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The MIA-1.0 Musical Instrument Adaptor (traditionally called a Direct
Box) was initially designed to compliment the MA-2.2
Microphone Amplifier, converting unbalanced instrument inputs into
a balanced mic level signals. This is achieved with a simple FET input,
balanced output Buffer amplifier. There are no transformers in the audio
path, ground isolation is achieved by the use of a transformer in the
hi-frequency power supply that converts the phantom power to the nominal
12V operating voltage. Very nifty !!
Front View
The MIA-1.0 can of course be used
with any mic preamp equipped with +48V phantom power (8mA). Users can
expect smoother bass performance and excellent treble reproduction without
the phase shift anomalies inherent in standard transformer coupled designs.
Rear View
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Zero feedback
Class A buffer amplifier, no audio transformer.
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Real rubber feet
- not self adhesives that drop off after a week !!
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Three auto selecting
inputs optimized for different levels...
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AMP IN
is for the connection of speaker level signals, eg, the main
output of a bass amplifier.
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LO-Z IN
is for the connection of a line level device such as a keyboard
or sampler or CD player output.
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HI-Z IN
is for the connection of high impedance pickups, eg, bass
guitar or acoustic pickups.
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Three useful
outputs...
- HI-Z OUT
This is a loop output of all 3 inputs. The AMP IN signal is
available on this jack at -35dB. The LO-Z IN signal is -6dB. This
is very handy for "re-amping", ie, taking the speaker
out of a amp and feeding it into another amplifier.
- BUFFER OUT
Provides a buffered unbalanced version of the HI-Z OUT.
- BAL OUT
The main output to the mic preamp and power source (+48V phantom).
Ground lift to isolate input/output earths. TOP
Measured when powered/amplified
by a Buzz Audio MA-2.2 Class A Mic Preamp set
to +20dB gain.
Gain = HI-Z in +6dB, LO-Z in 0dB, AMP
in -35dB.
Maximum Recommended Output Level = 0dBu (0.3% THD).
Frequency Response = 6Hz to 250kHz, +0/-3dB.
Harmonic Distortion = Typically less than 0.07% -100Hz
to 10kHz @-20dBu input level.
Signal to Noise Ratio = -83dBu, 10k source Z, A wtg.
Input Impedance = HI-Z in 1Meg ohms, LO-Z in 20k ohms,
AMP in 27k ohms.
Output Impedance = BUFFER out 2k ohms, BAL out 150
ohms.
Controls = Ground lift.
Indicators = +48V Phantom Power LED.
Connectors = Inputs - TRS 1/4" jacks. BAL out - XLR3F
pin 2 hot.
Size = 145Wx44Hx126D.
Power requirements = +48V phantom @ 8mA current consumption.
Specifications are typical of a production
unit and are subject to change without notice.
0dBu reference = 0.775 volts RMS.
TOP
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