12ft baffle! How funny! I guess the point is to stay away from sealed volumes.

20th January 2011, 08:11 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I too have some of those here -- and i have friends using a set in only the original fibreboard plug into a box enclosure (a scan of the accompanying manual). Brett is correct that they are AlNiCo. I would call them quite musical but somewhat coloured. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

20th January 2011, 10:34 AM	#5
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	The technical documentation is here: Isophon Archiv - Katalog Download I think the "Fabrikations-Programm 1958" book will be the one you want. __________________ Steerpike's Toybox

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18th January 2011, 04:16 AM	#2
Jamh diyAudio Member Join Date: Dec 2003 Location: sacramento	Do they need a fieldcoil transformer?

20th January 2011, 01:37 PM	#6
Jamh diyAudio Member Join Date: Dec 2003 Location: sacramento	My plan is to make them powered. I'm thinking these might be a good match for a natural color as opposed to tubes: 15W pure sound Class A stereo amplifer PCB Hiraga Another idea is to use 2 amps per cabinet, one for the lows and one for mid/highs. And who knows, maybe move the crossover to a htpc.. But I'll start simple.

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