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Hmmm I just got the same problem. They worked fine on my old Dell desktop but when I plugged them in to my son's old Dell PC (maybe 1 year newer than my old one) they all hum like crazy - as you say even if it's just the power plugged in and nothing else. Yes it does have the original power supply. I get no music (but still it hums) from digital out/in but when I switch to analog out/in I hear the music and it still hums, plus the sound is distorted. Wierd.
If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)
You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.
It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.
Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.
Disconnect everything, and turn it on. If it hums, it needs repair. Then try hooking up one cable at a time. If a connection hums, try another cable. If it hums no matter where you plug it in, try a 2-prong power plug adapter, or a ground-lift plug, as it's called. If nothing works, it may need a repair in its power supply. It would still turn on, but buzz no matter what you connect.
first off nice choice on the amp check ur power and ground connections make sure the main battery to bady ground is good if questionable add a new one cant hurt to have extra grounds from the batt to the body make sure the amp ground is as short as u can make it make sure its grounded to bare metal if any of these dont work u may have a prob inside ur amp
Either you have it configured incorrectly this time around, or the settings are defaulted back to original on your DVR........ adjust your DVR sound properties/settings. and check all wires/connections as well.
You need:
1) 2 4-ohm subs
2) Appropriate enclosure
3) Amp wiring kit with RCA's
Connect each sub to a separate channel and set both mode switches to "MONO" (center position). In 2-channel mode, this amp is only rated at 80 Watts RMS, so you need relatively small and efficient subs. I'd say nothing bigger than 8" or perhaps 10". Rockford-Fosgate P1S48 (8") and R1S410 (10") will work OK with 50-150 watts RMS. Some others will also.
Problems like this are usually the result of one of two conditions, the lack of a properly grounded phono cable connection at either the amplifier or the sub. To help isolate this problem, try plugging the end that goes to the amp into a jack such as the Tape Out. If the hum goes away then there is a problem with the sub out. If the humming doesn't change then it is either the cable or the Sub itself. The other condition is what is known as a difference in ground potential between the amp and the sub. If both components have grounded (3-pin) plugs you may have to isolate the ground of the sub by using a 2 to 3 prong adapter and ground the sub to your receiver.
Most amplified sub woofers need to be grounded to the output source.If you plug the sub woofer in to the receiver you would use a ground wire from the receiver to the sub woofer there should be a ground terminal on the sub woofer and receiver.
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