McIntosh AA2 Service Manual

Page 2

AA2

PERFORMANCE LIMITS

METER CIRCUIT .

Frequency Range: 20 Hz to 20 kHz, response t 0.5 dB
Waveform Response: Average responding calibrated in RMS volts and dB SPL
Averaging Time; Selectable, fast and slow (5 sec. and 30 sec.)
Signal Range: SPL, 60 dB to IOO dB at mid scale volts, lmV to lOOm volts AC full scale
Meter Scales: volts calibrated from .0] to l. SPL, calibrated from -20 dB to + 20 dB
Crest Factor: Greater than A at full scale.
Input Impedance: 50k ohms and less than SOpF
Meter Output Level And Impedance: l volt output at full scale meter reading
Source impedance 300 ohms

Load impedance not less than IOk ohms

ONE THIRD OCTAVE FILTER

PINK

Frequency Range: 20 Hz to 20 kHz in 3l ranges with ISO recommended band frequencies (20, 25, 31.5,
40, SO, 3. BO, 100, l25, I60, 200 and multiples of IO and I00 thereof)

Selectivity: l/3 octave bandwidth (29% wide). Two filter sections are used each having a pole
butterworth filter characteristic. At .58 and l.8 times the center frequency, each section
is down Is dB (30 dB for both sections).

NOISE GENERATOR
Frequency Range: 20 Hz to 20 kHz with output 1 I dB per l/3 octave bandwidth .
Output Level: 0 to l volt RMS into l0 k ohms or higher. Output source impedance less than I k ohm.

Output is peak limited for all settings of the level control,
Crest Factor: About A

Source: Digital logic pseudo random noise generator

CM ZOI CONDENSER MICROPHONE

Response 20 - 20,000 Hz (see typical curves)

Sensitivity -65 dB re l volt per microbar at l kHz nominal
Noise equivalent A dB SPL unweighted

Cartridge diameter l3 mm (.46 inches)

Cablez~ Two conductor shielded. Length 10 meters (32.8 feet)
Stand adapter with 5/8 - 27 thread

POWER REQUIREMENTS

l20 volts, 50-60 Hz, 6 watts

MECHANICAL INFORMATION

Size: Length ll.75 (29.8 cm), width 8.75 (22.2 cm), height 9.5 (24.1 cm)
Weight: ILI pounds (6.35 kg) net, l6 pounds (7.26 kg) in shipping carton . 1

Finish: Black