Originally Posted by
Earl K
- Sorry to say , but when amplifiers go "BANG" in the night, the following pic shows the usual result to the diaphragm ( these things are fragile ) .
- Forget using Pink Noise .
- One wants to listen to a pure "Sine Wave" at upwards of 1 volt ,( measured by a DVM/DMM at the drivers terminals ) with tones swept from @ 650 hz up to 3 or 4 Khz . Actually a tenth of this voltage is more than loud enough for my ears and will usually reveal most problems .
- With this sine-wave tone sweep , distortion and/or a cracked & broken surround will manifest themselves in any manner of unpleasant sounds .
- If you need new diaphragms or have any doubts about checking yours / I'd suggest taking them to a qualified professional . If you personally install new diaphragms , any implied JBL warranty is null & void .