teo701 Posted May 7, 2023 Share Posted May 7, 2023 Hello i have an spl 120 for about 4 years and less and yesterday for no reason it started thumping every 2 seconds like a heartbeat. What could be causing the problem? Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted May 8, 2023 Share Posted May 8, 2023 That’s usually a sign that the amp is failing. Quote Link to comment Share on other sites More sharing options...
henry4841 Posted May 8, 2023 Share Posted May 8, 2023 The plate amp I used does the same thing on automatic but if I flip the switch to on all the time it does not do it. Quote Link to comment Share on other sites More sharing options...
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