Hello, I have a power amp Carpower 4/600 a Rainbow SLX front system and an ESX SXB 300 subwoofer. The Rainbows run via channels 1+2 The sub moves to 3+4. I have the following settings: BASS EQ: 8 – 18 db X-OVER: HP, LP, FULL (Habe channel 1+2 on HP and 3+4 on LP) LP: 30 – 150 khz HP: 15 – 150 khz GAIN: 6 – 0.2 Can anyone tell me what they should stand for or what GAIN means at all? My favourite music direction is Techno.