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First, re-initalize the piano. The instructions are in your manual or on the manufacturer's website. If that doesn't do it, try the headphone out. If the headphone works but the speakers don't it can just be a dirty jack. However, if none of this works the amplifier board is probably blown and you'll need a repairman.
Sounds like either there is a problem with a low frequency driver or perhaps an eq setting.
If you have an external (line) output, you can try sending the signl through another amp. If you have headphones, then try them also. If the headphones sound distorted as well,then see if you have the eq to high on the bass.
Other than that, it could be a filter capacitor in the power supply. You would need some experience fixing that.
If you can get sound from the headphones, it may be that you need to have that jack replaced- there's a cutout on a headphone jack so that the sound to your speakers is off when headphones are in use. If you cannot get sound from either the headphones or speakers, it's probably an amplifier problem- which needs a tech. Is it under warranty?
Are you using the 1/4 inch adapter- if so- make sure the mini plug is fully seated- you should feel 2 detents as you push the plug into the adapter- if you do not, you may be bridging the tip and ring colar with one channel and because it is not seated fully, it is not contacting the other channel at all.
Also make sure the plug for the headphones is fully seated into whatever device you are listening to. you should feel the 2 detents each time.
The bypass switch in the headphone jack is likely broken. NEVER unplug the headphones while the amp is on.
There are certain small amps that have a possibilty of popping the power amp due to a feedback arrangement. Likewise, never use the headphone jack for ANYTHING other than headphones.
When it was knocked over it may have cracked the main circuit board, but does the pilot light come on at all? If the pilot light comes on but no sound is output from the speaker try plugging some headphones into the head phone jack and then turn it on and see if you can hear sound in the headphones. I have had a similar problem before and the main speaker had gone bad but it would still play thru the head phone jack.
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