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post #1 of 17 Old 10-13-2014, 01:54 PM - Thread Starter
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No sound out of subwoofer?

My receiver is a Optimus STAV-3670, and my subwoofer is a 10" Powered Optimus PRO SW-10P. Both of these items are old (1996+). I connect the subwoofer to my receiver through the Low Level Input on the back of the subwoofer, by using a RCA to Phono adapter. The phono end goes to my Subwoofer Pre-Out Jack, while the RCA goes into the Low Level Input, which are Red and White jacks (L/R). Whenever I play music, no sound comes out of my subwoofer, only my two speakers. Any help on how to fix this problem would be great. Thanks.
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post #2 of 17 Old 10-13-2014, 02:41 PM
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1) Does the subwoofer power LED illuminate when you turn the sub on?

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post #3 of 17 Old 10-13-2014, 02:54 PM - Thread Starter
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Originally Posted by Tom Vodhanel View Post
1) Does the subwoofer power LED illuminate when you turn the sub on?

Tom V.
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Yes.
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post #4 of 17 Old 10-13-2014, 03:08 PM
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Originally Posted by jpetruzzelli View Post
Yes.
The sub out of the receiver and the inputs on the sub are both RCA style, correct? Why do you need the "rca to phono" adapter in line?

Nevermind, I think I see. The LEFT input on the sub is RCA, the RIGHT, 1/4". Kooky.

Anyway, I'd bet both inputs sum so just use the RCA input for now.

Does the receiver give you any choice/setting for the speakers? Something like "normal or large" for the main L/R speakers for example? If you see anything like this, be sure you have all the speakers set to "normal" or "small".

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Power Sound Audio

Last edited by Tom Vodhanel; 10-13-2014 at 03:11 PM.
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post #5 of 17 Old 10-13-2014, 03:10 PM
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Are your front speakers set to SMALL in the receiver? If so, then the sub will do nothing for 2 channel content.
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post #6 of 17 Old 10-13-2014, 03:12 PM - Thread Starter
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Quote:
Originally Posted by Tom Vodhanel View Post
The sub out of the receiver and the inputs on the sub are both RCA style, correct? Why do you need the "rca to phono" adapter in line?


Tom V.
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For the low level input, there is 2 jacks (red and white), which are RCA inputs, on the back of my receiver, there is a Subwoofer Pre-Out which is a Phono jack, thus RCA to Phono adapter. If you need to take a closer look there are attachments that show the back of my receiver and my subwoofer. Thanks for your help.
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post #7 of 17 Old 10-13-2014, 03:21 PM
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Quote:
CONNECTIONS TO LOW LEVEL INPUT JACKS

Your amplifier or receiver line out jacks might be labeled either REC OUT
or PRE OUT.

Note: To use your amplifier or receiver's line out jacks, your amplifier
or receiver should have at least two sets of line out jacks.
Connecting the subwoofer to an amplifier or receiver with only one
set of line out jacks might result in no sound from the satellite
speakers. If this happens, follow the instructions under
"Connecting to Speaker Terminals."
http://support.radioshack.com/suppor...oc14/14204.htm

Frankly I find the instructions a little confusing but I would try phono from pre-out of amp to either L or R phone on sub (try both separately). If neither work, your may have to wire sub through speaker connections, i.e. "high level input"..

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post #8 of 17 Old 10-13-2014, 03:22 PM - Thread Starter
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Originally Posted by Sdiver2489 View Post
Are your front speakers set to SMALL in the receiver? If so, then the sub will do nothing for 2 channel content.
This is probably a really stupid question. But considering I'm a newbie, how would I do that?
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post #9 of 17 Old 10-13-2014, 03:25 PM
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Doesn't look like your receiver has a configurable crossover. However I still don't follow the use of a phone connector. I went and looked around at pictures and everywhere I see this connection is a RCA output. Can you please take a less shaky picture with that cable off the receiver?

Here is my reference:

http://www.ebay.com/itm/Optimus-STAV...item540eb010d0
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post #10 of 17 Old 10-13-2014, 03:36 PM
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Be sure you are using a MONO rca to 1/4 adaptor.

If that doesn't help you can either try the speaker level ins/outs or pop out the amp to be sure the internal connections still look good.


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post #11 of 17 Old 10-13-2014, 03:36 PM
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OP, it sounds as though you're using an RCA Y-splitter to connect from your receiver's subwoofer output to the L+R line-level inputs (the "phono input" you're referring to) on your sub. And from the pic it looks like the volume is turned up. So far, so good.

Questions:
- What is the low-pass filter (or "Frequency") control on the sub set to? (Bass in music doesn't extend very low, so if the filter is set too low, it could be filtering out most or all of the frequencies the sub should be playing.)
- Did you used to get sound from the sub for music and it's only stopped working recently?
- What about for movies - did/do you get sound?
- Have you tried different source inputs (TV, DVD, CD, etc.) to rule out the possibility that the input you use for music is no longer working?
- Have you tried different cables to rule out the possibility of a bad cable?

Last edited by eljaycanuck; 10-13-2014 at 05:02 PM.
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post #12 of 17 Old 10-13-2014, 03:44 PM - Thread Starter
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Quote:
Originally Posted by Sdiver2489 View Post
Doesn't look like your receiver has a configurable crossover. However I still don't follow the use of a phone connector. I went and looked around at pictures and everywhere I see this connection is a RCA output. Can you please take a less shaky picture with that cable off the receiver?

Here is my reference:

http://www.ebay.com/itm/Optimus-STAV...item540eb010d0
Hope this helps.
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post #13 of 17 Old 10-13-2014, 03:59 PM - Thread Starter
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Quote:
Originally Posted by Tom Vodhanel View Post
Be sure you are using a MONO rca to 1/4 adaptor.

If that doesn't help you can either try the speaker level ins/outs or pop out the amp to be sure the internal connections still look good.


Tom V.
Power Sound Audio
Is this what you're specifying?
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post #14 of 17 Old 10-13-2014, 05:21 PM
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Quote:
Originally Posted by jpetruzzelli View Post
For the low level input, there is 2 jacks (red and white), which are RCA inputs, on the back of my receiver, there is a Subwoofer Pre-Out which is a Phono jack, thus RCA to Phono adapter. If you need to take a closer look there are attachments that show the back of my receiver and my subwoofer. Thanks for your help.
Sure looks like an RCA jack for the sub out, from the picture. So an RCA to RCA cable will work fine. You don't need to go into both line level inputs on the sub.
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post #15 of 17 Old 10-14-2014, 06:48 AM
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Quote:
Originally Posted by jpetruzzelli View Post
Is this what you're specifying?
This is a MONO adapter

http://www.showmecables.com/product/...Fa5cMgodzXwAAw


This is a STEREO adapter

http://www.monoprice.com/Product?c_i...seq=1&format=2

Easy way to tell them apart is the black rings near the tip. One = Mono. Two = Stereo.

Tom V.
Power Sound Audio
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post #16 of 17 Old 10-14-2014, 12:33 PM - Thread Starter
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Quote:
Originally Posted by Tom Vodhanel View Post
This is a MONO adapter

http://www.showmecables.com/product/...Fa5cMgodzXwAAw


This is a STEREO adapter

http://www.monoprice.com/Product?c_i...seq=1&format=2

Easy way to tell them apart is the black rings near the tip. One = Mono. Two = Stereo.

Tom V.
Power Sound Audio
Sorry if I'm giving you a hard time by barely knowing anything. You see, this was my fathers subwoofer back in the day. The equipment I have is how it's always been set up. The 2 connectors go to the low level input into the subwoofer, and the single connector goes into the receivers pre out.
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post #17 of 17 Old 10-14-2014, 03:30 PM
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Please see post #11 for some questions to help narrow down the issue.
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