Hey, im fairly new to the whole preamp, power amp concept. I have a Fender BXR 400 Dual Bass (bridged 2 X 200W). I am wondering, if i were to buy a preamp, would i be able to use it safely with my existing amp? The Fender does not have a "Preamp in", it only has the normal line ins and about 3 effects returns. Is it unwise to send a preamp out, into another preamp? On a completely non related issue, what are some decent middle of the road rack mount preamps, preferably with the ability to blend between transistor and tube. Thanks guys.