Would smashing both sets of speakers hamper the gituar's efficency? If she has speakers, it has to be an electric, because acustics don't have ports to plug in. And Electric gituars sound rather crap without speakers.
The guitars used by Discord and Rocksmith are magic guitars. They don't need speakers to sound awesome, the speakers are only there to make their music more powerful.
The guitar and drumkit will still work without the speakers being there, since they're magical in nature, but removing the speakers will ensure they can't be used by the Hell's Bitches against you in some way. If you don't take out the speakers something bad
might happen to the team, on the other hand it might not have any effect at all on the battle. Don't want to give away too many of my tricks too early, do I?
As I said there's hidden plot hooks in place around the location which can be used in both positive and negative ways against the team. It might be worth reading back over the previous scenes to try and spot where I may (or may not) have laid traps.
Since Rocksmith used 4 energy, Thrash will be a walrus for 2 turns, not 1.
I was certain that said 2 Energy the first time I looked. :)