5-Pin Power Plug ZAPCO Equalizer Line Driver SP4-SL SP4 SL

4-Pin Power Plug HELIX Equalizer Line Driver Amplifier

3-Pin Power Plug ZAPCO Equalizer Line Driver EQ

4-Pin Power Plug US AMPS Equalizer Line Driver Amplifier

2-Pin Speaker / Power Plug ZAPCO Eq Line Driver Amplifier

4-Pin Power Plug HELIX Amp Equalizer Line Driver Amplifier

3-Pin Power Plug SOUNDSTREAM Equalizer Line Driver MPQ-5XO BX-10 BX-12 INT-2BX

5-Pin Power Plug SOUNDSTREAM Line Driver Equalizer BX-20Z