Technical Pro EQ7153 Dual 21 Band Professional Equalizer Dual 21 band equalizer with individual LED indicators Inputs: RCA (4 audio sources), MP3 (1/8'') Outputs: RCA (record, main) Frequency response Fluorescent spectrum display Direct/Equalizer function allows option of unfiltered pass-through Bass booster increases the low frequency Total Harmonic Distortion: &lt;0.02%