Slow speaker cables?

B_Limo,

Getting back to the real world, Al, Alex and David, thank you! The goal is to get the music from the source to and out of the speakers as accurately as possible. That's the ideal senario so that the music as it was recorded is portrayed as it was recorded. I remember conversations that I had with Chris Sommovigo (Stereovox) and Darren Censullo (Avatar Acoustics) years ago.

Chris said that everything in a cable or component is important. You can have the most perfect transmission wire and connectors in cables, but if the connections between the wire and the connectors is lacking, you're hosed. It's simply, the chain is only as good as the weakest link .

Darren said that the transmission of the music from the source to the speakers can only be degraded, there is nothing that can be added to the original signal to make it more accurate than the original signal.

Anything that masks the original signal can be classified as some form of distortion. It may be tubes adding harmonics (warmth) that really aren't there in the original recording. It may be other things like RFI or EMI interference adding noise perceived as sound and masking important aspects in the original signal. It may be small things like solder connections interferring and not passing the signal correctly. And like Al said, inductance, capacitance and resistance can have the effect of slightly altering the musical signal.

Chuck

B_Limo,

Getting back to your original question. Yes, your brain does have the ability to recognize millisecond differences in what you hear.

Think about hearing a guitar string or key on a piano that is just slightly out of tune. The wave is just a hair off (shorter or longer), but you recognize that it is off, that something just isn't right about the sound.

Chuck

Some of the best sounding amps have limited bandwidth. I don't understand how greater high frequency extension="faster". Is it not rise time that ultimately determines the perceived speed of the amp at the upper end of the scale? Not taking you to task Al.
As far as cable speed goes, I once picked up an old Yamaha TT that looked like an upper end model back in the 80's. Nice precision tone-arm. When I tried it out, I could hardly believe how sluggish it sounded. Also no extension either way. Almost like AM radio. When I stripped some of the fine wire in the tone-arm, it was so tarnished it was dark brown. I rewired it and it then sounded great. I may have answered my own question but I'm not sure how.

I think you are referring to the decay of the sound. The room design also plays a role so different frequencies can decay differently. It's hard to tell if the speaker cables can affect the "speed" of various frequencies differently, like you said this is in the order of milliseconds, before sound production. Yet cables, just like all other components, do have the fast and slow characteristics.

12-11-12: Csontos
Some of the best sounding amps have limited bandwidth. I don't understand how greater high frequency extension="faster". Is it not rise time that ultimately determines the perceived speed of the amp at the upper end of the scale? Not taking you to task Al.

That is a legitimate question, Peter.

First, bandwidth and risetime are intimately related. Oversimplifying somewhat, the greater the bandwidth the faster the risetime.

But what I was referring to was primarily greater high frequency extension within the 20 kHz audible spectrum. Under some circumstances speaker cable inductance can produce an audibly perceptible rolloff of frequencies that are within that range. Particularly, as I said, if the impedance of the speaker is low at those frequencies. Electrostatics, for instance, commonly descend to the area of 1 ohm at 20 kHz, as I'm sure you realize. The inductive reactance of a speaker cable (inductive reactance being the inductive form of impedance, which is measured in ohms and is proportional to frequency), can be a significant fraction of that value at upper treble frequencies, particularly if the cable length is long and/or the cable does not have low inductance per unit length. The voltage divider effect resulting from the interaction of those two impedances will, to at least a small degree, roll off the upper treble.

Rolloff of the upper treble will, of course, tend to be perceived as sluggish transient response, and probably dullness as well.

Bandwidth limitations beyond 20 kHz, either in the amplifier or resulting from the interaction of cable inductance and speaker impedance, may also have audible effects, due to phase shifts of audible frequencies that will increasingly occur as bandwidth is reduced. That is one reason, btw, that amplifier bandwidth needs to extend considerably beyond 20 kHz.

Another factor necessitating bandwidth margin in the amplifier is, I believe, minimization of feedback-induced TIM (transient intermodulation distortion), if the amplifier uses feedback. Transient response that is sloppy and distorted as a result of TIM might also contribute to a perception of sluggishness, but that gets into amplifier-related matters that are not germane to this discussion.

Best regards,
-- Al