Ok, What determins if an amp can handle the lo-B frequencies of a 5-string? Is it the power head wattage? The Amp design itself? The speaker wattage and/or frequency range?? I have an older Peavy TNT 160 watt bass AMP I use for practise, and the clip light keeps on flashing, and it sounds distorted even when at lo to med volumes. If I upgrade the 15" speaker will it help? (The TNT is fine with a 4-string). I'm kinda new at the 5-string (which is an active Jazz). This bass does sound ok with my full setup Carvin/svp-pro / Hartke cabs.