Aphex Systems 120A

Aphex Systems 120A

The Model 120 is a high performance audio distribution amplifier with a single high impedance input and four low impedance outputs, all electronically servo-balanced. The 120's transformerless circuits are designed for wide, flat frequency response free from ringing or overshoot, making it ideal for distribution of SMPTE time code as well as audio. Each output has its own amplifier and level control for maximum versatility and isolation. The sturdy steel chassis may be used stand-alone or rackmounted, singly or in pairs.

Features

• Servo-Balanced input and outputs
• Individual output level controls
• Wide bandwidth and dynamic range
• Compact 1/2 rack steel package
• Cost Effective
• Sonically transparent
• +25dBm output level into 600 Ohms
• Short-circuit proof
• Fully RF protected
• Recessed output level controls

Applications

• Radio and TV broadcasting
• Press feeds
• Sound Reinforcement
• Dubbing facilities
• Tape duplication facilities
• Recording studios
• Telephone line driver
• Mobile Radio and TV units
• Post production facilities

PERFORMANCE

The 120 was designed to be as transparent as possible. This means wide, flat frequency response, excellent transient reproduction and a dynamic range surpassing digital. This allows the 120 to be used in the most critical applications, as well as distributing SMPTE time code if necessary. Compact, rugged package provides maximum shielding and is equally at home on the ground in a location shoot or mounted in a studio's rack.

INPUT

The input circuit is a true instrumentation type, adjusted for good common-mode rejection. Servo-balancing compensates for high common-mode voltages, so headroom isn't sacrificed. The high input impedance allows bridging of the input signal with minimum loading. This way several amplifiers can be easily driven from the source. The input circuit is fully RF protected.

OUTPUTS

The individual output amplifiers are very low impedance so long lines and capacitive loads are easily driven with no loss of stability or high frequency response. Servo-balancing permits the outputs to be used single-ended at any time without a change in gain by simply grounding the unused pin. Individual output level controls are recessed for bump-proof operation, yet can be easily adjusted without tools. Each output is RF protected and fully short-circuit proof with a front panel clip indicator.

APPLICATIONS

The 120 will find use in a wide variety of applications, including TV and radio broadcast, production and post production, recording studios, tape duplication and dubbing stages anywhere a high quality, reliable signal distribution system is required.

SPECIFICATIONS - Aphex Model 120A Servo-Balanced Distribution Amp

Audio

• Frequency Response 5Hz - 100 kHz (+0, -0.5dB)
• Dynamic Range 94 dB
• Hum and Noise Better than -90 dBm at unity gain
• THD 0.002% @ +4dBm, 0.005% @ +20dBm
• IMD 0.002% @ +10dBm
• Channel Isolation > 70dB
• Slew Rate 13 V/usec

Input

• Connector XLR 3-pin Female
• Type Transformerless, differential servo balanced
• Impedance 100k ohms balanced
• Maximum Level +25 dBm
• CMRR (typical) > 45 dB

Output

• Connector XLR 3-pin Male
• Impedance 65 ohms
• Maximum Level +25dBm into 600 ohms balanced, +21dBm unbalanced
• Output Gain Range ±15 dB

Other Specifications

• Power Requirements 100, 120, 220, OR 240 VAC, 50-60Hz (specify voltage)
• Dimensions 1.75"H x 8.25"W x 7.25" D (44.5mm x 209.5mm x 184.2mm)
• Net Weight 3.5 lbs (1.6 kg)