If the CD player is plugged in to the { main in } and there is no volume control what so ever
Power amps without built-in volume controls are always running full out. There is usually some form of preamp, control amp or receiver before the amp to provide source selection and volume (*) as well as any other signal processing.
* If you think about it, your CD player (or any other source) is also running at full volume unless it has an output level control. Hence, the volume knob actually LOWERS the volume from maximum rather than raising it from minimum.
That should be normal. The main inputs usually go directly to the power amp. If you want volume control, put a mixer with faders beween them... Radio Shack used to have some inexpensive mixers.
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