Do materials alter frequencies and speed?

Rsbeck: We've been through this before. The test results published for frequency response do not take into account impedance variations whatsoever.

As i've posted before based on figures extrapolated from the data that they provided, "zip cord" can introduce very measurable treble roll-off starting within the upper midrange / lower treble region on some speakers. Your refusal to see or acknowledge this potential problem, yet quote the same crap over and over again, makes me question your agenda.

The fact that you keep promoting zip cord yet chose other wires to run in your own system speaks volumes in itself. Make us proud and put your money where your mouth is. Doing so and selling your "fancy cabling" will buy you another couple of discs and tell us that you really do believe what you post. Saying one thing and doing something completely different doesn't set much of an example, nor will it sway anybody to believe what you are promoting. Once you swap those cables out of your system, you can keep telling yourself that it sounds exactly the same and that you are happy with your decision. Sean
>

Sean -- sorry, buddy, but you know I don't care about your "roll-
off" that happens outside the range of audibility so it doesn't matter
how many times you bring it up, it ain't like fine wine and it doesn't get any
better with age.

In fact, it is the exact kind of half-truth I am talking about.

I challenge you to present the facts honestly and do not leave anything out.
Every time you talk about this "roll-off," I challenge you to post
the truth -- that it is outside the range of audibility. I think that is a pretty
important point.

I posted a reference to a whole chart of cables I do not own, but I am not
allowed to mention the Zip Cord listing? Not allowed to say anything good
about Zip Cord? Who made that rule? You?

Finally, next time, don't just reference what YOU wrote last time -- try to
recall what *I* tell you each time you bring up the bogus "roll-off" -- that
way, you can expect me to have the same answer as before.

Save us both time.

Rsbeck - you can see plots of measured and computer simulated response of ZIP cord versus my speaker cables at this website:
http://www.empiricalaudio.com/frclarity7_electrical_performance.html

The simulated and measured are both obviously rolling-off with ZIP and have different phase response. The only issue is whether this is audible or not, and based on my listening tests, it is. My cables must be doing something right as they were favorably reviewed in April Sterophile, and I might add that I have never put any ads in Stereophile.

Steve N.
Empirical Audio
Manufacturer

>>The only issue is whether this is audible or not,<<

I appreciate this bit of honesty -- you seldom see this mentioned.

The graph on your web-site confirms that this "roll-off" happens waaaaay
outside the range of audibility.

If you have DBT or ABX listening tests to back up your claim that people can
hear this, I would be most interested in seeing that data because it would
shock the scientific world.

I also appreciate that you've identified yourself as a cable manufacturer.

I suspect there are many people in cable sales who frequent sites such as this
and do not identify themselves as such.

Some reality ---

The psycho-acoustic data shows that for pure tones at 16kHz the smallest average detectable difference in level is 3.05 dB. The findings were based on individuals 20 to 24 years old that had normal hearing to 20 kHz.

"Speaker cables: Measurements Vs Psycho-acoustic data," Audio, July 1994