Converting Carver Sunfire True Sub..

Sm88

Member
2010-10-23 1:35 am
I have a Sunfire True Sub Super Junior which unfortunately has a blown amplifier, the internal fuse blew but it looks as if there is significant burn damage to the components (one resistor is essentially melted, big char area as well).

Contacted Carver about repair and it would run upwards of $400 if even possible, which is roughly what the thing is worth in working condition. What I would like to do instead of reattach the amp panel (to create a seal) but convert it to passive.

I'm not entirely sure, but would this be correct:
Disconnect everything in the amp
Wire the driver leads to one of the sets of binding posts directly
Obtain a crossover with volume control (Paradigm X30 perhaps) and connect between preamp and external amplifier. (Or do I need this if my processor can crossover?)

Any ideas would be appreciated, i'm mostly playing around with the idea for right now. Thanks!
 

Sm88

Member
2010-10-23 1:35 am
Thanks, didn't consider that. I'm not going to risk my McIntosh on it. But I just so happen to have a broken Nakamichi PA5 which is a Nelson Pass Stasis amp, only one channel is working, which might be perfect. I know it is a very well built amp, but would you happen to know if it is stable to low impedances?
 
I believe it uses Carvers tracking down converter to improve amplifier efficiency. You'll need about 1000 watts to get the same volume out of it.

You'd be better off trying to fix it if you can. I don't believe that the amplifier is isolated from the mains connection either so be careful.
 

Sm88

Member
2010-10-23 1:35 am
As far as I am aware the tracking down converter is essentially Carver's term for Class D (or close enough). From what I understand, the amp in the Sunfire is 100w RMS, peaks don't count. Also the person at the carver shop I wrote mentioned the driver should measure between 3.6 and 4.3 ohms impedance or something along those lines. The lack of isolation might be worry-some.