What exactly is PRaT???


Ok, it’s like this thing and is associated with “toe tapping” and such.  I confess, I don’t get it.  Apparently companies like Linn and Naim get it, and I don’t and find it a bit frustrating.  What am I missing?  I’m a drummer and am as sensitive as anyone to timing and beats, so why don’t I perceive this PRaT thing that many of you obviously do and prize as it occurs in stereo systems?  When I read many Brit reviews a lot of attention goes to “rhythm” and “timing” and it’s useless to me and I just don’t get it.  If someone can give me a concrete example of what the hell I’m not getting I’d sincerely be most appreciative.  To be clear, enough people I greatly respect consider it a thing so objectively speaking it’s either something I can’t hear or maybe just don’t care about — or both.  Can someone finally define this “thing” for me cause I seriously wanna learn something I clearly don’t know or understand.  

soix

Showing 8 responses by cdc

@tunehead Provides the only realistic answer. Dirk and Lerxst approved.

I do not see his post.

 
 

Some songs have it and some do not. Some stereos can reproduce it and some can not.

I just happened to put together a system recently that beats you over the head with prat. Wish you could hear it. It blows my mind what this system can do and I feel a little smug y’all missing out. It is a completely different way to experience music. Not detail, not soundstaging, not tonality, not bass. It’s a pulsation going through the whole song /band top to bottom.

Technically YG talks about phase coherence through the x-over. It is not the same thing as a 1st order x-over. I found a 4" driver with long throw Xmax timing was off vs a normal Xmax 4" driver.

 

By optimizing the amplitude, phase and phase slope, the drive units are phase coherent over a huge range—for an octave or more around the crossover point. Across this wide range frequency, each driver is moving in exact synchronization with its neighboring drive unit. To your ear it seems like there is just a single source of sound.

It is difficult to overstate what a revolution this is. To our knowledge, no-one else has been able to achieve this level of coherence. The degree of scientific and engineering knowledge, the precision of measurement and the cost of running the simulations required place it outside the typical capabilities of manufacturers in our industry.

 

These have it on my system:

CHAI - sayonara complex - LIVE at STUDIO COAST (The CD studio version does not)

Paul McCartney, Khruangbin - Pretty Boys (Visualizer)

Gaslighting Abbie

Pace is the speed, rhythm is the repetitive beat, timing is the emphasis. Music, stand-up comedy, the stage, film, writing--success in these crafts is largely defined by these three simple but discrete elements.

@dogearedaudio +1. Alec Guinness, Anthony Hopkins IMHO made you want to listen to them and convincing because of the way they used Prat to express their lines.

 

How do you listen to pace and rhythm? Forget about it.

@jayctoy You don’t listen to it like detail imaging etc. You feel it.

 

Didn't someone say music is comprised of 2 things, rhythm and melody?

 

@nonoise Yes that helps. Even though can’t hear them I will research. They must have a really good x-over. BTW, I have that same tuner circa 2001. Bought before Marantz did their major downgrade.

Typical loudspeaker step response:

TAD Micro Evolution One loudspeaker

The tweeter’s output leads that of the midrange, which in turn leads that of the woofer. How the heck do you think you will hear PRAT when all three driver’s are out of sync? And this speaker ain’t cheap . . . . .

This could be why Sonus Faber speakers have PRAT and others do not:

Sonus faber Lumina II Amator Bookshelf Speakers: Crossover: Optimized amplitude/phase response for optimal space/time performance.

Optimized amplitude/phase response for optimal space/time performance Hybrid IFF-Paracross solution.

The IFF circuitry and the phase coherent philosophy ensure perfect rendering of the virtual sound stage in three dimensions. The new filters also offer greater resolution and more rigorous and coherent reproduction.