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.
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 2
MAIN FUNCTIONS Truncates the digital input to 16 bits. For checking what 16 bits sounds like Channel Selection to 7.1 surround Talk back button sends the talk mic into the headphone output.
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.
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. The monitors can be dimmed to off or a level that is below feedback. This will allow comminution in both directions while in talk mode.
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. Gain trim has an offset range of plus or minus 10 db in 1 db steps. It is adjusted by turning the GAIN knob.
SHIFT MODE SETUP FUNCTIONS 7
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. Clearing the offsets set all input trims and the mono trim to 0 so all inputs are at the default setting. The mono trim works in surround mode only.
SHIFT MODE SETUP FUNCTIONS Changes DIM from relative LEVEL to absoulte LEVEL Changes output 3 to work in parallel with outputs 1 and 2 for use as a sub woofer output In the Shift Mode Select the source for the DAW input between AES, SPDIF, OPTICAL .
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.
SHIFT MODE GROUP FUNCTIONS This showes the key grouping The group function is reached by the shift button and then selecting the group button.
SHIFT MODE HEADPHONE SETUP Headphones / shift to select phones control Dim Button over rides Headphone mode Headphone Level Selects direct AUX analog input for the Headphone output The headphone source is selected by the main input buttons. It’s level does not change with the main system level 12 The headphone source is selected by the main input buttons.
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. Selecting the center channel button will cause the center channel be the mono speaker when selecting mono.
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 Level matching of the 3 speaker outputs is set by turning the knob, external pads
SPEAKER SETUP OUT 1 Transparent Surround Mode TRANSPARENT SURROUND SETUP turning this button on will cause the unit to be in surround mode at all times (Transparent Surround `Mode) the mono speaker select function determines the active speakers when mono is selected DIRECT SUB MODE By selecting this function which must be set in each output the Direct Sub output is turned on when the OUT1 is selected MONO SPEAKER SELECT Selects which speaker is the mono output when mono is selected Selecting the CENTER wi
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 Surround mode for the selected output The OUTPUT LEVEL of each speaker may be trimmed down for speaker level matching And setting up the system so that the normal listening level is around 0 on the dial.
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 Surround mode for the selected output The OUTPUT LEVEL of each speaker may be trimmed down for speaker level matching And setting up the system so that the normal listening level is around 0 on the dial.
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.
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.
ACCESSORY CONNECTOR PINOUT DETAILS SURROUND MODE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Right Channel Source Output gnd gnd 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 gnd gnd gnd Surround mono input 6 Surround mono input 5 Left Channel Source Output mono out talk command in - enable by tying to gnd mute+ mute-, solosolo+ used in surround wiring from l
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. AES-12id-2006 (r2011) excludes modulation components below 10 Hz in it’s jitter definition.
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. AES-12id-2006 (r2011) excludes modulation components below 10 Hz in it’s jitter definition.
CONFIGURATION JUMPERS Do not change unless one is certain that you understand what they do They are fractory set.
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
DO NOT INSTALL THE FIRMWARE UPDATE JUMPER WITH OUT THE ROM INSTALLED, DOING SO WILL CAUSE LOSS OF OPERATION
D/A Gain Trims QUANTUM DAC PCB SHOWING GAIN TRIMS AND JUMPERS Meter Gain Trim Meter Gain Trim Meter Master = jmp on Surround Slave = jmp off 30
