RMAA test results
Several tests were performed, one with the M-Audio Firewire Audiophile mobile interface running in
loopback mode to establish the baseline (lowest limit of measurement resolution), and anothers with
the Mini³ amplifier added to the chain with 330&Omega or 33
Ω
dummy loads connected to the Mini³'s
output.
The Mini³'s volume control knob is set to maximum for these tests. This is worthy of mention because
many others test their amplifiers with the volume set lower, which would give artificially low noise and
distortion results.
Click on the following links to see the results.
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Comments on the RMAA test results
The measured performance with 300
Ω
load is excellent for both Mini³ editions, exhibiting extremely
low THD and IMD distortion, low noise floor and low stereo crosstalk through the entire audio
frequency range. There is virtually no degradation of performance on the high performance edition
when the load is decreased to 33
Ω
The extended runtime edition shows increased THD and IMD with
33
Ω
load (due to its lesser output current capability), but these results are still very good compared to
many other amplifiers, particularly those of similar size to the Mini³.
The stereo crosstalk in the high frequency range for both editions was not impacted as the load is
decreased from 330
Ω
to 33
Ω
illustrating the benefit of the 3-channel active ground topology. See the
The slight rolloff at the low end in the frequency response graph is due to the M-Audio's coupling
