I have the FD 4150 and the FD 2100, as well as I bought my brother an FD 2100. All have a slight whine to them (through the speakers.) I've had these amps for a long time but now with pro audio, that whine is a little loud
When I first was installing my 4150, my alpine amp had no whine, and on the amp rack in the exact same spot with nothing changed, the 4150 had the whine. I don't believe it's engine whine, just something inside the amps and how they are built. Also, I've used 2 different headunits, same noise on both. My brothers 2100 has the same noise.
To complicate things a little, if I turn my car to just the accessories on, the whine is going without the engine on. So when I turn my engine on, obviously the whine is there and the same. When I turn my engine off though with the accessories still on- the whine disappears
Anyone hear anything about these amps having noise issues? I've searched but can't find anything.
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TEAM XS - MECHMAN - FI - AUDIOQUE
152.6 OUTLAW AND CLIMBING