Product Documentation

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2.3.1.V25 Remote Control

V25 Apple Remote Control Scheme

The following information applies to the use of the Apple Remote for controlling Tortuga Audio preamps built withe the V25 preamp controller which was officially released April 1, 2017.

The Apple Remote shown below is Apple’s standard “silver” remote. It’s 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 the control mode the preamp is in as explained below.

tortuga audio apple remote control buttons

Control Modes

There are six (6) control modes with Volume Adjust mode always being the default.

In addition to the default Volume Adjust mode the 5 other control modes are:

  • Input Adjust
  • Impedance Adjust Mode
  • Display Adjust
  • Max Volume on Input Change Adjust
  • AutoCalibration Start/Stop

Navigation between the control modes follows a few simple rules as follows:

  • Each press of the Control Mode button switches the preamp sequentially to the next mode.
  • The 6th press returns the preamp back to its default Volume Adjust mode.
  • Pressing the Center/Enter button at any time returns the preamp to its default Volume Adjust mode.
  • When the preamp is in Volume Adjust mode, pressing the Center/Enter button will cause the display to briefly flash acknowledging the command and that the unit is in Volume Adjust mode.

Control Changes With OLED Firmware

The following applies only to users with V25 preamps and 7-segment displays who elect to upgrade their firmware to the 2xx series OLED firmware yet retain the 7-segment displays.

The 2xx series OLED firmware makes the following changes to the Apple Remote control buttons:

Control Mode Button – The “Menu” button on the lower left of the remote is now the Control Mode Button. As before, the Menu button also turns the preamp on when it’s off.

Mute Button – The lower right button of the remote (with the >=  play/pause symbol) is now the Mute Button.

Please note that these changes are NOT reflected in the detailed control instructions presented below which reflect the origianal 7-segment only version of the V25 firmware.

Remote Control Functions

Each of the remote control functions and control modes are shown below in two different formats; a graphic version with a mock-up of the dual displays, followed by a tabular list version.

Graphic Depiction

remote_2.2_turnon
Preamps with versions 1019 or higher firmware do not have to wait for the mute ramp down to zero to complete before pressing the lower button. A quick tap of the Mute->Lower buttons will shut off the preamp. 

v25 apple remote volume adjustment

remote_2.2_muting

remote_2.2_balanceadjust

v25 apple remote control modes

Important! – Preamps with only a single input will only have four (4) controls modes since the Input Adjust mode is disabled. 

remote_2.2_inputadjust_slow

remote_2.2_inputadjust_fast
remote_2.2_impedanceadjust

remote_2.2_displayadjust

remote_2.2_maxvolumeadjust

v25 apple remote autocalibration mode

Tabular Listing

The table below lists all the V25 remote commands/sequences.

Function/ModeButton(s)Description
Turn OnMenuPressing button turns the unit on.
Turn OffMenu There are 2 ways to turn off the preamp depending on the firmware version in your preamp.

1-step turn off (prior to firmware rev 1016) - Press/hold the Menu button and then release. Note that if held down too long unit may turn back on and if held down too briefly will result in muting the preamp but not turning it off.

2-step turn off (starting with firmware rev 1016) - First mute the unit by briefly pressing the Menu button. When the volume has fully ramped down to zero, a subsequent press of the Lower button will turn off the preamp. Starting with firmware rev 1019 you don't have to wait for the ramp down to finish - just a quick 2 button Mute->Lower press will shut off the preamp.
Volume MutingMenuBrief press of Mute button will mute or unmute the unit. The volume will ramp down to zero when muted. When unmuted the volume will ramp back up to its prior setting.
Volume AdjustUp/DownRaises and lowers the volume by 1 step for each press. Holding down the buttons will cause the command to repeat.
Balance AdjustLeft/RightWhile in the default Volume Adjust mode, use the left/right buttons to adjust the channel balance 1 step to the left or right a maximum of 20 steps either way. Each step changes channel balance by ~0.5 dB. As channel balance continues to skew towards a given side (left or right), the combined volume level of both sides will automatically adjust to maintain the same overall volume level.
Control ModesModeIn addition to the default Volume Control mode there are 5 other control modes as listed below. The modes are accessed by sequentially pressing the Mode button (lower right) on the Apple remote. At any time, pressing the Center button on the remote will return the unit to the default Volume Control mode.

0) Volume Adjust Mode - default
1 Input Adjust Mode
2) Impedance Adjust Mode
3) Display Adjuse Mode
4) Max Volume On Input Change Mode
5) Auto Calibration Mode

Each of these modes are explained below.
Input Adjust Mode (Slow)Mode, Raise/Lower & Left/RightPressing the Mode(play) button once will switch the unit into Input Adjust mode. The right display will show the currently selected input number. The left display will show the prior volume level associated with that input when it was last selected.

Music will continue to play on current input channel while while the preamp is in Input Adjust mode and you make your input selection.

Use the raise/lower buttons to adjust the input to desired number.

Press the Center/Enter button to activate the newly selected input and return to volume control mode.

If you select the same same input as your're currently listening to, nothing happens upon pressing the Enter button and returning to volume control mode.

If you select a new input, pressing the Enter button will cause the existing input signal volume to ramp down, the new input to then be connected, and the new input volume to ramp back up.
Input Adjust Mode (Fast)Mode, Left/RightPressing the Mode(play) button once will switch the unit into Input Adjust mode. The right display will show the currently selected input number. The left display will show the prior volume level associated with that input when it was last selected.

Unlike the Slow Mode described above, the Fast Mode immediately changes the input without first muting the volume.

Use the left/right buttons to change inputs immediately.

There will be a brief 200 millisecond delay in fast switching the inputs which will hardly be perceptible.
Impedance Adjust ModeMode, Raise/LowerPressing Control Mode (play) twice will switch the unit into Impedance Adjust mode. The left display will show the impedance setting number (1 through 5) and the right display will show the impedance level (in xxK ohms) associated with the currently selected impedance setting number.

Use the raise/lower buttons to change the impedance setting number (1-5). Use the left/right buttons to change the impedance level for the currently selected impedance setting. Press the Center/Enter button to exit Impedance Adjust mode and return to volume control.

Changing the impedance setting number will instantly change the preamps impedance to the level associated with the setting number provided that this setting and its associated level have already been run through the auto-calibration process.

If you switch to an impedance setting number (1-5) that has not already been initialized through auto-calibration then selecting it will result in the audio being turned off. This is the single most common error users make when working with the Adjustable Impedance feature.
Display Adjust ModeMode, Raise/Lower & Left/RightPressing Control Mode (play) three (3) times will switch the unit into Display Adjust mode.

BRIGHTNESS ADJUST

The right display will show the brightness level number between 0-15.

Use the raise/lower buttons to change the brightness level. Press the Center/Enter button to exit the Display Adjust mode and return to volume control.

TIMEOUT ADJUST

Timeout allows you to cause the display to turn off at the selected number of seconds after prior command input via the remote. Timeout only works when in Volume Adjust Mode and is disabled when the preamp is in any other control mode.

The left display will show the timeout number between 0 and 99 seconds. If set at 0 the display timeout feature is disabled. The minimum timeout setting is 5 seconds.

Use the left/right buttons to adjust the timeout to desired level. Press the Center/Enter button to exit the Display Adjust mode and return to volume control.
Max Volume On Input Change Adjust ModeMode, Raise/LowerPressing Control Mode (play) four (4) times will switch the unit into Max Volume On Input Change mode. The left display will be blank. The right display will show the maximum volume allowable when switching to a new input or when the unit is first turned on. This can be adjust between 1 and 99. The initial default value is 50. This protects your audio gear (speakers!) from accidentally going to full volume when switching to an input they may have been at or near full volume when previously selected as would be the case if the preamp was being used in a home theater bypass scenario.

Use the raise/lower buttons to change the max volume on input change level. Press the Center/Enter button to exit the max volume on input change adjust mode and return to volume control.
Auto Calibration ModeMode, RightPressing Control Mode (play) button five (5) times will switch the unit into Auto Calibration mode

Both displays will initially show 0 upon entering the auto-cal mode.

Press the Right button 3 times to enable auto-calibration. The right display will show the count up as you press the button.

Once enabled the unit go through several stages of calibration. The first stage involves making 4 adjustments during which time a 4 digit number will be displayed typically ranging from 1500-1850. If the preamp does not cycle through these 4 adjustments within say 30 seconds or so that's an indication one or more LDRs may be having a problem. If there's a problem the numbers will either continue to increase or decrease steadily until hitting some upper or lower limit and then remain fixed.

The unit will the proceed to cycle through each of 4 LDRs showing the LDR number in left display and the calibration step number in right display. There are 99 calibration steps for each LDR. Upon completion of 4th LDR, unit will terminate calibration, briefly shut off the preamp, and then start the preamp again normally.

At the beginning of each LDR's calibration the step number will likely remain at step 1 for a while. That's normal. After no more than a minute the step count should proceed upwards. Sometimes the step count goes quickly and other times it may slow down quite a bit. This is normal.

If the calibration step process slows down and stops or never proceeds beyond step 1 and does not proceed after a minute of waiting that is a fairly definitive indication that the LDR whose number displayed in the left display has gone bad and needs replacement.

You can skip over an LDR any time during autocal by pressing the right button. If you skip past the 4th LDR, autocal will terminate.
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