I have wired up my amp and bass box to the head unit, but when i turn it on all my bass box keeps doing is thumping even if there is no music playin. everything to my knowlage is wired up correctly but i can't see why it is doing that. my bass box is bridged, but i can't see how that would have anything to do with that. hope you can help many thanks
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Re: The bass box
Remove the Audio inputs from the bass box to see if the thump is coming from the Audio input. Of course do this with everything turned on. What we are trying to figure out is where the thump is originating from. If the bass box does not thump when the audio inputs are disconnected, the thump is coming from somehwere between the bass box and the circuits inside the head unit.
If you still have the thump after the Audio input wires are disconnected, then your bass box's amplifier has noise problem. You might try getting a noise filter from best buy to put on the power supply feeding the bass box.
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Because even though your stereo is turned down the gain for the sub is set all the way up so it will still gain a small amount of signal. it is a flaw with some of the newer aftermarket stereos. try turning the nob until the thump stops then change the bass setting on your deck to compensate for the bass loss.
its in the amp and sub itself, what kind are you running, facing the sub forward helps amplify the sound forward and vice versa, id seal the boot up with sound deadener or polyfill, the less movement in the car the higher the chance the bass can travel, if its the thump you want make sure you have the lpf (low pass filter) switched on the amp, raise the gain and if you can do it on your amp bridge the wires, more info would be great on what your running. if you have the sla feature on head unit turn that up, bass frequency on head unit and amp shoould be between 55 to 80 up to 110 on both amp and sub. hope this helps
you could have a bad remote wire running to the amp or a bad remote circuit in your head unit, try connecting a small wire to the remote and jumper it to the power wire on the amp if this turns on the bass simply wire in a toggle switch and turn it off when you turn the car off so you dont drain the battery
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.
you are better off setting your deck speakers amp to a high pass filter setting on the amp. Adjust gains to increase desired bass and clarity. Turn off loud button if you have one, that will distort your deck speakers.
Had a similar problem, mine was a power problem. Power meaning voltage. Those big bass speakers draw lots of power. My original alternator couldn't keep up.
Question: Do your headlights dim in rhythm to the bass hits?
If so, your sound system wants more power than your vehicle is producing.
My first solution was a high output alternator. It worked great.
Then I added another amp. Not great anymore.
My second solution was to tie in a large capacitor to the amps power supply. (These a big (1 farad), about the size of a Pringles can)
Your amps power consumption is not uniform. Each time your amp punches the bass, it draws extra power. If that power isn't available, it starves and shuts down (if only for a second) then restarts.
The higher the gain, especially using a low pass filter, the more power needed for each thump. Thats why when you turn the bass down, you can get higher volume from the rest of the system.
How a capacitor can help (simply put): In this application, the capacitor acts like an auxiliary battery, smoothing out power fluxuations. The capacitor builds up its charge literally between bass hits when power demand is low. Then releases it's charge when the demand is high. Think of it as an on-demand power boost.