Scientific Anglers – Amplitude MPX Fly Line

$129.95

5.00 out of 5

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The first series of lines to feature the revolutionary AST PLUS slickness additive, the Amplitude series will shoot farther and last longer than any other line on the market.

Free shipping on all United States orders over $50.

SKU: N/A Category: Scientific Anglers Fly Lines Brand: Scientific Anglers

The first series of lines to feature the revolutionary AST PLUS slickness additive, the Amplitude series from Scientific Anglers will shoot farther and last longer than any other line on the market. It’s slickness down to a science.

Built a half-size heavy, the 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
* Floating Texture on the tip section for the ultimate in flotation
* Shooting Texture running line delivers longer casts
* The ultimate general presentation line
* Improved version of our GPX taper
* Made a half-size heavy to load fast-action rods
* Best for large dry flies, nymphs, and streamers
* For use in moderate and cold climates
* Braided multifilament core
* SA ID – SA AMPLITUDE MPX WF X F (X = line weight)

AST Plus is A new formulation of Scientific Anglers patented dry-slick technology provides continual line slickness over the lifetime of the line. Up to 40% slicker than other lines, fly lines with AST Plus cast farther, float higher, and stay cleaner than any other lines ever built.

Scientific Anglers Amplitude MPX Fly Line- color is Optic Green/Turtle Grass/Buckskin, sold here in 3wt-8wt.

SA Amplitude Textured MPX 3wt WF-F
* 30′ Head Weight: 110 grains
* Total Head Weight: 120 grains
* Head Length: 32 feet
* Total Length: 90 feet

SA Amplitude Textured MPX 4wt WF-F
* 30′ Head Weight: 130 grains
* Total Head Weight: 140 grains
* Head Length: 34 feet
* Total Length: 90 feet

SA Amplitude Textured MPX 5wt WF-F
* 30′ Head Weight: 150 grains
* Total Head Weight: 175 grains
* Head Length: 36 feet
* Total Length: 90 feet

SA Amplitude Textured MPX 6wt WF-F
* 30′ Head Weight: 175 grains
* Total Head Weight: 210 grains
* Head Length: 38 feet
* Total Length: 90 feet

SA Amplitude Textured MPX 7wt WF-F
* 30′ Head Weight: 200 grains
* Total Head Weight: 260 grains
* Head Length: 40 feet
* Total Length: 90 feet

SA Amplitude Textured MPX 8wt WF-F
* 30′ Head Weight: 225 grains
* Total Head Weight: 305 grains
* Head Length: 42 feet
* Total Length: 90 feet

1 review for Scientific Anglers – Amplitude MPX Fly Line

5 out of 5

Douglas (verified owner) – October 13, 2026

I usually use Infinity lines. I wanted to get a slightly different feel on an Echo 6 weight, TFO Blue Ribbon 3 weight, and Redington Trailblazer 5 weight. This line was the perfect solution for me! It changes the fast action rod to feel slightly more like a medium fast, with a little more bend and more sensation on the loading action on the rods. Definitely a great line!

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Fly line grain-weight specifications

This is the official AFTMA (American Fishing Tackle Manufacturers Association) chart of fly line grain-weight specifications, based on the front 30 feet of a fly line.

Our website lists the grain weights for each line in its description. Compare that weight with the chart to see whether a particular line is true to size or overweighted.

Weight in grains for the front 30 feet of fly line

Line Weight	Low	Target	High
	Weight in Grains
1	54	60	66
2	74	80	86
3	94	100	106
4	114	120	126
5	134	140	146
6	152	160	168
7	177	185	193
8	202	210	218
9	230	240	250
10	270	280	290
11	318	330	342
12	368	380	392
13	435	450	465
14	485	500	515
15	535	550	565

Have more questions? Contact us or watch this video we made explaining the concept:

Free shipping on orders over $50 within the continental US (UPS Ground or USPS). Orders under $50 ship for $7.95.
Faster options: 2-Day and Overnight are available at checkout for an additional charge.
Processing: Orders ship the same day or the next day. You’ll receive a tracking number via email once your package leaves the shop.
Oversized items: Some large or heavy items carry a shipping charge. If so, it’s listed on the product page and added automatically at checkout.
Back-orders: No backorders. If we don't have it, you can't buy it!
International: Canada $29.95 (under 4 lbs) or $49.95 (over 4 lbs). All other countries $49.95 (under 4 lbs) or $69.95 (over 4 lbs).
Sales tax: Applies only to orders shipped within Ohio.

Read our full Shipping Policy

If you need to return an item for any reason:

Simply follow the instructions that are provided with each order.
Send us a quick e-mail, [email protected] and / or drop a note in the return package with the following information: Your name, Order Number, Item(s) and a quick note on reason for returning.

These instructions will also be printed on the return/address form. Please note that if it has been longer than 30 days, we will need to contact you to get a credit card number in order to apply for the credit. Please make sure that we get a good phone number in that case.
Drop the item in the Mail / UPS to us and that’s it – We’ll be looking for it!

We will be waiting for the item and will issue an immediate credit to your credit card account or you may leave the money on the store account for future purchases. If we don’t hear otherwise, the refund will go back on the exact card used for the transaction. *Note: If an item was not purchased via the internet, phone or the purchase was made more than 30 days previous, we will need to contact you to secure a means of credit.

Once we process your return, we will make a note on your “Customer Service Notes” and then drop your return/credit receipt in the mail.
Non-defective, returned merchandise must be in re-sellable condition.
Please make non-defective returns within 30 days of purchase – please contact us if more time has passed.