Well, damaging your existing amp is one way of having to get a better amp, but should you really be advising someone to take that kind of risk? Personally, I’d check with your amplifier manufacturer first before trying that. I’m not sure preamps and integrated amps are designed to be run at full output for sustained periods, however low the input signal. And there’s likely to a lot of additional noise. Passive preamps, such as Audio Innovations preamps and those from Music First might be a different matter.