Hi, Im new to this site. I hope i dnt cause any confusion by posting in the wrong section I have a Car Subwoofer equipped with its own amp, and i wanna hook it up to a home system. If i plug the wires directly into the speaker coming from my home amp, bypassing the amp on the speaker, i get extremely low volume. And i don't know where to hook up the Ground and Power wires coming from the speaker amp. Thanks a million
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1. Check audio wiring.
2. Check subwoofer power cable.
3. If you have any way to substitute for the subwoofer this can confirm wiring.
4. The crossover in the amp may not be working, sending no low range to the subwoofer.
Is the rattle random or related to the source signal?
It could be excessive low frequency content or resonance. Since it's intermittent you might want to determine what conditions lead to the problem and see what changes affect it. Proximity to a turntable will almost certainly cause feedback, for example. Cables should be routed away from strong sources of magnetism or power supplies.
To answer your question;
From your description of the problem it sounds like your powered subwoofer has a power supply circuit problem.
It would be either with the large capacitors in the first stage of the supply(most likely) or with the regulation system that supplies +-15 volts to the preamp section.
If you are not familiar with electronic circuits you could still ask a repair shop to verify those large capacitors.
It sounds like you are describing an earth loop problem. I won't go into detail in this post, but try an isolation test first. disconnect everything from the reciever except the sub and try connecting say a BATTERY powered mp3 player or cd player to minimise connections to the electrical mains earth. you could also isolate things by taking your sub to a friend's house and trying it on their system. If it is an earth loop use a process of elimination to find out which two pieces of equipment causes the earth loop. then apply filtering. you can buy earth loop isolation transformers for about AU$26 and I've used one on my sub myself. Theyhave RCA (phono)plugs on each end and they connect inline with the signal cable to the sub amp.
as for the thumping sound it might be the speaker protection circuitry cutting off the amp to protect the subwoofer speaker from damaged. This might be triggered if the earth loop sound is causing the sub amp to overload and clip.
Failing this there might be a dried out overheated electro capacitor in the amp circuit causing the hum. Hav a chat to your local electronics person, who should be able to spot it! Hope this puts you on the right track Happy Hunting!
The simplest way is to insert the sub into the speaker wire run -- connect your receiver's speaker output to the sub input, then the sub output to the speakers.
These are the "High Level" connectors on the left side of your sub.
If your receiver has a subwoofer out (either one or a stereo pair) then you'll get better quality sound by connecting that output to the "Low Level" connector or connectors on the right. If you have stereo, then use both connectors. If your receiver only has one subwoofer output, then connect it to the left (may or may not me marked as "mono" depending on the age of your sub)
Hopefully that helps. If it's confusing, post back questions or post the details (brand and model) for your receiver. If it's helpful, please hit the Thumbs-Up for me!
Look for the sub pre out on the back of your amp and connect a sub cable to this and next to the LFE or phono type input on the back of the sub ,if it has two inputs left and right pick the left side ,set the cross over to suit your system and speakers,if you are not sure set the cross over to 80 hertz,this is a thx standard.
hope this helps.