Quantum Science Audio Thread

I am thinking of getting a red QSA fuse to replace a yellow one on my Lumin X1. There is a large cost difference. But, I may be willing if it adds to sound quality.

Can anyone provide their experience on the differences?

ozzy

I replaced the SR Orange fuse and installed the QSA Yellow fuse in the phono stage for the last listening session. This is the same QSA Yellow fuse that I was using in the line stage. Still some trade-offs. I’m beginning to think that the QSA yellow fuses take a long time to fully break in.

Another QSA yellow fuse has been shipped. It will go into the amp, replacing the SR Orange fuse currently in use there. At this point, I’m thinking there’s more detail and perceived clarity from the yellow fuse, but more midrange magic from the SR Orange fuses. Overall, from a musical standpoint, I’m preferring the SR Orange fuse. I’m going to keep a/b/a/b testing. Stay tuned.

As a side note, I’ve a/b/a tested for two of my audiophile friends. One is of the opinion that the QSA fuse really messes up the midrange. The other friend is like me ... he hears the advantages of both fuses.

Frank

I like the QSA Blue more than the SR Orange. Less forced sounding, smoother, better mids and more at ease. This is in my tube hybrid integrated amp. I will stick with the Blue. Love it! Three of them in my Int amp.


May be gear synergy dependent. 

Same here with the Blue. Sounds so good, got me keen to try the even better ones. 

cerberus79
A few months ago I purchased a used pair of speakers from another Agon member.
To my surprise all the fuses were Orange fuses. I listened to them and then to satisfy my curiosity I replaced them with ordinary buss fuses and could not hear a difference.
I did this test with a bunch of friends and neither I or them could hear a difference. Kind of just says it all doesn't it?

To those non technical thinking of purchasing these $$$ fuses. Just save your $150+ and do this instead.

A fuse:
1: two end caps
2: short piece of fuse wire connecting the two end caps through a glass tube (that’s all she wrote).

To those "non technical" members that are interested in "maybe" wasting their money, do not listen to the non-technical, listen to the technicians of this industry that design the audio products you have and listen to. AND YOU WON"T SEE THEM ON THREADS LIKE THIS AGREEING WITH WHAT SAID HERE ABOUT THE SOUND IMPROVMENT DETAILS AND AC FUSE PLACEMENT DIRECTION, EVER!!!
Just clean and tighten your fuse holder and re-new your fuse (if old) with a good quality 50cent Bussman, Littlefuse or similar.As with "many switch-on surges" they do deteriorate, bend, stretch and get crusty with electrolysis formations on their fusible wire elements before they give out, as these pics show of a fuse wire element ageing over time show. https://ibb.co/9NbTwqK (even the $$$ boutique ones will age just as much also)

Cheers George