I've heard this many times. At my work, my manager tells me that an 18" driver can never move as quickly as a 12" driver. And that for simulated effects, like explosions, very big drivers can't move quick enough. I hate it that I couldn't explain this misconception, this myth. I just disagreed but I know that it's wrong. I recently got my "Louderspeaker design cookbook", and I am learning a lot (only on page 22, ). But I would like to learn how and why bigger drivers are not slower than smaller drivers. His response to me was that the 18" driver simply moves too much air. He also said to me that it's a physical impossibility that an 18" can move as quickly as a 12" driver. I would like to clear this issue up once and for all. All those who are technically inclined, please offer your advise and explain away this misconception. Please. Thank you.