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This is due to the internal speakers which might need replacing, it sounds better with external speakers because they are plugged into the headphone socket which shows the internal speakers are damaged, get them checked out.
hi, Do one thing set the control behind the sub. set the level and cutoff control at it half position. Set phase control at "0" position. Then test the sound. if you ate using tower speaker as front speaker then you have to set the position of phase control 180 , ok
Wiring speakers with reverse polarity doesnt have adverse effects. It cant give distorted sound. Seems like the wiring from the head unit to the speaker might be at fault. For testing purposes, connect the speaker directly to the head unit, bypassing, the car wiring. If the sound comes out alright, you have to replace the car wiring. If it is still distorted, speaker might be at fault. Try with a different speaker.
The head unit may be rated at 200 watts but it cannot produce more than ~20 watts of real power per channel. There's no way that it can drive the high end speakers to a level that will be needed to compete with the subs on a 1000 watt amplifier.
please check sound using external speaker.
if the result is same as using internal speaker, it's mean your mainboard may have problem, but try to install sound driver first.
if the result is different, you may have some loose screews inside your laptop and it stuck on internal speaker.
if you still have warranty, send it to acer.
Are you still using the same head unit? You could try to run a short set of new wire to one of the speakers directly from the unit. Had you previously used these speakers in another vehicle...what I'm getting at is that you need to isolate the problem. If the speakers test fine in another vehicle, I would think there is something wrong with the existing head unit