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PowerDAC-S
PAGE 1
DAC type
2 x 44 bit Fractal-31 discrete, switch & resistor-based multibit power converters
Digital input
1 x Toslink 16/24 bit: 44.1 kHz / 48 kHz / 88.2 kHz / 96 kHz / 176.4 kHz / 192 kHz
Power Supply
Built-in 120 Watt 16V linear power-supply, 230VAC (default) or 115VAC (option)
Power
Temperature rise 0.263 ºC / Watt dissipated
E
ffi
ciency
6.77%
Output impedance
Remains 2.12 Ohms regardless of volume setting
Recommended
Speaker SPL
>= 90dB 1Watt at 1 meter distance
Load impedance
The PowerDAC-S can drive -any- load from dead short to infinity and speaker dips &
peaks are no problem either.
Steering method
The steering method is di
ff
erent from conventional audio systems, the PowerDAC-S o
ff
ers
quasi constant power steering and it combines the best properties of constant voltage
steering (semiconductor amps) and quasi constant current steering (tube amps). The
steering method is based on power division. Constant amount of power is divided between
PowerDAC and speaker, the louder the signal, the more idle power is diverted to the
speaker, at digital silence the PowerDAC gets all power and the speaker gets no power.
The amount of power drawn from the mains remains constant, regardless of the output
signal. One -could- compare this with a pure class-A amplifier where the entire output
signal is generated from the bias current.
Speaker drive
arrangement
Wheatstone Bridge (power supply noise cancelling circuit). One branch is provided by the
D/A converter, the other is provided by a split impedance for balancing the bridge.
Because of this supply noise cancelling method, the PowerDAC-S o
ff
ers a ghostly silent
background, this is essential for hearing the smallest details.
Bandwidth
Theoretically 100 MHz (based on switching speed), but practically limited by wiring and
other factors. Unlike amplifiers there is no band limiting present as there are no feedback
loops & phase margin issues. This unique property translates to zero phase errors within
the audio and ultrasonic spectrum and zero degrading related to feedback loops, thermal
memory and other typical degrading related to analogue circuits.
Distortion
< 0.0005% (0dB) at the speaker terminals. Noise floor typically below -140dB at the
speaker terminals (degraded by speaker wiring and speaker internal wiring and crossover
parts picking up noise).
Technical specifications
