Hi I am making a preamp and active crossover using the lm833n dual op-amp. I have already done a project similar to this one and both the preamp circuit and crossover circuit worked beutifuly, although that project used a split supply and for my car audio I need a single supply. I have already tried a single supply preamp circuit useing just the basic single supply opp amp circuit which consists of the voltage divider with a capacitor accross the grounded resistor, just like the single supply circuits you can find on the tda2040 or tda2050 datasheets. It worked fine. I am using the high pass crossover circuit design from the datasheet. But I am not 100% sure on how the crossover single supply circuit ia sopposed to look. I figure it is essencially the same as the single supply op amp circuit with the imput impedence resistor connected strait to the center of the voltage divider and with a capacitor on the output. is it the same?