I have been using a PM1000 intercom in my aircraft for about 15 years now and for sound quality and reliabilty it is first class.
I fitted the PS1000 because at the time it offerd more functions than any other unit (including passenger individual volume & squelch controls).
One of the PS range of audio panels has been chosen to be fitted to a 7 seat classic aircraft project that I am working on largely because it offers a lot of functions that the other audio panels don't. we have had a lot of help from the UK PS Engineering agent Harry Lees (Lees Avionics) in getting the right unit for what we need to do, (It turned out that the best unit for us was intended for fitment in helicopters).
The product support seems very good but the unit in my aircraft has never given any trouble so I cant tell you how fast PS are at fixing things that go wrong.
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