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Quantum Science Audio light blue fuse; $71, what a bargain!

I wanted to start a new thread about the more affordable versions of these fuses. I don’t doubt that the higher end versions are amazing, but most of us aren’t very likely to be able to hear them for ourselves. Fortunately, pretty much anyone who is serious about building a musically enjoyable and engaging system can get a good taste of what they’re all about.


I’ve had the light blue QSA fuses ($71) in my CD transport and DAC for over two weeks, now. They replaced SR blue fuses, at around twice the price, and easily bettered them. I am expecting one more light blue tomorrow, to replace an SR orange in my amp. I’ll give an update on that, once I get it installed and listen.


Meanwhile, here are a couple quotes from my posts on the other thread:


“What I am hearing is; voices & instruments are more solid and lifelike, with increased natural detail and sense of space, better dynamics, and a more relaxed overall sound.”


“Just got in a second light blue fuse for my DAC. So far, more of the same improvements I got in my CD transport. Very nice!😃 One thing I appreciate is the break in seems to be pretty quick, without any of the nasties you get with some other stuff. Pop it in, and you’ll hear improvements in short order, at least that’s been my experience.”


I am continuing to greatly enjoy what these fuses bring to my system, and am really looking forward to getting the last one in my amp.


tommylion
pauly
1,012 posts
 
@glory 

I swing the soldering iron myself, so for the price of three yellows there is a smorgasbord of other improvements I can do, not to mention NOS tubes and a better PC for my pre.

The yellow fails when I consider the marginal rate of utility substitution. Blue is on the knife edge. 

I'll go with a single blue for my pre. I'll listen to that and then evaluate the improvement vs. other improvements I can get for the $$. Low hanging fruit first.
t_ramey
651 posts
 
Violet and another yellow is on order. I'll be able to compare a light blue to a yellow to a violet in my dac. My preamp also uses the same amperage fuse so some experimenting is in my future.
tommylion OP
874 posts
 
t_ramey,

That will be be a very interesting and helpful comparison. Look forward to your report.
glory's avatar
glory
1,616 posts
 
Pauly,

Blue will be a great start. Yellow is like an upgraded AC cable, tubes, new amp and new speakers.

These fuses are hard to understand, by those who have not heard them, the major SQ improvement that they bring to ones system.

Some 175 hours on the Red Black. Starts off really open and transparent then it hit a dead spot and now 😱🎶🎼🎵🚀.

Tone and textures are 💯. With the Add Powr X2 there’s a sound that’s addictive.
If you have an Add Powr X2/4 get at least a yellow it it. 

wig's avatar
wig
1,306 posts
 
Yes, start with a blue fuse and you’ll be amazed; one fuse change is more noticeable than going from copper to silver interconnects but without any thinness...😁

Wig
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