The 7700 has balanced inputs, while the 7200 does not.

The major difference between the two amps is that the 7200 has only unbalanced (RCA) inputs. The 7700 has both unbalanced and balanced (XLR) input connections. The input type on the 7700 (and 7500) may be selected per channel, running a mix of RCA and XLR cables as required. Balanced cable design offers superior immunity to noise/hum pickup in the cabling and/or due to ground loop interactions.

Actually, the differences go well beyond the types of cables that can be used.

The Model 7700 utilizes a fully differential design topology whereas the Model 7200 is a single-ended design.

A differential amplifier is sort of like having two amps per channel working with each other to control driver movement. The result of this is an amp design that is capable of a rise time that is twice as fast as a single ended amplifier.

Best,

Scott

Thanks, Scott.

I looked through the 7200 documentation before replying but couldn't find that info.

Other benefits of differential include a lower power supply rail voltage for a given output power and the ability to pull from both plus and minus power supply reserves for transient peaks.

I have my onkyo 805 12v trigger hooked up to zone 2(which i do not use)for triggering my 7500 on.i have my harmony 880 turn zone 2 on and off as if it were the amp itself.I dont know if this helps you or not,its just another idea.I like outlaw customer service good quality product,the 7500 is anyways i dont know about any other products and ITS MADE IN THE USA!!!right down the street in easton ma.

The 7500 is put together in southern California by ATI and the domestic part count in all likelyhood does not qualify it as being Made In the USA (have to be 98% domestically manufactured parts to get that stamp, which is just about impossible these days for electronics).

Outlaw's offices are in Massachusetts, hence the "Easton MA" on the back panel. All of their multichannel amps are built by ATI (the 7500, 7700, 7200, 7125, and 7075) in California and I believe are all shipped from California.