Digital Interface


I have been doing some research on trying to improve the sound quality from my PC to my DAC. I am pushing digital audio from my hard drive through the computer and also use Spotify through the computer often. I thought about possibly putting a digital interface, such as a "Singxer SU-1", between the PC and DAC. There is mixed information out there on if this adds much value. Anyone have success here?
4vintplay
It depends on your DAC. A properly designed DAC with excellent jitter rejection won’t benefit. Unfortunately most DACs aren’t properly designed. I would recommend a Schiit Eiitr as it is cheaper than Singxer and does the job!
I use the PS Audio LAN Rover between my computer and DAC and can only say good things about it. I use an OPPO Sonica DAC with Sabre chips and confess it has tightened up all frequencies especially the bass. I was also responsible for my friend getting one and he has the PS Audio Direct Stream DAC with the same benefits and no one would say these are not properly designed, or would they ?
@jim204

It is self evident that a DAC designed for high fidelity should reject jitter. After all, jitter is nothing new and if a $150 Schiit Eitr can fix things then it is self evident that the manufacturer of the DAC could improve their design such that band-aids were not necessary. If Schiit can do it so cheaply then so could the manufacturers a $2000+ DAC.
I have Win 10 on an HP Pavilion computer using a WireWorld Starlight 7 USB cables from Hard Drive to computer then to a Cambridge azur 851D DAC. Looks like the PS Audio LAN Rover is not to readily available at this point in time. Looked at the Schiit Eitr. Seems that Schitt's products have mixed reviews for the most part some plus some not. 
I'm not clear what you have right now.

How is the DAC connected?  If you are using a laptop, be aware those wall warts add a lot of noise to the AC. If it sounds better on battery power, you should definitely consider an isolator. 

Best,
E
I also want to know should I buy something like ultrarendu or raspberry pi to replace my gaming pc or not. There are so many product made for pc hifi sata cable, usb card, fan conector, etc. Also something called ddc to use in between pc and dac like weiss int204. It’s seems endless upgrade. I like the versatility of the regular pc (play games , watch movie) but the pump and fan noise is noticeable for my pc. Hard to decide
@shadorne 
It is self evident that a DAC designed for high fidelity should reject jitter. After all, jitter is nothing new and if a $150 Schiit Eitr can fix things then it is self evident that the manufacturer of the DAC could improve their design such that band-aids were not necessary. If Schiit can do it so cheaply then so could the manufacturers a $2000+ DAC.

I would love to think that a $150 DAC could eliminate jitter but that is just not the case. Jitter is an ongoing battle in all sectors of digital storage and carriers I'm afraid and none more so than DACs . I happen to use my computer as a Digital Audio Workstation and have invested very heavily in jitter busting software from Mark Porzilli of the Memory Player fame. The software was definitely not cheap but the limiting factor is always going to be the USB ports wich are attrocious for jitter.I have what most people would say is almost zero jitter inside my PC so how come DACs of all price points sound so different through it. The answer is I'm afraid jitter related so when I say the PS Audio Lan Rover makes a difference I do mean it. My friend has a PS Audio Direct Stream DAC and there is a definite difference between the Lan Rover being inserted and taking it away , it is cleaner with it in circuit. I have tried it on a few DACs as I have a good friend who is a HI Fi  dealer and he let me try it out on a few of his and much to his dismay he had to agree that it did make a difference and a few of those DACs were in the 3 to 7 thousand pound range. The only DAC that the jury was out was with the Gryphon Kalliope DAC which was neither better nor worse but that is an eighteen thousand pound unit. I have even seen PS Audio advertising their DAC with a Lan Rover hooked up to it.
@jim204 

So so we agree! 

The Schiit Eiitr is just a USB bridge to coax - so it probably will improve the PS Audio Direct Stream too.
 
DACs mostly all need a band aid to actually work properly but there is no reason they can’t work properly without / the Gryphon Kalliope being a good example!
Why not use a fiber optic cable?

Yes, there are several DACs on the market that have jitter reduction and re-clocking or re-sampling. These can be good if you have a poor digital source, but in the end they are just a "fix a crappy signal" solution. They will never as good as when the signal was clocked and transmitted properly in the first place.

The Singer SU-1 and the Schiit Eiitr are great devices for taking a USB signal and re-clocking / converting it to S/PDIF (which is closer to the original digital data and clock timing). These are good devices if you are limited to a laptop.

If you have a PC, I would recommend looking at a better audiophile USB card. Such as JCAT or SOTM usb cards (PCIe).

If you want to skip USB and use S/PDIF directly, the Asus Essence STX II card has a very nice S/PDIF output (I use this and it’s excellent). Or you can go all out and get the latest Pink Faun audio bridge with an S/PDIF plug-in module.