Hex-core vs. Round-core bass strings – which is right for you?

This is not an article about string brand, although some will be mentioned. You most likely use a very specific brand because you like the sound and feel that the string provides. Instead we’re just going to talk about hex-core and round-core, and why it matters when making your string choice.

Hex-core

Hex-core is literally a hexagonal core shape, usually resulting in a stiffer overall tension when the string is tuned to pitch. Why? Mainly because the six edges of the core “bite” into the surrounding wrap.

If you like a string with a lot of “pop”, “twang” or sound “piano-like”, hex-core is a good choice. And on many bass guitars, a hex-core string makes for easier intonation.

The disadvantage of a string using hex-core is that it’s more difficult to bend due to the higher tension of the string, and the high-tension nature can cause pain both for plucking and fret hand.

As a reference, all D’Addario bass strings as far as we’re aware have a hex-core.

Round-core

As you probably guessed, round-core uses a literal round core. This core type has less tension when tuned to pitch, and fingers can bend it easier.

A round core string has a vibration when plucked that does not necessarily last as long as hex-core, but for some is more controllable in sound to the ear. For example, a brand new set of hex-core strings will have a “bowwwww” sound to them no matter how lightly you pluck, whereas round-core can give some more control over the string’s sound just from plucking strength rather than having adjust a tone knob to get the desired sound you want.

As a reference, DR’s Hi-Beam, Sunbeam, Flat Wound Legend, and Rare models use a round core.

Thicker vs. thinner core

This is where things can get confusing, but we’ll try to explain this as best we can.

Some strings have thin cores and thick wraps, while others have thick cores and thin wraps.

Thicker cores would be something such as Dunlop “Heavy Core” bass strings.

Thin cores are usually (but not always) reserved for more classical instruments, such as upright bass.

Thicker core strings, which is probably the one you’re more interesting in knowing about, are designed for use with very specific tunings. Namely, drop D and D standard, drop C and C standard and drop B and B standard.

Fortunately, which to go with for which tuning is fairly easy to figure out. A 45-105 set would be for D, 55-155 would be for C and a 55-120 would be for B. You don’t have to use those exact gauge measurements, but that’s pretty close if not exactly what you should use for each heavy-core tuning.

What happens if you use a really thick heavy-core set in standard E? That usually results in a string snapping fairly quickly, particularly on the thickest strings. Either that, or you may encounter some odd-sounding overtones.

What happens if you use a lighter heavy-core set dropped down to B? A lot of string “flop” and buzz happens, and not necessarily the kind you would like.

What are the advantages of thicker core strings?

First, you should be able to play them the same way as you would a standard core size string in dropped tuning, meaning you shouldn’t have to change your whole playing style just to play lower.

Second, you should be able to achieve the same predictable tone with a thicker core as you would with normal core when dropped. What this means in basic terms is that a pluck of a thicker core drop C should react and sound the same way as it would on a normal core low E.

Third, the wear-in of heavy core strings in dropped tuning should be as predictable as they would be with normal-sized core.

What would be a good choice for “Classic Fender Tone?”

For finger pluckers, roundwound round-core is a good choice. If seeking out something really easy on the fingers, flatwound round-core works great. Or, if seeking out something easy on the fingers with more tension in the string, flatwound hex-core works well.

For slap players, roundwound hex-core is usually what gets “that sound” more than any other – unless you like an easier-bending string, in which roundwound round-core may better suit you. For example, if you really like the current thickness of string you’re using now, but say to yourself, “I really wish this could bend just a little easier,” try a round-core set. You may have to adjust your playing style slightly, but if you’re looking for easier bends without changing string thickness, try round-core.

What’s good for the metalhead?

Metal bass players that drop low need a string that can be struck that holds its tuning without wavering out-of-tune constantly. They also need something that really cuts through a mix.

Roundwound hex-core definitely does the job here, and for the super-low tuners out there, consider the heavier core string sets if you’re encountering issues with your thickest strings wavering out of tune when striking hard.

(Note: We do carry Dunlop strings, but not the Heavy Core series. However, we can get them for you. Contact us and ask.)