Using Computer Speaker system in Vehicle (A how to guide)
I have been using my logitech x-540 5.1 speaker system in my truck for the past 2 years and am very happy with the results. It is powered via the vehicle power and using the 4 existing factory speakers. I prefer this setup for a couple of reasons. Designed for computer use, low cost and most of all the remote on/off and volume/bass control. I like this setup so much I had to find another set for my Motorhome project (A new Frontier). Found a set on kijiji used, for the same money I paid originally (I'm sure the seller was very happy). This method can be used on other speaker systems I just prefer this model. Anyhow here is how I do it.
This it the sub box and remote
I removed the panel on back, this is the existing 120v power supply
This is the AMP guts
I removed the sub speaker as well to remove power supply
This is the 14.6v side we need to be concerned with I have circled the positive side (you can see the circuit board trace goes from wire to fuse)
This is the backside showing the ground side (notice the bigger traces usually a good sign it the ground)
Installed the new wires for DC
Solder the new DC wires to where the original wire went to (polarity matters)
Install rear panel back in place and added connectors for ease of install/removal
Now usually this sub sits on a floor, The Motorhome has "shag" carpet and didn't want the bass getting absorbed by the carpet so I installed a piece of wood to simulate a solid floor. Makes for good bass
Side view of sub speaker and reflector wood
For power this is the best power supply money can buy and very reasonably priced for all it does DC-DC-USB sold in MP3Car store!
Last step is to set your voltage output on the DC-DC-USB power supply. Just put your voltage in and click set and save.
I hope this helps someone to get some good sound with volume control using existing factory speakers and not break the bank doing it. SNO