[SteveCallas]

The larger the enclosure, the lower a tune one can get away with and the lower the Q will be, meaning a more damped system, or more accurate bass. By using a really low tune, transient response issues are largely kept in the lowest of frequencies. Then consider that such a low tune allows one to get away without using a high pass filter, which negatively affects transient response. Finally, consider that almost every LLT has mated extremely well with typical room gain, resulting in very flat in room FRs to very low frequencies, pushing the transient response issues into even lower frequencies again, and I think you will find time domain issues to be very well behaved, definitely much more so than more traditional ported subs.

Even in just comparing the Monolith to the Plus/2, you'll see the Monolith has better transient response due to no highpass, more volume per driver, and a naturally lower tune.

An IB should have the greatest transient response of all, as it is the most highly damped. A small sealed box typically has a higher Q, and is actually "sloppier". It needs a LT to flatten out the response and optimize performance.