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it is a Sharp DVD Cinema sound system Model no HT-DV40H Serial No 90803857
The crackle is at the same level whatever the volume. it is a similar noise to radio interference. the sound is perfect at any volume then the crackling starts will go off for a while then starts again. It does not make any difference if you use the remote or the volume control.
No noise from Sub-woofer just the two other speakers