No, because "speed" doesn't exist. It's a mythical hi-fi beast that has no relation to real music and how real instruments create sound. The inaccuracy that many relate to as speed is simply an emphasis of upper mid/lower treble that accentuates the leading edge of notes over their natural envelope and decay. Often accentuated by over damped and unextended bass performance. In essence a lot of modern speakers have gone too far in compensating for the tendency of old speakers to have too much upper/mid bass, usually in the form of resonance. Of course removing resonance will make a speaker more transparent and open, allowing better insight in to what the musicians are playing. But often modern speakers just suck out all of the upper/mid bass response to try and compensate for their resonant cabinets. Modern cabinets haven't improved in the last 10-15 years they're just as resonant because they use exactly the same construction and materials as they did back then.