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Roundwound growl, Flatwound thump...how can I get both?

As the title says, I'd like to find a string that marries the qualities of both a roundwound and flatwound string. I have tried half-rounds, and while the thump was pretty good, I found they lost that brightness/growl pretty quickly.

One option I've been looking at are GHS Pressurewound strings, or should I try a heavier-gauge roundwound? Any help/advice here would be much appreciated. Thanks!
 
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To try and get both out of a single string set is always a compromise, and GHS Pressurewounds (alloy 52 wrap) or the new Ernie Ball Cobalt flats are your best bets.

String manufacturers have been trying to obtain both for years with half/ground wounds. Some folks love them, but to me they are dismal failures. You may like them.
 
String manufacturers have been trying to obtain both for years with half/ground wounds. Some folks love them, but to me they are dismal failures. You may like them.

It took me a while, but I appreciate groundwounds for what they are. But yeah, you have to have THE bass for them, otherwise it just doesn't sound good.
 
I'm having great luck with Warwick EMP's on my Thumb they have a nice flat thump with enough bite to keep that Warwick sound. In the past I have tried different brands of half-rounds and quarter-rounds without any luck I'll check out those pressure rounds for another bass.
 
If you want a round that sounds "flat-ish," Pressurewounds.

If you want a flat that sounds "round-ish," EB Cobalt Flats.

Of course, this is oversimplified, because there are issues of string tension, roughness/smoothness of wraps, etc.
 
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I've had excellent results with Sadowsky flats on an ebony fretless board. Not as thumpy as old-school La Bellas, but not bad, and also a surprising amount of presence in the upper mids, and sweet highs. They will growl when I dig in with each hand.

Tension is mid-range - not baseball bats like LaBellas or Chromes, nor floppy like TI Jazz Flats. I will try some on a fretted bass at some point, and am curious how slap-worthy they might be in that context.

Also should try some cobalt flats at some point, but no immediate need to do so.
 
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I also want to try the EB Slinky Flats but haven't gotten around to it.

I've gotten a similar tone to what you're looking for with Elixer roundwounds. I keep them on for about a year. After they break in they still get a bright tone when you play hard, and I can get a flat-like thump by backing off and finger muting.