Pre Stereo, ideal combination with Xindak XA8800MN, Remote Control -- The Xindak XA8250MKII is the natural evolution of the well-known XA8250 model. Also in this case, it is a pure Class A preamplifier, characterized by a design in a dual mono structure, perfectly symmetrical.
It is the perfect complement to the Xindak XA8800MNu and Xindak XA8800MNE mono power amplifiers.
The input stage uses Toshiba Hi-Fi A970/C2240 transistors for the symmetrical two-channel parallel circuit. The emitter of each transistor is connected in series with a resistor, and acts as a feedback loop, to reduce distortion and increase linear dynamic range.
The current amplifier stage also uses a complementary push-pull amplifier circuit with A970/C2240 transistors. Thus, after being amplified, the signal is transferred directly to the output stage, maintaining the original purity unaltered.
The output stage adopts a pure Class A output scheme based on N-type and P-type JFETs, so as to increase the dynamic range and reduce the output impedance to a very low level.
This solution ensures the best possible integration between the preamplifier and the power amplifiers, for a perfect matching.
The left channel, right channel, and power circuit components are specially designed to be separated and isolated from each other.
The power supply consists of three distinct and separate independent power supplies: two power supplies, each for one channel, and a further power supply for the control circuit.
This arrangement eliminates electromagnetic interference and optimizes channel separation (and consequently reduces crosstalk or crosstalking phenomena).
The power filter uses military-spec electrolytic capacitors.
In addition, there are balanced XLR and unbalanced RCA inputs/outputs, with separate channels, equipped with protection and automatic muting functions.
The XA8250MKII is a JFET Class A pre-amplifier: the sound is natural, transparent and very analytical.
Extremely balanced in the entire frequency range: refined on the high frequencies, bright on the mids, full on the low frequencies.
◾Dual-Mono circuitry with separate channels; ◾Three separate power supplies: one for the left channel, one for the right channel, one for the control section ◾Complementary Symmetrical Amplification in pure Class A; ◾JFET (Junction Field Effect Transistor) circuitry; ◾Balanced inputs and XLR balanced output terminals with relay switching; ◾Unbalanced inputs and RCA unbalanced output terminals with relay switching; ◾Military specification motherboard, 2mm thick; ◾Great analytical ability, natural and transparent sound; ◾Motorized volume with analog ALPS Blue potentiometer (but driven by digital control, see below); ◾Patented technology for precise control of the volume level, through microprocessor ◾Remote control
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Gain: 17dB Output level: 10V RMS THD: 0.03% Frequency Response: 10Hz—100KHz (±1dB) SNR: >95dB (A Weight) Input Impedance: 15K Ohm Absorption: 7 Watts Weight: 10.5Kg Dimensions: 305mm x 200mm x 435mm
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