Scientific Anglers Amplitude Smooth MPX Fly Line
The Amplitude Smooth series of lines are, simply put, the highest-performance smooth fly lines in the world. With up to five times less drag and eight times the durability of traditional lines, this will change the way you look at fly line performance. Built a half-size heavy, the Amplitude Smooth MPX taper starts where the GPX left off. Redesigned with more mass toward the front of the head, the MPX provides the same benefits of the GPX, with an added emphasis on presentation. The power is still there, only with an added bit of finesse. Meet your new best friend.
- Features the revolutionary AST Plus slickness additive for superior shooting ability and increased durability
- Excellent general-presentation line for trout, panfish, bass, grayling and carp; also useful for steelhead
| Specification | Value |
|---|---|
| Line Type | Smooth Fly Line |
| Taper | Half-Size Heavy |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Key Additive | AST Plus Slickness Additive |
FAQ
What makes the Amplitude Smooth MPX different from other smooth fly lines?
The Amplitude Smooth MPX features a redesigned head with more mass toward the front, improving presentation and finesse. It also includes the AST Plus slickness additive, which enhances shooting ability and durability.
Is this line suitable for fishing in still waters?
Yes, it is particularly effective for trout, panfish, bass, grayling, and carp, making it well-suited for still or slow-moving waters where smooth presentation is key.
Does the line perform well in windy conditions?
The reduced drag and improved slickness help maintain control and accuracy in variable conditions, making it reliable in light to moderate wind.



Jessica McGrath –
This line has made a big difference in my trout fishing. The smoothness and low drag allow for better casting and more natural presentations. I’ve noticed fewer tangles and the line holds up well after multiple uses in cold water.
Jessica Parsons –
The AST Plus additive really helps with shooting the line through the air. It feels more responsive and stays clean even after repeated use. Great for both still and moving water.
Neil Kerr –
I use it for panfish and bass. The presentation is smoother than my previous line, and I get better hook-ups. A bit heavier than I expected, but that’s fine for the finesse it offers.
Leonard Anderson –
After switching from a traditional line, I can cast farther with less effort. The durability is impressive—no fraying even after a few weeks of regular use.