info on old school RF crossover cards

[bobgrey]

I've been searching the internet for this, but since Rockford Fosgate calls their new model the same exact thing as the old model its frustrating and difficult to find information on older models.. maybe someone can point me in the right direction.

I've found this old school RF punch 400.4, for free. I don't know what it was used for last, but I intend to try to bridge it and run some 100w rms 6.5''s with it. So the crossover on this amp is not a knob, but a card or cartridge accessed through a hole in the bottom of the amp. Actually 4 cards. 1 - front, 2 - rear, 1 - throughput. Each card can be flipped upside down and has an arrow for HP or LP depending on which way you insert it. My initial impulse is to put the HP arrow pointing towards the board to run my speakers (which is the opposite of how they are now). What I'm hoping to know is what the crossover points or slopes might be, and if I can remove the card for the throughput, which I assume modifies the signal on the RCA line out?

I know I can just hook it up and change it around to see what happens, but I've never dealt with something like this before and would like to know more about it before I do that. Most used stuff I can find the manual online somewhere, but there is so much punch 400.4 information that is not this amplifier.

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[Rich B 5,000+ posts]

Using the XCard crossover

Hope that helps, but I have no idea where you could find an XCard, even a blank one.

 

[audiobaun 5,000+ posts]

Using the XCard crossover
Hope that helps, but I have no idea where you could find an XCard, even a blank one.

A hit and miss on E-bay..Hard to find at times/deff becoming quite rare