I have a Radio Shack # 21-541A speaker. I know I read on here or some where how to fix these speakers so the amplifier stage stays on all the time. In its factory configuration it has some kind of timer circuit that cuts off the amp after about 20 seconds with no audio, like a sleep mode. It pops when it comes back on and it also pops intermittently when there is no audio and its supposed to be sleeping. If anyone knows the fix that bypasses this sleep timer or a link to it that would be swell.