In my book, there is no such thing as the best speaker for a certain type of music. A Good hi-fi speaker should sound as accurate as possible to hear what was recorded as it was meant to be heard. If a speaker sounds good for metal and sounds sh*t for jazz, that means this speaker is far from being an hi-fi speaker. I listen to jazz, metal, classic and electropop in equal amount with the same IEM (Etymotics ER-4S), with same loudspeaker with the same settings (pure direct mode with no EQ, no sound coloring effects) and they dont sound too different with respect to the music type I am listening. The only bad sounding records with those equipments are those which were produced sh*tty since such hifi equipments never forgive bad productions. My advice to you is that 'don't give a f*ck to any review or advice and choose the most accurate and most flat sounding speaker you can find and afford'. You can refer to their frequency response charts to find the most flat.
