Have 2 monitors both with same problems. Hissing and popping noise when first turned on, goes away after 1 minute of warm up. After playing music for a few minutes, low freq speaker will stop working. Sometimes tweeter stops working. The only way that I have found to make them start working is to short input center conductor to ground for short time to create a loud pop which "shocks the speaker/s into working for awhile. Seems like if I can get the speakers to play for an hour or so, they will be more stable. I really need a schematic to do some voltage measurements.

SOURCE: Tannoy Reveal 66D

One possibility is that the mute switches on your speakers have oxydized contacts INSIDE the switch - this kind of malfunction mostly occurs when the equipment is exposed to moisture and/or smog.

The most common solution is to change both switches, but they can also be disassembled and cleaned up (which is a bit more complicated and time consuming).

Another possibility is a dried up filter capacitor in the power supply or somewhere in the preamplifier section, possibly also a bad preamplifier chip but if your speakers work fine (with the exception of the mute switch noise), then the problem is more likely with the switches.

Also, check the internal connectors for any dirt, broken wires or desoldered pins.

Could also be something else, you should know i'm only assuming on the possibilities and i'm listing the most common problems i've encountered so far.

Regards

3rq8 (Triarcuate)

t support

• 169 Answers
• Posted on Oct 23, 2009

SOURCE: i need a tweeter or the specs for a hi freq.

Try this link

http://www.jblpro.com/pages/recording/4400.htm#4412A

Thanks for using FixYa, I hope this helps.