Two terms I don't understand - please explain

Phaser's explanation of slam is better than mine. It refers specifically to bass transients.

Great explainations of the generally accepted interpretations of these terms; however, I'd like to point out that the Pace, Rhythm and Timing part of PRaT are misnomers. All but the most seriously flawed systems get these elements of sound reproduction correct.

All but the most grossly out of whack turntable will get pacing (tempo) right. If pacing is right, then rhythm and timing (another word for rhythm) are right.

So what leads to this impresion of better PRaT for one system vs. another, it's the ability to effortlessly reproduce dynamic range, from the very softest to the very loudest, without introducing other undesireable elements (distortion).

I'm a serious musician and we often use dynamics and accents to imply speed and motion. If you don't hear the dynamic change, then the music sounds, lifeless and uninvolving.

PRaT and Slam are the same, IMHO, except that Slam refers to bass dynamic performance.

PRaT seems to be a permanent part of our lexicon, but I think misunderstanding it might do more harm than good. I'd like to see it banished, but I'm only one vote.

In those instances where Pace is flawed, it's usually the fault of the TT or the TT's power supply variability, causing wow and flutter or speed inaccuracy. Guess what, when you fix these things you get better "slam". Applying this to other components, where electrons flow in nanoseconds is folly, IMHO.

DAve

Pace, Rhythm and Timing are nice, but I'll take Noilly Prat any day--it mixes well with gin at about 1 to 8 and makes everything sound better. ;)

Dcstep. I disagree that every TT that's not "grossly" out of whack gets pace right. I don't think belt drives in general do. My Lenco does, though. Also, poor speakers or badly matched speakers and amp can be sluggish.

I too disagree with Dcstep about PRaT. IMO it is more about subtle micro dynamic shading- even within a single note/chord as it is played. Slam is only the leading edge of the note, when you feel the kick drum hit your chest concisely for instance...