multiple driver speaker

turk 182 · 26th October 2012, 07:52 PM

hi
after acquiring a pair of Bifrons hox 05 speakers i'm interested in trying to determine if these boxes are indeed original or at some time in their history they've been re/hacked.
the pair are identical in construction but are two different finishes.also one of boxes had a driver missing.after examining these a little more closely they appear to be an assembly of 9 4 inch full range drivers in a quasi bose scheme 8 drivers on wrinkled baffle and one driver on the back i'm trying to confirm that the box wiring is original it appears that both are wired in a series parallel scheme 8+8+8=24 24/3=8 final but follow a pattern determined by string (series) and position in the box also after a little
research it seems these where originally designed for PA use which leaves me wondering if they originally came with x-formers.

Pano · 26th October 2012, 07:55 PM

I think you tried to paste the image into your post, instead of the image URL. Can you point me to it so I can fix it?

turk 182 · 26th October 2012, 08:01 PM

sorry not sure what i did i didn't have any pic's ... oops.

turk 182 · 30th October 2012, 03:27 PM

hello...
is anybody out there?!!

help..please..

planet10 · 30th October 2012, 06:32 PM

We really need a picture to be able to evaluate. Daniel next door has a pair and has purposely removed one of the isophon edrivers (the 9th one on the back).

dave

turk 182 · 31st October 2012, 12:15 AM

ok planet 10
here's the speaker porn you requested
so ante up what kind of info/tech documents do you have on these

turk 182 · 31st October 2012, 12:17 AM

why did your neighbor remove a driver?

James Lehman · 12:41 AM

IIRC the Bose system that had nine drivers in it was wired with all in series and each speaker was 0.9 ohms.

0.9 x 9 = 8.1 ohms. Weird.

Check the DC resistance of all of the ones that are still wired and then isolate one driver and measure that.

A DC resistance will be lower than the nominal impedance, but not by a whole lot.

James.

turk 182 · 31st October 2012, 12:44 AM

they are indeed all 8 ohm drivers model HX125-8 made by Electroakusztikal Gyar (now b.e.a.g.)

planet10 · 31st October 2012, 01:30 AM

hmm... the one's i've seen all had isophon drivers.

dave

26th October 2012, 07:52 PM	#1
turk 182 diyAudio Member Join Date: Oct 2012	multiple driver speaker hi after acquiring a pair of Bifrons hox 05 speakers i'm interested in trying to determine if these boxes are indeed original or at some time in their history they've been re/hacked. the pair are identical in construction but are two different finishes.also one of boxes had a driver missing.after examining these a little more closely they appear to be an assembly of 9 4 inch full range drivers in a quasi bose scheme 8 drivers on wrinkled baffle and one driver on the back i'm trying to confirm that the box wiring is original it appears that both are wired in a series parallel scheme 8+8+8=24 24/3=8 final but follow a pattern determined by string (series) and position in the box also after a little research it seems these where originally designed for PA use which leaves me wondering if they originally came with x-formers.

30th October 2012, 06:32 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	We really need a picture to be able to evaluate. Daniel next door has a pair and has purposely removed one of the isophon edrivers (the 9th one on the back). dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

31st October 2012, 12:39 AM	#8
James Lehman diyAudio Member Join Date: Oct 2012 Location: Akron, Ohio USA	IIRC the Bose system that had nine drivers in it was wired with all in series and each speaker was 0.9 ohms. 0.9 x 9 = 8.1 ohms. Weird. Check the DC resistance of all of the ones that are still wired and then isolate one driver and measure that. A DC resistance will be lower than the nominal impedance, but not by a whole lot. James. Last edited by James Lehman; 31st October 2012 at 12:41 AM.

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26th October 2012, 07:55 PM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	I think you tried to paste the image into your post, instead of the image URL. Can you point me to it so I can fix it?

26th October 2012, 08:01 PM	#3
turk 182 diyAudio Member Join Date: Oct 2012	sorry not sure what i did i didn't have any pic's ... oops.

30th October 2012, 03:27 PM	#4
turk 182 diyAudio Member Join Date: Oct 2012	hello... is anybody out there?!! help..please..

31st October 2012, 12:17 AM	#7
turk 182 diyAudio Member Join Date: Oct 2012	why did your neighbor remove a driver?

31st October 2012, 12:44 AM	#9
turk 182 diyAudio Member Join Date: Oct 2012	they are indeed all 8 ohm drivers model HX125-8 made by Electroakusztikal Gyar (now b.e.a.g.)

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