Amazing sound quality, very powerful, extremely well-built, easy to maintain
None at all.
"Huntingdon-based Quad have been making the award-winning "current-dumping" amplifier for many decades now. You'd be lucky to find their 99 or 909 power amplifiers for under £750 these days, but for about a quarter of that you can get a 405-2 - their original current-dumping amplifier, with current overload protection added.
The 405-2 is a power amplifier only, which means that it has no controls on it - not even a power button. You'll need a preamplifier ..."
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