Question about JVC RX-778V

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Sub hello i just got my jvc hooked up and when i plug in my sub all it does is hum. even if it isnt hooked up you can just put you finger on the end of the input wire and it will start humming. please help.

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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.

Posted on Jul 28, 2008

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Have jvc rx-2020v receiver with mono rca out for sub and trying to hook it up with polk audio rm 1000 w sub woofer with +/- terminals for both left ane right channels plus blue terminal(?). How to?


Your Polk Audio subwoofer is a passive sub and your JVC mono output is for connection to a powered sub. If the JVC does not have an amplified output for a passive sub, you'll either need to get an amplified sub, a different receiver, or buy a dedicated mono subwoofer amplifier.

Oct 14, 2016 | JVC Audio & Video Receivers

1 Answer

How can I hook up my jvc rx-6018v to a gemini xga-2000 amplifier?


you can do it a couple of different ways, depending on what you're trying to do with your set-up.if you're trying to do something different than what I describe here, add a comment.
for independent volume control (each unit contols volume to a set of speakers independent of each other) use the rca 'tape' out of the jvc into the rca inputs on the back of the gemini.this puts a stereo signal from the jvc to the gemini. if you want your gemini to power your subs, get an rca y-splitter (single female to double male) and a single rca cable, hook single rca cable to sub out of jvc, connect y-splitter to gemini rca inputs, and single rca to y-splitter.

Mar 05, 2013 | JVC RX-6018V Receiver

1 Answer

Major hummimng noise when sub is connected to receiver.


Is the hum in the receiver-attached speakers or the sub?


Self-powered sub?


How is the sub attached - RCA or speaker-level?


Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.


If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.

Mar 25, 2011 | Yamaha RX-Z9 Receiver

2 Answers

I have a Boston Acoustics VR-500 Subwoofer with a problem. As soon as anything is plugged into the line level RCA jacks, the subwoofer produces a loud buzz/hum. I have tried connecting it to the subwoofer...


I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).

Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.

Mar 01, 2011 | Audio & Video Receivers

1 Answer

There is no sound coming out of the subwoofer


I assume it's an active subwoofer, since it hums. Did you activate sub in the receiver menu? Did you turn up the volume on the sub?

Jul 08, 2010 | Yamaha HTR-5840 Receiver

1 Answer

Subwoofer problem


If you get your system up and running and hear an audible buzz or hum, the first culprit to look at is either the powered subwoofer or your reciever feed at the entry point to your system.



Dec 23, 2009 | JVC RX-6018V Receiver

1 Answer

No output to subwoofer.


no that is normal if it does it wile using and ur not touching it make sure power plug isnt touching the coard. and some anps do that when they r turned up to loud. or worn input or output plug

Sep 10, 2009 | Onkyo TX-SR601 Receiver

1 Answer

Sub does not work when i plug the cord into the Receiver


Does your subwoofer have a fault or amplifier? Try listening to the sub for a hum when the RCA input jacks are touched by your fingers. If it is your amp, check the bass management to see if you have activated the sub output. If it seems to be the amp and you have checked everything. Take it for repairs to a Yamaha service center.

Jun 05, 2009 | Yamaha HTR-5860 Receiver

1 Answer

Connecting Powered Subwoofer to a Receiver


you will need a line-level converter to use this subwoofer- it is a rectangular-shaped box with wires coming out on one end and red-and-white RCA plugs one the other. The end with the wires coming out will hook to the receiver, and the other end will need to plug into the sub.

Feb 20, 2009 | JVC Audio & Video Receivers

1 Answer

Yahmaha rxz9 no output signal to sub


the part where you plug in the sub has blown or warn out over night dude get it repaired i think u need to change the fuse inside the reciever

Dec 31, 2008 | Yamaha RX-Z9 Receiver

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