The Buzz Audio 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 !!

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.

Zero feedback Class A buffer amplifier, no audio transformer.

Real rubber feet - not self adhesives that drop off after a week !!

Three auto selecting inputs optimized for different levels...

- AMP IN is for the connection of speaker level signals, eg, the main output of a bass amplifier.
- LO-Z IN is for the connection of a line level device such as a keyboard or sampler or CD player output.
- HI-Z IN is for the connection of high impedance pickups, eg, bass guitar or acoustic pickups.

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

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.