Hi, my dad has been looking for a better quality stereo amplifier, he currently owns the Yamaha A-S701 and is looking for an upgrade. He cares about sound quality the most. So far we've looked at the Cambridge Audio CXA81-80 and the Arcam Radia a15 which has got great reviews but the problem with those amps is they don't have tone controls on them and he specifically wants tone controls like bass, and treble. He's looking to spend anywhere up to £1000. Any suggestions on Amplifiers that offer superior sound quality over the A-S701? Thanks.