Question about Audio Players & Recorders
Hi! The thumping motion is usually caused by faulty cross-over voltage biasing. What this is is simple; Power amps of high wattage are usually constructed of two similar but opposite polarity amplifiers ;one drives the top (positive) part of the sinusoidal and the other drives the bottom.
The simple causes that need to be eliminated are
1) Earthing :-check earthing to ensure no earth loops
2) Check the Power fuses:- usually, the supply of power to only one part of the amplifier causes thumping motion. The power section in these designs have a positive and negative polarity eg.=80V-0V-(-) 80V
3) Disconnect the speakers and check the power supply Voltages across the output stage sumettry for more details visit
Posted on Dec 04, 2008
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Posted on Jan 02, 2017
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