I don't know if fast equals detailed, but I definitely think that fast reveals detail.
For example, take a speaker cone that is not well damped, whether it is due to the cone design itself, or whether it is due to lack of control of the cone by the amp. The inertia of the cone results in the cone being slow to stop or change its movement with signal changes. The undamped movement of the cone will then mask or muddy other musical detail. If the cone is "fast" in its start and stop movement, the detail would be revealed. So fast in this case isn't detail; rather, fast reveals detail.
I have a related story. One time I was playing with a pair of small monitors and a sub. I set the crossover for the sub at too high a frequency, with too much overlap with the monitors' mid/woofer cone. In addition to too much bass, the perception I had was that the monitors were "slower". "Slow" was the word that immediately came to my mind, without any regard or conscious thought to proper audiophile terminology. When I reduced the crossover frequency, the monitors then became "faster" as I perceived it. My rationalization was that the bass from the sub was masking detail produced by the monitor. The words "fast" and "slow" were the words that best described my perception of the sound.
For example, take a speaker cone that is not well damped, whether it is due to the cone design itself, or whether it is due to lack of control of the cone by the amp. The inertia of the cone results in the cone being slow to stop or change its movement with signal changes. The undamped movement of the cone will then mask or muddy other musical detail. If the cone is "fast" in its start and stop movement, the detail would be revealed. So fast in this case isn't detail; rather, fast reveals detail.
I have a related story. One time I was playing with a pair of small monitors and a sub. I set the crossover for the sub at too high a frequency, with too much overlap with the monitors' mid/woofer cone. In addition to too much bass, the perception I had was that the monitors were "slower". "Slow" was the word that immediately came to my mind, without any regard or conscious thought to proper audiophile terminology. When I reduced the crossover frequency, the monitors then became "faster" as I perceived it. My rationalization was that the bass from the sub was masking detail produced by the monitor. The words "fast" and "slow" were the words that best described my perception of the sound.