unknown speaker help

dnic77 · 1st August 2012, 03:45 PM

hi, i won these drivers on ebay and there is no markings on them so i have no idea what they are i contacted the guy and he said this....

(They are an french imported clone of b&w cm4's and as such do not have a specific make.

A good bass/midrange driver.

I noticed they worked well in a 2 cubic foot enclosure, crossover at 5khz.

For use as a quality general purpose driver up to professional use.)

still not much for me to go off, ive searched google for hours with no luck! ive had a multi meter on them and they are 8ohms and measure 7"s total.

dnic77 · 1st August 2012, 05:33 PM

just spotted this on the back of them... 311tm

sreten · 1st August 2012, 10:50 PM

Hi,

They may be a clone of the CM4's 0.5 way driver, but expect a large
peak in the response typical of most metal coned bass/mid drivers.

Measurements and an elliptical crossover are usually needed,
see : Zaph|Audio It outlines the general approach.

rgds, sreten.

dnic77 · 1st August 2012, 11:05 PM

finally! thank you its a lead. They are a metal cone with a aluminium cone centre. Thank you again for your reply.

1st August 2012, 10:50 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, They may be a clone of the CM4's 0.5 way driver, but expect a large peak in the response typical of most metal coned bass/mid drivers. Measurements and an elliptical crossover are usually needed, see : Zaph\|Audio It outlines the general approach. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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1st August 2012, 05:33 PM	#2
dnic77 diyAudio Member Join Date: Jan 2010 Location: hartlepool	just spotted this on the back of them... 311tm

1st August 2012, 11:05 PM	#4
dnic77 diyAudio Member Join Date: Jan 2010 Location: hartlepool	finally! thank you its a lead. They are a metal cone with a aluminium cone centre. Thank you again for your reply.