Thumbs down to the Sharps. Common term for serious knives and Bayonets and stuff.
But then if they are a survivalist band…
Harmonic Frequency
Con-chord-ance
Infrangible Sound (Or just “infrangible” but I doubt many people will get it.)
Other possibilities:
The 8 Testicles
The Past Your Bedtimes
The Household Toiletries
4 Men in a Tub
The Platonic Fornicators
The Garfield Hates Mondays
The Colon Cleansers
Colonel Cleanser and the 3 Stomachs
Colonel Cleanser and the 6 Testicles
The most apropos name ever:
Pay Us to Stop
It’s a barbershop quartet, so barbershop music and no instruments.
It’s not the “Sharps,” it’s “The Be Sharps,” with literal meanings like “be aware” or “be stylish” and a play on words with respect to the musical note “B#.” Nothing whatsoever to do with edged weapons.
I have my head stuck in 1927 a lot of the tine, so I’ll give you some nice old timey names…
Dixie Harmonaires
Rhythm Rebels
Southern Songsters
Southern Harmonizers - or Southernizers
Bamaliers (Alabama + Cavaliers)
The Raisinettes
The Brothers Zonohedron
The Dresden Guards
Two Bits. (As in “Shave and a haircut.”)
So you’re techies who all practice a particular aural discipline? I hope you like good solid obscure wordplay…
Since you’re Sonic Techs, how about calling yourselves Tonic Sechs?
That either results in a grin or a groan, I know. 
Core Tech
Harmonious Funk
The Olde-Tyme Happy Fun Musick People
The Albanian Skullfuckers
In case you don’t know, it’s a Simpsons reference.
(Grandmaster Figaro and) The Furious Four
Skokie Illinois
: applause :