when power is not available from the wall. The power supply must act as
a local reservoir of power from which the amplifier circuits draw. This
storage function is responsible for much of the bulk, weight and cost of
traditional power
amplifiers.
High Frequency Switch Mode Power Supplies
Stewart’s famous, High Frequency Switch Mode Power Supplies fully re-
charges 1000 times faster than conventional supplies, requiring far less
capacitance for filtering and storage. This high-speed recharging reduces
power supply “sagging” common with other designs.
The
New DA-70 Series Digital Amplifiers
utilizes a new, regulated,
forward converter design Switch Mode Power Supply operating at a fre-
quency 2/3 faster than our old standard supply.
Power Factor Correction
Models with a PFC designation utilizes Power Factor Correction circuitry in
their power supply. This circuitry automatically adjusts the power supply
to provide stable, full output over a wide range of mains voltages, typi-
cally from 90VAC to 240VAC. This feature makes the DA-70 Series oper-
able anywhere in the world, and is a very useful feature when
operating from unstable or questionable AC mains.
This power supply’s remarkable conversion efficiency combined with
Damped Ternary Modulation translates into major savings of energy
drawn from the AC line. The benefits are reduced heat dissipation, and
downsizing of most major components. This saves space and weight
without sacrificing the Sonic excellence Stewart Audio is famous for.
Bridging
Bridging of the DA-70 Series is not possible due to the high
efficiency design of the Damped Ternary Modulation.
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