When using the 400BDG, use the Orange for Positive and Yellow for Negative. 4-channel amps, use the Green for positive and White for negative. (The 400BDG in no longer available from ORION.) The DIN input: The din input can be used to power Orion crossovers and equalizers with the same style DIN plug. Din Plug Diagram. 1. -15 Volts 2. Left Input 3. Ground 4. Right Input 5. +15 Volts Amp Model 4ohm Power Lowest Recommend Impedance in Stereo Fuse Size S/N THD Frequency Response Accepts 400BDG Dimensions L x W x H 220gx 20 x 2 4ohm 10 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 4" x 8.5" x 2.25" 240gx 40 x 2 4ohm 20 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 7.5" x 8.5" x 2.25" 280gx 80 x 2 4ohm 30 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 11" x 8.5" x 2.25" 2150gx 150 x 2 4ohm 50 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 17" x 8.5" x 2.25" 4100gx 100 x 4 4ohm 70 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 22" x 8.5" x 2.25" 2350gx 350 x 2 4ohm 60 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB No 22" x 8.5" x 2.25" GS-100 50 x 2 4ohm 20 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 7.5" x 8.5" x 2.25" GS-1000 100 x 2 4ohm 30 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 11" x 8.5" x 2.25" 225HCCA 25 x 2 0.5ohm 35 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 11" x 8.5" x 2.25" 425HCCA 25 x 4 0.5ohm 70 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 22" x 8.5" x 2.25" 250HCCA 50 x 2 1ohm 50 amp 110dB 0.03% 6hz to 30Khz +/- 0.5dB Yes 17" x 8.5" x 2.25" For questions on this or any other Orion Products, call Technical Support at 1-480-705-5600....