Someone should kick me in the keester


No matter how much I know and learn about audio, I can still be completely oblivious to some of the most basic things. Today I discovered a new dimension to that fact.

For quite a long time I've been complaining (privately) about the lack of detail, imaging, and overall clarity my system had, in spite of the quality of its components. I spent a bit of time swapping tubes, changing interconnects, and adjusting the speaker position without a great deal of success at cleaning up the sound or providing a solid soundstage to my satisfaction. While most of my friends couldn't hear the problems I described, I certainly did and it lead me to think that this might be as good as it gets.

A few weeks ago I decided to order some parts to build the Max Rochlin memorial digital cable, partly because I needed a project to keep me busy, and because it was the only cable in my system I had not yet replaced. I finally got around to building it this morning (for those that are thinking about trying it, it took me about an hour or so) and discovered after installing it that I had an entirely new audio system. The soundstage was right on the money and rock solid, the music was clean as a whistle (even through Moussorgsky's Pictures at an Exhibition), the bass tight, the midrange a thing of beauty, ... I could go on.

Anyway, it turns out that my suffering for the past year or so was due entirely to an inferior digital cable and nothing else. I had been very skeptical in the past about the differences a digital cable could make (bits is bits?), but I now stand both red faced and enlightened. I'm not entirely sure that I understand the physics behind the change I made, but it does seem that there are things about digital transmission that I need to brush up on.

Anyway, if confession is good for the soul, then let me be the first to give my spirit a lift :-).

For the record, the system is mostly CJ (17LS, Premier 12's, DA2-B DAC) with a Pioneer DVD as a transport.

-- Ken
kjg

Showing 3 responses by dekay

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.
Sean: The long portion is looped around the short one in seven half knots which are approx. 3" in diameter. No metal RCA's either (this is the one made out of the 47 Labs OTA kit which is 26 gage solid core copper enclosed in extremely thick Teflon isulation along with plastic RCA's). The cable exibits less "smearing" (by a long shot) over any traditional cable that I have used in this application. It can also be tuned (to a certain extent) by the location/spacing and size of the loops (the larger the loops, within reason, the more open and realistic the sound, but too large and you loose imaging). It's an ugly sucker, but it sure sounds good. The Mapleshade cable (not as good, but still no sluff) is also not a 75 ohm design, but is quite unusual as well in its construction.
Sean: It is a loose adaptation of a concept shared with me by Richard @ Vantage Audio. Their design (which I do not feel comfortable sharing) is of course much more refined than this "wing it" cable, but I really cannot thank Richard enough for his guidance on this project (I really enjoy his "out there" thinking). Oddly, I received an email which stated that other OTA user's had benefited by making the "Cold" lead a bit longer (just the opposite), but this did not pan out in my setup. Yes, I suspect that this is all system dependent and my intention was only to point out that one should not "limit" themselves when designing a cable. I don't feel that we really know enough about this "whole thing" to do so @ this stage in the game. Based on the EE comments that I have read @ AA the OTA cable should not function as it does, anyway, but it does in that it provides full frequency response from the LF's to the HF's (other 26 gage copper/Teflon cable that I have experimented with does not). Go figure. If three people were to "share" one of the kits @ $200 a pop, they would receive enough cable/RCA's to make up a single pair of 10' speaker cables and a set of 1.5 meter (or longer) analog IC's (each). I think that you would get a kick out of this product in one of your lower powered systems (don't know if I would want to pump 1000 watts through it though:-).