(1) External power supply input. For X1 optional external power supply only
(2) Mains switch and power cord receptacle (on back panel)
(3) Adjustment shafts and screws
(4) Mains filter board
(5) Power supply section
(6) Main power transformer
(7) Standby power transformer (ensures green mode standby)
(8) Front panel power supply board
(9) Display (on front panel)
(10) Balanced and single-ended outputs
(11) XLR/RCA connectors for the MM/MC voltage input. Only the XLR or the RCA can be connected to a cartridge at a time
(12) XLR/RCA connectors for the two MC current inputs. For each input (MC1 and MC2), only the XLR or the RCA can be connected to a cartridge at a
time
(13) Control board (USB plug for firmware update and Ethernet RJ-45 plug for control from Android App)
(14) Single-channel phonostage board (one or two per unit)
(15) Backplane board
(16) Power supply regulation board
(17) User interface push-buttons
1.1 Input stage
Three inputs are available on the P1. Two of them are in current mode, dedicated to MC cartridges. The third input is in voltage
mode, accommodating both MM and MC cartridges as well as step-up transformers.
MC1 and MC2 Current mode input: a current mode input reads the current generated by the cartridge (not its voltage).
Current mode inputs are usually dedicated to MC cartridges. The current from the cartridge is amplified by a discrete
transistor based trans-impedance amplifier. Using current mode inputs provide a superior signal to noise ratio compared
to a conventional voltage input, better immunity and by essence no necessity to match impedance. The gain of the trans-
impedance amplifier is intrinsically dependent on the cartridge internal resistance. The lower the cartridge internal
resistance, the higher the gain. Multiple gain settings are available on each input to accommodate the variation of
resistance among cartridges.
MM/MC Voltage mode input: a voltage mode input reads the voltage generated by the cartridge. The voltage mode input
is used for all types of cartridges as well as with step-up transformers. The cartridge output signal is amplified by a
voltage amplifier. The input is fitted with a user-variable resistive load (variable between 20 Ohms and 100 kOhms),
allowing to adjust the cartridge loading impedance and providing a frequency response as flat as the setup will allow. In
order to assist the user to set up his system, the P1 comes with a feature that measures the frequency response of the
system (cartridge, cables and P1 input) and displays a series of graphs showing the flatness of the system.
1.2 RIAA playback equalization
RIAA playback equalization is a specification for the playback of phonograph records. The P1 is fitted with a passive
implementation of the RIAA equalization, using high grade, high tolerance metal film resistors and custom made film capacitors.
The RIAA equalization provides an accurate filtering for the playback of all the discs recorded with the RIAA equalization. However,
older records (up to the mid 50's and sometimes later) were recorded using different equalization. The P1 can be fitted with an
optional board that contains 4 extra equalization filters: Columbia, EMI, Decca and Teldec. Please refer to your local dealer for
6 P1 User Manual Rev 1.1
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