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Martin MA540 SP Phosphor Bronze Authentic Acoustic Guitar Strings Light 12-54

Item# MAR_MA540
$7.49List Price $9.99
In Stock & Ready to Ship!

Item Description

Martin MA540 SP Phosphor Bronze Authentic Acoustic Guitar Strings Light 12-54

MA540 - Gauges:12-16-25-32-42-54

These strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. We start with our highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you don't see matters! When coupled with our highest quality wrap wire you get consistent true tone that you can count on song after song. Available in 80/20 Bronze and 92/8 Phosphor Bronze. Martin Authentic Acoustic SP® strings offer excellent tuning stability, corrosion resistance and great playability.

Martin MA540 SP Phosphor Bronze Authentic Acoustic Guitar Strings Light 12-54
Martin MA530 SP Phosphor Bronze Authentic Acoustic Guitar Strings Extra Light 10-47
Martin MA535 SP Phosphor Bronze Authentic Acoustic Guitar Strings Custom Light 11-52
Martin MA545 SP Phosphor Bronze Authentic Acoustic Guitar Strings Light/Medium 12.5-55
Martin MA550 SP Phosphor Bronze Authentic Acoustic Guitar Strings Medium 13-56
Martin MA500 SP Phosphor Bronze Authentic Acoustic Guitar Strings 12 String Extra Light 10-47
Martin 3 Pack MA540PK3 SP Phosphor Bronze Authentic Acoustic Guitar Strings Light 12-54
Martin 3 Pack MA550PK3 SP Phosphor Bronze Authentic Acoustic Guitar Strings Medium 13-56


9 Reviews
78% (7)
11% (1)
11% (1)
0% (0)
0% (0)
89% Recommend this product (8 of 9 responses)
By John
Nice tone
March 7, 2021
Great tone. Martin strings are always a pleasure.
By John
Sussex, NJ
Pleasantly Surprised
April 1, 2020
I recently tried a set of the new Martin SP PBs on my J45. Not really expecting much of a difference from the old ones but I was pleasantly surprised - the lows seemed to be a little warmer and the highs tamed down a bit. Overall, these matched my guitar and made my Gibson sound like . . . well . . . a Gibson. Recommended.
  • Longevity
  • Tone
  • None
By Nathan
Hamlyn Heights, Victoria
Best strings on the market
November 11, 2019
I've been using Martin strings fro almost 20 years on my acoustic guitars and they've never let me down. Durable and tone for days. Why waste your time with anything else?
By Valeriy
Moscow, Russia
Excellent tone from the start but mellowed down very fast
September 18, 2019
I put this set on my Gibson J-45 Standard just to check out how this guitar will sound with PB strings - used only 80/20 before on this guitar. The strings sounded very good with a lot of overtones and to my taste too much overtone for this guitar, but then, after just 6 days it started to sound dull.
Then, after 1 or 2 days of sounding dull, it went slightly brighter for several days, then again produced the mellower tone. Not bad for J-45, but overall I was surprised by the quick degradation. I have dry palms and uncoated strings usually last a while.
  • Very rich tone initially, for 6 days
  • "Mellow down" too quickly
Fantastic strings
July 2, 2019
Incredible sound
By Ginoux P.
Cavaillon , France
puissance et nettet� .
January 15, 2019
Ces cordes sont plus puissantes que les msp 4100 et plus raides , on le sent au montage .
Le son est moins "brillant" , la guitare tout en �tant plus puissante a un timbre moins " exhub�rant " , plus lin�aire , les basses plus pr�cises et les aigus font penser aux monels .
By Mark
Wow, Wow, Wow
December 1, 2018
I never get involved with commentary of products, but I feel obligated to say WOW, with Martins new Authentic Acoustic line of strings.
Installed the PB variety on my 000-28ec, my Gibson sj200, and my Collings CJmh, in each case there was an immediate improvement in all areas of tone.
Pardon the cliche', but in every way the guitars came to life.
Great sustain, solid bass, and smooth bell like treble.
I have tried many strings over the years, and yes there are differences, but never tothe degree I hear with these. A vast improvement in all areas, IMOP.
Can't say how long they'll last, haven't had them on that long.
Ther worth a try to any guitar out there. And I will always buy from Strings and Beyond.
They have always been courteous, professional, ship quickly, and competitively priced.
  • None
By Layton
Sound and Feel Real Good
October 26, 2018
I am a big fan of uncoated strings with Martin at the top of my list. When these new Authentic uncoated SP's came out i bought a bunch of the old uncoated strings (love them) and one pack of Authentic.
After 3 days playing i wish i just bought just the new Authentic strings. (Based on one set and one Collings guitar).
The sound is rich and balanced.....different yet still Martin strings.
I get 3 months out of previous uncoated strings at which time they start to discolour but still sound ok; up to about 4 months then for sure need a change. (I also clean once a week and use a XLR8 or similar string lube/cleaner/conditioner).
I am very interested to see how these new uncoated Authentic strings hold up.
The only con i can see with the new Authentic's is the sure has gone up but it is probably more in line with the competitors and the costs of today. Corporations typically are very aware of where their prices are.
  • What a clean, bold, articulate string. I didn't think they could song better but they do.
  • Price....too bad they went up.
By Gunbarrel
Boulder, CO
Great update
October 7, 2018
Great job Martin! I€™ve tried both 80/20 and PB in 12-54 & PB in 13-56 and can happily say that these strings really are better than the previous versions. The package is gorgeous though I find it hard to see if they are PB or 80/20 which is my sole complaint.

The strings look and feel fresh and once in tune they stay that way! Playability is easier, especially in medium, but they still sound amazing with a pick which, to me, the flexible core series does not. Sustain is incredible and with about 16 hours on this set they still sound new! Big sounds with clarity.
  • Fresh looking and feeling out of the box. Stay in tune excellent and string life has been better. Feels just a bit easier to play and there is a smooth feel with less string noise. They seem to have actually made everything better!
  • Only it can be harder to tell 80/20 and PB apart, but most people use one or the other so just blind guys like me can?t see it.

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