Someone should kick me in the keester

I have mentioned this before...but another overlooked item that can cause serious sonic problems..is DC voltage on the ground pin of your AC outlets..usually caused by the cable TV feed into your home being grounded to the same earth ground as your electrical feed. Get a VTVM and measure the ground pin of an AC outlet(better yet have someone do it that knows what ther're doing)... Way put so much effort into having "clean power",..meaning the AC into your system, if the ground of that same AC is poluted with a DC voltage.

You can prove this to yourself, by going outside your home and disconnecting the 75 ohm coax comming into you home,...and the green ground wire that the cable company has strapped to that pipe....Then re-listen to your system..about 50% of you will be very surprised.

Check out some of the prior posts that deal with "ground or
grounding".

Best, Jim

Welcome to the "wire DOES make a difference with digital" club. I found this out simply out of necessity and kind of by mistake. I had purchased a DAC & Transport and thought i had a spare digital cable or two laying around. Well, when the gear showed up, i didn't have any spares. As such, i temporarily had to resort to using standard "non-digital" interconnects. Those i did have tons of, so i began to experiment.

I quickly found out that cables that had a definite "sonic signature" in the analogue realm carried that over to the digital realm. Taking this a step further, i began experimenting with different digital cables to find the same thing. 75 ohms or not, each had a slightly different flavor with various high and low points. I think that this may have more to do with reflected energy / vswr than anything else though. Just a guess though.

While i normally don't play "devil's advocate", i will on this one. Are you sure that "personal pride" is not playing any part of your "increase in system performance ? Have any of your buddies been able to tell a difference ? It's always nice to have an outside source verify your observations, especially if they have not been tainted with what to listen for. Sean
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Ezmerelda: A 75 ohm cable (true or otherwise:-) is not always needed for quality digital. My two best sounding digital IC's are neither. I am not quite certain as to how to measure the length of one of them as the Hot lead is 60" long and the Cold 30" (figure 90" or approx. 2.0 meters in the signal path). One IC is a Mapleshade Double Helix (this one is 1.0 meter) and the other is fabricated out of the 47 Labs OTA cable. Both are superior, IMO, to 75 ohm cables that I have tried (with some of these being very popular and costing a great deal more). I have never had decent results, for instance, taking a single standard analog IC and using it in this application, so there is something more involved in making a good digital IC, but I do not feel that it being 75 ohm is necessarily a part of it.

Ezmeralda - The cable I replaced was fairly generic RG-59 coax with relatively inexpensive audio RCA connectors -- likely not a 75 ohm connection. The new cable uses Belden 1506a coax with 75 ohm Canare RCA and BNC connectors. Its hard to say specifically where the differences lie, but in every area the new cable is certainly higher quality than the previous one. And, aside from an hour of my time, the total cost was about $20. Not a bad value.

Sean - You're right in pointing out that the improvements I'm hearing may well be manufactured by my overly swelled pride. As yet, I'm the only one who's listen to the system since yesterday so its tough to know for sure. However, the changes I'm hearing are not subtle, and the problems I've had in the past were very specific and easily recognizable. After a night and most of a morning's listening, I'm happy to say that many of the issues I've had have either been eliminated or significantly reduced, and the system is now overall much more enjoyable to listen to. To be certain, I have a few friends with reasonable ears coming by tonight, so I'll reserve final judgment until then.

To be specific, these are the changes I'm experiencing:

1) I've always had a problem with "unstable" deep bass - that is, sustained bass notes that would waver continuously in volume, and sounded "impure" - almost as if the tones coming out of each speaker were slightly different. My example for this is Arvo Part's I am the True Vine where the vocals are accompanied by steady organ pedal tones. With the new cable, these notes are both entirely stable and beautifully pure. This is a major improvement.

2) Complex musical passages, such as the last movement of Pictures at an Exhibition or Jupiter from The Planets have always been muddied to the point of being distorted. I had attributed this to deficiencies in the DAC, but having heard both of these pieces sound very nice with this DAC in other systems, I was a bit skeptical. Both of these pieces are now very clear, with the individual instruments being well defined and easily recognizable (including the giant bell at the end of Pictures, which is now actually a bell).

3) The placement of instruments and voices within the soundstage were often difficult to pinpoint, and when found would move about quite a bit. Now, not only are the positions of the musicians solid, but there is a well defined difference between being in the correct listening position, and being outside of it. Previously, changes in listening position made very little difference in the overall sound.

I'm willing to believe that what I'm hearing is all psychological and that objectively, things really aren't any different. If all it takes is an afternoon project and an over inflated sense of pride to improve my listening experience, well, I'll be happy to keep it up ;-). However, I'm inclined to believe my ears in this case and appreciate the difference that a better digital cable can make.

Thanks for all of your comments about my epiphany. And now that I have my soldering iron out (and another successful diy project under my belt), perhaps its time to take Brulee's suggestion and try building some better quality power cords. At the very worst, it'll keep me out of trouble for a while :-).

Thanks all,
Ken

Hi Ken; I'm glad to hear that such a simple change has made such a big improvement in your system. I can identify with your findings re digital cables. I now use a Cardas AES/EBU digital cable between transport and DAC (both Levinson). The Cardas is very "musical". The only other one I've tried is a Levinson AES/EBU, that I expected to be a very good cable for their own components-- not so-- it was detailed to the point of being analytical and PRaT was really poor. It was a simple change (and both cost about the same), but with the Cardas, the improvement in quality/character of music was huge. Thanks for sharing. Cheers. Craig