POINT STEREO STEREO FIELD EXPANSION (CPS/SFX*)
Center Point Stereo (CPS) does the impossible; delivering
a 300 degree sound field from a single cabinet with rich, vibrant
and natural sound, and a stereo “sweet spot” seemingly
musicians produce stereo recordings with stereo instruments
and stereo effects. I
am sure you can’t remember your last mono recording.
Stereo is a must have for audio recordings, but no musician
could even dream of “producing” stereo in their
live performances until now. CPS has made that dream come true.
Daniels and Aspen Pittman discovered the secret behind making
stereo work for live performance, and were awarded US and International
patents for their unique CPS technology. The Fender Musical
Instrument Corp. (FMIC) immediately licensed for their award
winning Acoustisonic SFX amp, and has produced no less than
4 CPS (SFX) products under this license since 2000.
Guitar World first hailed the Fender SFX Acoustisonic
amp, saying: “Suddenly, you’re swimming in the
sound of your guitar.”
It was the first of many such endorsements.
You can see our user endorsement pages for more but for now
let’s talk about how and why CPS works.
Like most great solutions that make “broken” things
work, it’s pretty simple. But to fully understand this
groundbreaking technology, we need to understand why the old
way does not work.
The Old Way
Conventional stereo involves two loudspeakers, spaced apart,
for reproducing the right and left channels. The physical
separation between the speakers determines the “sweet
spot,” which is usually a small area somewhere in the
center of the intersection of the separated sound from the
speakers. This may be work well enough in your living room,
but in live performances, it means that less than 5% of the
audience, and 0% of the performers can actually hear the
The result, in live performance, is that bands
simply perform in mono under the theory that it's better to
hear all of sound in mono than half of the sound in stereo.
The CPS Way
CPS changed everything; like bringing color to black & white,
and working magic for performer and audience alike. It performs
3D stereo miracles for keyboards, guitars, drums and vocals.
There is nothing else that comes close, because nothing else
works like it.
CPS electronically encodes the left and right
input signals into front and side output signals.
These front & side signals can be amplified
by any common stereo amp (tube or SS) to drive the special
CPS front & side single-speaker cabinet. This cabinet design
positions the 2 front & side speakers at 90 degrees from
each other (right angles).
front speaker gets the SUM (or common) content of the left
and right signals (whatever appears in both signals). The
side speaker gets the DIFFERENCE (or uncommon) content of
both the left and right signals (whatever is different from
these signals). The technical term for this circuit is a "Sum
and Difference network," as popularized in the MS (Mid/Side)
stereo recording process. It is accomplished by combining
the L&R in out-of-phase fashion, so these are electronically
out-of-phase signals when finished. Keep that in mind for
So now these electronically out-of-phase signals
will be amplified and reproduced from speakers at 90 degrees
from each other. In other words, speakers that are technically “out
of phase,” so when played at similar volumes in a live
soundfield the two acoustical signals CANNOT MIX.
Thus, they arrive at your ears unaffected from each
other “unmixed.” Your brain
then mixes these signals and presto -- you hear stereo!
speaking, the CPS solution creates a “spatial vortex”,
which works to keep the signals separate, and the stereo
effect intact. The 3D stereo soundfield will never collapse
to mono, no matter where you are in the room. CPS stereo
even goes all over the stage for the musicians, while the
EXACT stereo mix goes around corners and through doorways
into other rooms to reach their audience without losing its
stereo soundfield. This making playing live a pure pleasure
again, because the players hear exactly what their bandmates
hear, and it’s also exactly what the audience is hearing.
It sounds too good to be true, but CPS delivers this magical
effect every time to open-jawed performers and audiences
Once you've heard Center Point Stereo you'll
never use mono or "the old way"again!
Hogarth, an influential East Coast performer wrote:
“I finally got to use this SFX Spacestaton
MK2 on a solo gig two weeks ago ... vocals and acoustic guitar.
Simply put, I was bloooown away!! This unit is one of the
most incredible innovations in performance technology. The
sound filled the entire room and as a result the audience
was so intensely engaged and silent at one point, that I
had to open my eyes and look up to see if they were still
The stereo imaging throughout the room is
simply magical...I find myself plugging in, playing and walking
around trying to decipher this feeling of sound floating
around my head in stereo no matter where I walk in the room.
Congratulations on yet another excellent product. I swear
you cats at GT are making products that are way ahead of
Currently CPS is only available by purchasing
the Fender SFX Acostisonic amps, as the GT
Spacestation MK2 is out of production until we find a new licensee to distribute
the box. But... we are working hard with several other
amp manufactures to release new CPS licensed products. Please
see our CPS/SFX product archives to get an idea of the many
uses for this technology.
CPS GROOVE TUBE PRODUCTS FENDER