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  1. Hi all, great site Was hoping to get some advice or suggestions because the issue I am having with my sub is driving me to distraction! Hardware: Black Jensen SPX-19 glass-topped sub woofer (about 13 years old) driven by Onkyo receiver. Connected from amp via stereo RCA composite cables. Switch set to 'Auto'. Phase switch set to 'Normal' and 'Video/Audio' set to 'Video. I usually have the front 'Volume' left dial set to about 11 o'clock and the 'Frequency' right dial set to about 9 o'clock. Great sub and wonderful depth. Problem: Sub used to automatically go into standby mode (when not enough level from amp or amp powered off) but now no longer does. Instead the blue LED indicators on the front of the sub blink on & off with the red LED and the sub itself 'rumbles' until eventually after a few minutes it goes into standby mode. Very frustrating! If I just turn off the sub by the power GPO it stops the rumbling and the flashing LEDS and the sub just powers 'off' but this is neither practical or ideal to do every time I've finished with it. Was hoping a power-cycle of the sub might fix it but it didn't. This is a new fault. Have enjoyed this sub for many years and never had an issue with it. I presume this is the Auto-switch (located at the back) which I'm guessing is either faulty or the cause of something else failing? I've tried changing RCA leads both at the sub end and at the receiver end but no change. I must admit i haven't tried a different amp but I am assuming this is a sub issue and not a receiver problem. Love to hear from anyone who might have some insight or knowledge of this sub or even of the issue itself. Am I right in assuming it could be the auto switch? If so is this serviceable or repairable? Let me know if more info is required to troubleshoot or if anyone has any suggestions or advice! Thanks in advance Robbo
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