Anyone tried the MCM 21" cast woofer yet? - diyAudio
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Old 24th January 2012, 03:16 AM   #1
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Default Anyone tried the MCM 21" cast woofer yet?

I keep eyeing the MCM 21" cast woofer. The specs look tempting. Interesting, though when I enter the data into WinISD, the curve is identical to the 55-2984 cast 18 woofer. with a xmax of 7mm and a vas of 705 litres, I expected a different result. Any input
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Old 24th January 2012, 03:52 AM   #2
NEO Dan is offline NEO Dan  United States
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I have tested several other MCM drivers and with the exception of the 55-2421 they were all quite a bit off. Generally speaking the motor force is quite low causing a major problem with Q values and sensitivity. You get what you pay for.
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Old 2nd February 2012, 08:59 PM   #3
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Greetings kegent01. I eyed this thing as well. That's why I'm in the closing stages of building a tapped horn for mine. nothing fancy, just wanted to try it. Should be ready to test by Wednesday. I'll keep you posted.
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Old 2nd February 2012, 09:02 PM   #4
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Thanks. I am currently building an 18" version Bass cab
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Old 2nd February 2012, 09:37 PM   #5
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Try the 18sound 21lw1400. It's 360 I believe from

After using the 18lw2400 in my TH-18's id love to try out a cabinet designed around the 21 incher!!

Last edited by m R g S r; 2nd February 2012 at 09:40 PM.
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Old 9th June 2013, 12:41 AM   #6
BHTX is offline BHTX  United States
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Has anyone measured T-S parameters for the MCM 21 yet? I'm curious to know just how off the values are. With only a 100oz magnet, I wouldn't be surprised if Qts was even higher than the Pyle PDW21250 21" with its 250oz magnet, which seems to average about 0.7 Qts from what I've seen (I know motor size doesn't dictate stength, I'm just throwing this out there). So, has anyone measured their MCM 21's T-S params?
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