Audiophilepure

Was the noise the result of my room’s electrical supply? I have two sets of dimming lights in my room, and there have been occasions when components have been particularly sensitive to them. If the lights are on fully or off, the noise is all but eliminated, but if the lights are dimmed, then the noise can intrude. However, I found that even turning the lights off entirely did not eliminate the noise. One solution I tried was insertion of cheater plugs (3 to 2 prong adapters) for the power cords, and that reduced the noise by a perceived 50%, but it did not eliminate it altogether.

Other components such as the Heaven 11 Billie Amp Mk2, which is a tube hybrid class D integrated amplifier, or the PS Audio Stellar Strata Mk2 Integrated Amplifier have never had noise issues. Conversely, the Legacy i.V4 Ultra Amplifier at times has been a bit noisy like the AP-507, but not as loudly. All this took place while using the TEAC VRDS-701 and CG-10M-X upstream, so using a full TEAC system is not a fix for the potential of the AP-507 exhibiting noise. The simplest solution is to use these amplifiers with less efficient speakers and if necessary, insert an adapter plug.

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