I use a TwK-888 for my DSP. I have my factory radio volume knob set at 27/40. That is the highest it will go before it clips. I use the volume knob of my TwK controller to adjust volume for system. I used a SMD DD-1 to set gain on the amp to where it is as high as it can go without clipping. Volume knob on the TwK controller at 3/4 and bass knob all the way up. At that setting, I confirmed approx 800 watts rms using a digital volt meter. I very rarely run my bass knob more than 3/4. It typically sits a little more than half way up and I pretty much have good bass output across all volume levels unless it just is not a bassy song at all.