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Does anybody know the ohms for a Behringer ULTRABASS BX4500H?

It's safe @ 4 ohms. I've run mine at both 4 and 8 ohms. Should sound good, but keep the DEEP and ULTRABASS switches off because they can blow your cab drivers. SHAPE works well though, IMO. DEEP is like turning the BASS WAY UP, which is unecessary because you have a bass knob to bring up the low end gradually (recommended).

Start with OUTPUT (Master) at 12:00 noon, along with BASS, MID, and TREBLE. Start with GAIN at ZERO, then slowly bring up GAIN to desired volume. Now adjust you EQ the way you like and you should be fine.
If you bring the GAIN up to NOON, like the OUTPUT master, it should be frikin loud! That's my experience.

Not safe at 2 ohms.

:bassist: