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Bobbo

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Posted: 07/08/18 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

I have a question for the audiophiles on here. My wife and I are both relatively hard of hearing, and can't get the benefit of the full range of sound. The sub-woofer under the front dinette seat of our 2017 Airstream Flying Cloud 23FB takes up a lot of the storage space where it was placed in an inside storage bay by Airstream, and I have read that it takes a significant amount of power even when the radio is turned off. That is a consideration when boondocking, which we do a lot.

Is there any harm, at all, if I just unplug it and take it out of the trailer completely?

Thank you


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LittleBill

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Posted: 07/08/18 09:06pm Link  |  Quote  |  Print  |  Notify Moderator

no, as long as the amp for the entire speaker system is not built into it.





p220sigman

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Posted: 07/09/18 05:17am Link  |  Quote  |  Print  |  Notify Moderator

More than likely no problem taking it out. I'd unplug it and make sure the remaining sound is ok before actually removing it. If you remove it, but sure secure the speaker wire(s) so they can't short against anything as they will still be live.

bighatnohorse

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Posted: 07/09/18 07:08am Link  |  Quote  |  Print  |  Notify Moderator

Agreed on unplugging it an trying it out.
A subwoofer adds a lot to a sound system. You might miss it.

Power; it depends on the speaker and how it is hooked up.
My stereo has a "trigger" wire which turns on the subwoofer after power is turned on at the stereo head.

So when the stereo is turned "off" the trigger power de-activates the subwoofer. Airstream is a pretty good unit and I would think that the factory would build and install it using the trigger wire setup.


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Bobbo

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Posted: 07/09/18 08:33am Link  |  Quote  |  Print  |  Notify Moderator

LittleBill wrote:

no, as long as the amp for the entire speaker system is not built into it.

After removing the sub-woofer, I did turn on the radio and all of the other speakers worked just fine. Does that mean it wasn't the amp for the entire speaker system?

wa8yxm

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Posted: 07/09/18 09:07am Link  |  Quote  |  Print  |  Notify Moderator

Just be sure to tape up the connections and label them in case someone else wixhes to sub woof.

Actually that speaker goes to below the audio range (20Hz is the bottom of audio) into "Sub Sonic" (often down to 10 or less HZ) so you "Feel" more than hear what it does for you.


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p220sigman

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Posted: 07/09/18 11:12am Link  |  Quote  |  Print  |  Notify Moderator

If you unplugged it an everything else still works, you should be fine if you are satisfied with the sound. In all likelyhood, it was not run off of a separate amp either, so it probably didn't have a draw when the sound system was off. But you may still need to find if it had a separate amp if you are worried about it drawing power. If it has a separate amp and that amp is powered when the system is off (unlikely, but possible if the person wiring it wired the turn-on trigger wire and the power wire together), just disconnecting the speaker won't stop that power draw. If it has a separate amp, it could be anywhere, but I'd check the compartment the speaker is in and the radio location first. When you find it, you should be able to just remove the fuse and don't have to remove the whole amp.

If the radio is reasonably easy to pull out, pull it and see if there is a subwoofer pre-amp output. If there is and there is an RCA type cord plugged into it, there is an amp somewhere for sure. If there is an output and it is not being used, the sub was probably running off of the internal amp in the radio.

Bobbo

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Posted: 07/09/18 08:44pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

Just be sure to tape up the connections and label them in case someone else wixhes to sub woof.

Actually that speaker goes to below the audio range (20Hz is the bottom of audio) into "Sub Sonic" (often down to 10 or less HZ) so you "Feel" more than hear what it does for you.

I got a pair of female-female RCA gender changers and filled one side with liquid electrical tape, then plugged them into the RCA connectors. The hot pin of the plugs is enclosed in the gender changers, and the other end is insulated. The power plug was already enclosed as long as I don't stick an ice pick in there. [emoticon]

I put the sub-woofer in the closet in the house. When we go to get rid of the Airstream, I will re-install it just like it was when I bought it.

p220sigman wrote:

If you unplugged it an everything else still works, you should be fine if you are satisfied with the sound. In all likelyhood, it was not run off of a separate amp either, so it probably didn't have a draw when the sound system was off. But you may still need to find if it had a separate amp if you are worried about it drawing power. If it has a separate amp and that amp is powered when the system is off (unlikely, but possible if the person wiring it wired the turn-on trigger wire and the power wire together), just disconnecting the speaker won't stop that power draw. If it has a separate amp, it could be anywhere, but I'd check the compartment the speaker is in and the radio location first. When you find it, you should be able to just remove the fuse and don't have to remove the whole amp.

If the radio is reasonably easy to pull out, pull it and see if there is a subwoofer pre-amp output. If there is and there is an RCA type cord plugged into it, there is an amp somewhere for sure. If there is an output and it is not being used, the sub was probably running off of the internal amp in the radio.

My 29 year old son was over this evening and I discussed this with him. He looked at the sub-woofer and pointed out that the sub-woofer has two knobs, labelled "GAIN" and "FREQ." He says that means the amp is probably in the sub-woofer, so I am good on removing it.

I can pull the radio and look at the back. I will do that. Thank you.

1492

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Posted: 07/09/18 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

So it sounds like, no pun intended, it's a self-powered sub? As mentioned, subs are non-directional. So can place it pretty much anywhere you have room, out-of-sight preferred in most cases. Maybe in the under bed storage for new massage feature? Or just get rid of it. [emoticon]

Bobbo

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Posted: 07/09/18 09:26pm Link  |  Quote  |  Print  |  Notify Moderator

1492 wrote:

So it sounds like, no pun intended, it's a self-powered sub? As mentioned, subs are non-directional. So can place it pretty much anywhere you have room, out-of-sight preferred in most cases. Maybe in the under bed storage for new massage feature? Or just get rid of it. [emoticon]

In addition to the two RCA jacks, it also has a power connector with, I think, 4 wires. It is definitely powered by more than just the RCA jacks.

We are putting it up in a closet at the sticks and bricks house. We will re-install it whenever we decide to get rid of the trailer.

ON EDIT:

I went out just now and looked. There are 3 wires on the connector, black, red and blue. Originally, there were also 2 white wires, but they have been cut off. Here is a picture of the sub-woofer's controls/connections. The power plug you see has 6 pins, but like I said above, the connector that plugs into it originally had 5 wires, and 2 of those were cut off.

[image]

* This post was edited 07/09/18 09:39pm by Bobbo *

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