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Crane Song Avocet IIA Quantum DAC Manual
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Crane Song Avocet IIA Quantum DAC Manual

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Avocet IIA
Quantum DAC
VER 2 20151022
New DAC
The Quantum DAC is the 5th generation design from Crane Song with ultra low jitter.
The Quantum DAC uses 32 bit a converter and ASRC for jitter reduction up sampling to
211KHz. Avocet has always upsampled to 211KHz. The reference clock has less then
1pS, 0.5pS typical 1Hz to 100KHz and a proprietary reconstruction filter for accurate
time domain response.
New
Direct sub woofer outputs for each of the three output have been added.
The output levels are now programmable in 0.25 db steps for speaker level matching

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Summary of Contents for Crane Song Avocet IIA Quantum DAC

  • Page 1 VER 2 20151022 New DAC The Quantum DAC is the 5th generation design from Crane Song with ultra low jitter. The Quantum DAC uses 32 bit a converter and ASRC for jitter reduction up sampling to 211KHz. Avocet has always upsampled to 211KHz. The reference clock has less then 1pS, 0.5pS typical 1Hz to 100KHz and a proprietary reconstruction filter for accurate...
  • Page 2 NOTE: There is information in the Avocet II manual that applies to the Avocet IIA This information will be added to this doc at some point in time...

  • Page 3: Main Functions

    MAIN FUNCTIONS Truncates the digital input to 16 bits. For checking what 16 bits sounds like Channel Selection Talk back button sends the to 7.1 surround talk mic into the head- phone output. It is push-on SHIFT MODE push-off, however holding to reach the setup it for 2 seconds allows functions (they have the...
  • Page 4 CLEARING THE INTERNAL SETTINGS System Reset By pressing all three output selection buttons at the same time Avocet will reset all of it’s internal settings. This is the same as rebooting the remote. All gains, main and phones are set to zero Output 1 is the selected output DAW is the input selected Phones are set to the Aux input...
  • Page 5 TALKBACK OPERATION Talk mic is on when the LED is on. It has push-on, push-off operation or latching. However if the talk button is held for one half second or more, the talk back releases when the button is released, non latching The dim monitor level can be set when the talkback button is pushed.
  • Page 6 GAIN TRIMS Gain Trims are adjustable by plus or minus 10db on all INPUTS and the MONO function in surround If one presses and holds the input select button a second time it will enable the input gain trim mode. It requires about one half second of hold time to enter the trim mode. Trim mode allows changing the input level on the selected input relative to all other inputs.
  • Page 7 SHIFT MODE SETUP FUNCTIONS...
  • Page 8 SHIFT MODE GAIN TRIM FUNCTIONS SHIFT KEY TO ENABLE SHIFT MODE Gain trim offset clear Gain trim offset lock Gain trim unoffset lock must be in shift mode to enable these functions Gain trim can be cleared, locked or enabled by using the Shift key to reach the desired selection.
  • Page 9 SHIFT MODE SETUP FUNCTIONS Changes DIM from relative LEVEL to absoulte LEVEL Changes output 3 In the Shift Mode Select the to work in parallel source for the DAW input between with outputs 1 and 2 AES, SPDIF, OPTICAL for use as a sub woofer output Functions F1, F2 for future features...
  • Page 10 SHIFT MODE TALK BACK GAIN FUNCTIONS TALK BACK MIC GAIN is changed by selecting the TALK button when in the SHIFT MODE. Turning the gain knob changes the mic gain. The gain steps are 3 db steps to 72 db of gain GAIN...
  • Page 11 SHIFT MODE GROUP FUNCTIONS This showes the key grouping The group function is reached by the shift button and then selecting the group button. What it does, is in surround mode, it groups together Left, Right, Cen- ter to function as one button, Surround Left and Surround Right as one button, and Extra Left and Extra Right as one button...
  • Page 12 SHIFT MODE HEADPHONE SETUP Headphones / shift to select phones control Dim Button over rides Headphone mode Headphone Level The headphone source is selected by the main Selects direct AUX analog input buttons. It’s level input for the Headphone changes with the main output system level The headphone source is...

  • Page 13: Speaker / Output Setup

    SPEAKER / OUTPUT SETUP Stereo to Surround Direct Sub mode and Speaker Gain Trim By pressing any one of the speaker select buttons a second time and holding it for about 0.5 seconds will put Avocet into the speaker set up mode. If SHIFT is selected the speaker setup is disallowed.
  • Page 14 SPEAKER MODE SETUP In the speaker mode setupthe following thing are controled for each speaker or output Mono Speaker, L, R, or center for surround In OUT1 setup there is a transparent mode for surround on all outputs The transparent mode removes some of the lock outs that exist when in stereo the center speaker will be used for the mono speaker New to Avocet IIA Direct Sub Out can be turned on or off for each of the outputs...
  • Page 15 SPEAKER SETUP OUT 1 Transparent Surround Mode TRANSPARENT SURROUND SETUP DIRECT SUB MODE turning this button on By selecting this function will cause the unit to be in surround which must be set in each mode at all times output the Direct Sub (Transparent Surround `Mode) output is turned on when the mono speaker select...
  • Page 16 SPEAKER SETUP OUT 2 DIRECT SUB MODE By selecting this function which must be set in each output the Direct Sub output is turned on when the OUT2 is selected MONO SPEAKER SELECT Selects which speaker is the mono output when mono is selected Selecting the CENTER will put Avocet into...
  • Page 17 SPEAKER SETUP OUT 3 DIRECT SUB MODE By selecting this function which must be set in each output the Direct Sub output is turned on when the OUT3 is selected MONO SPEAKER SELECT Selects which speaker is the mono output when mono is selected Selecting the MONO SPK will put Avocet into...
  • Page 18 DUAL FUNCTION ON THE ACCESSORY CONNECTOR Stereo Accessory pin out Original Accessory pin out Avocet IIA shipped configured for stereo will have the Accessory connector configured in the stereo mode. This uses the Tascam style of signal assignment. Any one who upgrades from and earlier version and uses the Accessory connector may need to move the internal ribbon cable...
  • Page 19 DUAL FUNCTION ON THE ACCESSORY CONNECTOR The accessory connector can have 2 different functions In the Avocet IIA stereo mode the accessory connector has the following signals avaliable using the Tascam pinout. All outputs are line level In Surround configurations the pin out has not changed. The Accessory connector pinout can be changed by moving an internal ribbon cable between 2 different ports CH1= Direct Sub Right CH2 = Direct Sub Left...
  • Page 20 ACCESSORY CONNECTOR PINOUT DETAILS SURROUND MODE Right Channel Source Output talk mic output - When talk button is pushed (Mic Output) Right phones out (Line level phone bus) Left phones out (Line level phone bus) gnd / ground data I/O do not connect Surround mono input 6 Surround mono input 5 Left Channel Source Output...
  • Page 21 QUANTUM DAC JITTER MEASUREMENT The jitter value in this measurement from 1Hz to 100KHz is 0.54pS typical measured with a Symmetricom 3120A using a Stanford Research Systems Rubidium Frequency Standard, PRS10 Without info on the measurement bandwidth and test instrument used, the measurement is impossible to know about Test Software does not make a distinction between random and deterministic jitter.
  • Page 22 44 femto Seconds Jitter measured from 10Hz to 20KHz is 0.044pS or 44 fS typical measured with a Symmetricom 3120A using a Stanford Research Systems Rubidium Frequency Standard, PRS10 without info on the measurement bandwidth and test instrument used, the measurement is impossible to know about Test Software does not make a distinction between random and deterministic jitter.

  • Page 23: Configuration Jumpers

    CONFIGURATION JUMPERS Do not change unless one is certain that you understand what they do They are fractory set. Provided for reference...
  • Page 30 QUANTUM DAC PCB SHOWING GAIN TRIMS AND JUMPERS Meter Gain Trim Meter Gain Trim Meter Master = jmp on Surround Slave = jmp off...