Got a NBN car subwoofer with amplifier. the bass often stops working. wat should i do? thx

It sounds like your amplifier may be clipping, which can cause distortion and eventually damage your subwoofers. This can happen if you turn the gain or bass boost too high, or if you are pushing the amp beyond its rated power.
Here are a few things you can try:

1. Check the wiring: Make sure that the positive and negative speaker wires are securely connected to the amplifier and the subwoofers, and that there are no loose or damaged connections.
2. Adjust the gain: Turn down the gain on the amplifier to reduce the amount of power being sent to the subwoofers. Start with a low setting and gradually increase it until the subs are playing at a comfortable volume.
3. Check the bass boost: If your amplifier has a bass boost feature, turn it off or reduce it to a low setting. This can also cause the amplifier to clip and damage the subs.
4. Check the impedance: Make sure that the subwoofers are wired to the correct impedance for your amplifier. Wiring them incorrectly can cause the amp to overheat and shut off.

If none of these solutions work, you may need to have your amplifier and subwoofers checked by a professional.

https://www.amazon.com/subwoofer-plate-amplifier/s?k=subwoofer+plate+amplifier

Either the subwoofer speaker or its amplifier failed - they couldn't handle the extended use. Simple test to find out which: put the volume really low, connect another subwoofer (or a large normal speaker) to the bass output on the receiver and play some music. If you get sound then the original subwoofer is faulty, just get a new one. If you don't get sound then the amplifier for the subwoofer channel has failed. You could replace it yourself if you have enough electronics repair experience, otherwise it will be cheaper to just get another good sh low end receiver from a site like Ebay.

i dont know

Have you checked the fuses inside the amp?Unscrew the cover and with the amp sitting on its back,remove the cover.You have 2-4 fuses,old round type,in there.

Hi, ok the Bose Acoustimass III system consists of two small cube speakers and one subwoofer unit called the Acoustimass bass module. If the subwoofer stops working, three points can be the cause of the failure. The Bose Acoustimass III is a passive system, meaning the speakers do not power themselves, but instead are connected to a receiver or amplifier. Thus, the amplifier, the speaker between the amplifier and the subwoofer, or the subwoofer itself could be the issue.

Things You'll Need:

* Amplifier
* Speaker cable
* Extra subwoofer


Instructions


Disconnect the speaker cable from the back of the Bose Accoustimass bass module and connect it to a subwoofer that is known to be working. If the subwoofer works, the bass module needs to be replaced.


Disconnect the speaker cable from the back of the receiver or amplifier you are using and from the back of the subwoofer in Step 1.


Connect a speaker cable that is known to be working between the back of the receiver or amplifier and the back of the Accoustimass module. If the module starts working, then the cable was the issue.


Disconnect the speaker cable from Step 3 from the back of the amplifier or receiver, then connect the cable to the subwoofer port on the back of an amplifier or receiver that is known to be working. If the subwoofer works, the receiver was the issue. If the subwoofer still does not work, verify that the speaker cable is in the subwoofer port of the receiver/amplifier and that the cable is connected securely to the subwoofer.



If you think you did the connection properly,Fine... If not you can use the manual from the below link and know how to connect it properly..

products.bose.com/pdf/customer_service/owners/og_am5iii.pdf


Have a nice day..

try using a ohm meter and if its not making what the factory specs are its most likly it will keep loosing more and more power then stop working which is what ive had happen to me before

the transistor that mount to the amps body (heat sink) inside. most common issue with these.

One of a few things.

The fuse inside the amplifier section is blown.
The amplifier has died
The speaker is dead.

Best to return to the place you purchased the unit or contact Velodyne for service.