There are a number of electronic problems that can cause the H3000 (or any audio product) to have a higher than normal noise level. There are also a number of operator settings, connections, and functions that can make the unit sound noisy even though it is working normally. Finally, because there is no simple way to quantify noise in normal operation, it is easy to imagine that a unit is noisier than one remembers it.
Here is a quick, objective way to give the H3000 a rudimentary check for noise problems:
| Set the H3000 to Program #102. Set both pitch and delay to zero. |
| Set the H3000 Input and Output levels to 0dB. |
| Connect a distortion meter to both outputs (one at a time) and set the meter to read around -70dBm near full scale. |
| Insert any low-pass filters available above 30kHz. Our meter has an 80kHz LPF. |
The meter should read approximately -68 to -72 dBm. If it is significantly higher (or lower!) or the channels are more than a few dB different from each other there may be a problem.
This page created 22 Sept. 2005