Sub not coming on my receiver - AVS Forum

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Receivers, Amps, and Processors

boonie300's Avatar boonie300
01:03 AM Liked: 10
post #1 of 11
01-15-2012 | Posts: 10
Joined: Jan 2008
Need help...I have a 11 or 12 year old Sony Str-de475 receiver and a audio acoustic pa-120 sub,monster sub cable and It won't put out sound at all...I have the sub set to on and the LFE set to 0 and my bookshelf speakers set to small in my receiver,my old sub worked fine but haven't had one in 3 years...Also,when I hooked my sub to the direct tv cable box it worked so I'm not sure if it's a sub problem or a receiver problem...any help would be appreciated!
Roger Dressler's Avatar Roger Dressler
02:41 AM Liked: 465
post #2 of 11
01-15-2012 | Posts: 9,239
Joined: Jul 2000
Remove the cable feeding the sub at the rear of the receiver. Touch the tip pf the plug with your finger. If you hear buzz, the sub is working. Now look for reasons why nothing is coming out the sub output jack.
YeuEmMaiMai's Avatar YeuEmMaiMai
05:17 AM Liked: 11
post #3 of 11
01-15-2012 | Posts: 1,076
Joined: Apr 2002
things to check assuming you have everything wired correctly

1. does source being played have a lfe track?
2. is bass management enabled?
3. does your receiver think you have a sub attached? if not, change setting approperiately
a. are your speakers set to small?
b. are lfe effects routed to sub?
4. if you are using auto sense turn on off tech try raising the sensitivity or turning it off completely thus leaving the sub "on" all the time
Roger Dressler's Avatar Roger Dressler
11:08 AM Liked: 465
post #4 of 11
01-15-2012 | Posts: 9,239
Joined: Jul 2000
Quote:
Originally Posted by YeuEmMaiMai View Post

things to check assuming you have everything wired correctly

1. does source being played have a lfe track? Doesn't matter.
2. is bass management enabled? He said it is.
3. does your receiver think you have a sub attached? He said it does.
a. are your speakers set to small? He said they were.
b. are lfe effects routed to sub? Where else would they go with his settings?
4. if you are using auto sense turn on off tech try raising the sensitivity or turning it off completely thus leaving the sub "on" all the time. Good question.
YeuEmMaiMai's Avatar YeuEmMaiMai
11:48 AM Liked: 11
post #5 of 11
01-15-2012 | Posts: 1,076
Joined: Apr 2002
Quote:
Originally Posted by Roger Dressler View Post

1. does source being played have a lfe track? Doesn't matter.
2. is bass management enabled? He said it is.
3. does your receiver think you have a sub attached? He said it does.
a. are your speakers set to small? He said they were.
b. are lfe effects routed to sub? Where else would they go with his settings?
4. if you are using auto sense turn on off tech try raising the sensitivity or turning it off completely thus leaving the sub "on" all the time. Good question.


1. On some receivers, it does matter if the source material has a LFE track. Yamaha even states in their RVX manual that this is one of the reasons you may not get sub output when listening to x.1 material.... Yamaha RX-V467 manual page 72 states this specifically and referrs you to page 77 for an explantion of LFE.....

3.
b. on my ancient Yamaha HTR-6535 receiver it is possible to route the LFE to the mains even with a sub attached.
boonie300's Avatar boonie300
03:41 PM Liked: 10
post #6 of 11
01-15-2012 | Posts: 10
Joined: Jan 2008
Thanks for the replies...I dont think it's the sub cause it works when I have it hooked up to the cable box...I had a bic 100 sub a few years ago and it worked fine and I havent changed anything so I'm thinking the receiver must now be defective...just my guess.
boonie300's Avatar boonie300
04:11 PM Liked: 10
post #7 of 11
01-15-2012 | Posts: 10
Joined: Jan 2008
This might be a stupid question but could some subs just not be compatible with some receivers?
Roger Dressler's Avatar Roger Dressler
04:52 PM Liked: 465
post #8 of 11
01-15-2012 | Posts: 9,239
Joined: Jul 2000
Quote:
Originally Posted by YeuEmMaiMai View Post

1. On some receivers, it does matter if the source material has a LFE track. Yamaha even states in their RVX manual that this is one of the reasons you may not get sub output when listening to x.1 material.... Yamaha RX-V467 manual page 72 states this specifically and referrs you to page 77 for an explantion of LFE.....

But not if the bass management is turned on, and that's the case we are discussing.

Quote:


b. on my ancient Yamaha HTR-6535 receiver it is possible to route the LFE to the mains even with a sub attached.

Yes, many AVRs can do that even today. It requires that the mains be set to large, which is not the case here. And even if they were, the sub signal would still feed the sub in parallel.
Roger Dressler's Avatar Roger Dressler
04:57 PM Liked: 465
post #9 of 11
01-15-2012 | Posts: 9,239
Joined: Jul 2000
Quote:
Originally Posted by boonie300 View Post

This might be a stupid question but could some subs just not be compatible with some receivers?

Highly unlikely.

Have you tried running the internal test tones to see if a) it reports it is creating a subwoofer signal, and b) it is audible?
boonie300's Avatar boonie300
11:56 PM Liked: 10
post #10 of 11
01-15-2012 | Posts: 10
Joined: Jan 2008
Quote:
Originally Posted by Roger Dressler View Post

Highly unlikely.

Have you tried running the internal test tones to see if a) it reports it is creating a subwoofer signal, and b) it is audible?

Not sure,I'll have to check when I get home...I'm going to take the sub another house on a different receiver to make sure if it really is the sub or receiver...if I have to get another reciver which one would be good for under 200 bucks...if I have to get one on eBay I'll do that if there is a good deal I can find.
Roger Dressler's Avatar Roger Dressler
01:29 AM Liked: 465
post #11 of 11
01-16-2012 | Posts: 9,239
Joined: Jul 2000
^^ If you already tried the test I suggested in post #2, then there's no need to take the sub to your friend's house. If you just want to hear audio thru it, plug it in to a CD player or iPod.

Better yet, have your friend come to your house and walk through the setup and make sure it's all fine, or confirm the AVR's sub out is indeed dead.
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