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CCRMA Stage

The CCRMA Classroom (Knoll 317) is our main performance space.

At 7.5m X 16.7m (25 x 55 feet) it is the largest room in the building.

(XXX need photo)

Read all about the room and its sound system: Bringing the GRAIL to the CCRMA Stage (Fernando Lopez-Lezcano and Christopher Jette, LAC 2019).

Contents

In this room you should see:

• 8 rolling speaker towers
• Many more loudspeakers mounted overhead
• Stacks of chairs on the side leading to the lounge
• One Yamaha Disklavier piano
• Cabinets with drawers of cables and other supplies
• Linux workstation
• Lighting system control surface
• A rolling rack containing:
  • Yamaha DM1000 digital mixer
  • “Cookie jar” of remote controls and video adapters
  • Video switcher choosing which video signal goes to each projector
  • Some HDMI inputs to the video switching matrix
  • AC and USB power outlets
• A cute little rolling rack able to go anywhere on the floor of the room, containing:
  • MOTU 8M and 24Ai audio interfaces
  • AC power outlets
  • An HDMI input to the video switching matrix
• Two video projectors mounted overhead
• Three projection screens: one permanently on the wall near the stairs, and motorized retractable screens on the wall in front of the windows to the Courtyard and on the truss on the stairs side of the speaker dome.

Audio System(s)

The stage houses a 56.8 channel loudspeaker system with 56 individual loudspeakers and 8 subwoofers numbered in groups:

• 1–8: 8 main speakers on the rolling towers: ADAM A77X
• 9–16: 8 “big” speakers in the overhead dome: four ADAM A8X and four ADAM A7X
• 17–28: 12 small speakers on rails: ADAM A3X
• 29–42: 14 small speakers overhead at truss level: ADAM A3X
• 43–48: 6 small speakers overhead above truss level: ADAM A3X
• 49–56: 8 ground-level ADAM P22 speakers (at the bottom of the rolling towers)
• 57–64: 8 SVS SB-4000 Subwoofers (in the rolling towers)

Note that the main speakers (1-8), subwoofers (57-64), and ground-level speakers (49-56) are located in rolling towers (a.k.a. “stack”). Each has a home position (with tape on the floor marking where the tower corners belong) for the calibrated Ambisonics dome, but can also be wheeled and rotated within a large radius as needed for other activities.

Don’t touch

Stage users are expected to leave all of the following alone:

• Any “settings” physically on any loudspeaker or sub (power switch, volume adjustment)
• Any existing wiring except the cables meant to plug into your laptop
• Any equipment that is not readily accessible
• The OpenMixer Linux machine (except via the touch screen)

If you see any problems with any of the above please contact CCRMA staff.

To reset

• Return rolling towers to correct positions (if they were moved)
• Recall preset 0 on the DM1000 (if you used the DM1000)
• Raise either or both projection screens (if they were lowered)

Using Your Own Laptop

Laptop Audio

Easy stereo: Headphone jack to LTI-1 to DM1000 mic inputs 1+2.

Flexible: MOTU USB to OpenMixer

Laptop Video

Plug in HDMI to one of many numbered ports. Choose that HDMI as the source for the desired projector(s).

Projectors

“Front”: Epson Pro L1300U

“Side”: Optoma UHZ65

Partial instructions for toggling the front projector between the two possible screens:

settings
    lens position
        load memory
    geometry
        load memory

Video Routing

It’s a bit complicated to be able to do everything we want.

The video signals to the two projectors are determined by the Kramer VS62HA (manufacturer’s page) 6x2 video switching matrix. The Kramer’s 6 inputs are the 6 possible video sources:

1. The long HDMI cable normally coiled up on the side of the rack that holds the mixer.
2. An HDMI female jack on the front of the rack that holds the mixer, labeled “INPUT 2”, often holding an HDMI cable coming from the Atem video switcher (allowing us to project from video cameras)
3. An HDMI female jack on the front of the rack that holds the mixer, labeled “INPUT 3”, often holding an HDMI cable coming from the HDMI splitter on the output of the KVM switch on the desktop cart.
4. A VGA (!!) female jack on the front of the rack that holds the mixer, labeled “INPUT 4”
5. An HDMI cable on the “droid” cart
6. Apple TV

The Kramer’s two outputs are the two projectors:

• “Out 1”: The “wall” projector (pointing towards Studio E)
• “Out 2”: The “window” projector (pointing towards the Courtyard)

But it’s more complicated because we also want anything going to either projector also to be mirrored into an input of the Atem video switcher (e.g., so a concert live stream can switch to a direct full screen display of the material being video projected), and since we’re running HDMI between the mixer cart (that holds the Kramer) and the video cart, we might as well use that same cable to carry digitally the stereo audio that will go out on the live stream.

Kramer out 1 goes into an OREI UHDS-102 (18G) HDMI splitter. Output 1 of that goes to the “wall” projector; Output 2 goes to a Sescom SESAI1001 Audio Inserter, which inserts the analog stereo sound mix from the Zoom H6 as the audio to accompany the video signal on the HDMI cable. But this HDMI signal is somehow incompatible with the Atem (perhaps in terms of resolution or color space), so we use an OREI HDS-102 (less than 18G) splitter, not for HDMI splitting (with only one output plugged in), but as a converter that somehow makes the HDMI signal palatable to the Atem.

Kramer out 2 is the same but without the audio inserter: It goes into another UHDS-102 (18G) HDMI splitter, whose first output goes to the “window” projector and whose second output goes to another OREI HDS-102 (less than 18G) used as an Atem-compatibility converter and not for splitting.

Linux Machine

A CCRMA Linux Workstation cmn35.stanford.edu is accessible from its own rolling desk.

XXX Which MOTU?

Beware that Linux doesn’t always successfully talk to the MOTU the first time you try so you might need to “play” or “start audio” a few times.

Also beware that by default the operating system will often perform an automatic 7.1 surround mix that you probably don’t want.

The best way for Linux software to access multiple audio channels is JACK, avoiding these and other problems. (JACK may not start the first time, but after it does start, all other software going through JACK can connect reliably to the MOTU.)

Linux video can’t go to projectors.

Piano

The Stage has a disklavier player piano.

HOWTO Play Video

1. Turn on the appropriate projector(s)

   1. Remotes are in the cookie jar on the desk with the mixing board

   2. [TODO add photo of projector remotes]

2. Plug laptop into HDMI input

   1. There are 5 inputs:

      • HDMI 5 is in R2D2

1. [TODO add photo of hdmi input cable + hook mount]

1. Select the video input for the projector you want to use

   1. [TODO add photo of projector selection matrix]

HOWTO Play Audio

1. Plug aux into the DI box [TODO add photo of DI box]

2. Move faders 1-2 up on the Yamaha mixer to desired level [TODO add photo of yamaha mixer]

You can route each channel 1-2 to any combination of speakers

OR

2 USB MOTUs on r2d2

This page of CCRMA documentation last committed on Mon Jan 9 12:34:29 2023 -0800 by Matthew James Wright.

This page was built with uncommitted changes on Thu Feb 2 17:01:52 PST 2023 by matt