We all know that the instrument and the amp need one another in order to make sound. But which part of the equation do you put more stock in for making the instrument really sing? I ask because I was recently doing some research on the bass I play in my band. It was given to me by a friend and it plays well and I can get it to sound good with the right EQ and amp, so I figured it must be somewhat decent. But I looked on EBay for this model and found that they usually only sell for $75-100 used and $125 new. I was pretty damn shocked that it's a lower-end model. A couple weeks ago I had it plugged into an Ampeg 8x10 and it gave me the kind of rumble and snarl I had always wanted out of a bass and had usually associated with higher-end P-Basses. I also noticed this with my guitar collection, too (I'm mainly a guitar player). I have tons of crappy Harmony and other Sears guitars in my collection, and through certain amps they sound like ****. But a few months ago I decided to play a few through my pretty decent Fender half-stack and with the right EQing they were able to really shine. One guitar in particular I got for $50 off EBay and it had this clear, chimey tone I never would've expected it to have since it sounded really muddy and gross through my smaller combo amps. I'm looking for a secondary back-up bass since my band is going to start gigging soon and I just want to come prepared. I was initially thinking of getting a better quality bass and using my current one as the back-up. But I'm wondering if, while using the right amps, I could just buy another $75 bass, either the same model or a comparable model, and just use that to switch as a main or use as a back-up. It won't play as well as a better quality bass, but I care more about sound since I don't play the most technically proficient music.