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1)Current Mode Amplification
(Global PCT No.: PCT/CN2014/075775)
Questyle Audio’s Current Mode Audio Amplification features the use of transistors
to amplify, with a disaggregate structure designed in, to wit: voltage input and
output, while the core amplification takes place in the current domain operating in
a pure class A state, and allowing the output stage (OPT) to be changed to either
class A or AB. It is completely different from the traditional voltage mode amplifier,
in the structure of the amplification circuit. Capacitance between the transistors,
which affect the speed and bandwidth, operates at a very low impedance, and the
full-power bandwidth of the entire amplifier loop is very close to the bandwidth of a
closed loop, while the Slew Rate grows linearly with the input signals, together with
a strong and speedy negative feedback loop (the speed of the circuit is hundreds
of times faster than that of conventional voltage amplifiers). All these attributes are
quite different from that of a traditional voltage amplifier. It not only eliminates the
TIMD, it also easily achieves amplification with a wide bandwidth and ultra low
distortion.
2)Rigorous Test and Sound Control
During the development stage, we first use AP (Audio Precision) to analyze signal
data for objective test. Once the desired performance specs are achieved, exten-
sive listening tests are undergone to determine the sonic qualities that the objective
tests can’t measure. Subjective tests go hand in hand with objective tests, aiming
to achieve a perfect feeling as well as unbeatable specifications. Each CMA800P
will be tested by over 30 factors of specification before being shipped out, and copy
of the test report will be put into carton box, while another copy will be kept as a
record.
Technology
1) HIGH/LOW GAIN switch of CMA800P
Open the top cover of CMA800P, put the 4 switch buttons on the PCB to LOW for
LOW GAIN, and switch them to HIGH for HIGH GAIN.
2) LOW GAIN is recommended for matching with STAX SR-009.
When STAX SRM-727 is used as a power amplifier, it is necessary to open its top
cover and switch to “DIRECT” mode, bypassing the volume control for STAX
SRM-727.
Instructions
