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Thomastik-Infeld Acoustic Guitar Spectrum Bronze Round Wound Medium, .013 - .057, SB113

Thomastik-Infeld Acoustic Guitar Spectrum Bronze Round Wound Medium, .013 - .057, SB113
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9 Reviews
89% (8)
0% (0)
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0% (0)
11% (1)
0% Recommend this product (0 of 9 responses)
By Petros
Very Disappointed With These Strings
April 5, 2021
I have been using Thomastik strings for years, but only their swing flatwounds for electric guitar. The Spectrum strings are supposed to reduce finger squeak. They don't. They are hardly polished. Spectrum strings are supposed to be warmer than other bronze strings. They're not. These strings are not any better in tone or feel than D'addario Flat Tops Phosphor Bronze strings, but they cost $10 + more. I can't believe it myself, but these strings just do not deliver the kind of quality I expect at that price.
Too much finger squeak. No different tone than other phosphor bronze strings
By Fdwil
Spectrum Bronze mediums
September 22, 2014
I completely agree with the 'best ever for a couple of weeks' review. When new, they sound magnificent on my Collings D2HG. They even got a remark from my wife in the other room. They really did sound different than any other string I've used over 60 years. Alas, that sound was gone after two weeks. They are still mellow but without the resonance I first heard. I'll try another set to see if they all fade fast, but if they do, it's back to Pyramids for me.
By Al
They Bring out the Woody!
May 24, 2012
These strings will bring out the woodiness in your instrument - or if your instrument is not woody - these strings will make it woody - it's like they're made of wood : ) Seriously - these are not like normal phosphor bronze strings - the silk inlay process and overall construction will bring out the gypsy jazz/django tonality in your guitar. If you dig that idea you will DIG these strings. If you like bright jangly, nondescript tone - these are not for you.
By Rockbl
Best ever -- for a week or two
October 15, 2010
Put a set of Spectrums on my 3 year-old Gibson Southern Jumbo.... and was bowled over by the fabulous, warm vibrant tones that exploded out of the guitar. The new strings turned a very pleasant sounding instrument into a guitar to die for. For the next week, I was blown away by how wonderful the guitar sounded every time I picked it up.

Well.. that only lasted for a week or two. Now those strings sound just OK at best. I'm going to leave them on for a while, see how they do. I've had strings actually get better after a month or more on the guitar. Of course, I know they won't sound like brand new again.

These strings are very expensive, but they are the best I've ever heard ... for a week or two. If I was a professional, I wouldn't be using anything else.
By tommy b.
thomastik = fantastik
September 18, 2010
By tommy b.
thomastik-infeld SB113
July 27, 2010
simply THE BEST!
By Russell T.
Spectrum medium
January 24, 2010
Excellent strings for my Collings dreadnought. They have the best highs out of all the strings i have used. The mediums are very light,lighter than most. A stiffer medium string would really help drive a dreadnought. These strings sound better than any string out there.
By Lewis S.
T-I Spectrum Bronze Medium
December 14, 2009
Excellent strings, a bit stiff if you're used to light/mediums.
Rich full sound on my Crafters of Tennessee Studio Magogany.
They last for a long time. I used the light gauge on my Taylor 422.
By Vicki G.
Thomastik Infeld Spectrum Bronze Acoustic Strings
August 14, 2009
My Cort acoustic/electric guitar is "pick-y" about the strings I use. It rewards me with the best and most satisfying sound when I take the extra effort to find and use Thomastik Infeld strings.....specifically the Spectrum Bronze series in the Medium weight (13-56).

I've been using TI strings for years (when I can find them) and I've always been pleased with the quality and tone. Thanks, Just Strings, for making them easily available online when the most touted music stores nationwide fail to carry them on their shelves. Their loss!






1st E

Plain Steel



2nd B

Plain Steel



3rd G

Bronze Round Wound



4th D

Bronze Round Wound



5th A

Bronze Round Wound



6th E

Bronze Round Wound




Spectrum Bronze Acoustic Series

characteristics: clear, balanced tone, ideal for recording sessions

"At last, the ultimate acoustic guitar string for recording, SPECTRUM BRONZE Series. You'll hear and feel the difference in the toughest situations from studio to stage. The treble strings are plain silver steel, the wound strings have a highly polished bronze covering. Deep basses, superb midrange and ultra clear highs, give extra power for those "intense" moments. SPECTRUM BRONZE Series deliver all this, … and more!!

The ultimate bronze round wound acoustic string! The Spectrum Bronze Series is specially designed for the demands of professional recording, yet is also unsurpassed in live performance situations. A unique bronze formula, combined with Thomastik-Infeld's mastery of mechanical filtering with their silk inlay technology, gives a full warm tone, with a sparkling clarity that lets you cut through a dense-sound mix. Playing feel is very balanced, and they are surprisingly long lasting.



Founded in 1919, one of the world's largest manufacturers of strings for musical instruments has applied 76 years of experience to develop a new generation of strings.


Vienna, music capital of the world


Our strings are handmade by highly qualified specialists. With our extensive quality control via computer and signal processing equipment, we have successfully combined Old World craftsmanship with state of the art technology.


The results of our research and our scientific approach to string manufacturing -- based on cooperation with musicians and scientists -- have led to the creation of a new line of guitar strings that is exactly what professionals are calling for.


Guitar strings for creative musicians.

THOMASTIC-INFELD is the best kept secret in the music industry. Did you know that for decades most of the great jazz and classical guitar players have chosen THOMASTIK-INFELD strings? Old World quality and experience, combined with the most advanced modern technology available, give you creative tools to meet the highest standards of performance. Perhaps the time has come for you to discover what a chosen few have know for years? THOMASTIK-INFELD cares about the needs of professionals and amateurs. Worldwide."


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