Comparing two old MCM woofers

diydave · 24th May 2008, 02:16 AM

I have a bunch of old drivers that I bought a while back. At the time I thought I was buying the shielded and unshielded versions of the same driver, but according the published specs they're more different that I thought. e.g. Fs and Zo are quite different.

These are the 2 drivers:

http://www3.telus.net/~coquet/mcm/55-1855.pdf

http://www3.telus.net/~coquet/mcm/55-1870.pdf

Sorry for the PDF's, but the text isn't copy and paste-able.

If I read the specs right (and if they're even close to accurate), the 55-1855 will have slightly better bass extension, but for the most part they should perform very similarly below 2 KHz.

I don't have a jig (or skills) to measure them so I'm hoping that someone could just have a quick look at the pdf's and give me a SWAG.

peanut123 · 27th August 2008, 05:40 AM

Looking at the sheets...you seem to be right

24th May 2008, 02:16 AM	#1
diydave diyAudio Member Join Date: Jul 2005 Location: canada	Comparing two old MCM woofers I have a bunch of old drivers that I bought a while back. At the time I thought I was buying the shielded and unshielded versions of the same driver, but according the published specs they're more different that I thought. e.g. Fs and Zo are quite different. These are the 2 drivers: http://www3.telus.net/~coquet/mcm/55-1855.pdf http://www3.telus.net/~coquet/mcm/55-1870.pdf Sorry for the PDF's, but the text isn't copy and paste-able. If I read the specs right (and if they're even close to accurate), the 55-1855 will have slightly better bass extension, but for the most part they should perform very similarly below 2 KHz. I don't have a jig (or skills) to measure them so I'm hoping that someone could just have a quick look at the pdf's and give me a SWAG.

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27th August 2008, 05:40 AM	#2
peanut123 diyAudio Member Join Date: Aug 2008	Looking at the sheets...you seem to be right

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