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Old 12-11-2018, 09:51 AM   #1
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Re-running an audio wire in the walls

In another thread, I discussed a problem I had with my Classic 30. The subwoofer audio cable (two RCA jacks) runs through the walls of the trailer to under the center of the sofa where the sub is located. I have power there (12v) but one of the audio lines is broke somewhere in the walls.

How to fix.

AS said the only way they can do it is to remove furniture, the wall window boxes and to peel back the inner aluminum to run a new wire. That sounds drastic. It also sounds like it may create other problems down the line. I talked with Vinnie's AS repair in Sacramento (AS told me to call him) and he said the same thing. Too much to remove for a simple cable. He also is booked into March and cannot help me. AS offered to reimburse me for his work. AS wants me to take it to Scottsdale AZ for them to work on. We had planned on storing our trailer in AZ and drive back to Ohio end of January. We are coming back west in the spring. I was trying to avoid pulling the trailer back to JC in Ohio during the winter.

Is there another solution? Is this really my problem?
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Old 12-11-2018, 10:01 AM   #2
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One thought I had was an audio transmitter. The plug up in the cabinet is an inverter connected plug. I'm not sure what is under the sofa. Most of these devices come with a black box power cord. I cannot find a 12v version.

This could work and avoid the incredible two days of work on the trailer. The transmitter/receiver can be on the high-end side to ensure no lag or cutouts at low volume. I'm guessing Airstream would be quick to reimburse me for that solution and to avoid the whole mess.

The sofa has electric recliners that will work with the inverter. There probably is a line down there I could use to power the receiver.
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Old 12-11-2018, 05:51 PM   #3
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I had the same problem. It turned out that I had power to the sub woofer however the sub was not outputting any sound. Sounds like your problem. The solution was to adjust the settings on the subwoofer. They are in a small panel on the side of the sub that has to be removed. Whenever I adjusted the settings up the sub will for works like a charm. Be aware that you can also adjust them so high that it will blow a fuse.
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Old 12-11-2018, 05:53 PM   #4
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Originally Posted by ErnieDurbin View Post
I had the same problem. It turned out that I had power to the sub woofer however the sub was not outputting any sound. Sounds like your problem. The solution was to adjust the settings on the subwoofer. They are in a small panel on the side of the sub that has to be removed. Whenever I adjusted the settings up the sub will for works like a charm. Be aware that you can also adjust them so high that it will blow a fuse.


My cell is 513-608-2833 if you want to discusd
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Old 12-11-2018, 06:18 PM   #5
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My cell is 513-608-2833 if you want to discusd


the service guys did a continuity test on the audio cables and said one was not good.

But can i trust them?
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Old 12-11-2018, 06:22 PM   #6
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i ran small diameter conduit or cable tray type molding
that was far easier than snaking cable through the wall and snagging on insulation

i suggest just run new wire using those wire concealing products
get them at any big box store
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Old 12-11-2018, 06:41 PM   #7
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Bluetooth...
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Old 12-11-2018, 07:34 PM   #8
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got a great idea from ernie. move the sub to under the dinette next to the tv.
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Old 12-12-2018, 07:45 AM   #9
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Good news,

If your airstream has only one subwoofer then it is mono, not stereo.

What does this mean? You only need one of those RCA connectors to work!

Normally in such a set up only the left output (white) from the back of the stereo is used.

Even if your subwoofer has a left and right input just use the left!

No need to pull anything apart!

I have been messing with audio systems for 25 years in cars/boats/ATVs/trailers/houses.

Hopefully this helps you out, any questions let me know.
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Old 12-12-2018, 08:29 AM   #10
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Originally Posted by Gsmblue View Post
Good news,

If your airstream has only one subwoofer then it is mono, not stereo.

What does this mean? You only need one of those RCA connectors to work!

Normally in such a set up only the left output (white) from the back of the stereo is used.

Even if your subwoofer has a left and right input just use the left!

No need to pull anything apart!

I have been messing with audio systems for 25 years in cars/boats/ATVs/trailers/houses.

Hopefully this helps you out, any questions let me know.
Very interesting! Let me give it a try.
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Old 12-12-2018, 08:42 AM   #11
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Quote:
Originally Posted by Gsmblue View Post
If your airstream has only one subwoofer then it is mono, not stereo.

Even if your subwoofer has a left and right input just use the left!
He's right.
Low frequencies are not directional. They seem to come from everywhere.
If you feel you need two inputs on the sub, put an RCA "Y" cable in the path and split the one signal into two. The only reason some subs have two inputs is so the other speakers can be looped through them.
Also, don't be shy about moving the sub if it's more convenient elsewhere.
In addition, unless Airstream punctured the wire, it's unusual for a cable to fail in the middle. Before I tore things up, I'd cut the ends off and replace or test.

Bluetooth? I don't think this will work for your application because of digital delay.
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Old 12-12-2018, 09:07 AM   #12
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Here are images of both ends of the sub. The Axxess device seems to be attached to several speakers. Maybe two fronts. Two rca outputs go to the sofa.

At the sofa, the two rca jacks plug into a harness that plugs into the sub.
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Old 12-12-2018, 09:30 AM   #13
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That wiring is giving me a heart attack!

Ok, so as I read this: the stereo plugs into the Axxess device (I can't see what kind of connection that is). The RCAs connect into the Axxes device on the other side and those run to the sofa and plug into the sub.

Is that correct?

If so:

1. It would be good to see the input to that Axxes device are they speaker type wires or RCA?. I am not sure if it is a noise suppresser or a speaker level to RCA level adapter

2. what does the connection at the sub look like.
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Old 12-12-2018, 09:38 AM   #14
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Ok, what make/model is the stereo. Can you send a clearer picture of the back of the unit and the jumble of wires?

The axxes device is a line level converter

https://axxessinterfaces.com/product...gory=AX-ADDAMP

It changes "speaker level" output of the stereo into "line level" RCA output for sending to an amplifier. This is used if the stereo does not have a dedicated "Sub out" RCA conector.

Your sub will have an amplifier built into it and will need the RCA connector for the signal.

Note: most modern stereos have "sub out" on them and the axxes device should not be needed.

But any which way. The original point stands. If the sub is working with just the white RCA plugs connected, plug the red ones back in and leave it all alone, it is working as well as that set up can.

If not - report back!
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Old 12-12-2018, 09:42 AM   #15
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The polk audio amp does not have a separate sub output.

The sub does not work at all even if I switch the red/white cable on the sub end. We know the sub works as they removed it from my unit and took it to another trailer to test. It worked there just fine.
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Old 12-12-2018, 09:47 AM   #16
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I'm going to buy a 12' rca cable at best buy and try replacing the one in the trailer. If that works, it is the break in the line causing the problem.

Is the Axxess device just using one contact per rca jack? Like the center of the connector? If that is true, I could use just one of the lines for the pos/neg connection.
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Old 12-12-2018, 10:01 AM   #17
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I see that you can adjust the signal going to the sub with the two screws on the top of the unit. I tried turning them up (down?) and nothing happens.

Interestingly the sub has a door on the side and it has two controls for the same purpose. Ernie (another classic owner) clued me into this. His were turned all the way down. He turned them up and got his working.

In my case, they tested my sub and it worked on another trailer
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Old 12-12-2018, 10:45 AM   #18
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Some more info needed:

Make and model of the stereo
Make and model of the separate amp.
picture of the controls and input on the sub

There are a lot of things that can be wrong here and without knowing the specifics of the set up it is not terribly efficient to trouble shoot. For example, the Axxes line converter could be faulty, replacing the RCA cable would have no impact in that case.

If I know the model of the stereo and amp I can pull wiring diagrams and talk you through some options.

I am more than happy to help
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Old 12-12-2018, 10:30 PM   #19
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OK. Here is what I found.

I went to BestBuy and bought a 12 ft audio cable with RCA connectors on the end. I plugged it into the Access and ran it to the sub and plugged it in there.

No go. I listened real carefully and heard something coming from the sub. I turned up the two dials on the axccess and voila! Bass.

I then went back with the original cable and plugged it back in. Bass! But only one of the RCA jacks is working. It still produces bass, but on older songs that have a left or right bass signal, I can lose the base if it is on the broken line.

The bass is not very loud. Ernie told me about the door on the sub box that contains two volume controls inside. I'm gonna try that next. Unfortunately, the way the sub is mounted, I need to get a long thin screwdriver to miss some of the sofa frame and to reach the screws to take the sub out. Tomorrows another day!

I did order outlaws wireless audio transmitter/receiver ($129) to complete the signal. They can be powered by 110ac or 5v USB. There is a plug behind the sofa rear center. I can either run a small AC strip and a USB power block or I can tie into the USB that is on the side of the sofa. We will see.

In the cabinet there is a 5v USB already I can use. The plugs and USB can also be powered by the inverter.
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Old 12-13-2018, 07:04 AM   #20
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Glad you are making progress.

As that is the route you are committing too, maybe this will help as you have 12V power at the sub. You can splice into the existing power and not take up an outlet:

https://www.amazon.com/Converter-Mod.../dp/B00BMIVFK8
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