Low volume bass

If you have over driven the amp by playing it real loud with the bass control turned up, it is very possible that you have toasted the output stages of amp.
Every time you boost a tone control by 3 db you have doubled the output power at that frequency. So if you are "coasting" along at a nominal 75 watts, the moment you boost the bass by 3 db the amp has to put out 150 watts at that low frequency.. Go to +6db and now the poor amp has to kick out 300 watts! And so on.

Rule of thumb - you never use your tone controls at very loud levels. Tone controls are there to compensate for the poor frequency response of the human ear at low volume levels - the Fletcher Munsen effect. At low volumes our hearing with the lows and high frequencies so when you play something at low volume you boost up the bass and treble to compensate for poor hearing. At loud volumes our ears respond properly.

If y.ou have an electric release for the trunk, then unplug it and use the key. If the trunk stays shut, then its an electrical problem. If the trunk still opens by itself it is mechanical and use the gap the other expert recommended. If this a new vehicle for you there could have been collision damage in that area with poor adjustments or cracked parts.

Hey there, the problem with your sony is not a hardware problem, the headphones are completely fine, its the amount of bass you are putting into the headphones, there are two solutions to this, if you're using a mobile device (Apple, android etc...), go to your app store and download an equaliser e.g poweramp, with this, you can adjust the sound going through to your headphones using the built in equalizer (usually 5-10 bands, research this if you have no knowledge of equalisers), you can use this to turn down the bass frequencies in the sound, or the only other thinkable options are if you are already have an equaliser in use, turn it down, because putting all of the bars to the top makes the sound horrible, research on some suggestions for equaliser presets (another word for equalizer settings), or just turn the volume down.

the reason this happens is because bass naturally overpowers treble, and if it is too loud, the treble and mids will be significantly quieter, headphones are a menace for this, so all you have to do is tweak the sound a little (using an equaliser) to find that perfect balance between the different elements of sound.:-) :-)

Hope this helped mate :-) :-)

If you have a spec sheet as far as volume and any trunk dimensions I can design exactly what you are seeking.

it sounds like you havnt got the memory live conected on your hea duit or it is conected to an ignition live this is no good it needs to be conected to a permenent live to ensure the memory has power at all ties of it coulb be that the amp needs adjusting for low volume use
to set up a sub you turn up the volume to the required level then adjust the amp acordingly hope this helps ben

theres a high low button on your amp

Are you sure you don't have any shorted wiring or defective speakers?

You could start by adjusting the Treble and Bass. The treble is what makes the high notes more nodicable, so if you turn the Treble up you should be able to hear more vocals. The Bass is what makes the low notes more nodicable, so if you turn the bass down you should be able to stop the shaking which I'm guessing is the low notes. On the other hand if you have an aftermarket radio then there might be a Mute or ATT button. Theses are for instant quiet, just repress the Mute or ATT button and it should be fine. I hope I could help.
-Andrew Hawkins

Perhaps the speaker cons got damp this would effect the sound output try and plug in a speaker to one of the outputs and se if the sound is better.

could be low current ,disconnect all power including ground for 20min N.B most amps will seem to be shorted at output but this is normal due to damping ratio.