Stagg 500 BAH USA 500W(RMS)/8 Ohm Solid State Bass Amplifier Head 1/4" input jack, Volume, passive/active impedance selector switch 3-band EQ (Treble/Middle/Bass) Compression, Master Volume, 1/4" CD/MP3 input jack EFX loop send/return 1/4" input/output jacks balanced XLR output