I am planning to use my AMP6-Basic as a stereo guitar amp and have been told to prevent the inputs from going above 5V to avoid damaging the tripath chip. I'm a bit of a novice at this so my question may be a bit obvious... Can I simply put a reversed zener diode (say a 4.7V 1W) between each input channel and the ground plane? In my simplistic view of things the diode would block the short to ground until the zener voltage is reached (4.7V in this case) Once this voltage is reached the diode would short the signal to ground preventing a high voltage spike from reaching the input(s) of the power amp.
Is this a suitable solution? Should I place a resistor between the diode and ground to mimic the input impedance of the AMP6 and avoid shorting preamp?
If it helps, the preamp I plan to use is this circuit: http://www.runoffgroove.com/professor.html
I will simply build a two-channel version and use a 9V regulator to drop the 12V supply I already have for the AMP6.
Any advice is greatly appreciated.