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y1 gamma-1 DAC - Page 34

post #496 of 1535
3/5/09 at 12:21pm
I agree with the others, this sounds like the pc 'being weird' and not the gamma1.

I can't think of a single explanation for why one input method (usb) would sound diff than another (spdif). there is no eq-ing going on in the dac and noting to change freq response based on input type.

for grins, if you can, try to locate a linux boot cd (ubuntu for example) and see if you can verify the hardware entirely without windows. the linux box should see the audio 'card' but NOTE! do NOT us a usb hub when you use unix and a usb sound card! that's a known problem for some reason (hubs interfere). go direct to the back panel of the usb port, plug nothing else on that usb segment and see if linux has that 'bass problem' via usb or spdif.

I'm willing to bet there are windows settings that are not 'cleared'. you could also trying going to the control panel in windows, deleting the device, removing it from usb, rebooting, reconnect the device and let windows rediscover it. that sometimes fixes 'stuck settings' inside windows sound system.
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post #497 of 1535
3/5/09 at 5:39pm
I wish i could get balanced output from this thing! I dont want to see it go so soon
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post #498 of 1535
3/5/09 at 9:04pm
I just turned all the system volumes up to 100% and now both files give 1.58V RMS on both USB and SPDIF. The thing is, unless I'm really losing my mind, the bass is not nearly as present in SPDIF. I'm running it through a strain diy tube amp to HD 600's. My SPDIF source is an m-audio audiophile 192, and I also tested onboard spdif to make sure the card/driver wasn't messed up. I don't have a problem with just using USB, but I'd like to figure out what's going on (although it mathematically doesn't seem like anything is wrong )
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post #499 of 1535
3/6/09 at 6:12am
dude_500, I think are are losing your mind.

Iif you look at the schematic diagram, you'll see that in the γ1 full config, after USB audio gets converted to S/PDIF by the PCM2707 chip, it feeds into the CS8416 receiver chip just like the coax and optical streams. There is no difference in circuitry between the three inputs from that point on. And as mentioned before, there is nothing in γ1 that would cause any bass loss, and your measurements now clearly confirms this.
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post #500 of 1535
3/9/09 at 10:14am
hey guys, anyone got any spare multilayer ceramic capacitor X7R 10nF 50V for C15D, C16D? I need 2 one for each of these assignments. sux to be so close but so far; only found some time to do some work on it last night to find I was still missing them. could order I guess, but i'm sure i'd get stung on shipping and thats even if I could place an order for such a small amount. I can paypal money for postage and a bit for your time. It would be sent to australia though,, but i'm sure such a small thing could easily just be dropped in a letter. thanks in advance

cant wait to get this thing up and running; everything is in place for casing and battery power abnd my iriver gets here in a couple of days
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post #501 of 1535
3/11/09 at 10:34am
I guess not
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post #502 of 1535
3/11/09 at 8:13pm
Quote:
Originally Posted by dude_500 View Post
I just turned all the system volumes up to 100% and now both files give 1.58V RMS on both USB and SPDIF. The thing is, unless I'm really losing my mind, the bass is not nearly as present in SPDIF. I'm running it through a strain diy tube amp to HD 600's. My SPDIF source is an m-audio audiophile 192, and I also tested onboard spdif to make sure the card/driver wasn't messed up. I don't have a problem with just using USB, but I'd like to figure out what's going on (although it mathematically doesn't seem like anything is wrong )
I think I've had something similar. Found a coax cable and decided to try it instead of the USB. Actually I was about to run a PC game, so I connected SPDIF and laucned that game. What I've heard was some lower volume and either low on bass or low on highs sound, plus rather annoying delay. Its easier to see/hear in game when sounds usually match some visuals. So I immediately returned everything back to USB.

Now I think that effect was because PC onboard audio is like 5.1 or 7.1 ch card and USB audio is pure stereo. When game plays via 7.1 card - some downmixing has to happen to make it sound as it was supposed to on the stereo headphones. I don't have full onboard audio card software installed so I have no control to configure card to convert 7.1 sound to stereo before sending it out via SPDIF. At least I think that is my problem with game audio. Now with stereo music file downmixing should not matter. But if you were playing some DVD audio track or other multichannel... I should give that coax another try with music via onboard audio and discrete audio card that I have more conrol over.

But foobar asio music plays fine with y1 and spdif
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post #503 of 1535
3/12/09 at 4:30am
Alright guys, here's the deal. I have an xbox 360 with optical out that I would like to utilize, and a pc that i would like to use through as well. Will this dac allow me to get sound from both sources? The 360 outputs Dolby Digital stereo, wma pro, and dolby 5.1. will this dac be compatible with dolby digital stereo? Both sources have usb for power. The dac would then feed into my tube preamp, and out from there.
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post #504 of 1535
3/12/09 at 4:49am
I used an Xbox 360 to test the optical in on my y1. So long as you set it to stereo mode rather than any type of surround sound, it seems to work well.
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post #505 of 1535
3/12/09 at 4:53am
Lingwendil, γ1 supports S/PDIF (and AES3, IEC-60958, EIAJ CP1201 extensions). See the "Specifications" section of the γ1 website. It does not support Dolby Digital, dts or other surround sound/video formats.
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post #506 of 1535
3/12/09 at 9:25am
Quote:
Originally Posted by Beefy View Post
I used an Xbox 360 to test the optical in on my y1. So long as you set it to stereo mode rather than any type of surround sound, it seems to work well.
often, look for the word 'raw' and pick the other option

raw means sending out dts and dd5.1 in multichannel spdif format. you want 'stereo mixdown' or something to that effect that *converts* the multichannel down to 2ch stereo.
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post #507 of 1535
3/12/09 at 5:10pm
Hi all,

I must say i am very interested in this DAC.
I am sorry if the following is already replied to but its a long thread

How would this DAC work with a iriver (i)hp140 and optical out with a mini3?
Would it be a great improvement to when not using a dac with iriver and a mini3?

Thanks for your time

Best regards
Erik
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post #508 of 1535
3/13/09 at 12:59am
I have happily used this combination: iRiver HP120 with lossless rips > optical cable > Gamma-1 DAC > Mini3. I also configured a rechargeable battery pack with a voltage regulator and an appropriate plug to power the Gamma-1, for off-the-grid bliss (though I rarely ended up needing the battery power). I think I posted details much earlier in this or in the Headwize Gamma-1 thread....
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post #509 of 1535
3/13/09 at 1:40am
Quote:
Originally Posted by Beefy View Post
I used an Xbox 360 to test the optical in on my y1. So long as you set it to stereo mode rather than any type of surround sound, it seems to work well.
That's great, just what I was looking for. The 360 outputs digital stereo, and I've got a tube-based matrix surround decoder in the works as it is, so this dac is on my to build list. Thanks guys!
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post #510 of 1535
3/13/09 at 5:44am
Quote:
Originally Posted by royewest View Post
I have happily used this combination: iRiver HP120 with lossless rips > optical cable > Gamma-1 DAC > Mini3. I also configured a rechargeable battery pack with a voltage regulator and an appropriate plug to power the Gamma-1, for off-the-grid bliss (though I rarely ended up needing the battery power). I think I posted details much earlier in this or in the Headwize Gamma-1 thread....
Great thx for the reply,
Then i am to save up some money and build me one of these

/Erik
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