Just wondering if anyone out there has experience with this one and what the issue might be with the rather large turn on thump mine does. Holds DC offset fine and plays great just maybe hard on the speakers when first fired up. Thanks in advance.
HAHA yeah, I seen 2 others for 100c's without a response...hoping for 3rd time a charm! 😀
"Most amps without relays in the outputs" have this "thump" noise at turn on/off. it is very common to find it. it is the power supply(caps) charging and discharging. and if you have speakers with high spl...it is even louder the thump!!!
When you shut off the amp and wait awhile, measure both sides of the bridge +/- and tell us if one side has any voltage and do the big caps have any bleeder resistors across them?
Regards
David
Regards
David
That's quite true. I did most of my own DIY builds without relays and still do as long as it's not for a customer. The integrated amps that didn't thump, relied on the preamp supply rails being carefully balanced in charge/discharge cycle times by either unequal electrolytics or a dummy load resistor. This often worked fine to reduce the thump to a faint puff from the bass speakers, at least for a typical 10 year life span. The usual cheap alternative now is a JFET mute switch on the amp. input
The problem here is that the thump was probably minimal at the factory but a part or two have drifted over time to the point where the amp now thumps big-time! The manufacturer's advice would be best, if available.
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