Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Help
Wiring, Electrical & Installation
Audi A4 low output from aftermarket sub.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="naiku" data-source="post: 7097093" data-attributes="member: 563468"><p>Over the weekend I tapped into the stock wiring harness on my B7 A4 w/Bose in order to add a sub/amp. Since the signal coming out of the head unit is line level, I tapped into there in order to get a low level signal direct to my amp. I tapped into pins 21, 22 and 7 (the Audi uses a common ground) of this wiring harness:</p><p></p><p><img src="http://pictureposter.audiworld.com/111393/bose_amp_pinout_32pin.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The problem is I have to have the gain turned all the way up on my amp to get any kind of output from the sub. I figure the line outs from the stock HU are not likely to be as good as an aftermarket HU. I am using an MRV-F345, with channels 3+4 bridged, and have the gain set at 0.2V. I know this amp can drive the sub (11KV.2) much louder than it is as I have used it in the past.</p><p></p><p>I know I can get a line driver, but don't know that I need one yet. Where should I start testing with a DMM to see if something is wrong with my connections? Should I first test at the connections on the wiring harness where I spliced into in order to figure out the voltage coming out of the stock HU? and then check at the end of the RCA to see if there is a difference? What should I have the DMM set at?</p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="naiku, post: 7097093, member: 563468"] Over the weekend I tapped into the stock wiring harness on my B7 A4 w/Bose in order to add a sub/amp. Since the signal coming out of the head unit is line level, I tapped into there in order to get a low level signal direct to my amp. I tapped into pins 21, 22 and 7 (the Audi uses a common ground) of this wiring harness: [IMG]http://pictureposter.audiworld.com/111393/bose_amp_pinout_32pin.jpg[/IMG] The problem is I have to have the gain turned all the way up on my amp to get any kind of output from the sub. I figure the line outs from the stock HU are not likely to be as good as an aftermarket HU. I am using an MRV-F345, with channels 3+4 bridged, and have the gain set at 0.2V. I know this amp can drive the sub (11KV.2) much louder than it is as I have used it in the past. I know I can get a line driver, but don't know that I need one yet. Where should I start testing with a DMM to see if something is wrong with my connections? Should I first test at the connections on the wiring harness where I spliced into in order to figure out the voltage coming out of the stock HU? and then check at the end of the RCA to see if there is a difference? What should I have the DMM set at? Thanks. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
Audi A4 low output from aftermarket sub.
Top
Menu
Home
Refresh