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Table of Contents
Summary of Contents for BLUE SKY AMC
- Page 1 AUDIO MANAGEMENT CONTROLLER (AMC) MANUAL Page 1...
- Page 2 The Blue Sky Audio Management Controller (AMC) is an 8-channel audio DSP platform with both 24-bit digital and analog I/O. Each channel of the AMC has a sample rate converter (by stereo pair), a 31 band 1/3 octave equalizer, eight parametric / free assignable filters, individual channel delays, and lip-sync delay.
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Page 3: Table Of Contents
Overview ..........................23 Additional equipment you will need ..................23 Measuring and optimizing your speaker system ..............24 Guidelines on microphone setup ................... 25 Setting up the ART USB Dual Pre to use with Blue Sky SRO Software......... 26 Page 3... - Page 4 Setting up the ART USB Dual Pre for use with the AMC SRO ..........27 The SRO Main Screen ........................28 Target Curves ..........................30 AMC Specifications ........................32 Page 4...
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Page 5: Amc Features
AMC Features o 8 balanced analog inputs and outputs with switchable +12 / +24 dBu maximum levels o 8 AES 110 ohm digital inputs and outputs, each transformer Isolated o Burr Brown / TI PCM1792A digital to analog converter with 132 dB SNR o Burr Brown / TI PCM4222 analog to digital converter with 124 dB SNR. -
Page 6: Amc I/O Connections
AMC sample rate. The internal sample rate can be set as a global parameter to 48 kHz or 96kHz through the menu on the remote. NOTE: Setting the sample rate, 48 kHz or 96 kHz, will reset the AMC rack unit and load the new sample rate into the software program. -
Page 7: External Mute Input
To use an external voltage trigger voltage to mute the rack, connect the trigger source across pin 4 and 5. Applying 5 volts will mute the AMC. Removing the 5 volts will un-mute the AMC. When the AMC is muted externally, the remote will display the mute status. -
Page 8: Remote Cable
Any preset can be reconfigured to analog, digital or a mix The display will show a brief description of the selected presets. These presets can be modified on a limited basis using the menu on the remote, or completely reconfigured using the AMC Control Software. -
Page 9: The Amc Remote
MUTE – mutes all channels, both digital and analog REF – sets the system gain to a user defined reference level. The default setting is -20 dB. The default setting can be changed using the remote menu or the AMC Control Software. Page 9... -
Page 10: The Menu
DIM/CANCEL – sets the system gain to a user defined level. The default setting is -30 dB. The default setting can be changed using the menu or the AMC Control Software. The DIM/CANCEL switch is also used to exit the menu mode MUTE MODE –... -
Page 11: Menu Items
8) System sample rate – selects an internal system sample rate of either 48 or 96 kHz. Changing the sample rate can only be done through the AMC remote and will reset the system. It is recommended that the user exit the AMC control program before doing this. -
Page 12: Firmware Updates
If you get a message that the program requires Elevation and will not run, right click on the installer and click Run As Administrator. 3. Power down the AMC RACK and plug-in the USB cable. If this is first time you've connected the AMC Rack to your computer, you may get a message that the computer Is installing drivers for the USB interface. -
Page 13: Upgrading The Firmware In The Amc Remote To The Latest Version
If you get a message that the program requires Elevation and will not run, right click on the installer, and click Run As Administrator. 3. Disconnect AMC Remote and plug-in the USB cable. If this is first time you've connected the AMC Remote to your computer you may get a message that the computer is installing drivers for the USB interface. -
Page 14: The Amc Control Software
Mute button is lit. . Plug the USB cable into the front of the AMC. If this is the 1st time you have connected the AMC to your computer, you may see a message that says USB detected, installing software. Wait until this process is complete and the LED on the front of the AMC goes back to flashing. -
Page 15: Amc Main Control Panel
AMC Main Control Panel This is the main setup screen for the AMC control program. It shows which preset is loaded in the AMC, and the current configuration of that preset. The AMC control program and the AMC rack are interlinked through the USB connection so that actions on the remote, such as changing the system gain, will be reflected in the AMC program and vice versa. - Page 16 Reference gain - system gain when Ref Gain Switch is pressed Dim gain - system gain when Dim Gain Switch is pressed System sample rate - AMC internal sample rate. The system sample rate cannot be modified through the AMC control program and can only be modified using the remote.
- Page 17 Save presets to file - saves all 6 presets to a text file. Used to archive presets or to provide a backup if an AMC has to be restored Load Presets from file - loads a complete set of 6 from a text file.
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Page 18: Cross Mixer
The gray buttons along the bottom of the screen configure the mixer to a variety of common setups. These buttons only program the cross mixer and do not affect the bass management settings. To go back to the main AMC control screen click the X in the upper right-hand corner of the screen Page 18... -
Page 19: Bass Management
Bass Management The bass management screen shows the bass management settings for each individual channel and the graphs show the resulting frequency response of the crossover filters only, without equalization For each channel the type of filter employed and the cutoff frequency of that filter can be selected. The filter labels have the following meanings: Bypass No filter in circuit... - Page 20 HP2 or HPBW4 are used depending on the actual speaker attached to the channel. If the speaker is made for bass management, (i.e., Blue Sky SAT6D) then you would use HP2 set to 80 Hz. If however, if the attached speaker is a full range monitor that may go down to 50 or 40 Hz, you'd use a HPBW4 to get a better blend with the subwoofer.
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Page 21: Eq Screen
Each channel of the AMC has a 31 band 1/3 octave graphic equalizer and 8 uncommitted filters. Graphic EQ - the AMC has a 31-band 1/3rd octave EQ. Clicking on the slider, holding the left mouse button, and moving the slider up and down can change the graphic EQ values. The upper graph will show any changes to the filters. - Page 22 Save EQ to Presets - saves the displayed EQ setting to any preset. This feature is commonly used to copy EQ data from one preset to another preset. Display EQ channels - switches the screen to a different EQ without having to close and re-open the screen Page 22...
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Page 23: Speaker Room Optimization (Sro)
The target curve can be an “X” curve, a flat frequency response curve, or an arbitrary curve that the user created. To find the combination of filters that best corrects the desired frequency response target, the AMC control software uses a proprietary genetic mutation algorithm called BOO. -
Page 24: Measuring And Optimizing Your Speaker System
3. Set the USB audio interface is the default recording and playback device and it is set up with the correct properties. (See page 21). 4. Connect a USB cable to the front of the AMC and computer and when ready start the AMC control program. Go to the SRO Screen (page 23) 5. -
Page 25: Guidelines On Microphone Setup
the view. 12. Once the process is complete you can click on any of the small EQ graphs to expand them and to check the filters or to manually tweak him to your own liking. Page 18 13. Once you are satisfied with the results, you can close out the SRO screen, and save the preset. -
Page 26: Setting Up The Art Usb Dual Pre To Use With Blue Sky Sro Software
Setting up the ART USB Dual Pre to use with Blue Sky SRO Software. 1) Plug the short TRS to XLR male cable from the Dual Pre right output to the Dual Pre right microphone input. 2) Set the mix fader to computer (Max CW). -
Page 27: Setting Up The Art Usb Dual Pre For Use With The Amc Sro
Setting up the ART USB Dual Pre for use with the AMC SRO 1) Using a microphone stand set the measurement microphone at your listening position and at ear height. 2) Connect the microphone to LEFT in on the ART USB Dual Pro. Set the gain control on the LEFT input to 18. -
Page 28: The Sro Main Screen
The SRO Main Screen This screen shows the current state of the EQ, target filters, measured frequency response and corrected frequency response of all the channels. Clicking on the any of the small graphs will open up a larger graph. NOTE: You can't optimize a channel until you measure the channel. - Page 29 If the level is low, increase the gain on the remote control. If the measured response is too low, the noise floor of the room and or the microphone may prevent an accurate measurement. Normally when optimizing a Blue Sky system, the remote gain control is set for 0dB. Page 29...
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Page 30: Target Curves
To review or adjust the Target curve for any speaker, click on the target curve, which will bring up the following screen. In all AMC control software above rev 4.11, all target curves are saved to a file when any target curve is modified. Therefore, when you re-start the AMC control program in a new session, the program will remember your target curves without having to re-create them from scratch. - Page 31 Gate time in milliseconds - this value sets how much of the impulse response is used to calculate the frequency response. The AMC SRO program uses a Blackman – Harris window function on the impulse response when calculating frequency response. The gate time determines how much of the low frequency content of the impulse response to include in calculating frequency response.
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Page 32: Amc Specifications
AMC Specifications Analog Noise Floor -106 dBu / -96dBu (20 Hz - 20 kHz flat) +12/+24 Analog Dynamic Range 118 dB Maximum Analog Input +12 dBu / +24 dBu Maximum Analog Output +12 / +24 dBu Analog THD + N .002% +4 dBu In (20 Hz -20 kHz) Digital THD + N .00002% -20 dBFS (20 Hz - 20 kHz)