troubleshooting

I haven't used my speakers for a year and when I turned them on again I got this high-pitched noise, irregardless of the volume. Sample here: https://vocaroo.com/11CAt5RpqVfv Any idea what's wrong and can it be fixed? It's quiet annoying and I can't really even listen to the TV with this...

Hello, I recently bought a Yamaha A-S801 amplifier. This unit seems to be in protection mode. When I turn it on, the yellow power lamp starts to blink within 5 seconds and the unit can't be used. I can't seem to get this working. Any tips on how I can reset it or get it to power up again...

Hi I have a problem with my subwoofer. It happened suddenly. I have a Bowers & Wilkins ASW608 woofer and Yamaha A-S501. I've been using this system for over 4 years now. There are 2 pairs of speakers attached to the system too - one pair of MA BX2 and a pair of Opera 1.5 The problem with the...