What is wrong with this graphic EQ??
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  1. #1
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    Default What is wrong with this graphic EQ??

    Hey guys,

    Normally this stuff doesn't present a problem for me, but I've run into a situation that has me pulling my hair out looking for an answer. I am slowly building a home studio/production station, and wanted to add an old DBX 31-band graphic EQ in between my computer and my home stereo I'm using as a monitoring system right now. I have a 1/8in stereo cable going from the computer into the TRS input of the EQ with a 1/8in-1/4in headphone adapter jack on the end. It's the same situation with the output. I thought initially that maybe I had a bad cable or a bad adapter and swapped both of those out. No change. It outputs sound, but it is only outputting to the left speaker in a mono signal. Doing a stereo test confirmed that it is only recognizing one speaker. The EQ is a DBX 131 model. I'm confused as to why it's putting out a mono signal when it has TRS (stereo) inputs and outputs. What am I doing wrong? It does this on both the computer and a standard mp3 player. I'm beginning to wonder if perhaps one of the jacks on the EQ has a channel busted.
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  2. #2

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    It's outputting a mono signal because it's a mono EQ. A 1/4" jack does not always equal stereo. Also that cable setup is going to give you trouble in the future, I'd suggest expanding your sound engineering knowledge a bit before investing in equipment.

  3. #3
    Tech Guru SirReal's Avatar
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    Model 131 description copied from the dbx website, http://www.dbxpro.com/131/ "Single Channel 31-Band Graphic Equalizer"
    "Walking the fine line between Stupidity and Genious" My Soundcloud ---- My Mixcloud
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    Tech Mentor Audeo's Avatar
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    The first step of building anything is knowing what you bought to start with.

    One trip in the Google magical search engine ride would've earned you +10 internets. Now you lose 50 internets due to not googling before asking.
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  5. #5
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    Quote Originally Posted by Shishdisma View Post
    It's outputting a mono signal because it's a mono EQ. A 1/4" jack does not always equal stereo. Also that cable setup is going to give you trouble in the future, I'd suggest expanding your sound engineering knowledge a bit before investing in equipment.
    I understand it's a mono signal, but I don't understand why it's still only outputting to the left. If it was a mono signal, wouldn't it just be putting out the same output to each speaker? This is what confuses me the most, because when it was originally setup in my mobile rig, it was sending a mono signal to each speaker (it was a stereo power amp too). Also, why would you include TRS inputs if it was outputting a mono signal? I know this isn't an ideal setup, I'm using this to hold me over until i'm no longer so strapped for cash; a "leftover gear" sandwich if you will
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  6. #6
    Tech Guru SirReal's Avatar
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    Professional gear uses balanced connections, ie, tip, ring sleeve or XLR. You may want to do as Shishdisma says and research audio because from the sound of some of your statements you might just blow something up or shock yourself. There's some great books out there about audio reinforcement, cabling and such or just use the internets.
    "Walking the fine line between Stupidity and Genious" My Soundcloud ---- My Mixcloud
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  7. #7
    Tech Mentor Nick V's Avatar
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    Notice the difference between the grey and red headed cabels here (two mono inputs) and the black with the extra ring it (stereo). If you want the former you will need one of these

    3683_small.jpg

  8. #8
    Tech Guru SirReal's Avatar
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    @ Nicky, it's still not going to matter because the eq he has is a mono eq, for one channel only.
    "Walking the fine line between Stupidity and Genious" My Soundcloud ---- My Mixcloud
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  9. #9
    Tech Mentor Nick V's Avatar
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    Quote Originally Posted by SirReal View Post
    @ Nicky, it's still not going to matter because the eq he has is a mono eq, for one channel only.
    Tha's why I'm saying homie needs a splitter if he wants mono 1/4" to stereo
    The whole thing is probably a bad idea if we're talking production but thats just IMO

  10. #10

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    Quote Originally Posted by Nick V View Post
    Tha's why I'm saying homie needs a splitter if he wants mono 1/4" to stereo
    The whole thing is probably a bad idea if we're talking production but thats just IMO
    The generally accepted term (in my experience) is a Y cable. Going back with a practical example of what I said earlier about learning: any kind of setup involving a stereo-mono-split mono setup typically requires summing. Under no circumstances should you ever sum with a Y cable. Use a summing/DI box/mixer, or mono the sound output in software. You WILL fry your shit if you use a TS Y cable backwards.

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