There is no such thing as fast bass. In other words a low long wave low frequency will never have a sharp upstroke. To get that implies the addition of high frequency content.\n\nThe bottom line is that the system must have an excellent transient response to have natural realistic reproduction.I completely agree with TLS Guy, transient response explains how time matters to bass behavior.\n\nWe have had this conversation before. I searched and found a previous thread where I took the effort to discuss how a speaker cabinet's Q is directly related to bass transient response. Cabinets with high Q result in bass that rings on and on, while low Q can result in bass that is well damped.\n\nhttp:\/\/forums.audioholics.com\/forums\/threads\/frequency-response-graphs.92881\/#post-1062303\n\nQtc and transient response explain this better than "frequency response curves flat to 20 Hz…". Read it and tell me whether it helps you understand this better. At first, I found it hard to understand until I realized the transient response time gets longer as Qtc gets larger. The shape of the bass roll-off curve is directly linked to short (low Q) or long (high Q) transient responses.\n\nTransient response isn't directly linked to bass deviations due to room reflections, but if bass comes from a sub woofer with a high Q cabinet design, its long ringing transient response will provide more time for the listener to be aware of unwanted standing waves. It will have more time to muddy over and obscure other sounds in the music that would be more easily heard with bass from a low Q cabinet.