Front and Rear jacks into one stereo port?

Daniel Cohen · Jul 10, 2015

Sorry if I describe some things wrong. I'm not very knowledgeable about tech.

I have an Optoma MovieTime DLP Projector. Amongst other seemingly unrelated ports, it has one audio port specifically labelled "stereo". I also have a separate audio system: a Cambridge SoundWorks FourPointSurround. It has a main box, then 4 smaller speakers (front left, front right, rear left, and rear right).
Problem? The audio system works through a separate 4-headed cable it apparently came with, in which 2 cables for the rear and front are plugged into the audio system, and the opposite 2 cables for the rear and front are plugged into wherever the sound is coming from. As of now, only the front OR the rear can fit into that stereo port on the projector. There must be some sort of middle-man device I can use to connect both the front and rear jacks to the projector's one stereo port. Thanks in advance!

Paul NZ · Jul 10, 2015

One usually cancels the other if you use it (If you plug something in the back it overrides the front ports)

Unless you install whatever drivers (like realtek I think) which will let you use both for different things in its options

ssddx · Jul 10, 2015

it sounds like you have a cable with 2 ends on one side (likely 3.5mm stereo) and rca plugs on the other side. it sounds like you have a quadraphonic sound system (4 speakers, front left/right rear left/right). it also sounds like your projector has only a single stereo 3.5mm output. correct me if i'm wrong.

it is impossible to get full quadraphonic sound out of that port. the best you will get is stereo, or stereo sound duplicated to both the front and rear speakers if you used a 3.5mm headphone splitter on the output jack.

if you wanted surround sound you will need to pull that from whatever source you have (dvd player, computer, tv, blueray player, etc). if it does not have any good jacks for connecting (except pc here) you might be able to use a 5.1 audio extractor for hdmi or optical (if you connect this way to your projector and if optical both devices would need to support 5.1 over optical) and pull audio from it for multi channel. i know they can do 5.1 and 2.1 but since quadraphonic is not as popular i'm not sure if it supports it or not.

madmatt30 · Jul 10, 2015

^ pretty much what he said.
Your projector only supports stereo out.
Use that to connect to the front inputbon the soundworks.

Checked the manual & if only front input is used it will do dual stereo on the front/rear speakers automatically.

That's the best you can have with that particular setup.

Daniel Cohen · Jul 10, 2015

ssddx :

EDIT: ssddx, if it helps any, there are actually four audio ports on the projector: two for audio in (right/left, but either port is seemingly too small for the two front/rear cables) and two for audio out (one digital, also too small for one of the front/rear cables, and one stereo, which is large enough for either one of them). On a side note, a headphone splitter sounds like it could work…

madmatt30 · Jul 11, 2015

I don't think you need a splitter mate.
You're only going to get dual stereo - left channel to left front/rear ,right channel to right front/rear.

Your speaker manual states that if you run a cable to either the front or rear on the sub (not both) it fills/splits the other channels automatically.

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Front and Rear jacks into one stereo port?

Daniel Cohen

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ssddx

Paul NZ

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ssddx

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madmatt30

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Daniel Cohen

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madmatt30

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