passive suround with the T amp?

[locke]

hey, im building a cheap car audio system with a pair of t amps, and im wondering whether its possible to build a passive suround system with a t amp without burning it out. i made a passive suround with this schematic a few years ago and it sounded pretty good.

i did burn one amp out this way tho, so i want to know if the t amp will also fry on this kind of circuit. i think my previous amp's burning was a result of the grounds for right and left being connected. so i wanted to know if this can happen with the t amp as well.

 

[cpemma]

Speaker "negatives" on any bridged amp (including the T-amps) are different on L & R channels... never link them or join to 0V ground.

I think at idle both speaker terminals are at +6V (on a 12V supply) but the 2 cancel out without the need for the DC-blocking capacitor usual on a single-supply amplifier. Add a signal and one terminal of the bridge goes up as the other (inverted) terminal goes down; flowing through a speaker the current makes music, flowing through a link to the other channel with a slightly different stereo signal, just lots of heat.

 

[locke]

hmmm, so just as i suspected, that sort of a circuit will not work with the left and right channels of a t amp...

what if i use seperate t amps as the right and left amps? (on the same power supply) will this still work?

 

[Eva]

Connect Lr between L and R positive terminals and Rr between L and R negative terminals (or vice-versa). That's the closest approach.

 

[locke]

thanks! ill give that a try right now. luckily these t amps seem to shut down when they overheat instead of burning out so i can experiment without fear.