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The term "balanced differential" isnt really correct.
The head unit uses a bridge tied load configuration.
This means for each output channel, there are two amplifier chips. One drives the positive wire like normal, the other drives the negative wire with an inverted signal. They do this becuase it means you can use a single 12v PSU and get a decent output power.
This poses an issue for some amplifiers, as many amps assume RCA ground and Chassis ground are the same thing, and connect them together internally. If you connect the output from the head unit to such an amp, you short out the amplifier driving the negative leg, and the amp shuts down.
Many amps however dont tie the RCA ground to chassis ground. Any of these will work fine. Just check with a multimeter between the RCA shells, and make sure they're not connected together, and also check between RCA ground and the ground power terminal on the amp. If they are all high resistance, you're good to go.
However even if your amp does connect the RCA's together, all you need to do is only connect the + to the RCA, and connect the shell of the RCA to chassis ground.. Each amplifier in the head unit is already referenced to chassis ground, so it should all work fine. You might get ground loop issues, but worth a try if its an amp you've already got etc.
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