The amplifier board is a Mola Mola specific design. The audio circuitry is trimmed to the bare bones and board-to-board connectors are eliminated in favour of soldering star-quad cables directly into the circuit board for the cleanest, lowest impedance connection possible. The input stage is implemented on a separate circuit board that uses the same discrete buffers as those found in the Makua. The output filter sports monolithic capacitors whose dielectric stability is reflected in an impressively neutral and poised rendition. The days of compromising power efficiency for audio performance are finally over: the Kaluga delivers definitive audio performance with power efficiency thrown in as a bonus.
The two supposedly unassailable strongholds of class-A amplifiers are linearity and output impedance, at high frequencies. Plotted below are the output impedance as a function of frequency and the output spectrum in a high power (400W), high frequency IMD test. In both cases Kaluga outperforms any power amplifier, regardless of technology, operating class or asking price, of which such test results are available.
400W/8 ohm, 700W/4 ohm, 1200W/2 ohm
Unweighted Signal/Noise Ratio: 128dB
Distortion (THD, IMD): <0.003 % (all frequencies and power levels)
Input Impedance: 100kohm
Output Impedance: <0.003 ohm (DF>4000), all frequencies
Balanced and unbalanced input, selectable by switch
2 pairs of Furutech binding posts. Biwired directly to the amplifier PCB using Kubala·Sosna cable.
Trigger input (3.5mm jack)
DIMENSIONS AND WEIGHT
200mm (W) x 110mm (H) x 335mm (D). Depth includes speaker terminals.