Scientific Anglers Amplitude Smooth Trout GP 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, the Amplitude Smooth Trout GP will change the way you look at fly line performance.
This quarter-size heavy line features a mid-length head for exceptional mending and accuracy at distance, making it the caster’s line of choice. Whether you’re fishing dry flies, nymphs, streamers, or indicators, the Amplitude Smooth Trout GP delivers unmatched performance across all general purpose trout applications.
| Specification | Value |
|---|---|
| Line Type | Smooth Fly Line |
| Weight | Quarter Size (Heavy) |
| Head Length | Mid-Length |
| Application | Dry Flies, Nymphs, Streamers, Indicators |
| Drag Reduction | Up to five times less drag |
| Durability | Eight times more durable than traditional lines |
FAQ
What makes the Amplitude Smooth Trout GP different from other fly lines?
It offers up to five times less drag and eight times the durability of traditional fly lines, with a mid-length head that improves mending and accuracy at distance.
Is this line suitable for all trout fishing techniques?
Yes, it performs well with dry flies, nymphs, streamers, and indicators, making it ideal for general purpose trout fishing.
What is the recommended weight for this fly line?
It is a quarter-size heavy line, designed for heavier casts and consistent performance in various fishing conditions.


Wanda Stewart –
This line has significantly reduced drag during long casts. I noticed much smoother transitions when mending, especially on windy days. It holds up well after multiple uses in water with debris.
Julia Hughes –
The mid-length head gives me better control when casting over distance. I use it for both dry fly and nymphing, and the durability has exceeded my expectations.
Max Coleman –
Great performance in general trout fishing. A bit heavier than I expected, but the accuracy and consistency are worth it for long casts.
Michelle James –
After several seasons of use, the line still looks and performs like new. No breakage even during heavy use in fast-moving streams.
Benjamin Wilson –
I switched from a traditional line and noticed a clear improvement in casting distance and line feel. It’s especially good for streamer fishing with quick mends.