QSA 5x20mm Slow Blow Fuse

"Many high-end audio tweaks I've heard sound great, but none have matched QSA's remarkable performance. I repeat, none." — Clement Perry, StereoTimes

"Same." — Mike Garner, Tweek Geek

We don't usually quote ourselves in product descriptions. In this case it seemed warranted.

What the QSA Fuse Does

QSA applies their proprietary quantum treatment to otherwise standard fuse housings. The fuse installs exactly like the original — same dimensions, same ratings, same procedure. What changes is immediately audible in any system that's reasonably well set up. More inner detail. Better PRAT. Greater naturalness. A more dimensional soundstage. These are not subtle shifts.

The mechanism behind the treatment isn't something QSA explains in conventional engineering terms, and we're not going to fabricate an explanation for them. What we can tell you is that we've installed QSA fuses in our own reference system, in customer systems, and in components we've evaluated — and the improvement is consistent, significant, and not dependent on expectation bias.

The Levels

QSA offers multiple treatment levels, each with a distinct character. Yellow is the entry point and already a meaningful upgrade. Red adds greater naturalness and dimensionality. Black/Red focuses more on detail and image density. Gold and Crystal Gold Red represent the upper tiers where the improvements become increasingly dramatic and increasingly difficult to give up once heard. We've heard all of them. The general advice: start at Red or Black/Red to understand what QSA does, then decide whether to go further.

Important Notes

All QSA Fuses are special order and non-returnable. They are upgradeable via our trade-in program — credit toward a higher level if you want to step up. Match the amperage and slow blow specification of your component's original fuse exactly.

Press Recognition

QSA fuses have been reviewed by StereoTimes (Clement Perry's review is quoted above), The Audiophile Man, and discussed extensively on AudiophileStyle and What's Best Forum. The consistent finding is that the improvement is real, significant, and the most cost-effective upgrade available for most systems.

Specifications

• Size: 5x20mm
• Type: Slow blow
• Available levels: Yellow, Red, Black/Red, Gold, Crystal Gold Red
• Amperage: Multiple ratings available — match to your component's specification
• Note: Special order, non-returnable, upgradeable via trade-in

Not sure which amperage or level to start with? Reach out — we'll walk you through it.