New-Used amp - how to bridge

[Cpus456]

Hey Folks,

Just picked up my 3rd Carver; a Carver AV 64 Cathedral amp

Im been searching for information for a while with this one and cant seem to find a manual anywhere.

I bought the unit as hit has the ability to bridge channels 1 and 2 to output 180watts to one speaker (center channel)

It has a Derived Center channel, that works when i have one rca in either channel 3 or 4. if i put and into both channels the sound coming from the channel gets muffled.

The details below say that channel 1/2 have to be bridge to get 180watts.

The issue is that unlike my other two (TFM 55x and TFM 15cb) this one doesnt have the "guide for bridging" printed on the back

Snapshot of Spec page:


Heres an image of the rear


Any help will be great