Scientific Anglers Amplitude Smooth MPX Fly Line
Half-Size Heavy 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 as 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
- An excellent general-presentation line for trout, panfish
| Specification | Value |
|---|---|
| Weight | Half-size heavy |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
| Best For | Trout, panfish |
FAQ
What makes the Amplitude Smooth MPX different from other fly lines?
The Amplitude Smooth MPX features a redesigned head with more mass toward the front, improving presentation and shooting performance. It also includes the AST Plus slickness additive, which enhances shooting ability and durability.
Is this line suitable for trout and panfish?
Yes, the Amplitude Smooth MPX is specifically designed as an excellent general-presentation line for trout and panfish.
How does the drag compare to traditional fly lines?
This line offers up to five times less drag than traditional fly lines, improving casting efficiency and sensitivity.


Katherine Davies –
I’ve used this line for several weeks on trout streams and it casts smoothly with minimal drag. The presentation is sharp and the line holds up well in wet conditions. Great for both finesse and power.
Brandon Ince –
The AST Plus additive makes a noticeable difference in how the line shoots. I can cast longer distances with better control, especially in windy conditions. Highly recommend for panfish and small trout.
Evan Russell –
It’s a solid choice for general fishing. The durability is impressive and the line feels balanced. A bit heavier than I expected, but that helps with presentation.
Paul Young –
After switching from a standard line, I noticed a significant improvement in casting accuracy and line performance. The smoothness and resistance to tangles are excellent.