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?

Behringer stuff is cheap because it is cheaply made. It is, for the most part, lower quality beginner grade bass equipment. Their cabinets handle a lot of wattage, but I've heard more horror stories of the speakers blowing and cabinets dying than I have heard positive testimonials. For me, I'd save my money and buy a better quality product. No need in spending the money now, then turning around and spending it again in 1-2 years.
