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P1 Dual Monaural Phono-Stage
Dual Monaural Phono-Stage P1
“CH Precision’s P1 Phono
preamplifier... is not going back
to its manufacturer. The longer
I used it, the more obvious it
became that I couldn’t part
with it, even though I said I
couldn’t afford it.”
MICHAEL FREMER, STEREOPHILE
Thirty years ago few people predicted that, not only would
we still be listening to records in the 21st Century, we
would still be pressing them too. For many listeners, the
vinyl record is more than just a viable source – it’s the
pre-eminent source of recorded music.
That reflects both the inherent qualities and character
of analog sound, but also the fact that record replay has
significantly upped its game in the face of ever-increasing
competition from high-res digital sources. These days,
serious record collectors and listeners wanting the best
possible sound will seek out rare original pressings,
appreciate the virtues of mono (as opposed to many stereo)
releases and purchase their discs, new and used, from all
over the world.
Likewise, the once simple process of playing those discs
can achieve levels of sophistication and record-by-record
optimization we never dreamed of, back when the vinyl LP
was the only high-quality format.
Today’s record players and tonearms offer an
unprecedented range of facilities and adjustability – all
designed to extract the maximum possible performance
from your cartridge and the record it’s playing. But if the
magic in that fragile phono signal is to be preserved rather
than eroded by the rest of your system, you will need a
phono-stage that is just as versatile and adaptable, that
can be fine tuned to the same exacting degree. Meet the
CH Precision P1, a phono-stage that takes those demands
seriously, offering an unmatched combination of musical
performance and adjustability – versatility that ensures you
hear every last expressive and emotional nuance teased
from the vinyl groove.
With multiple, independently configurable inputs and with
all-important parameters individually adjustable from the
CH-Control App, the P1 can handle up to three, permanently
connected turntables or tonearms. With a combination
of both current and voltage-sensing inputs (along with a
simple yet sophisticated set up protocol for the latter) the
P1 maximises the musical performance of any moving-coil,
moving-iron or moving-magnet cartridge, while the optional,
switchable EQ facility means that collectors of early, original
pressings can finally hear those discs in all their glory. Being
part of the CH Precision, upgradeable/scalable Eco-system
means that the P1’s already remarkable performance can
be further enhanced with the external X1 power supply,
or even taken all the way to the full dual-chassis, four-box
configuration.
Whether you want to play a Sgt Pepper’s mono pressing
or a Decca SXL2000, the P1 will play it for you – and play it
right. It’s never been so easy to collect great records. The P1
exists to let you hear what makes those records great.
we still be listening to records in the 21st Century, we
would still be pressing them too. For many listeners, the
vinyl record is more than just a viable source – it’s the
pre-eminent source of recorded music.
That reflects both the inherent qualities and character
of analog sound, but also the fact that record replay has
significantly upped its game in the face of ever-increasing
competition from high-res digital sources. These days,
serious record collectors and listeners wanting the best
possible sound will seek out rare original pressings,
appreciate the virtues of mono (as opposed to many stereo)
releases and purchase their discs, new and used, from all
over the world.
Likewise, the once simple process of playing those discs
can achieve levels of sophistication and record-by-record
optimization we never dreamed of, back when the vinyl LP
was the only high-quality format.
Today’s record players and tonearms offer an
unprecedented range of facilities and adjustability – all
designed to extract the maximum possible performance
from your cartridge and the record it’s playing. But if the
magic in that fragile phono signal is to be preserved rather
than eroded by the rest of your system, you will need a
phono-stage that is just as versatile and adaptable, that
can be fine tuned to the same exacting degree. Meet the
CH Precision P1, a phono-stage that takes those demands
seriously, offering an unmatched combination of musical
performance and adjustability – versatility that ensures you
hear every last expressive and emotional nuance teased
from the vinyl groove.
With multiple, independently configurable inputs and with
all-important parameters individually adjustable from the
CH-Control App, the P1 can handle up to three, permanently
connected turntables or tonearms. With a combination
of both current and voltage-sensing inputs (along with a
simple yet sophisticated set up protocol for the latter) the
P1 maximises the musical performance of any moving-coil,
moving-iron or moving-magnet cartridge, while the optional,
switchable EQ facility means that collectors of early, original
pressings can finally hear those discs in all their glory. Being
part of the CH Precision, upgradeable/scalable Eco-system
means that the P1’s already remarkable performance can
be further enhanced with the external X1 power supply,
or even taken all the way to the full dual-chassis, four-box
configuration.
Whether you want to play a Sgt Pepper’s mono pressing
or a Decca SXL2000, the P1 will play it for you – and play it
right. It’s never been so easy to collect great records. The P1
exists to let you hear what makes those records great.
Technical Specifications
MC current-sensing input impedance
< 100mΩ, virtual ground
Equivalent Input Noise (EIN)
< -135dBu without X1, <-138dBu with X1 / 1Ω termination, gain +70dB, 22kHz BW
MM/MC voltage input impedance
Variable from 100kΩ to 20Ω
Equivalent Input Noise (EIN)
< -130dBu without X1, <-135dBu with X1 / 1Ω termination, gain +70dB, 22kHz BW
Playback EQ curves accuracy
+/- 0.1dB
High pass filter
3rd order (-18dB per octave), 10Hz
Max analog output level
8V RMS balanced
4V RMS single-ended
Frequency response
> 400kHz (RIAA equalization filter disconnected)
Total Harmonic Distortion + Noise
< 0.01%, 1kHz, output level 3V RMS, 22kHz BW
Dimensions/Weight
440 x 440 x 133mm (W x D x H) / 20kg
Moving Coil Current Inputs • Two inputs specifically designed to deliver the best possible performance
from low-output, low-resistance MC cartridges
• Gain adjustable in six discrete steps (with actual gain dependent on cartridge
internal resistance)
• Current-sensing delivers the best signal-to-noise ratio possible from low
output MC cartridges and eliminates the need to set individual load impedance
• Both single-ended (RCA) and balanced (XLR) inputs provided
Moving Magnet / Moving Coil
Voltage Input
• Input designed for MM cartridges, MC cartridges or step-up transformers
• Ultra low noise FET input stage
• Gain adjustable from 35dB to 70dB in 5dB steps
• Cartridge loading adjustable from 20 Ohms to 100k Ohms in over 500 steps
• Dedicated set up record and internal loading ‘wizard’ shows optimum gain
and loading performance on main screen
• Both single-ended (RCA) and balanced (XLR) inputs provided
Optional EQ Curves • Built-in RIAA and eRIAA EQ curves
• Optional add-on board provides EMI, Columbia, Decca and Teldec EQ curves
for owners/collectors of older records or original pressings
Analog Signal Path • All adjustable parameters and EQ curves selectable on unit or via CH-Control App
• Dual-mono circuitry with fully complementary output stage
• Ultra low noise, high bandwidth, high slew rate design
• Class A, discrete transistor-based circuit topology
• Selectable 10 Hz 3rd order high-pass subsonic filter
Power Supply • Ultra low noise, high accuracy, discretely regulated, linear power supplies
• Shunt regulation throughout
Scalable And Upgradable • Available in Dual Monaural (single chassis) or True Monaural (dual chassis with
one channel per enclosure) form
• Can be powered by the X1 external PSU (Dual Monaural), a dual output X1
(True Monaural) or a pair of single X1s for the ultimate four-box solution.
• Additional audio chassis or PSU units can be added at any time
Optional Hardware • EQ Board
• Four additional playback EQ curves
• EMI, Columbia, Decca and Teldec EQ curves, realized using of custom built,
high grade film capacitors and tight tolerance metal film resistorsors