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CH P1 User Manual

Dual monaural phono stage
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Dear Valued Customer,
We are honored that you chose the P1 Dual Monaural Phono Stage for your audio system. Our team devoted their best efforts to
design and manufacture this top quality versatile and future-proof product and is proud to present it to you. We hope your P1
phono stage will bring you uncountable hours of emotion from your music collection.
But before you embark on your musical journey, we kindly request your attention to the information contained in this manual. The
P1, as you will discover in the following pages, is a Swiss precision product designed for ultimate performance and flexibility.
However, reaching sonic excellence requires your unit to be set up and operated correctly and this what this manual is all about. If
you have any questions or require assistance, please don't hesitate to contact your authorized dealer.
We hope you will enjoy your P1 phono stage for many years.
The Concert has just begun...
Rev 1.1
Cossy F.
Heeb T.
P1 User Manual
1

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  • Page 1 Dear Valued Customer, We are honored that you chose the P1 Dual Monaural Phono Stage for your audio system. Our team devoted their best efforts to design and manufacture this top quality versatile and future-proof product and is proud to present it to you. We hope your P1 phono stage will bring you uncountable hours of emotion from your music collection.
  • Page 2 P1 User Manual Rev 1.1...

  • Page 3: Table Of Contents

    Table of contents 1 Phono stage highlights................................ 5 1.1 Input stage................................6 1.2 RIAA playback equalization............................6 1.3 Voltage input impedance loading: helpful guidance from your P1.................. 7 1.4 Careful metal work construction..........................7 1.5 Power supply................................8 2 System Setups..................................9 2.1 Dual Monaural setup..............................
  • Page 4 8.3 Optimal gain selection.............................. 31 8.4 Refined loading selection............................31 9 Firmware update................................32 9.1 Preparing the USB Stick............................32 9.2 Updating the unit's firmware............................ 32 9.3 Emergency firmware update procedure........................32 10 Troubleshooting................................33 11 Specifications.................................. 34 P1 User Manual Rev 1.1...

  • Page 5: Phono Stage Highlights

    X1 External power supply units. The P1 is a pure Class A discrete transistor based circuitry. This results is ultra low noise, high bandwidth and high slew rate performances. The signal stays in the analog domain all the way through.

  • Page 6: Input Stage

    (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.

  • Page 7: Voltage Input Impedance Loading: Helpful Guidance From Your P1

    The wizard allows to analyze the frequency response of the entire system (cartridge + tonearm + P1 input loading), while varying the resistive loading of the P1's voltage input. Users can select to test the entire [20 Ohm – 100 kOhm] range that the P1 provides, or any subset of that range for finer tuning.

  • Page 8: Power Supply

    Discrete ultra low noise regulators are used throughout the power supply to ensure the purest low noise DC feed possible to the different audio sections. Each phono stage board enjoys dedicated analog regulators. The second, smaller toroidal transformer inside the P1 is used as the Standby transformer to ensure green Standby mode, meeting the latest energy saving regulations.

  • Page 9: System Setups

    DC regulation circuits are used for each board. For ultimate performances, the X1 External Power Supply unit should be added to the setup. XLR or RCA cables Turntable P1 Phonostage XLR or RCA cables Balanced XLR cables L1 Preamplifier Dual Monaural setup Rev 1.1 P1 User Manual...

  • Page 10: True Monaural Setup

    In this setup, two P1s enclosures are used to hold a single channel each (Left respectively Right). The entire power supply of each P1 is dedicated to one channel, further enhancing the system performances. Both P1s should be connected to a network via a router to ensure all audio settings (such as gain, selected input, cartridge laoding) are synchronized between units.

  • Page 11: Read Carefully Before Use

    Please store the packaging for future use. Check your P1 phono stage for any apparent damage. In case of a damage, please contact your authorized dealer. If your P1 phono stage is still very cold due to transport, please let it warm up to room temperature in order to avoid condensation inside the unit.

  • Page 12: Mains Supply

    3.6 Maintenance and Servicing The P1 phono stage contains no user serviceable parts. Do not try to open, modify or repair your P1 by yourself. This will void any warranty. Your P1 phono stage must be checked by a qualified technician in any of the following cases: ...

  • Page 13: Installation

    Installation 4.1 Unpacking Unpack your P1 phono stage and store the packaging for future use. The P1 phono stage is fairly heavy, so have someone to help you when removing it from its packaging. 4.2 Removing the transportation screw The transformers must be secured during transportation to avoid internal damage. The transportation screw is located at the bottom of the unit.

  • Page 14: Top Covers

    The aluminum top covers are used for decorative purposes only, either for the top unit of stacked units or for each unit otherwise. Do not stack any component other than CH's on your P1 nor use the aluminum top covers in the middle of a stack of units.

  • Page 15: Connections

    Connections This section provides information on how to connect your P1 phono stage to the rest of your system. Please connect your P1 in the same order as this chapter describes, starting with the audio connections and ending with the mains connections.

  • Page 16: Audio Connections

     The MC1 and MC2 current inputs are mainly dedicated to MC cartridges. Although connecting an MM cartridge to a current input will do no harm to the cartridge nor the P1 input, the overall gain achieved in the phono stage will probably be too low, even with the P1 gain set to maximum.

  • Page 17: Ground Connection

    These sockets can be used to connect the ground of the turntable. Experimentation will define which socket to use. A couple of banana plugs are provided with the P1 unit. The ground lead from the turntable can be screwed to the banana plugs which in turns can be inserted into the back panel sockets.

  • Page 18: Operation

    Operation The P1 phono stage is operated either from the unit's front panel or from a tablet using the CH Control App. 6.1 Front panel Front panel elements (1) Standby LED (2) Five user control push-buttons (3) Display area (high-definition display) The standby LED lights up when the unit is in standby.

  • Page 19: Front Panel Push-Buttons

    6.2 Front panel push-buttons The push-buttons located on the front panel of the P1 unit allow the user to access the unit's settings through a series of menus. Front panel push-buttons Button number Button symbol Description Standby (long push) / Mute/Unmute (short push)
  • Page 20 (7) Selected input source. Each input source can be renamed through P1's menu Displayed elements depend on the user settings. In the example above, an X1-powered P1 is set as a dual-monaural phono stage, MM/MC voltage mode input is selected. The RIAA equalization curve is selected, the subsonic filter is engaged and a 4.7 kOhm loading is applied to the cartridge.

  • Page 21: Shortcut Mode

    6.3.2 Shortcut Mode The P1 phono stage settings are accessible through a set of menus as described in the next sections. However, to have quick access to the most frequently used configuration menu items, the P1 offers the concept of Shortcuts. Shortcuts are fully programmable and the user may choose almost any configuration parameter as a Shortcut.

  • Page 22: Menu Mode

    6.3.3 Menu mode The Menu mode allows the Configuration and Setup of the P1 phono stage. Menu mode is entered from the last Shortcut item (see above). From Normal mode, enter the Shortcut mode by pushing the OK [R] button. By successive OK [R] button pushes, step to the last Shortcut item (DETAILED SETUP) and push the TOP [N] button once to enter the Menu mode.
  • Page 23 Following illustration shows the elements of a the P1 SETUP Menu page, the entry point to the P1 menu structure. P1 SETUP screen items (1) Menu title. When entering a menu item, the title also shows the parent menu. If the AUDIO SETTINGS menu is entered, the title line would display P1 SETUP >>...
  • Page 24 P1 SETUP >> AUDIO SETTINGS menu items (1) Menu title. P1 SETUP >> AUDIO SETTINGS shows that the parent menu is P1 SETUP. By pushing the CANCEL [Q] button, the unit returns to the parent menu. (2) This is the Parameter Value column. For each item in the Parameter column, the Parameter Value item on the same line indicates the current value of the Parameter.
  • Page 25 (2) The current Parameter Value is highlighted. Push the UP [N] or DOWN [O] buttons to navigate through Parameter Values (3) Other possible Parameter Value(s). Number of other Parameter Value(s) depends on Parameter (4) Parameter for which the Parameter Value can be modified in the current menu. Rev 1.1 P1 User Manual...

  • Page 26: Unit Menus

    Menu mode and how to navigate through menu items). Please note that configuring your P1 can easily be done on a tablet using the CH Control Android App. Please refer to chapter 5.4 for more information about how to link the P1 to your tablet. Besides, for more information about the CH Control App, please visit our Facebook page (www.facebook.com/chprecision) where you can watch a video describing the main functionalities of the App.

  • Page 27: Display Settings Menu

    LED ON/OFF None Allows to select if the LED is off or on when the P1 is Any string INPUT RENAMING None Used to rename any input in the P1...

  • Page 28: Shortcuts Menu

    A-shaped USB port RESET ALL SETTINGS Reset None Selecting 'Reset' returns the P1 to its factory settings. Serial number Serial number indicates the serial number of the P1. SERIAL NUMBER None This parameter is read only. SHORTCUTS Default mapping None Selecting 'Default Mapping' returns the P1's Shortcuts to their factory settings.

  • Page 29: Installed Options Menu

    Track 1 on side 2 of the This wizard helps obtaining the best signal to noise WIZARD CH Precision P1 ratio and a P1 output level close to standard line phonostage calibration level sources (such as the CH Precision C1 DAC) record must be used...
  • Page 30 IP SETTINGS Auto (DHCP) Connection to a router Auto should be selected if the P1 is connected to a Direct-Link via its RJ-45 Ethernet router with DHCP server feature. Manual...

  • Page 31: Adjust The P1 To The Cartridge

    8.3 Optimal gain selection In order to obtain the best signal-to-noise ratio and a P1 output level close to line level sources (such as the CH Precision C1 DAC), a gain wizard has been programmed into the P1. It can be found in FACTORY SETTINGS > GAIN SELECTION WIZARD.

  • Page 32: Firmware Update

    9.1 Preparing the USB Stick The firmware of all the CH Precision units can be updated using the USB port located at the back of the unit. Before starting the firmware update, it is necessary to load a USB stick with files containing the new firmware. Use a FAT32 formatted USB 2.0 stick.

  • Page 33: Troubleshooting

    Check that your P1 is properly connected to your line level preamplifier No sound Your P1 is muted (display area 2 7 must be off for the unit to output signal). Unmute using the top (“7” is displayed) front panel button...

  • Page 34: Specifications

    11 Specifications General User control Front panel push-buttons and/or CH Control Android App Display 480×272 24bits RGB AMOLED Power supply Selectable 100V, 115V or 230V AC, 47Hz to 63Hz Power consumption (Standby) < 1W Power consumption (Normal operation) 40W average...
  • Page 35 > 400kHz (RIAA equalization filter disconnected), current input selected Equivalent input noise (EIN) Without the X1 External power supply connected to the P1: Current inputs: <-135dBu; 1 Ohm termination, gain +70dB, 22kHz BW Voltage input: <-130dBu; 1 Ohm termination, gain +70dB, 22kHz BW With the X1 External power supply connected to the P1: Current inputs: <-138dBu;...

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