A:Answer I am assuming you want the subwoofer as the final amp so you can get those lows. But regardless, it is NEVER a good, fair, or bad idea to put two amps back to back. It is a terrible idea at best and a dangerous idea at worst. Amplifiers are designed to take a low input signal and increase it to higher output for speakers etc. First of this is that it is quite likely that the output impedance of your amp is very different from the input impedance of the other amp no matter which way you hook them up. This generally leads to poor quality signals (that means it will sound bad). Secondly, even if you send amp 1 output at a low level it will likely overdrive the input in amp 2 and if you are unlucky, you could blow some component in the input of amp 2, even if your amp 2 has a limiter, and you drive it too hard with a high-level signal for a long time you could overheat components that could pose a fire hazard. So it seems your best options would be- 1. add a special subwoofer driver to this amp, there are some jacks that have a suitable output level to do this, or 2. replace your existing subwoofer amp with a more powerful one.
