Author Topic: 8 channel DAC MUST READ !!!  (Read 30088 times)

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Offline James

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8 channel DAC MUST READ !!!
« on: March 22, 2009, 09:47:44 pm »
I got it!

I finally figured it out!

The channel order is really weird with the 8 ch. USBGEAR.COM sound device.



wave track 1 --> white --> L front --> X
wave track 2 --> gray --> R front --> Y

wave track 3 --> blue --> center --> r
wave track 4 --> violet --> bass --> g

wave track 5 --> green --> L rear surround --> b
wave track 6 --> yellow --> R rear surround --> i

wave track 7 --> red --> L side surround --> L_audio
wave track 8 --> orange --> R side surround --> R_audio

Here's the tricky part...

The driver for this thing is not so good. When you play a wave, after it stops, it might leave some of the colors on. I have never seen this with any other sound card driver! If you have the Windows driver panel for this device open, you can switch between 6 and 8 channel mode (and back as necessary). This zeros out the non-stereo tracks. I guess this thing was made for audio and it has.... had decoupling caps... but GEEEEEEZ!

The output positions of b & i seem to be the reverse of what I would have expected.

Also worth noting
Also worth nothing is only one h away!

If you play a 6 channel wave, the information that comes from the rear surround channels also appears on the side surround channels!

THESE ARE THE AUDIO CHANNELS !!!

If you are using this device as a six channel laser signal + 2 channel audio DAC and you have stereo audio coming from what would be channels 7 and 8 in a wave you need to be aware if this !!!

More information to come as it is discovered.

Expect some minor corrections.

I added a feature to LaserBoy so you can convert 6 channel LaserBoy waves into 8 channel waves by putting silence in the audio tracks. That works fine.

James.  :)
« Last Edit: March 22, 2009, 10:43:46 pm by James »
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Offline BlinkenLights

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Re: 8 channel DAC MUST READ !!!
« Reply #1 on: March 23, 2009, 11:45:42 am »
ok im confused about 1 thing (for now)
Quote
If you play a 6 channel wave, the information that comes from the rear surround channels also appears on the side surround channels!

THESE ARE THE AUDIO CHANNELS !!!

Offline James

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Re: 8 channel DAC MUST READ !!!
« Reply #2 on: March 23, 2009, 01:40:47 pm »
If you play a wave that has less than 8 channels, you will NOT get silence in the unused channels!

So, if you use wave tracks 7 & 8 for audio and you play a wave that only has 6 tracks, you will be sending color signals into your stereo!

NOT GOOD!

James.  :)
« Last Edit: March 23, 2009, 01:43:24 pm by James »
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Offline BlinkenLights

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Re: 8 channel DAC MUST READ !!!
« Reply #3 on: March 23, 2009, 02:12:55 pm »
too bad its not x and y..

Offline James

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Re: 8 channel DAC MUST READ !!!
« Reply #4 on: March 31, 2009, 08:35:20 pm »
After some conclusive testing..... that took a lot longer than I thought it would!

I have some information to report about measurements I've made on my own laptop and 8 channel USB + LaserBoy Correction Amp.

I need some time to write it all up, but please be prepared to compare my findings with your own systems. Hopefully, we can find some consistency here!

A volt meter and a scope will come in really handy!

Oh yeah.... and this too!

James.  :)
« Last Edit: March 31, 2009, 08:38:13 pm by James »
LaserBoy is Sofa King Cool!
But it will never be Alpha King Done!

Offline James

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Re: 8 channel DAC MUST READ !!!
« Reply #5 on: April 02, 2009, 03:16:41 pm »
Check this out.

I made ramp into a full 8 channel wave and this is where I can set the individual channel levels so that each channel is one click below clipping.

James.  :)
« Last Edit: April 02, 2009, 03:18:13 pm by James »
LaserBoy is Sofa King Cool!
But it will never be Alpha King Done!

 

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