(1) Rockville REQ42-B 2 x 21 Band Home Theater Equalizer w/ Audio Spectrum Analyzer. Rockville rpa60bt 1000w home theater bluetooth receiver+2 x 21 band equalizer eq usb input for music files from usb thumb drive. This equalizer has a weight of 6 lbs. Signal to Noise Ratio 80 dB. Rockville REQ42-B Black 19 Rack Mount 2 x 21 Band Equalizer w/Spectrum Analyzer.