capacitor. The Mini³'s actual frequency response is flat down to 0Hz. Likewise, the high-end rolloff in
the graph is due to the M-Audio's anti-aliasing filters. Both Mini³ editions have high frequency
response that extends to 10MHz and beyond.
These tests were run with the amplifier operating on battery power. The same results were obtained
when the amplifier ran on external power via an unregulated AC-DC adapter. In particular, no change
was observed in the noise floor, showing that the Mini³'s onboard voltage regulation is very effective.
Oscilloscope waveforms
The oscillogram waveforms of the Mini³ amplifier are shown below. All input waveforms are produced
by a Wavetek 188 4MHz sweep function generator.
The following are the 100KHz square wave rising edge response of the Mini³ high performance and
extended runtime editions, as tested witThe rise time as well as the peak-to-peak output amplitude is shown on the right hand side of the
display. As could be seen, the extended runtime edition's rise time (and thus slew rate) is actually
faster than the high performance edition.
Mini³ high performance edition
Mini³ extended runtime edition
Below are additional waveforms as measured with a Protek 6510 100MHz analog oscilloscope. In all
graphs except the Lissajous waveform, the top trace is the input and the bottom is the output. The
100KHz square wave graphs show no overshoot or ringing. The lissajous (X-Y) graph shows no
discernable phase shift.
