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PostPosted: Sat Feb 04, 2006 6:31 pm 
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Lava Boy
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still don't know why the noise was always in the left monitor G channel out. What I am amazed at is how I can connect the Motif directly to my monitors and there is no problem with distortion, no matter where the gain is set.


That is odd (the left channel only thing) and while I am no electrical engineer I would suspect the range of levels within the designed tollerance range differs between your powered monitor inputs and tge recorders inputs. (Levels in this context include impedance, strength of signal and line level versus -10 / +4 inputs etc etc.

Many monitors include pads on the inputs to protect blowing expensive speakers. Preamps ideally keep as little in the signal path as possibel and high end ones will include switchable pads.

I know the signal path in the G is still puzzling to me with at least two or three places internally on the screen where you can turn attenuate the inputs at the start of the signal path and increase or decrease gain after the EQ and Comps before going on the the stereo outs. This appears to be all in addition to the physical knobs and sliders.

My best guess is perhaps either;
1. One of the electronic preamp inputs was less tollerant of a hotter signal that another.
2. The non distorted signal was perhaps attenuated a little more than the distorting one.
3. The presets in the Moitif sent out a slightly hotter signal on one side.

Either way you have had your first experience with "gain staging". Part science, part art and part black magic voodoo science that does not follow what should make sense.
http://www.rane.com/note124.html

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PostPosted: Sun Feb 05, 2006 12:32 am 
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Boot Polisher

Joined: Mon Nov 08, 2004 6:11 am
Posts: 97
Yes, I do not understand. Perhaps I would if I played around with a multimeter and tested the monitor circuits. My guess is that there is a component in the left channel that is not within tolerances low enough to handle the signal as well as the right monitor circuit.

Yamaha Australia gave me a bonus five-year warranty during their G sales drive. I suppose a noisy monitor channel constitutes a fault? If I lived close to an authorized Yamaha service center I would have them test my unit.

The Motif is not the cause of the noise as I have tried other keys and I get the same noise.

I am now happy to have upgraded my monitors in my quest to eliminate this scratchy noise coming out of my music machines. When I crank up the Motif the ASP8 Events are much richer than my Wharfedale 8.2a's. I now use the Wharfedales for mixing at my computer using Cubase, and finally I listen to the CD I mix on my computer through the Events.

And I am only beginning to scratch the surface of what I want to accomplish, recording wise.


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