I have a setup of the Yamaha RX-V 485 AVR and NS-P41 speakers, however the sound output is very low. Even the inbuilt TV speakers produce louder sound than my AVR+speaker setup. I need to set it to -20db to hear descent sound. Is this normal or anything wrong with my setup. Does NS-P41 support this receiver? If I need to replace the speaker, can you please suggest a good model thats compatible with rx-v 485?