I was using a Sherwood receiver and switched to a Nobsound NS-05P passive preamp and a Crown X-1000 power amp. The speakers are Boston Acoustics A26 bookshelf speakers. The clarity is amazing! I was using a subwoofer but am now just using the Bostons. I have no tone controls and do not need any. I cannot get over how good this sounds.\n\nIs anyone else using a passive preamp, which is really just a volume control?\n\nPeace and goodwill.