Interesting. You and I listen to a lot of similar music. I don't go quite as heavy as Napalm Death. I need a speaker that does well with metal but for me it is Black Sabbath, Iron Maiden, Judas Priest, Avenged Sevenfold, Disturbed, etc... For punk, Sex Pistols, Early Police, Ramones, Iggy Pop, etc... Though I also like a lot of 60s psychedelic, 80s and my wife listens to 90s hip hop, oh and Classical gets mixed in regularly. Finding a speaker that does all that well is hard and when you roll in the added requirement of <40hz performance, it gets harder still.
I know what you mean about the speaker market not being geared toward you. Part of why I started my company.
We had a great moment at AXPONA where we had a group of guys who were in the room and did 5 or 6 songs at their request. Music started with Michael Jackson and we capped it with The Trooper. One of the guys commented "I can't believe I am about to sit down and critically listen to Iron Maiden." Every time we played Metal the room filled. Way more guys feel the speaker industry isn't geared towards them than you would think. That being said, I was running a subwoofer.
What market are you in?