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Description:

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The AT-MX351 automatic mixer is ideal for meetings, seminars, teleconferencing, worship services, courtroom proceedings, radio and TV broadcasting and A/V applications. All switching is under microprocessor control with proprietary algorithms for instant, seamless operation. An individual priority pre-select switch for each mic/line channel allows choice of one-channel-at-a-time operation, all active, or any mix of moderator override. The last microphone on stays on so that ambient sound is never muted. Plus, any number of SmartMixers can be linked to create a system for large multi-mic installations. The priority control system extends throughout the entire chain.

- Four automatic Mic/Line inputs, plus Aux in
- Automatic threshold setting
- 48V phantom power individually selectable for each channel
- Limiters on each mic channel prevent individual channel overload
- Balanced inputs and output, selectable Mic/Line-level
- Individual gain controls for each channel
- Switchable manual mode overrides automatic functions
- Master output level control
- Pre- or post-controller audio outputs from Mic/Line channels
- Off attenuation for each input adjustable to -40 dB
- Sub-D connector for TTL output, plus closure-control input for external control of each channel
- NOMA operation provided, can be turned on/off
- Output level meter with Peak and RMS modes
- Monitor headphone output with adjustable level
- Internal AC supply
- Mounts in a single 19 in rack space
- Includes rack mount adapters

SPECIFICATIONS
Input Impedance	Mic: 8,000 ohms Line: 50,000 ohms Aux: 50,000 ohms Link In: 20,000 ohms
Output Impedance	Balanced Line: 200 ohms Mic: 300 ohms Unbalanced: 400 ohms Link Out: 100 ohms Preamp Out: 750 ohms
Maximum Input Level	Mic: -24 dBV Line: +27 dBV Aux: +17 dBV
Maximum Output Level	+22 dBm
Nominal Output Level	(0 VU) Balanced Line: +4 dBm (600 ohms), +4.4 dBV (open circuit) Mic: -46 dBm (600 ohms), -44 dBV (open circuit) Unbalanced: -10 dBV (open circuit) Preamp Out: -10 dBV (open circuit)
Maximum Monitor Output	700 mW, 20 ohm load
Maximum Gain	73 dB
Frequency Response	40 Hz to 22 kHz
Equivalent Input Noise	-128 dBV (150 ohms) at maximum gain
Input Attenuation	10 dB
Mic/Line Input Pads	50 dB
Maximum NOMA Attenuation	approximately 20 dB (up to 100 microphones on simultaneously)
Microphone Phantom Power	+48V DC
Control Voltage Out	+4V DC
Power Supply	120V/230V AC (switchable), 50/60 Hz, 10W
Operating Temperature	32 degrees to 104 degrees F (0 degrees to 40 degrees C)
Dimensions	16.93 in (430 mm) W x 9.38 in (238 mm) D x 1.75 in (44 mm) H (including feet, knobs and connectors)
Weight	6 lbs. 13 oz (3.1 kg)
Accessories Included	AC power cable; AT8325/1.0 Link Cable; rack mount adapters; security caps