Question about JVC HX-D77 Shelf System

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Subwoofer??? When I hooked up my system and hooked it all up, I noticed that only one of the subwoofer holes is releasing air? Is that normal? What can I do?

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Re: Subwoofer???

Switch it around connect the right side to the left output and connect the left side to teh right input and see if the same speaker isn't pushing air if it still isn't pushing air then you have a few damaged speakers. If it starts to push air on the side that didn't then it could be a dead output.

Posted on Jun 24, 2008

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Re: Subwoofer???

I have the same stereo system. The JVC HX-D77 has 4 air ducts (GIGA TUBES). The lower two are very active air ducts. The upper two are more passive but they still move air. If only one of the subwoofer air ducts is moving air you may have big problems because one subwoofer channel drives the subwoofer and the woofer above the subwoofer. If it was the left channel air duct that is not working both air ducts on that channel should not work and both air ducts on the right channel should work. If only one side is not working check the wireing make sure that both wire ends are in perfect condition. If they are this may indicate one side of your subwoofer amplifier may be fried. If you actually only have one air duct working that would indicate that you would have three faulty speakers. (Highly unlikely) I would recomend that you unplug your JVC HX-D77, remove both speakers (Main and subwoofer) check all of the wires. If they are fine hook your speakers back up and plug the unit in. If the problem still persists contact JVC.

Posted on Oct 08, 2007

Re: Subwoofer???

You should double check the wiring.

Posted on Oct 03, 2007

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That subwoofer is included in the MHC-GX450 system. I have the amp/CD/radio unit. but not the subwoofer. The control cable connects the LED on the Sub to the main unit. When the main unit detects this connection to the LED it switches on its internal subwoofer amp to drive the subwoofer.

Does the JVC receiver use a "control" circuit through its external subwoofer unit to signal that it is connected to the subwoofer? If not, you do not need to use the control jack on the
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Is the LED on the front of the subwoofer unit glowing?
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The picture is unclear what size that is but they make adapters for RCA-Stereo-Cable-pair-to-single RCA (Y-adapter) or to smaller 3/16" mono or stereo jacks.

The manual in case you need it. No guidance on operating the optional sub.

Your unnamed sub's manual should have some advice, huh?

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2 Answers

Ok i just got the sub from a sony sswg450 i want to know is there some way to hook it up to my Pioneer home Receiver

Did you get a manual with it? According to the Sony site this speaker originates in Sony MHC-GX450.

"This product bundle includes the following models:
RM-SC3 - REMOTE CONTROL for Shelf Mini Systems

Find the manual here and learn a bit about your seprated sub...

See page 7.

As can be seen, the subwoofer has two connections to the mothership, very unlike the standard speaker level (+/-) speaker wire or RCA-Line-Level subwoofer out that 'normal passive or active subwoofers use, respectively.

Not knowing which of those your unspecified Pioneer receiver supports, it is impossible to say. Does your Pioneer have that control jack?

Mini-systems are generally not designed to be pieced out and used with grown-up gear. The absence of standardized connections is the clue.

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1 Answer

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You may not have the subwoofer connected properly. there should be a certain plug for the woofer. It is labeled sobwoofer. Subwoofer do not put out sound like the other speakers. When you test it fell the first of the subwoofer for vibration. they also have volume controls, checkthat.Some have on off buttons. good luck

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You can order the Subwoofer of the JVC website.

It have all subwoofer.

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I just got one of these units, the SONY SS-WG990.
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