Is there any reason you are using a 500/5 for your system then? It would seem more logical to use a 300/2 or bi-amp your components using a 300/4. You can easily sell a used 500/5 for the price of a new 300/2. That amp would sound much better since its a dedicated 2 channel with a larger power supply and 50 more watts per channel, and has more crossover adjustments.