up for discussion... balanced vs. unbalanced signal

scott_fx · 08-28-2006, 03:56 AM

so i have probably a unique situation here and i'd like to get some discussion started.

ok here is my issue. i have spent many hours on researching, purchasing, and adapting my system to use a completely balanced signal path. I have been doing a lot of research; as most of you know, on usb dac's and i'm wondering about if i'd be better off with a usb dac (namely the douglas nos usb dac: http://www.mp3car.com/vbulletin/show...ht=silverstone) over my soundcard. the major concern here is that the usb dacs are all unbalanced. I'm wondering how big of a hit this will make if the initial connection from the pc to the active xover is an unbalanced signal (after the active x-over it goes back to being completely balanced). the pro to this is the x-over and the usb dac will be inches from each other.

just for comparison purposes here is my set up:

via epia m10000
echo gina 3g (5v balanced) or the douglas usb dac (4+ volts unbalanced)
zapco sl-4 active x-over (balanced)
(2)phaze/butler tube amps (balanced)
(1)zapco 500.1 (balanced)

so please lets get some discussion started to help me. i have custom made my interconnects for everything but the 'soundcard' to the x-over. so this is the time to make my choice.

thanks in advance!
scott

Jahntassa · 08-28-2006, 08:17 AM

Well, as far as I was aware, the main feature of balanced audio was noise reduction, so I would think that having an unbalanced connection anywhere in the loop would make it more possible to induce noise between components.. But that's only based on my limited knowledge.

Just curious, but why are you thinking of switching to the USB DAC? I would think the rest of the components you have in that setup far surpass any USB solution..

scott_fx · 08-28-2006, 11:42 AM

you are correct about the benefits of a balanced system. so i'm hoping that if my dac is mere inches away from the x-over that i couild skirt around any induced noise.

the usb dacs that i've listened too (and research about) just add this seperation in the music. it's hard to describe but the usb dacs just step up the quality of the signal above anything i've ever heard.

Jahntassa · 08-28-2006, 02:28 PM

That's a bit odd, I would've thought the Gina (or anything else by Echo, i've used a Layla myself) would've been yards better. Though I suppose I can attest to some things, like my Edirol UA-30

scott_fx · 08-28-2006, 02:40 PM

hmm... i guess i should just audition the echo before i toss it aside. i guess i could bug my buddy with the micro dac and compare the two. YAY more cable making! :-)

scott_fx · 08-29-2006, 07:57 PM

in my talks with douglas (the creator of the usb dac that i've been telling people about) I may be able to audition one of these dac's and write up a review. he has a prebuilt unit with some nice burr brown opa2132 opamps which are supposed to be very warm and pleasant sounding from what i've read and what he's told me.

meddler · 08-31-2006, 05:44 PM

yes. please let us know how good it is.

scott_fx · 09-04-2006, 11:45 PM

so i went ahead and ordered a special usb dac from douglas with the burr-brown opamps. I'm building a home pc (mainly for web/media stuff) and will hook up the various soundcards that i have and give a comparison on the three.

the one's that will be under the spotlight are:
douglas' usb nos dac
echo gina 3g
m-audio audiophile 192

turbocad6 · 09-05-2006, 12:21 AM

hmmm, now you've peaked my interest, I know those burr brown op amps from back in the day as being extremely warm & sweet..... I used to sware by them, but most modern equiptment has gone optical, how does this solution you're working on relate to &/or compare to an optical into the h700?....

since the 700 I've got to admit I've just been accepting what I got, & haven't really considered other options, as much as I love my h700 optical setup, I do think my systems were warmer & more natural when I used to run a f1 status head, line driven into a pair of eqt's....

I always felt a slightly less rich & true sound was the tradeoff for the convienience of the h700... up until now it's been an acceptable tradeoff, for the convinences I get, but I'm thinking that the solution your looking at is more akin to what I'm more used to in real high end car audio..

what are you looking to use for eq tunning?

RedGTiVR6 · 09-05-2006, 12:49 PM

I'm interested in knowing the results of this as well.

And what you plan on using for tuning too

scott_fx · 09-05-2006, 02:16 PM

Quote: Originally Posted by turbocad6

hmmm, now you've peaked my interest, I know those burr brown op amps from back in the day as being extremely warm & sweet..... I used to sware by them, but most modern equiptment has gone optical, how does this solution you're working on relate to &/or compare to an optical into the h700?....

since the 700 I've got to admit I've just been accepting what I got, & haven't really considered other options, as much as I love my h700 optical setup, I do think my systems were warmer & more natural when I used to run a f1 status head, line driven into a pair of eqt's....

I always felt a slightly less rich & true sound was the tradeoff for the convienience of the h700... up until now it's been an acceptable tradeoff, for the convinences I get, but I'm thinking that the solution your looking at is more akin to what I'm more used to in real high end car audio..

what are you looking to use for eq tunning?

I just talked to him a bit more and he's going to switch out the cap with some blackgate caps. so that should just make it all the better! :-D

the usb v. optical comparison. the usb dac uses a non oversampled signal, there is no upconversion or anything like that so it should be a pure signal. the usb dac that douglas has designed probably will have a higher output voltage then the h701 as well.

as far as the tests and tunning, i will start another thread on how to set up this comparison. please chime in

scott_fx · 09-12-2006, 11:13 PM

it's on its way! douglas sent me a confirmation email that the dac was shipped out today. i'll give you initial impressions hopefully this weekend or next and then later when i get the install completed i'll give some in car feedback

turbocad6 · 09-12-2006, 11:18 PM

cool

RedGTiVR6 · 09-13-2006, 08:45 AM

sweet!

I'm looking forward to this!

scott_fx · 09-13-2006, 12:56 PM

just ordered my monitor headphones for the test too :-)

Beyerdynamic dt880! these things rock (and i can use them for work..tax write off. ha)