I'm planning to connect a turntable (with line out) via an ADC to my Playbar. The playbar will be mounted on the wall and the turntable will be a foot or two away, slightly below the Playbar, on a wooden bench on the wooden floor. There shouldn't be a risk of vibration (I'm banking on my neighbours warning me before I wind it up that high) but what is the likelihood of feedback from the speaker via the stylus / cartridge? My understanding is that cartridges only work on physical movement, and not on "audio through the air" like microphones - is that right?
Associated question, is there any backward-sound transmission from the playbar? If I mount it on the dividing wall, will my neighbours notice? ;)
Best answer by Stanley_4
The turntable will respond to vibration, the base or arm can both be a problem with air conducted sound while the base is also subject to physical vibration of what it is sitting on. A good quality turntable with the arm/cartridge properly set should be able to resist a reasonable amount of both. Your foot away and below should be good at moderate levels. Removing any top/cover/lid on the turntable while playing is usually a good idea too.
Worst case get longer cables for the turntable and move it several feet away and to the side when playing it and move it back when done. My turntable lived on top of my Klipsch La Scalla where it looked great most of the time but when things got loud it moved to a big pizza stone set on the floor well away from the bottom horn.
Any speaker mounted to a wall adds physical vibration conduction to the usual air making the wall vibrate so it may well bother your neighbors more. If I was in your situation I'd look at a non-wall mounted position to keep the neighbors happier.