AMX NXC-VOL4 specifications Specifications, Pinouts, Signals, and Functions, I/O Jumpers CH1-CH4

Installation Guide

NXC-VOL4Volume Card, 4 Channels

NetLinx Control Cards and NetModules

NetLinx Control Cards can be installed in either the NXF CardFrame, NI-4000, or NetModules. This document provides basic specifications and wiring information for the NetLinx Control cards. For detailed information on the cards, refer to the NetLinx CardFrame, Control Cards, and NetModules Instruction Manual found on-line at www.amx.com.

NXC-VOL4 Volume Control Card

The NXC-VOL4 Volume Control Card provides four discrete volume control channels with LED feedback. The volume control channels can be programmed for mono or stereo operation, and balanced or unbalanced audio connections.

It supports programmable audio levels, audio mute, variable ramp speeds and preset levels. Use the on-board jumpers to set the gain/attenuation (Unity, Pro level (+4dBu) to Consumer level (-10dBu) conversion, or Consumer level to Pro

level on each channel).

I/O Jumpers (CH1-CH4)

FIG. 1 NXC-VOL4 Volume Control card

Specifications:

NXC-VOL4 Specifications

Power Requirements	197 mA @ 12 VDC
Volume 1-4	Four volume channels
Status 1-4	Yellow LED shows level-up/down activity.
(3 LEDs per channel)	Red LED shows mute mode:
	• LED 1: Channel	1	RAISE (yellow)
	• LED 2: Channel	1	LOWER (yellow)
	• LED 3: Channel	1	MUTE (red)
	• LED 4: Channel	2	RAISE (yellow)
	• LED 5: Channel	2	LOWER (yellow)
	• LED 6: Channel	2	MUTE (red)
	• LED 7: Channel	3	RAISE (yellow)
	• LED 8: Channel	3	LOWER (yellow)
	• LED 9: Channel	3	MUTE (red)
	• LED 10: Channel 4 RAISE (yellow)
	• LED 11: Channel 4 LOWER (yellow)
	• LED 12: Channel 4 MUTE (red)
Gain jumpers 1-4	• Unity
	Maximum Input Level: +10dBm
	• Pro level to Consumer level conversion
	(attenuation of +4dBu IN to -10dBu OUT)
	Maximum Input Level: +10dBm
	• Consumer level to Pro level conversion
	(gain of -10dBu IN to +4dBu OUT)
	Maximum Input Level: +6dBm
Connections/wiring	Two 10-pin 3.5 mm captive-screw terminals
Audio Specifications	• Frequency response of 15 Hz - 25 KHz
	• THD less than.005% at nominal output level
	• S/N ratio greater than 100 dB (IHF A)
	• Crosstalk less than 80 dB
	• Logarithmic attenuation range of 95 dB
Models	• NXC-VOL4 Volume Card
	• NXM-VOL4 Volume NetModule

Pinouts, Signals, and Functions:

NXC-VOL4 Pinouts, Signals, and Functions

Pin	Signal	Balanced Function	Unbalanced Function
		Channel 1
1	GND	Audio GND	Audio GND
2	Input 1+	Audio IN	Audio IN	(jumper)
3	Input 1-	Audio IN	Audio GND
4	Output 1+	Audio OUT	Audio OUT
5	Output 1-	Audio OUT	no connection
		Channel 2
6	GND	Audio GND	Audio GND
7	Input 2+	Audio IN	Audio IN	(jumper)
8	Input 2-	Audio IN	Audio GND
9	Output 2+	Audio OUT	Audio OUT
10	Output 2-	Audio OUT	no connection
		Channel 3
11	GND	Audio GND	Audio GND
12	Input 3+	Audio IN	Audio IN	(jumper)
13	Input 3-	Audio IN	Audio GND
14	Output 3+	Audio OUT	Audio OUT
15	Output 3-	Audio OUT	no connection
		Channel 4
16	GND	Audio GND	Audio GND
17	Input 4+	Audio IN	Audio IN	(jumper)
18	Input 4-	Audio IN	Audio GND
19	Output 4+	Audio OUT	Audio OUT
20	Output 4-	Audio OUT	no connection

NXC-VOL4 Connections/Wiring:

The NXC-VOL4 card contains four audio volume control channels. Each line- level channel is isolated from system ground and can be configured for balanced or unbalanced line operation. It supports programmable audio levels, audio mute, variable ramp speeds, and preset levels. Each audio channel's input to

output gain ratio is adjustable via the on-board jumpers shown below.

Unity (jumper not installed)

Gain (-10 dB Input level/+4 dB Output level setting on pins 1 and 2)

Attenuate (+4 dB Input level/-10 dB Output level setting on pins 2 and 3)

FIG. 2 NXC-VOL4 Volume Control card