Technical details of
the Magnetic Enigma-1.0R
The unique design of this all new tube preamp, the "Magnetic
Enigma-1.0R" can be implied from the term "magnetic",
which indicates its direct origin from the StereoKnight magnetic
passive preamp. Not only does the Enigma-1.0R use 4 transformers
for volume attenuation, but also another 2 transformers for signal
output, and two more for power supplies.
The remarkable performance of this Preamp has been achieved with
an all new audio and power supply circuit design. The circuit
is pure tube, Class-A, with zero feedback, utilising a total of
four long-life tubes (2 6H30 as the drivers and 2 6922 as the
amplifiers); and further, it is a true balance circuit design
in both the input and output stage, with the support of 4 volume
control transformers. For balanced input signal, each channel
has two opposite signals, a positive and a negative one. Theoretically,
it needs 4 transformers to attenuate 4 separate input signals
for a two channel source. StereoKnight had implemented this theory
into the design of the magnetic passive preamp, resulting in exceptional
performance.
The Magnetic Enigma-1.0R is a direct upgrade from StereoKnight's
reference version of the magnetic passive preamp. By utilising
both tube amplifiers and output transformers. One great advantage
of this magnetic feature, is its capability for optimal matching
with any amps and interconnects, while accepting any sources input
at various impedance levels.
In the interests of achieving the least possible interference
to the audio signal, the power supply is divided into two separate
parts: The main power transformer, which is used to power the
audio circuit, and a smaller power transformer, which is designed
to support the remote control, and LED display functions. MOSFETS
are used for both voltage stabilisation and supplying a constant
current, which enhances the reliability and makes the tube amplification
as linear as possible.
With its great build quality, audiophile grade components, versatility
and the ability to musically transform every system, the result
is, that not only does the Enigma-1.0R deliver striking clarity
and detail, that presents instrumental timbres and textures in
an amazingly lifelike way, and also represents great value and
reliability.
Feature summary of the Magnetic Enigma-1.0R line stage preamplifier.
* Fully differential circuit with
balanced in and out.
* 4 transformers for volume attenuation with 33 steps.
* Transformer output.
* Pure tube, Class-A, with a Zero feedback audio circuit.
* The Versatility to match all kinds of amplifiers and interconnects,
based on full magnetic
or transformer implement designs.
* The capable to drive two amplifiers or one amp + one subwoofer
at same time either
through the two balanced or RCA outputs.
* Full remote control on volume, source selection, output selection,
balance adjustment,
dimmer, etc.
* MOSFETS for voltage stabilisation, and supplying constant a
current.
* Hovland musicap capacitors in the signal path.
* Detachable IEC power cord. High quality gold-plated StereoKnight
custom binding posts and RCA jacks, TEFLON insulated wire and
Japanese made POCC rectangular solid core copper wire throughout.
* Full machined aluminium alloy chassis and remote control for
best possible build quality and appearance.
Specifications:
Tube complement: Two 6H30 as the drivers, two 6922 as the
amplifiers.
Frequency response: 8 Hz ~ 80 KHz , -1 ~ +1 dB.
Input Impedance: 20k ~ 300k ohms, a great feature favoured
by the Magnetic Enigma volume control function.
Volume control: 4 transformers at balance input, 2 transformers
at RCA input, used to attenuate, with 33 steps which are connected
to 33 digital relays. The relays are controlled by a CPU that
receives the signal from a digital stepper, which is either the
consequence of turning the volume knob or by instruction from
the remote control.
Output Impedance: 600 ohms balanced. The Enigma is of pure
balanced circuit design, so the 2 RCA output is converted from
the balanced output.
Gain: 20 dB
Output voltage: 20v RMS balanced at 2v RMS input at less
than 1% THD at 1kHz
S / N: > 100 dB at 1KHz
Input selections: 4 pairs RCA single-ended ; 3 pairs balanced
/ XLR
Output selections: 2 pairs balanced / XLR ; 2 pairs RCA
( two amplifiers or one amplifier and one subwoofer can be connected
same time, either by balanced output, or RCA output )
Remote control functions: Source select, output select,
volume up /down, mute, dimmer, balance adjust +/-
Power consumption: 45 watts
Dimensions: (W x D x H) 430 x 400 x 140mm or 17 x 15.5
x 5.5 inches
Weight: 48 lbs (22 Kg) net weight, 61 lbs (28 Kg) shipping
weight
Inside view showing the stunning build
quality and quality components.
