MARQUETTE AUDIO LABS

* Since 1994 *

Buzz Audio Microphone Amplifier


The MA-2.2 has been designed by active recording engineers to provide the cleanest possible interface between microphones and recording channels. By utilizing Buzz Audio's own True Class A amplifier modules (the BE40), attention to power supply design and a resistor loaded C-Coupled input topology, this preamplifier exhibits sonic qualities unique in it's class.

The MA-2.2's ultra low noise and noise spectra provides the best possible dynamic range for digital recordings. The high speed and wide frequency response ensures distortionless reproduction of transients and excellent high frequency phase response - even at high gain. Users can expect a clean, uncluttered midrange coupled with superb treble clarity and extended tight bass response.

The MA-2.2 is a development of the original MA-2 first produced in 1993, with the circuit remaining essentially unchanged. Nothing is overlooked in the design of this piece.

- Fully discrete hi-bias wide bandwidth differential Class A amplifiers.
- Matched and selected semiconductors.
- Transformerless input hi-grade film coupling capacitors.
- 2 stages of power supply regulation.
- Individual discrete regulators for each stage of the 2 stage amplifier.
- High quality bifurcated relays for signal switching.
- No "DC servo" that mess with the bass.
- Single Point Ground pcb layout.
- 41 position max trimmed GAIN control.
- Trimmed common mode noise rejection.
- Optimized "grunty" Class A amplifiers for the input/output functions.
- Output Mute and Hi/Lo input impedance switches.
- Sowter output transformer option.
- 2 output connectors
- Shielded toroidal power transformer


Minimum Gain: +16dB (-4dB with pad in)
Maximum Gain: +65dB
Maximum Output Level: +24dBu unbalanced
Frequency Response: 2Hz to 250kHz @ 20dB gain (-3dB)
20Hz to 250kHz @ 65dB gain (-3dB)
Harmonic Distortion: Less than 0.008%100Hz to 10kHz
Slew Rate: typically 140 V/uS, @ +20dBu output level
EIN: -133.5dB A wtg, 150ohm source Z
Signal to Noise Ratio: -74dB A wtg, input shorted
CMNR: 100Hz-80dB, 1kHz -80dB, 10kHz-70dB internal trims
Channel to Channel Crosstalk: below noise
Input Impedance: 3k ohms/1k2 ohms switchable
Controls: Gain, Mute, Input Impedance, 20dB input Pad, Phase Reverse, Phantom pwr
Indicators: Peak Level @ +18dBu, Power On
Connectors: In-XLR3F, Out on 1/4" jack and XLR3M
Size: 1 Unit rack mount, (482Wx44Hx300D)
Power requirements: 230V/115V selectable


Specifications are typical of a production unit and are subject to change without notice.
0dBu reference = 0.775 volts RMS


Please call Dave at (510) 581-3817 for your price.