If I leave my radio volume low like around 10, the bass sounds fine. When I turn the volume up say around 20 or higher, the bass goes way down and it is distorted. some people said it sounds like a burnt voice coil but I am not sure
I had the same problem:
You probably have the type speaker with a dustcap that says EARTHQUAKE in big letters from left to right.
If you look on some video's on you-tube, they have a different dustcap with a kind of star-shaped shape in it.
You have the old type and if you use it in a sealed enclosure which is too small, something that is glued underneath the dustcap comes loose and starts rattling. Contact Earthquake and ask for the updated dustcap which doesn't have that glued part and repair your speaker or let them do it.
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You need to install a heavier gauge wire to your amp and a capacitor.
It works fine at low volumes because there is enough wattage from the
battery to power the bass output of the amp but at higher volumes the
amp does not have enough power.
Heavier gauge wire supplies more poer, and a capacitor stores a reserve
of wattage for the amp to use so that it does not run out while
blasting your tunes.
It sounds like the installer wired the amp remote turn-on terminal to an "accessory" lead in your vehicle. Many stock radios do not have a dedicated amp turn-or lead and the alternative is to connect the amp to a switched power source (ignition or accessory). This means the amp turns on whenever you turn on the vehicle ignition, often resulting in a thumping from the subs. It is a perfectly satisfactory alternative, and will not damage either the amp or the sub. But it's irritating.
If the thumping is objectionable, have your installer wire a SPST (Single Pole, Single Throw) toggle switch inline with the turn-on wire. The switch should be mounted so it is accessible by the driver, and whenever you turn on the radio, turn on the toggle switch.
The level control controls the input level coming from your head unit (receiver) to the amp.
Your Sony users manual is a little vague on how to best adjust the level and other controls.
Here is one method that some installers use and works well with most amps.
Most 10" subs sound best between about 80-100hz and below, so start out by setting the LPF at about 80hz. The HPF will not be used. Next turn the bass boost and gain all the way down. Turn on the radio and set all tone controls, bass, midrange, treble to flat, usually "0" on most head units. Turn the volume up to approximately 3/4 volume level or just until you begin to hear distortion. Now, back the volume down until the distortion is gone. Next turn up the gain control on the amp until you hear the subs start to distort then back the gain down until the distortion disappears. Next turn the bass boost up again until the subs begin to distort, then either back the bass boost down or back the gain down until the distortion is gone. You may need to play around with the bass boost and gain controls to get exactly the sound you prefer.
Check wires that go into the speaker.Try turning the bass down than turn the volume up.If it sounds good when volumes down and as you turn it up it gets worse your amp isnt putting out enough power.whats the amp? power wire gauge should be same as ground.what gauge are they? Check ground to make shure you are getting a good connection & power wire isn't loose at any of the connection what size fuse are you running under the hood?
You need to look got the amp for the sub if there is not one there is notting you can do. If there is one then just turn up the gain on the amp.
If not there are some times the gain is on the radio in a setting and the only way to find that is to look in the user manuil.
it might be that your wires from your amp to your subs are too thin. since they were relatively new the first three months, they were probably undamaged, but after pushing them too much, they probably have broken wires, and can't get enough power to the subs when turned up, i suggest getting thicker wires before investing in a capacitor, it could save you money.