How to Install and Use DirectSelect™ Volume Control /Headphone Modules
This document provides installation and operational guidance for the Audio Authority DirectSelect™ 2958 Volume Control Module and the 2959 Headphone Distribution Module.
Product Overview
The Model 2958 introduces SilenTouch™ switch interval muting and volume control to DirectSelect™ Series switching systems. SilenTouch™ is Audio Authority's proprietary technology for eliminating switching noise and protecting relay contacts. Volume control is managed by a digital rotary encoder, preventing potentiometer noise and over-rotation damage. Optional up/down push-buttons can also control volume.
The Model 2959 is similar to the 2958 but includes eight stereo headphone outputs, making it suitable for headphone demonstrations with volume control.
Both modules can function as stand-alone volume controls in any audio system with RCA or 3.5mm signal jacks when powered by a 12-volt power pack (Audio Authority part number 805-021). For applications requiring advanced features like wider volume control range or adjustable limits, consider the Model 988CP0 or 988CP3.
Installation
Step 1: Mounting the Volume Control Knob
This step is optional if the volume control knob is not required. The volume control can be mounted on any panel surface up to 3/4 inch thick.
To prepare the panel: Use the provided template to determine the location for the volume knob. First, drill a 1/2" hole. Then, drill a 1-1/4" hole 5/8" to the right of the first hole.
Diagram Description: A diagram shows two circular holes for panel mounting. The first hole is labeled '1/2" hole'. The second hole is labeled '1-1/4" hole' and is positioned 5/8" to the right of the first hole.
Mount the volume control sub-board to the back of the panel using screws as specified in the table below. Install the spinner knob onto the volume control shaft using the provided hex key. Use two strips of paper to create clearance between the knob and the panel. Connect the volume control cable to the 6-pin header on the main board.
| Panel Thickness | Fastener | Drill | Notes |
|---|---|---|---|
| Up to 1/4 inch | 6-32 machine screw and nut | 5/32" | Reverse the two plastic spacers |
| 3/8 to 5/8 inch | #6 sheet metal or drywall screw | 7/64" | Use the plastic spacers as-shipped |
| 3/4 inch | #6 drywall screw | 7/64" | Remove the two plastic spacers |
Step 2: Mounting the Main Board
Mount the main board close to the rest of the system using the supplied screws.
Step 3: Connecting in Switching Systems
In switching systems, connect the source output bus to the RCA or stereo mini-phone Bus Input jacks. Connect the amplifier input bus to the 2958/2959 Bus Output jacks. Link the System Bus of each switching system product group to a distinct System Bus port on the 2958 or 2959. Examples of product groups include sources, amplifiers/receivers, and speakers.
Important: Do not cut any of the yellow interlock wires in the bus harnesses when using the 2958 or 2959. Refer to the DirectSelect™ instruction manual for detailed switching system application information.
Diagram Description: A block diagram illustrates signal flow in a stereo DirectSelect system. Sources connect to module 2952, then to the Volume 2958 module, which connects to Receivers (module 2957), and finally to Speakers (module 2953). A 'System Bus' interconnects these components. The diagram is labeled 'The location of a 2958 in the signal flow of a stereo DirectSelect™ switching system.'
Stand-alone System Installation
Step 4: Stand-alone Connections and Power
For stand-alone volume control systems using the 2958 or 2959, connect the audio source to the Bus Input jacks. Connect the input of an amplifier or powered speakers to the Bus Output jacks. Power the volume control module by plugging a 805-021 Power Pack into one of the System Bus ports.
Diagram Description: A diagram shows the 805-021 Power Pack connected to the 'SYSTEM BUS' port of a 2959 Volume Control/Headphone module. A 'Source (CD Player)' is connected to the 'BUS IN' port. Up to eight pairs of 'Headphones' can be connected to the 'HEADPHONES' jacks. A 'Sub-board' is also depicted.
Step 5: Headphone Connection (Model 2959 Only)
For the Model 2959, plug one to eight pairs of headphones into the designated headphone jacks.
Step 6: DIP Switch Configuration
Configure the DIP switches to activate various options according to the table below:
| Label | Setup |
|---|---|
| BUS | Turn ON to activate SilenTouch™ muting in DirectSelect™ switching systems. |
| TO | Turn ON to automatically return to nominal -20 dB default volume after a 2-minute timeout. |
| U/D | Turn ON to use up/down volume control buttons instead of the rotary encoder knob. |
| GND | Turn ON or OFF as needed to eliminate ground noise. |
Diagram Description: A diagram of DIP switches labeled BUS, TO, U/D, GND, with an indicator showing the 'ON' position. Another detail shows the 'TO' Dip Switch in the 'ON' position.
To use the up/down volume buttons instead of the rotary encoder, contact your Audio Authority Account Representative.
Operation
The 2958/59 volume control offers a volume range of approximately 30 dB. Volume is adjusted by turning the volume control knob or pressing the Up or Down buttons.
- TO Switch OFF: When power is applied, the volume control starts at full volume and remains at the last set level indefinitely.
- TO Switch ON: The volume control starts at a -20 dB timeout level. It also returns to this timeout level if the volume knob or buttons, and the DirectSelect™ switching system, have been inactive for two minutes.
