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In Reply to: RE: Yes - and no! ... posted by kentaja on May 31, 2017 at 17:32:06
Thanks one and all. I am fairly confident in the stability and clipping behavior of my m/t amplifier, the Music Reference RM-200 Mk.2. It puts out almost 150w at 4 ohms (from only a single pair of KT-88's!), and my small room (14' 3" x 13' x 8') minimizes the Tympani's power needs (employing bi-amping, a ss amp for the bass panels). No fuses it is!I already have the Cardas binding posts, I'm just waiting for the terminal plates to arrive from Magnepan. As Kent described, the T-IVa's former owner soldered his speaker cables directly to the speakers internal wires, which I am NOT going to do.
Edits: 06/01/17Follow Ups:
The difference in any electrical quantity between having the fuses in circuit and bypassed will almost certainly make no difference in perceivable sound quality. Expectation bias is a powerful psychological effect and it has resulted in many audio myths such as this.
If you feel differently, by all means perform a test. Have a reliable third party at hand to bypass the fuse with a heavy-duty jumper. Listen for an extended period with the third party connecting and disconnecting the jumper, but not telling you which state is which. In addition, they should randomly NOT change the state when they tell you they are actually doing so, in order that you do not key your expectations to a known state change. Have them log at least 20 instances to be sure it's not just lucky guessing, and track your judgement for each one.
If you can't determine at least 16-17 out of 20 instances, then you've only shown that there is no audible difference to you. Enjoy your speakers and focus on the other thing which causes meaningful differences in sound quality - the source material.
If you are able to hit 20/20 in a properly double blind test, then please document it and let us know. World fame awaits you.
You really don't need to evaluate this subjectively.
Simply put an oscilloscope across the fuse when playing normally and you will certainly not see nothing. So, even objectively, the fuse is altering the signal somewhat. That's a good enough reason for me to remove it.
There is also the fuse-holder and related wiring which may be marginal in some aspect.
Dave.
Not to mention that fuses are known to be non-linear at high current.
Whether this has an audible effect, I don't know, but it's certainly measurable.
"My name is Edith Ann and ....."
https://www.youtube.com/watch?v=jJMKupYF14I
Short-term A/B testing was proven to lead to inconclusive results years ago.
Edits: 06/02/17
ABX audiology tests are only useful to identify particular noises and distortion with very short simple signals like tones clicks tone bursts etc.. They are useless with music. Cognitively, as a test for the equipment rather than testing the listener's acuity, it is total nonsense. It is not structured to conform with how musical content is perceived and put to memory. Beyond telling if a piece of audio equipment is grossly incompetent vs. another, the ABX text is an engineer's bias and an incorrect supposition as to the way the hearing and audio processing work. All such evaluations must allow labeled listening - at no time is the listener to listen to a piece under evaluation without knowing (at least generically) what it is. Introduction of a "mystery" sample smears the differences between the particulars of the cognitive tree formed for each item by allocating the perceptual specifics of each unit into the other's cognitive tree.
Beyond grossly incompetent vs. useful, the ABX test is only capable of producing a null result. It is in itself a highly biased test design that disregards entirely how the test equipment (listener) works.
Functionally it is like having a monkey at the keyboard of the PC used to store measurements in the lab, assigning the measurements to files randomly to either item under test. It can not be a useful method to discern performance differences, it is entirely an engineer's conceit...
I find a big problem with long term is that it's not possible to accurately recall the details of what I previously heard, and also quite likely being in a different mood receptive to something else ....
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