sub

[leedsleedsfc]

hi i have the SHERWOOD RD-8108R receiver and the gigaworks g500 pc speakers.
i have a 3.5 mm at 1 end and 2 rca at the other end right and left.
when i plug the 3.5mm end in to my sub and 1 of the rca to my pre amp an my amp i just get a humming sound i have tried both rca connectors both the same.but if i plug the white 1 into my pre amp and the red 1 to tape play it works.what i want to know if this is safe to do am i breaking my SHERWOOD amp by doing this will this be using more power from my amp thanku for any help.

 

[Adam]

Welcome to the forum!

It sounds like you might have a ground loop between your sub and your receiver. I think that might explain the hum that you get when you only use a single connection point. I'm just speculating.

I don't think that connecting to the input jack on the TAPE would hurt anything. I hope others will chime in if I'm wrong.

Also, it won't use any more power from your Sherwood.

----------------

I also want to make sure that we're on the same page for the connection, so here's a bit more.

Based on the title of your thread, I'm assuming that you want to use only the sub portion of your Gigaworks G500 system with your Sherwood (and not the other speakers). If that's not the case, let us know, because the answer will be different than the one that I give below.

To connect the "PRE OUT SUBWOOFER" output from the Sherwood to the G500 sub, you would use the cable that you mentioned. You would connect the 3.5mm jack to the "CENTER/SUBWOOFER" input on the G500 (orange colored, I believe). With that input on the G500, one of the RCA plugs would be for the center channel, while the other is for the subwoofer. If that's the connection that you've made already, then you know that the white RCA connector is for the subwoofer. The red would then be for the center channel, which you don't need to use if you're just trying to send a subwoofer signal. If connecting the other gets rid of the hum, though, then do what you've done (unless someone chimes in and believes it will hurt something).

 

[leedsleedsfc]

thats right m8 i am using the orange 1 on my sub and i will not be connecting any speakers to it i just want to use it as a sub.when i use just 1 rca into my preamp i get a humming sound when i connect the other rca to the tape record it works.is there any other way of stooping this ground loop will this work rca phone y splitter so i can use both rca cables or is there other cables that would fix this.

thank you for all your help

 

[Adam]

On your first post you mentioned that you connected the red RCA connector to one of the TAPE PLAY inputs, and in your follow-up you mentioned that it was connected to one of the TAPE REC outputs. I wouldn't use the TAPE REC output because it can/will send a full-range signal to the G500 system, and the G500 will take that full-range signal as the center channel signal and might (I'm not certain) split out some frequencies to send to the sub. If it did that, then you'd get bass from a signal that you weren't intending to use. If that's not happening to you, then no worries about using the REC output.

There are ways to troubleshoot and remove a ground loop, if that's what your issue is. Here is an article from Audioholics on the issue, and here is another.

 

[leedsleedsfc]

what 1 would u use m8 if i put the red 1 any where on the amp it works even on the Digi-Link rca conecter and if i plug it in the analog center rca conecter
it works

 

[Adam]

what 1 would u use m8 if i put the red 1 any where on the amp it works even on the Digi-Link rca conecter and if i plug it in the analog center rca conecter
it works

I was wondering that myself before you asked. Now that I know that the Digi-Link connectors are RCA, I'd probably use one of those.

 

[leedsleedsfc]

will this use any power from my amp it does look like it a ground loop problem could i use a rca y splitter to connect both rca to the pre amp thank you for all your help

 

[leedsleedsfc]

this is my amp

 

[leedsleedsfc]

http://www.sherwoodusa.com/prod_rd8108.html

 

[Adam]

will this use any power from my amp it does look like it a ground loop problem could i use a rca y splitter to connect both rca to the pre amp thank you for all your help

The line-level outputs on the back of your receiver aren't going to use any significant amount of power. You'll never notice it.

I can't say if the y-splitter idea would work or not. I just don't know. If you were to take the red connector and touch the outer metal sheath to the outer metal sheath on the white connector (which is plugged into the subwoofer pre-amp output) and the hum stops, then I'd say there's a good chance that the y-splitter would work. If touching those two metal sheaths doesn't stop the hum...well, doesn't mean that the y-splitter wouldn't work.

http://www.sherwoodusa.com/prod_rd8108.html

Thanks for the link. I snagged the owner's manual at the beginning of the thread so that I could check out the back panel.

 

[leedsleedsfc]

thanku for all the help i bought a ground loop isolator ill give that a go do u think it would help thank you for all your help.

 

[Adam]

Always happy to help when we can! I don't know if the isolator will work, but I'd sure appreciate it if you'd let us know how it works for you. Thanks!

 

[leedsleedsfc]

hi got the y splitter did not work.when i have my sub on and i then turn my amp on i get a pooping sound from the sub when using the Digi-Link connectors.
when using the tape connectors i dont get this thank you

 

[leedsleedsfc]

this is my sub http://www.3dvelocity.com/reviews/progamer/progamer.htm

 

[leedsleedsfc]

hi the isolator did now work i get no sound from the sub.is there cables that would help the ground loop problem thank u