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"Output to subwoofer" won't put out...

75.111.25.76
Posted on December 10, 2010 at 07:27:10
sanman
Audiophile

Posts: 1780
Location: Redwood Coast
Joined: November 13, 2004
 Hello,
I acquired a Mitsubishi AV receiver used and hooked up my first 5.1, using an optical cable from the Plasma TV as the source. Very nice sound from all 5 channels, sans subwoofer. Then I put a nice 10" alnico driver in a box as a DIY sub and tried to hook it up to the "output to subwoofer" rca mono jack in the AV. I turned subwoofer function on, etc no sound. redid the y cable wiring (from traditional speaker jacks on the sub to the single rca jack on the AV)still no sound. Am I missing something, or maybe the AV is malfunctioning?
"When the demon is at your door, in the mornin' it won't be there no more"
Steely Dan

 

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Buy it a drink or two. (NT), posted on December 10, 2010 at 07:56:31
Kal Rubinson
Reviewer

Posts: 12443
Location: New York
Joined: June 5, 2002

 

Seriously, you need an amp for it., posted on December 10, 2010 at 07:57:27
Kal Rubinson
Reviewer

Posts: 12443
Location: New York
Joined: June 5, 2002
 The RCA output is at line level and the lash-up sub needs an amp to drive it.

Kal

 

RE: Seriously, you need an amp for it., posted on December 11, 2010 at 16:07:05
DavidLD
Audiophile

Posts: 4884
Joined: May 29, 2002
 Yes, check Parts Express or similar to add a low cost subwoofer plate amp to add to your DIY sub. One that produces 50 watts should be fine, and they should be in the 50-$75 range.

Modestly priced receivers that come with speakers often have the sub amp built into the receiver. I have a an inexpensive 5.1 Sony set up that way. http://www.sonystyle.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10510551&storeId=10151&langId=-1&productId=8198552921665061026

But oddly more expensive receivers do not do it that way. They are made to drive a self-powered sub.

 

And justly so., posted on December 11, 2010 at 17:16:23
Kal Rubinson
Reviewer

Posts: 12443
Location: New York
Joined: June 5, 2002
 The majority of subs are powered and that complements the fact that the majority of AVRs provide line-level outputs for them.

Kal

 

RE: Buy it a drink or two. (NT), posted on April 29, 2011 at 15:44:29
mwhitmore
Audiophile

Posts: 1720
Location: San Francisco
Joined: September 17, 2008
 You beat me to it, Kal.

 

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