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2.3.3.V2 (v21) Remote Control

V2 Controller | Firmware version 2.1.x

The specific Apple Remote functionality described below is applicable to any V2 based LDR preamp with earlier version 2.1.x firmware. Owners are encouraged to update their firmware to latest version of 2.2 after which you should refer to Apple Remote 2.2. section above.

You can tell which version firmware you have but viewing the display when power is applied to the preamp. If 3 digits are displayed in sequence in the right display then you have version 2.1 firmware. If 3 digits are displayed simultaneously using both displays then you already have some version of 2.2 firmware.

Apple remote buttons

 

 

Apple Remote Controls

The Apple Remote is a simple 7 button IR remote from which more than only 7 control functions are derived. The control functions of each button will vary depending on whether the preamp is turned on or off and depending on the current control mode of the preamp.

The control functions of the Apple Remote are shown in the 2 tables below. The first table describes the control functions and modes. The second table summarizes how each control button relates to the control function.

Control Functions/Modes

Function/Mode Power Button(s) Description
Power On/Off n/a Power Pressing button toggles the unit on and off
Volume Adjust On Raise/Lower Raises and lowers the volume by 1 step for each press
 Volume Mute On Mute Toggles the mute status of the unit
Brightness Adjust On Enter, Raise, Lower To place unit into Brightness Adjust mode:

  • Older LDR3x.V1 – Press Mute to first mute the unit. Adjust brightness while unit is muted.
  • Newer LDR3x.V1 – Press Enter button while in Volume Adjust mode
  • LDRx, LDRxB, LDR3.V2, LDR3.V2K, LDR3x V2 and V2.1 –  Press Center twice while in normal Volume Adjust mode to switch unit to Brightness Adjust Mode.

Right display shows brightness level between 0 and 15. Use Raise/Lower buttons to adjust brightness. Press Enter button again to confirm/save new setting, exit Brightness Adjust mode and return unit to Volume Adjust mode.

Input Adjust On Right, Enter Press Right button to switch to next input. Unit will immediately mute and right display will show selected input. Press the Enter button to lock in the selection, un-mute the unit, and return unit to Volume Adjust mode.
Balance Adjust On  Mute, Left, Right, Enter Press Mute button to first mute the unit. Then press Right button switch unit to Balance Adjust mode. Displays will blink. Right display will show double digit value. Balance towards right channel will show in right digit. Balance towards left channel will show in left digit. Use Left and Right buttons to adjust balance as you like. Press Center button to lock in balance adjustment, un-mute the unit, and return the unit to Volume Adjust mode.
Balance Reset On Mute, Left Press Mute button to first mute the unit. Then press Left button to reset Balance Adjust to neutral. Unit will automatically un-mute and return the unit to Volume Adjust mode.
Auto-Cal Off Enter, Right Press Enter button to enable auto-calibration. Unit will cycle through each of 4 LDRs showing LDR number in left display and step number in right display. There are 70 calibration steps for each LDR. Upon completion of 4th LDR, unit will shut disable auto-cal and shut off display.
Impedance Adjust On Left, Raise, Lower, Enter  Press the Left button to display the current Impedance Number (1-5). Press the Left button again to display the Impedance Level (1k-99k) associated with the current Impedance Number. Press the Left button repeatedly to toggle between displaying the Impedance Setting number and its associated Impedance Level.To switch to a different Impedance Number (1-5) use the Raise/Lower buttons while displaying the Impedance Number. This will immediately switch the preamp over to using the Impedance Level associated with the Impedance Number you selected. If you switch to an Impedance Number that has not been  installed yet (has not been run through an Auto-Cal cycle), the audio output will likely shut off due to an absence of calibration settings for that Impedance Number/Level.If you wish to change the Impedance Level associated with the currently selected Impedance Number, switch display to Impedance Level (via Left button), then use Raise/Lower buttons to adjust impedance between 1k and 99k. The default setting is 20k. To lock in this new setting you must first press the Enter button and then run Auto-Cal for that new Impedance Level. If you do not run Auto-Cal immediately after changing the Impedance Level of the currently selected Impedance Number, the Impedance Level will not actually change.
Pre-Cal Off Raise, Right Caution! Do not attempt the Pre-Cal process unless you have both the proper precision resistors and have carefully studied the pre-cal documentation. Pre-Cal requires the removal of all 4 LDRs and temporarily replacing them with a set of precision resistor modules with both 100 ohm and 100k ohm resistors. Use the 100 ohm resistors first. Also, Pre-Cal requires dual display modules. After the pre-cal resistors are installed, proceed to place the unit into Pre-Cal mode.First place unit in Auto-Cal mode. Then press the Raise button 3 times to switch unit to Pre-Cal mode. When the calibration factor on the display stabilizes, press the Right button to switch to the next LDR/resistor. Repeat for next 3 100 ohm LDR/resistors. Then switch all 4 precision resistors over to 100k. Repeat the process of stabilizing the  display value and pressing the Right button four more times. At the conclusion of this process you will have pressed the Right button 8 times. The eight time will end the Pre-Cal process and blank the display. The results of the pre-calibration will be save in memory.

Control Functions Summarized By Button

Button Power Mode Function
Enter Off Auto-Cal turns auto-cal on/off
  On Volume Adjust does nothing except blinks display
  On Input Adjust locks in selected input, blinks display, and returns unit to volume adjust
  On Balance Adjust locks in channel balance, blinks display, and returns unit to volume adjust
  On Brightness Adjust locks in brightness level, blinks display, and returns unit to volume adjust
  On Impedance Adjust locks in changes to Impedance Number/Level, blinks display, and returns unit to volume adjust
Raise Off Info Display move info display up 1 step
  Off Auto-Cal press 3 times to enable Pre-Cal Adjust
  On Volume Adjust increase volume 1 step (0-70)
  On Brightness Adjust increase brightness 1 step (0-15)
  On Impedance Adjust increase impedance setting (1-5) or level (1k-99k)
Lower Off Info Display move info display down 1 step
  On Volume Adjust decrease volume 1 step (0-70)
  On Brightness Adjust decrease brightness 1 step (0-15)
  On Impedance Adjust decrease impedance number (1-5) or level (1k-99k)
Left Off n/a does nothing
On Balance Adjust moves channel balance 1 step left
On Impedance Adjust toggles between display of impedance number (1-5) and level (1k-99k)
Right Off n/a does nothing
Off Auto-Cal switches auto-cal to next LDR, shuts off auto-cal if already at 4th LDR (not recommended)
Off Pre-Cal switches pre-cal to next LDR (required), 1st 4 steps are 100 ohm, 2nd 4 steps are 100k ohm
On Input Adjust mutes the unit and switches unit to next input
On Balance Adjust moves channel balance 1 step right
Power Off n/a turns unit on
On n/a turns unit off
Mute Off n/a does nothing
On Volume Adjust toggles muting – mute ramps volume down to zero, un-mute ramps volume up to prior setting

 No Auto-Repeat

The Apple Remote does not repeatedly send commands if you hold down the Raise or Lower buttons to adjust volume. Therefore each Raise/Lower button press increments/decrements the volume by 1 step count only.

Pre-Cal & Impedance Adjust Functions

  • Pre-Cal and Impedance Adjust functions were added on 1.15.15 along with the release of version 2.1.0 of the LDR3x firmware.
  • These functions are not present in earlier versions of the firmware.
  • All LDR3x.V2.1 boards and LDR preamp products shipped on or after 1.15.15 include 2.1.0 or later versions of the firmware.
  • All Tortuga Audio preamp products with USB connections can be updated  with latest version of firmware to add these functions.

Apple Remote Bug:

  • Units affected:  All LDR units shipped on or after 10.1.13 but before 12.7.13
  • The Bug: Pressing the Left or Right button again after having switched to a new input (but before having confirmed the change via pressing the Enter button), will either put the unit into Balance Adjust Mode (if you pressed the right button again) or will Reset the Balance (if you pressed the left button again).  The reason this happens is switching inputs mutes the unit and when muted the Left/Right buttons control Balance Adjust Mode/Reset.
  • The Work Around: When switching inputs you can only press the Left or Right buttons once and then must immediately confirm and lock-in the new input by pressing the Enter Key. Repeat this cylce until you’ve selected the desired input.
  • The Fix: All LDRx units shipped on or after 12.7.13 have corrected software where pressing the Left or Right button will immediately switch over to the next input such that hitting the Enter key to confirm and lock-in the input change is no longer required.
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