I am always happy when a creator of a particular stombox or the PR Manager from the company chimes into the discusion, welcome onboard!

Now let's see...
First, this needs to be said - don't get hung up on stages. The number of stages in a phaser is absolutely meaningless
I'am shocked!!

Does this mean a 12+ stage phaser won't sound any different than a well-constructed 4-stage one?

I really don't need a 8 stages minimum phaser to get a good Jet Phaser tone??
I am sceptical about this and have to disagree, the # of stages determines the # of notches introduced in the signal, thus different amount will sound different. It would be a lot easier if it was otherwise...
what people are really asking is "how far does it sweep?"
I am usualy asking that about flangers. What I am asking first about a phaser is... "how much stages?"

Although the sweep width for phasers is also an important and valid concern!
Not all phasers are created equally, and not all phaser stages are capable of the same degree of offset. In fact, they don't all sweep the same number of degrees at the same frequencies - the degree of offset decreases at higher frequencies.
Phantasm has 4 optically driven stages, and sweeps over 500 degrees at 1KHz - that's closer to the amount of shift you get from 6-stage phasers... and that's why the # of stages is meaningless.
Hmm... I am not an engeneer nor am I skilled in electronics in any ways, but I don't see any reasons, why a properly build all-pass filter (with quality parts) could work differently than another one. The phase shift of one all-pass filter (one phaser stage) is a function of frequency and it raises towards 180 degrees when frequency goes towards infinity. It's obvious that at 20khz the phase-shift has to be lower, like 170 deg or whatever. Then at 1khz it will be even lower.
The exact value's depend on the center frequency. The Phantasm is very unique - it's center freq is sweepable. If you set it well below 1khz, like 500hz for example, the sum of phase shift at 1khz can total 500deg or so. But if you set it at one 1khz, then you will be always near 360deg, no matter how well it is constructed! So comparing a 4stage to 6stage that way to show the number of phase stages is meaningless, isnt a valid point for me. Sorry!
Alright, I sounded a bit harsh, but this is by no means an offence here. I might be talking garbage here, if I do, please clarify! I just would like to be clear what to expect form the Phantasm, since it's one of the 4 phasers I am seriously considering. I am also very interested in guitar electronics, how it works etc. , hence my geekiness showing in this thread and some others. Hope you'll understand!
Oh, and the ACD function is pure genius! Two thumbs up to the guy who decided to include it! I'll be trying to do that on a Moog Phaser sometime!
