Tuesday, October 19, 2010
Air has noise, and other measurements
It's particularly funny to remove an amplifier and see the voltage reading go up IN THIN AIR. It's like the amplifier cables are shorting out the air around the banana jack. Fortunately the air has a rather high impedance so the cables win. But one can wonder what affect this has on amplifier circuitry.
BTW, with 6dB's of attenuation dialed in on its level control, but otherwise being fed by the noisy Behringer DCX 2496, I get 1.8mV wideband and 0.3mV "A" weighted noise from the Parasound amplifier. The majority of that may still be from the Behringer itself.
Posted by Audio Investigator at 5:27 PM