Question about Phonic Helix18fw 18 Channel Mixer with Firewire

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I get a distorted sound from my speakers throug a Phonic Helix Board. It is connected on a PC through Fire Wire. The distortion is also there while using microphones or other inputs (CD-players etc.). It worked fine for a year... There's no Left/Right led indicator while playing music, the "solo" buttons don't seem to work. I have tried to hook up a new poweramp, new speakers etc. nothing seems to work.... Please help me, I need this mixer very bad.... Thank you Ton Wanten The Netherlands.

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Hallo landgenoot ;)

It seems it is a power supply problem; distorted sound, no meters, solo buttons not working, headphones low level and distorted. One of the power supply voltages might be too low or even missing. The Helix series mixers use mainly 4 supply voltages: + 15 V and - 15 V for the analog part (audio), + 5 V for the DSP and logic and +48 V only for the phantom power. If for example the + or - 15 V is too low, clipping of the positive or negative parts of the waveform (dependng on which voltage is too low) will occur. If possible, first measure the voltages coming out of the power supply. You could use a metal part of a jack as ground reference.
For the FireWire board an extra voltage supplied by the switched PSU is used. It is specified as +12,2 V, but I measured 14 V. This voltage is lowered to + 5 V by a resistor on the FW board and a 7805 regulator. (Not very efficient!) But as far as I can see, the FW voltage is not the problem here. I have some service documentation of the Helix series mixers (12, 17 and 24, so if you need more you can conatct me: frankdevries [at] versatel.nl.

Groeten, Frank.

Posted on Jan 05, 2013

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The helixboard was returned to the factory... they fixed the problem: by sending me a new one :)

Posted on Jan 06, 2013

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SOURCE: pc not recognizing phonic helix 18 universal mixer

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SOURCE: Phonic Helix Board sound problems

You don't specify which model Phonic mixer in question.
Is it a powered mixer ? And are you plugging your speakers into the speaker outputs ? If it's not a powered mixer and you're plugging speakers into the Line Outputs, you're not using a power amplifier between the line outputs and your speakers - this won't work.
If it is a powered mixer and you are plugging speakers into the speaker output connectors and still getting little or no sound, check your speaker cables and the speakers themselves by plugging them into known good amps.

Posted on Aug 01, 2009

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