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CCRMA Seminar Room

The CCRMA Seminar Room (Knoll 315) is a small room with a large conference table, ideal for small classes and meetings or short projects requiring lots of surface area.

Contents

In this room you should see:

• Large conference table (which can be folded up: unlatch then lift the middle)

• Lots of chairs (both wheeled and the wooden ones from the Stage)

• One full wall of whiteboard surface, which is the sliding doors of the small storage closet.

• A retractible video projection screen (that can cover most of the whiteboard surface)

• A pair of Adam A5x loudspeakers mounted overhead at the corners of the projection screen

• An LG GRUS10N-GL video projector (s/n 208SHYDKC914) installed on the ceiling

• A rolling rack containing the audiovisual selection system

• “Cookie jar” of remote controls and video adapters

• A desk with a 4k video monitor, Tascam 2x2 audio interface, keyboard and mouse, connected through a KVM switch to any of these computers:

  1. CCRMA Linux Workstation cmn60
  2. Whichever computer is selected on the KVM switch on the “desktop” cart on the Stage, e.g., the Stage Mac Studio.
  3. Your laptop (if you plug in the HDMI and USB cables)

Audiovisual Selection

Use the Kramer system to plug in and choose one video source.

Use the mixer to mix the audio (including stereo from the selected HDMI source).

Audio System

We now hear the mix of a few audio sources via a K-Mix Blue digital mixer:

(Microphones)

The first two mixer channels are currently reserved for future microphone inputs, or live signals from the Stage.

HDMI

Whatever stereo audio the selected HDMI source may contain.

Linux

Stereo sound, in analog, from the Linux machine’s connected Tascam audio interface (affected by the Tascam’s LINE OUT 1-2 and MONITOR BALANCE volume knobs)

Analog

From the dangling stereo audio cable with a 1/8 inch (aka 3.5mm) TRS unbalanced analog stereo connector, meant to plug into the headphone jack of a laptop, phone, etc.).

Operating the K-Mix

We use only a fraction of the capabilities of the K-Mix; this diagram shows which parts of the user interface we do and don’t use in the Seminar Room:

Each of the mixer’s 9 faders is touch-sensitive; just rub your finger up and down to control volume.

Channel trims have been adjusted so that a computer’s 0 dB just barely doesn’t clip and is approximately identical in loudness when switching between HDMI and headphone jack (at least on one particular laptop).

The HDMI, Linux, and Analog inputs are “paired into stereo channels”; adjusting either (left or right) volume will always control both equally.

Each fader is also a 12-segment LED display. The VU button in the lower left corner toggles between the two modes of what these meters display:

• VU unlit (off): each meter shows how much the fader is turned up or down, the equivalent of looking at the position of a physical fader.

• VU lit (on): each meter shows the ever-changing current volume of the signal, like a VU meter.

We recommend VU on, because it lets you see visually which mixer channels correspond to the sound you’re currently hearing, so you know which faders will adjust the volume.

This page of CCRMA documentation last committed on Mon May 15 10:57:07 2023 -0700 by Matthew James Wright. Stanford has a page for Digital Accessibility.