LosIsATool 5,000+ posts
CarAudio.com Veteran
Think about the comps that go buy the amount of subs. It would fit right in. They are very impractical like you said but so is a 18 for most people.True, those 4" coils can handle a good amount of power. Even if you could realistically put 3500w on a Warden, I could still buy two AA Mayhem 18's for the same price and have close to double the power handling and have 30% more cone area.
21" woofers just seem impractical for the most part.