The Audio-Technica system 9 is an agile wireless system with a four-channel frequency designed to give a solid presentation with simple setup and clear and natural sound quality. Presenting an elegant, stackable, and contemporary style, System 9 is available in manual mode, with headband, guitar, lavalier, and body-pack configurations. The system offers four user-compatible VHF channels that can be changed (169.505, 170.245, 171.045, and 171.905 MHz).

Each System 9 configuration includes the ATW-R900 receiver and a body-pack transmitter or a handheld microphone / transmitter. The ATW-R900 is a single-channel diversity receiver, with advanced dipole antenna design for an extended operating range, which improves the performance it provides is a terrestrial factor, in addition to the usual signal element. The ATW-R900 also offers volume control along with the AF Peak, RF and Power indicator lights.

• Easy to operate and clear and natural sound quality
• 4 frequently coordinated selectable VHF channels
• Balanced XLR and 1/4 "unbalanced output connectors allow use with a variety of audio equipment
• Reliable presentations and durable construction
• Dipole antenna system for extended operating range

OVERALL SYSTEM SPECIFICATIONS

Operating Frequencies: VHF highband, 169 MHz to 172 MHz 
Modulation Mode: FM 
Maximum Deviation: +/-10 kHz 
Dynamic Range: >/=90 dB (A-weighted), typical 
Total Harmonic Distortion: <1% (at 1 kHz, +/-10 kHz deviation) 
Operating Range: 200' (60 m) typical 
Open range environment with no interfering signals 
Operating Temperature Range: 40° F (4° C) to 110° F (43° C) 
Battery performance may be reduced at very low temperatures 
Frequency Response: 80 Hz to 13 kHz 
Maximum Simultaneous Use (Recommended): 200' minimum 

RECEIVER SPECIFICATIONS 
Receiving System: Non-diversity, single-channel, dual antenna system 
Image Rejection: 50 dB minimum 
RF Sensitivity: 20 dBuV at 60 dB S/N ratio (50 ohms termination) 
Audio Output: Nominal Output Level  
XLR, balanced: 350 mV (1 kHz modulation, 10 kHz deviation, 100k ohm load)  
1/4" (6.3 mm), unbalanced: 700 mV (1 kHz modulation, 10 kHz deviation, 100k ohm load) 
Power Supply: 100-240V AC (50/60 Hz) to 12V DC .5A (center positive) switched mode external power supply 
Operating Temperature Range: 40° F (4° C) to 110° F (43° C) 
Dimensions: 7.48" (190.0 mm) W x 1.82" (46.2 mm) H x 5.06" (128.5 mm) D 
Net Weight: 12.0 oz (337 grams) 
Accessory Included: Power supply 

BODY-PACK TRANSMITTER SPECIFICATIONS 
RF Power Output: 10 mW 
Spurious Emissions: Following federal and national regulations 
Input Connections: Four-pin Locking Connector  
Pin 1: GND  
Pin 2: INST INPUT  
Pin 3: MIC INPUT  
Pin 4: DC BIAS +9V 
Batteries: Two 1.5V AA  
not included 
Battery Life: 8 hours (alkaline)  
Depending on battery type and use pattern 
Dimensions: 2.76" (70.2 mm) W x 4.08" (103.7 mm) H x 0.98" (24.9 mm) D 
Net Weight: 2.8 oz (80.0 grams)  
without batteries

HANDHELD TRANSMITTER SPECIFICATIONS 
RF Power Output: 10 mW 
Spurious Emissions: Following federal and national regulations 
Batteries: Two 1.5V AA  
not included 
Battery Life: 8 hours (alkaline)  
Depending on battery type and use pattern 
Dimensions: 9.91" (251.8 mm) long,  
2.11" (53.5 mm) diameter 
Net Weight: 9.2 oz (260 grams)  
without batteries 
Accessory Included: AT8456a Quiet-Flex™ stand clamp