MCM Aluminum Cone Subwoofers

MCM Electronics (800.543.4330) recently put a couple of great looking aluminum cone drivers on clearance.  Here are the specifications given in their flyer:
 
Part #
Size
Power
RMS/Pk
SPL
1W/1m
Qts
Vas
(l)
Fs
(Hz)
Xmax
(mm)
Reg
Price
Sale
Price
55-1920
10"
60/100
86.2dB
0.64
  52.86
33.3
14 
$79.95
$19.95 
55-1925
12"
70/120
86.8dB
0.67
107.33
28.2
14 1
$89.95
$29.95 2

1 Michael Sims kindly provided the DUMAX results of 9.5mm--not quite as remarkable as specified, but very respectable for the price.
2 Price as reported in sales flyer.  Upon calling to order, the purchase price was $22.95 ... sweeeet!  Use sales code AF1299 to receive the clearance pricing.

Note that the Qts figure is rather high, suggesting these drivers would be best suited to a large sealed or aperiodic enclosure or perhaps an infinite baffle.  If MCM still has some of these drivers in stock, it looks like a perfect candidate for an impressive dipole array.  Using the published parameters, a sealed Butterworth alignment (Q=0.707) requires an enclosure volume of approximately 6ft3 (175 liters) assuming 100% fibrous fill.  A bit large for my tastes.  However, a 3ft3 (85 liter) box yields a Qtc of 0.8 with only 0.2dB of peaking, not to mention a much more manageable enclosure.  Enclosure tuning comes in at 40Hz and provides an F3 of 36Hz.  Couple moderate room gain with the shallow rolloff below the tuning frequency and this driver begins to look like a real contender for low bass on a budget.  Certainly not bad for one Andrew Jackson and some change.  Hmmm, I have some unused ScanSpeak flow resist vents that need a good home...

I ordered six of the 12" model the very day I received their sales flyer.  I had almost purchased a pair of them a few weeks ago when they were advertising them for $39.95.  Glad I waited!

Click on the thumbnails for a full size image.

Pretty intimidating looking drivers with a touch of elegance.  Heavy aluminum cone and dust cap, rubber surround, cast frame, 2" high stacked magnet assembly, vented pole piece, and gold plated binding post terminals.

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Revised:  December 20, 1999
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