AMX Stereo Receiver NXC VOL4 User Manual

Installation Guide  
NXC-VOL4 Volume Card, 4 Channels  
Pinouts, Signals, and Functions:  
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  
NXC-VOL4 Pinouts, Signals, and Functions  
Pin  
Signal  
Balanced Function  
Unbalanced Function  
Channel 1  
1
2
3
4
5
GND  
Audio GND  
Audio IN  
Audio GND  
Input 1+  
Input 1-  
Audio IN  
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.  
(jumper)  
Audio IN  
Audio GND  
Audio OUT  
no connection  
Output 1+ Audio OUT  
Output 1- Audio OUT  
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  
Channel 2  
6
7
8
9
GND  
Audio GND  
Audio IN  
Audio GND  
Audio IN  
level on each channel).  
Input 2+  
Input 2-  
(jumper)  
(jumper)  
(jumper)  
I/O Jumpers (CH1-CH4)  
Audio IN  
Audio GND  
Audio OUT  
no connection  
Output 2+ Audio OUT  
10 Output 2- Audio OUT  
Channel 3  
11 GND  
Audio GND  
Audio IN  
Audio GND  
Audio IN  
12 Input 3+  
13 Input 3-  
Audio IN  
Audio GND  
Audio OUT  
no connection  
14 Output 3+ Audio OUT  
15 Output 3- Audio OUT  
FIG. 1 NXC-VOL4 Volume Control card  
Channel 4  
Specifications:  
16 GND  
Audio GND  
Audio IN  
Audio GND  
Audio IN  
NXC-VOL4 Specifications  
17 Input 4+  
18 Input 4-  
Power Requirements 197 mA @ 12 VDC  
Audio IN  
Audio GND  
Audio OUT  
no connection  
Volume 1-4  
Four volume channels  
19 Output 4+ Audio OUT  
20 Output 4- Audio OUT  
Status 1-4  
(3 LEDs per channel)  
Yellow LED shows level-up/down activity.  
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)  
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 jumpers 1-4  
• Unity  
Gain (-10 dB Input level/+4 dB Output level setting  
on pins 1 and 2)  
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  
Attenuate (+4 dB Input level/-10 dB Output level setting  
on pins 2 and 3)  
Connections/wiring  
Two 10-pin 3.5 mm captive-screw terminals  
FIG. 2 NXC-VOL4 Volume Control card  
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  
 

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