or Connect
Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs. M2Tech hiFace
New Posts  All Forums:Forum Nav:

USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs. M2Tech hiFace - Page 98  

post #1456 of 1712

How hard would it be to make a convert have a built-in male rca or bnc that plugs into a dac? It may need support underneath, but means less connectors.

post #1457 of 1712
Quote:
Originally Posted by punk_guy182 View Post




It makes incredible sense to me too. Which adapter is that and is it 100% 75ohms?

I'll try and ask some DIYer if he can swap the female BNC for a male one instead but I have to find someone who can do it for a reasonable price.


You should be able to get female to male BNC connectors. 

post #1458 of 1712


 

Quote:
Originally Posted by jkeny View Post

I've been off-air for a while.

 

My take on all this is that the digital cable would seem to be more important sonically than the USB cable. Obtaining the best SPDIF signal quality is important to sonics & this is best achieved by avoiding or minimising the effect of signal reflections. I went through a debate with Dan Lavry on this & I finally came down on his side in the argument over short versus long SPDIF cables. I believe a good quality back to back BNC adaptor of the sort mentioned here will probably be the best solution as it should provide a true 75 ohm impedance in as short a connection as possible thus minimising reflections & their effects.

 

This is not something that the cable vendors are going to want to hear (or will probably admit to) but from my level of technical knowledge at the moment, I believe this is the best solution.

 

Long SPDIF cables will also work but there are more variables to get right in this scenario.

 

slim.a, remind me again of the details, did you use a 5V supply on my modded USB cable & found no advantage to this configuration versus a stock extension cable with the 5V power coming from the PC? I always said that this was a 5% improvement (if that) & was dependent on the quality of the PC PS Vs the quality of the external 5V supply used. Can you give some details of both sides of this equation in your set-up?


Hi jkeny

 

I understand the discussion and have read the various arguments, but wouldn't logic predict that the HiFace developers had the option of plugging the HiFace into either the computer with a long coax cable or into the DAC with a long USB cable and chose  the one that sounded the best?

 

USG

 

post #1459 of 1712
Quote:
Originally Posted by upstateguy View Post


Hi jkeny

 

I understand the discussion and have read the various arguments, but wouldn't logic predict that the HiFace developers had the option of plugging the HiFace into either the computer with a long coax cable or into the DAC with a long USB cable and chose  the one that sounded the best?

 

USG

 

You're making a lot of assumptions in that statement :) There are compromises in almost all products & I could point them out in the hIface BUT they probably did meet their design goals - was this one of them?

 


 

post #1460 of 1712

I will be getting a range of "special" BNC adaptors to test shortly which should improve the sonics of the Hiface yet again BUT there is a limited supply so don't ask me for one. These adaptors use a trick which will work perfectly with the Hiface & will solve a number of problems about cables making it possible to have less regard for the cable length or quality even allowing BNC to RCA without penalty. I will post on my website when I have tested & settled on the correct one in the range.

post #1461 of 1712
Quote:
Originally Posted by jkeny View Post

I will be getting a range of "special" BNC adaptors to test shortly which should improve the sonics of the Hiface yet again BUT there is a limited supply so don't ask me for one. These adaptors use a trick which will work perfectly with the Hiface & will solve a number of problems about cables making it possible to have less regard for the cable length or quality even allowing BNC to RCA without penalty. I will post on my website when I have tested & settled on the correct one in the range.


That's very good news. I however think that it would be better to swap the BNC fema loutput for a male one instead. That way dinstances are minimized and there is no use for adaptors that can degrade SQ.

post #1462 of 1712

How will you lock the hiface to the ref 1, by turning the hiface ?

 

when the manufacture like Amphenol sells such product, isnt that they have already lab tesed it to confirm it is 75ohm ? checking on the specs and found VSWR? is it important factor ?

post #1463 of 1712

I just picked up a $1.38 shipped BNC "Male to Male" adapter from seller dreambestbuyeu

 

Last night I tested running a USB extension cord with the Coaxial cable and my ears couldn't tell any difference, however, I'll continue to do some more testing with various kinds of music & different length extension cables before getting this adapter.

post #1464 of 1712

What about a US supplier for a female-male USB cord that meets the USB spec's (decent qualit,  thinking under $30.) ?  This is th last item I am waiting on before performing my mega  budget mod which I will photodocument in this thread for all the cheap bastards like me.

 

 

Ordered this one:

 

http://www.l-com.com/item.aspx?id=5735


Edited by regal - 6/7/10 at 5:55am
post #1465 of 1712

regal, that 20 awg power conductor sounds very nice, but if you want amazon free shipping ($25 minimum order) this may be an option, I have dissected some cables to go cables and they look good to me http://www.amazon.com/Cables-Go-26686-Female-Extension/dp/B00006HSML/ref=sr_1_1?ie=UTF8&s=electronics&qid=1275917567&sr=1-1

 

specs: http://www.cablestogo.com/product.asp?cat_id=1512&sku=26686

 

I saw it says not 2.0 compatible on official website, and some people saying they are, and someone speculating cables to go has different suppliers :p I think you should go with the one you found instead of taking a chance with this one which cables to go says isn't 2.0.

 

I look forward to your mod :p past few days I've been looking into a converter or sound card to output coaxial/bnc, and think I will want to do ghetto nimh battery power source.

 

What's the best places to get cheap 7-10 feet BNC cables?


Edited by haloxt - 6/7/10 at 6:50am
post #1466 of 1712


 

Quote:
Originally Posted by haloxt View Post

 

What's the best places to get cheap 7-10 feet BNC cables?


Blue Jeans cable. http://www.bluejeanscable.com/

post #1467 of 1712
post #1468 of 1712

Digi-Key has the Male/Male adapters.  I only saw 75 ohm ones, (Pomona and Amphenol branded.)  I didn't see any BNC-Male -> RCA-Male (yes impedence mismatch, but you can use it to connect BNC hiface directly to an RCA spdif female jack on your DAC.)

 

According to wiki you can occasionally tell if it's a 75ohm BNC instead of the old 50ohm connectors. "The 75 ohm types can sometimes be recognized by the reduced or absent dielectric in the mating ends"(wiki)

 

I don't know how much the cheaper quality materials (steel, brass, whatnot.) makes a difference.  Or whether the dielectric will make a difference (it's such a short run, I'd imagine it'd be minimal vs. a long run of cable.)[of course I'd prefer foamed teflon or air.]  Reflections could be an issue, I'm just curious if the cons outweight the pros.  Lavry commented on a shorter cables being better, but that he in no way was necessarily advocating zero length cables XD.

 

One could of course replace their dac connector with a male connector to directly interface with a hiface or vice versa which would reduce the # of signal transitions if that even has much of an effect.  I'm rather enamored with this idea b'c it of course cuts out the need for a long spdif cable (although if I _had_ to get a digital cable, I'd probably just pick up a Belden 1505a that you can have custom terminated for you for $20 (bnc/rca Canare connectors) and is only possible because the HiFace is so damn small.  I think EnjoyTheMusic reviewed it as the "http://www.enjoythemusic.com/etmcable.htm" Max Rochlin Memorial Cable.

 

The only other thing I'd prefer to add on would be shielding for the usb/power cables (or the entire device as the hiface is easily shield-able due to its size.  I get massive interference when my cellphone is getting text messages (I only have <20% bars reception in my cubicle) + lots of open unshielded computer systems.  If I did that, I'd probably go shield my interconnects per Jon Risch's suggestions for his Beldin 89259 diy twisted pair interconnects (foamed teflon spaced RF shielding grounded on source and capacitor connected on preamp/amp end.)

 

I was curious has anyone tried or know problems with trying to use the newly released Nickel Zinc rechargeable batteries (1.7-1.8v) to power the 1.8v sections of the HiFace (alas only the sub-c cells have the super low internal resistance.)

post #1469 of 1712
Quote:
Originally Posted by punk_guy182 View Post




That's very good news. I however think that it would be better to swap the BNC fema loutput for a male one instead. That way dinstances are minimized and there is no use for adaptors that can degrade SQ.


You miss the point - this adaptor will not degrade the sound , in fact it will enhance the sound & not just because it's short but because of another trick that I'll keep to myself until I've tested it. This trick will reduce the effect of cables & adaptors in the signal path & reduces the effect that reflections will have. Should be interesting :)


Edited by jkeny - 6/7/10 at 4:11pm
post #1470 of 1712

[ 3rd edit, sorry the following was written previously because I thought your reply was to me Jkeny, whoops sorry! =D ]

I meant as replacing the RCA female on the DAC with a BNC male.  Thus, a BNC Hiface can connect directly to said DAC with no cable nor even an adapter.  If one makes sure the DAC BNC male is 75ohm and (assuming) the HiFace BNC is 75ohm.  You'd have no impedance mismatches except for those on the circuit traces/wires or whatnot.

[ /end 3rd edit  ]

 

[ edit 2 ]

Note: the Rochlin Memorial cable, the original author had subsequently revised it and recommended Eichmann plugs on the RCA* end, which although they have a plastic shell in RCA form, the connectors are much smaller than the outer shell which reduces the impedance issues due to the still remaining impedance mismatched connector geometries.

[ /end edit 2 ]

 

_______________________

* Provided that the user was not swapping out the RCA female with a BNC female mount.


Edited by neibwe - 6/7/10 at 4:16pm
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Dedicated Source Components
This thread is locked  
Head-Fi.org › Forums › Equipment Forums › Dedicated Source Components › USB to SPDIF converters shoot-out : EMU 0404 USB vs. Musiland Monitor 01 USD vs. Teralink-x vs. M2Tech hiFace