This Bass head - Behringer 450 watt, BX4500H costs only ab0ut $200 at Guitar center. Why is it cheap considering it is 450 watts? Is the sound quality not good?
i'll bite: cause it's made cheaply.
IME behringer stuff sounds as good as many of the items in the next price bracket up... but they are made cheaply and as such are more prone to breatk down. for instance I had a friend who bought the gtr combo and it blew the poweramp just after a year... so no warranty at that point.
it had really cheap pots - you could just feel the cheapness.
in short... I would buy a mixer from them, or an fx pedal, or even a comp (altho my autocomp has a broken switch)... but I'd stay away from anything powered - just my opinion.