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Need help with Phonic Helix 18 Firewire Mixer!

Discussion in 'Converters / Interfaces' started by BrianMDPhD, Dec 7, 2007.

  1. BrianMDPhD

    BrianMDPhD Guest

    I've had this mixer in my studio for a while but I never actually took the time to get it completely up and running. This is due to the fact that I have had the same problem in the past as I am having now.

    A few certain sources when plugged into the Mic or Line inputs, will sound perfectly fine. However when I put different audio sources such as a laptop, desktop, TV, or iPod, the mixer produces a very poor quality output that makes the audio sound as if it were recorded in a hall, somewhat echoey, and as if the vocals and certain frequencies were "smothered". I have tried almost every setting and nothing seems to fix the problem, I have even tried all the inputs and outputs, nothing helps.

    Anyone have any ideas as to what is going on? Thanks in advance.
     
  2. bent

    bent No Bad Vibes! Well-Known Member

    How are you plugging in the problem sources?
    Which inputs, what type of cables and adapters?
     
  3. Boswell

    Boswell Moderator Distinguished Member

    Those problem sources you listed are all unbalanced. Are you sure you are connecting them correctly to the mixer inputs, which are almost certainly balanced?
     
  4. BrianMDPhD

    BrianMDPhD Guest

    I've tried the inputs on Channels 1-6, which have balanced XLR mic or 1/4" stereo line inputs using their respective cables. Although due to the variety of sources, short cables, and variety of inputs, I don't think that the impedance-balance is really the issue...
     
  5. bent

    bent No Bad Vibes! Well-Known Member

    Yes, but how are you plugging out of the sources and into the mixer?

    For instance, out of the Ipod directly into one channel with a single 1/8" cable & 1/4" adapter, or are you using something like this:
    (Dead Link Removed)
     
  6. BrianMDPhD

    BrianMDPhD Guest

    Yes I am coming out of the sources with a 1/8" stereo cable, which is then adapted to the single 1/4" line input, or with an adapter for the XLR. I have several of those cables you used in example, but I'm not sure where I would plug those into the mixer for multiple sources...

    ...but is this where the problem may be?
     
  7. bent

    bent No Bad Vibes! Well-Known Member

    Bingo!

    You are experiencing phasing and associated cancellation.

    The 1/8" output from an Ipod, for instance, sends Left information out on the Tip of the connector, Right is on the Ring, and they share the shield (Sleeve).

    When you plug directly out of it and straight into one XLR or 1/4" jack, you are combining both L and R information into one channel.
    Left to Pin 2, Right to Pin 3, Shield to Pin 1.

    With the Y cable (stereo Y, not a split Y - those split one signal into two identical signals) plug one into an open channel, the other into the next one in line (i.e. channels 1 and 2).
    Pan one hard left, the other hard right.
     
  8. bent

    bent No Bad Vibes! Well-Known Member

    I drew a pic for you:
    http://i234.photobucket.com/albums/ee277/bentsound/Audio Stuff/PhonicBoardwithIpod.jpg
     
  9. BrianMDPhD

    BrianMDPhD Guest

    Excellent! That clears a lot of things up for me, strange that it is set up like that for iPod like output signals, I never had this problem before because I only had a bunch of studio mics plugged in...

    I looked around and I don't actually have any stereo Y's like you pictured above, but I do have a few dozen of these:

    30s1-01160.jpg

    Think there is any way to adapt it to work?
     
  10. bent

    bent No Bad Vibes! Well-Known Member

    Yes, here ya go:

    (Dead Link Removed)

    RCA F to 1/4" M adapter, can be found at any Radio Shaft store.
     
  11. BrianMDPhD

    BrianMDPhD Guest

    Well yes I don't have any of those either, but I will be sure to pick up a bunch with my next order, I always get my parts in wholesale so at least I save something...but I guess I have figured out the problem, so thanks a lot for the help!

    I will order in the connectors the next chance I get and update in this thread. Thanks again!
     

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