Altec A7 Refurbishment

[gearfreak]

Do they run a separate amp directly to the woofer as is or...

For 2 way stereo with selectable Xo freq and indep. channel levels, Altec 9442/4 A or SA amps, with Altec or EV Octal plug-in modules could be used.

e.g.



2x 9442/4 + 2x EV APX Octal crossovers

or

1x 9442/4 + 2x EV APX2 Octal crossovers + your HF amp


APX/APX2 selectable frequencies in your ballpark:
...
0500 hz
0630 hz
0800 hz
1000 hz
1250 hz
1600 hz
2000 hz
2500 hz
3150 hz
...


or subbing EV CX-1 (CX1) for APX2, :
0500 hz
0800 hz
('or user determined values')


AMCX1 appears to be the same thing, but YMMV.
See also Altec 15581A if you like.


Of course there's many ways to go 'active', but the Altec + Octal solution is flexible enough, and keeps it simple IMO.

Caveat Emptor wiring your drivers up directly, reading up on HF channel bypass caps etc. is prudent. I don't use them atm.