biflex ( 420 a) in 10 cft

[MERDY]

just because i had these things sitting in the attic and wifes closet i put them together in the old jbl 10 cft boxes sealed the ports with a staple gun added the 2 420 a with a emilar e175 driver in a small seirra brooks horn crossed at 800 hz
it was a fairly likeble altec sound, i dont know why folks dont like this driver,the bass notes were awesome on some old regge and dub
i will trry some higher slopes next week

[RonSSS]

I like the 420's. I bought a pair of Santana's with the 420-8B in them and they are nice sounding!
Also tried the 420-8B woofs in my model 19's with good results.
I think they could be built into a just fine 2 way system with a horn.
I always keep my eyes open for another pair of these.
The -8B version can be front or rear mounted and have what appears to be the same magnet structure as a 416-8B.

Ron

[zelgall]

I measured four 420's last weekend. These is a typical result on a Woofer tester2. Some of the numbers look a bit off but I still think the 420's are nice.


Vas test completed: Sun Nov 18 21:18:11 2007
Vas drive current 3181.82 uA
;------------------------------------------------------------------
Revc = 4.6496 ohms
Fs = 26.8365 Hz
Zmax = 24.4666 ohms
Qes = 0.7421
Qms = 3.1628
Qts = 0.6011
Le = 0.4352 mH (at 1 kHz)
Diam = 330.2000 mm ( 13.0000 in )
ConeArea =85633.5536 mm^2(132.7323 in^2)
Vas = 571.1163 L ( 20.1688 ft^3)
BL = 8.1860 N/A
Mms = 63.4268 g
Cms = 554.5190 uM/N
Kms = 1803.3645 N/M
Rms = 3.3814 R mechanical
Efficiency = 1.4339 %
Sensitivity= 93.5652 dB @1W/1m
Sensitivity= 95.9219 dB @2.83Vrms/1m