Cela montre quoi ? Que vos câbles ne sont pas rigoureusement identiques en longueurs, que les connecteurs sont différents, que les conditions de mesure ne sont pas rigoureusement identiques,…?
Prenez vos deux câbles différents mettez les sur un banc de mesure et comparez les courbes en amplitude et en phase en fonction de la fréquence. Si la différence de 1.5 dB en amplitude persiste un des câble a un problème !
Enfin une différence de niveau de 1 dB entre les courbes ne signifie pas qu’un des câble est meilleur que l’autre. Si cet exemple sert à montrer que l’oreille humaine peut déceler un différence de niveau de 1.5 dB, cela n’est pas un scoop.
Quand on veut comparer des câbles il faut commencer régler les niveaux identiquement à l’entrée de vos sub à chaque mesure. On sait que l’oreille et le cerveau interprètent souvent le signal le plus fort comme étant le “meilleur”, toutes choses égales par ailleurs.
Ne dépensez pas votre argent pour 1.5 dB d’écart !
Le grand “pipeau” du son des câbles a encore un bel avenir…
Well, I thought I’d try it for myself and got an SR purple fuse to try out for 30 days. I could send it back if I couldn’t hear any difference. Of course I was hoping I couldn’t tell the difference, which would save me €199, but alas…. My RS250A sounds so much more open, with instruments and voices all in a more defined place, more control in the bass department. It’s like getting a a much better dac.
And before all you non-believers start fuming at the mouth: We did blind tests. My son changing fuses, with me and an audio buddy out of the room. We both could tell which fuse was in the Rose every time. And when my son did the blind tests, he passed every single time as well. I don’t know the science behind all this and I doubt if you can measure differences in soundstage at all, but the fuse makes a difference. Don’t say it impossible or my imagination until you’ve tried it for yourself.
Wow, that’s some really strong power of self-delusion!
You just couldn’t help yourself, could you?
Interesting. Did you try reversing the fuse direction. Proponents say that also makes a difference.
I’m not in that camp but would consider removing the fuse completely and use a copper IEC inlet.
No, I didn’t. I put it in as instructed: the side of the fuse with the S where the fuse clamp is in contact with the live pin of the power cable.
Science is science and I know a lot of it ! No need to try miraculous fuses or reversing the fuse, it is completely nonsense… You can see that about the directionnality of fuses !!! The power is alternative current, so the current is half time in one direction and half time in the other ! But I am sure you can ear difference between the two directions. If you really want !
Dunning kruger effect at its best 
“Ignorance in physical laws” effect…
We can go on like this until we’re blue in the face, or maybe you can actually try for yourself, instead of believing something is absolutely impossible because of, well, science. I used to be in that camp, but now that I have heard differences through several tweaks, I’m not so resolute anymore. Not because I wanted to hear differences, on the contrary, I wish I hadn’t heard some of them. It would have been cheaper and sometimes also less disappointing. And if you’re not open to try and experience something you deem impossible, that’s cool too. I don’t give a fuse As long as we can all enjoy our hobby and system the way we like.
Nothing personal, of course, but with your “blind test” setup you’ve described Clever Hans to a tee.
It’s always nice to be compared to a horse, especially one with my name. You might have had a point, had you been there to see the test with your own eyes, instead of (again) assuming to know how things went down. But you weren’t there. Unless you are “Invisible Boris”.
Let’s just agree to disagree. 
I said, nothing personal 
We could believe that a directional 
fuse plugged in AC line before a power supply that rectifies and regulates its output has effect that’s clearly audible. That’s not just Nobel prize material. That would be the greatest discovery in physics since Archimedes’ bathtub fell out of an apple tree and hit Newton on the head. Seriously. And to think that a device that demonstrates a slew of heretofore unknown phenomena while disproving a number of laws of physics is available everywhere for pretty low price!
We could believe that. Or, we could just read your experiment description, see the number of rather glaring shortcomings in the setup, and conclude that nope, our understanding of the world had not been turned upside down. Just another test of subconscious biases.
No worries Boris, I didn’t take anything personal. It’s just a fun discussion that will never end if we’re not careful.
I get all the science and I don’t get why a fuse or whatever unlikely tweak might make a difference, when science says ‘NO’. I told you, I was in your camp - I still am for the main part - but I do believe that some tweaks can make a difference, whether it’s illusion, self-delusion, or something science one day will have an answer to (stranger things have been discovered). I don’t know. I also don’t really care, because when it makes me enjoy my system even more, it’s worth it to me and to many other audiophiles alike, who enjoy their fancy cables, fuses, LAN isolators, fog lifters, ground boxes, vibratrons, hft’s (I know), acoustic dots, sound pebbles (grin), frozen cd’s (really?), etc, etc. I drew the line at fancy cables and a fuse (which blew me away). And I once tried an isolator, which didn’'t do anything at all. I try to keep an open mind and try some stuff every now and then, just for fun. Nothing wrong with that, I hope.
Well, I think there we have it. This The Science 
does agree with – if you’ve subconsciously hoped for there to be some difference, there will be a vast perceived difference. Science has no problem there, just like it also says that the time it take to turn Rose off, replace the fuse, and boot it back on, is longer than human auditory memory, so by the time the switch is done, you don’t really remember what the previous incarnation sounded like. This is all the stuff that has been studied, measured, and documented.
In the end, if it makes you happy, it’s fine, and 200 Euros isn’t so terrible, but it is also a purely subjective result. Objectively there is no difference.
My main objection here isn’t really people spending their money whichever way they see fit, it’s supporting people peddling directional cables (and, yes, fuses) …
I know auditory memory is short, but when you learn how to actively listen to music and make notes while you listen, you can actually hear and pinpoint differences in small things like the distortion of a tine in a Fender Rhodes, the reverb tail of a cymbal, a damper lightly touching a piano wire, the hight of an instrument, it’s place in the stereo image, the blackness of the background, how much a voice is pushed to the back when a guitar is played at the same time (or not), well you get the idea. Small details that can have an impact on how one perceives the music coming from the speakers. That’s how I listen to different amplifiers, speakers, dacs, streamers, cables, etc. If I would just listen more or less casually, the differences would have be rather obvious (like with different speakers) for me to spot.
Most of the time I just enjoy the music though and if you were to change my interlinks or powercable without me knowing, I’m sure it would take me a while before I’d notice
Well, yes, just like you’ve described. If you try really hard, you can hear any kind of differences, regardless of whether they are there or not.
Psychology of perception is a science, too, just like electronics
Well, that’s not what I said, but that does not seem to matter, so let’s just leave it.
Thanks for your insights, next time I won’t buy a new amplifier. I’ll just image one.
It might even work for you. Although unlike fuses, amplifiers actually do something.
PS yes, this is a pointless discussion since “I know memory is short BUT MY golden ears will hear differences in a test that is neither random nor blind” isn’t something that can be argued factually.
Not any kind of personal attack, but there are ways of doing those tests properly, and there are well known, measured and documented capabilities of hearing. You can ignore them s long as it makes you happy with your system, it is perfectly fine, just not transferable to anyone else’s listening experience.
Hi Hans,
Which size fuse do I need for the RS250A? The 5x20 mm or the 6.3 x 32 mm?
Looking forward to try it and see if I notice an improvement in sound quality.
(Je mag me trouwens gewoon in het Nederlands antwoorden ).
Groet,
Hendry