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sladd
Member
3028 Posts |
 Posted - 2002/08/28 : 06:33:17
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To: HiFi Forum – Sweden
From: James Shannon
V.P. Sales & Marketing
Transparent Audio
Date: August 27, 2002
______________________________________________________________________ Dear friends:
While the questions you asked could legitimately claim many pages of detailed response, we have tried our best to distill our comments into concise and clear answers.
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Forumfråga 1. What is the transferfunction of the filter. (In terms of poles and zeros under typical load- and source impedance conditions)
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1. We use low pass filters in our audio interconnects and speaker cables, since the bandwidth of the cable is far greater than the bandwidth required to pass the fundamentals and harmonics of the musical information. As most audio output circuits have very low output impedance, and most input circuits have rather high input impedance, we see quite consistent results from the filters we employ. All Transparent filters are first order, to ensure that there are no phase distortions introduced in the audio bandpass. Our filter designs offer flat group delay through the entire low pass region, and have a typical –3db point of 1 Megahertz. This is well beyond the audio region, but carefully eliminates much of the RF and other high frequency noise elements introduced by the antenna behaviour of all cables.
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Forumfråga 2. What physical properties of the cable may be regarded as "figures of merit"?
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2. Virtually every element of our cables has been thoroughly researched and tested with respect to performance. Everything matters---from the purity of the copper, to the extrusion and annealing processes; the composition, finish, thickness, density and placement of dielectric materials; the density and consistency of packing materials we use to support cable geometry; the geometry of the cable itself; the thickness and flexibility of the outer jacket; the component values and manufacturing quality of components used in the networks; the placement of the components relative to signal and to one another; the density and damping characteristics of the compound used to surround components; the materials, shape and resonant characteristics of the network box, the solder type and soldering technique; the quality and plating of the connectors; the electrical and impedance characteristics of the connectors, etc., etc. Every aspect of cable design makes a difference in performance, and we honestly believe we have spent more time, money, and sincere efforts in an attempt to uncover every possible design element which can affect performance.
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Forumfråga 3. What is most important and why - materials (conductors and insulation) or cable geometry?
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3. This question is impossible to answer as stated. If you understand the comments made in response to question #2, you will recognize that every element of cable design and materials affects performance.
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Forumfråga 4. Supra Audio cables have in a joint venture with Ben Duncan Research claimed measured proof of that cable directionality exists, and that the directionality originates in what direction the copper is last drawn at the factory. Have you at Transparent seen these results published anywhere and/or performed similar measurements and if so, what are your results?
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4. Many different factors in cable design (including component configurations within our network designs, and our termination of shielding) affect cable directionality. We print a directional arrow on the jackets of our cable to indicate proper directionality.
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Forumfråga 5. Do you perform blindtests or double blind tests when you develop your cables and what are the results?
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5. Every audio, digital and power cable undergoes a thorough range of single blind and (occasionally) double blind testing. This is a key element of our design process, and is a substantial reason for our confidence in the cables we bring to market. Every individual cost increment must yield objectively increased performance, or we will not present the product to our customers. Note: we perform similar tests with our video cables (i.e. the observer does not know which cable he is evaluating); for obvious reasons, we do not typically refer to these tests as “blind” tests.
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Forumfråga 6. How is it possible that as high frequencies as 1Mhz can make a contribution to our listening impression(s)? Does it affect the equipment or is the process actually taking place in the listeners ear. (What are the problems and how do you tackle them?)
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6. There is a significant amount of information above 1 Megahertz which can and does intermodulate with information within the audio frequencies; when this information is not properly filtered, it will create additive harmonic distortions which are clearly audible. Noises at any frequency can raise the noise floor, which has subjective relationships to dynamics as well as timbre of the musical information.
You did not ask, but it seems worth mentioning: many of the design features and characteristics which critically affect cable performance do not always correspond to the types of measurements most typically applied to cables. When any sonic test or series of tests yields repeatable and reliable differences between cables, but those same cables do not measure differently, we are simply measuring the wrong parameters. We have learned a lot about cable design during the 20+ years of Transparent’s existence; however, we feel confident that there is still much we will learn in the future.
I hope this is helpful information.
Cordially,
James Shannon
V.P. Sales & Marketing
- - Den som jämför med något sämre kommer aldrig framåt - - |
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n/a
deleted
1623 Posts |
Posted - 2002/08/28 : 08:42:32
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Hi s!
Quite impressive, in fact,- really impressive!!
Wkr A.
Edited by - Audiomaniker on 2002/08/28 08:44:4 |
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P.P
Ej medlem längre
38 Posts |
Posted - 2002/08/28 : 10:59:35
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P.P är också imponerad!
Förutom svaret på fråga 2 & 3 som är lite vagt så står här nästan bara vettiga saker och framför allt så svarar mr Shannon på frågorna!
Fantastiskt fint!
Tänk om ostfabrikanten hade kunnat prestera så fina svar???
N vs T : 0 - 1
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