PREference pre-amplifier
(Hi End pre-amplifier by isolated power system design)
Characteristic
PREference, the second-generation preamplifier from KingRex, is a logical extension of the success story of the award-winning Preamp. Centered around high-quality op-amp and the diamond buffer highly praised for its musicality, a current booster has been added to the final output of the amplifier stage to enhance drivability. DC servo circuit has also been implemented to avoid unwanted audio signal loss due to coupling capacitors. Volume control is ALPS. Gain is user selectable with a choice of 7, 14, or 20dB. The result is accurate and perfect signal amplification, free from colouration and yet highly adaptable, the ideal for outputting to power amplifiers.
A separate high-performance power supply unit further guarantees an interference-free working condition. Panasonic FM electrolytic capacitors stand on guard along critical paths with their dedication to extremely low ESR. Both the preamp and the PSU are housed in all-aluminum chassis. A special feature is the sliding door on top of the preamp opening up to phonostage settings: MC/MM with high/low gain and 6 pre-resistive loads.
Boasting impressive full frequency range with THD as low as 0.0005% and Signal to noise Ratio is 126dB, the PREference will be the chosen one for discerning audiophiles.
Technical Specifications:
| Inputs: |
RCA*4 |
| Outputs: |
RCA*1 |
| Gain: |
7dB,14dB,20dB Selectable |
| Frequency Response Range: |
20Hz-20Khz(+0~-0.1dB)
5Hz-80Khz(+0~-1.0dB) |
| Maxium Input Level: |
9Vrms(@0dB) |
| Maxium Output Level: |
9Vrms |
| THD+Noise: |
<0.0005% @1KHz
<0.0002% @20KHz |
| Input Sensitivity: |
1.1V For 2.5V Out@7dB Gain
510mV For 2.5V Out@14dB Gain
250mV For 2.5V Out@20dB Gain |
| Signal to Noise Ratio: |
126dB |
| Channel Separation: |
112dB@1KHz,92dB@10KHz |
| Power Consumption: |
<10W |
AP test result: KingRex PREference @14dB Gain PDF
Phonostage Specifications
Signal to Noise Ratio: 112dB(MM-Low gain), 104dB (MC-Low gain)
THD+N Ratio = 0.0006%(MM-LOW Gain) 0.001%(MC-LOW Gain)
Crosstalk (at 1kHZ): -94dB (MM-Low gain), -79 dB(MC-Low gain)
Crosstalk (at 10kHz):-100dB (MM-Low gain), -86dB(MC-Low gain)
Gain (at 1kHz): 24dB(MM-Low gain), 43 dB(MC-Low gain), High gain=+20dB
Max Input Level: 19mV(MM), 6.6 mV(MC), (High-gain)
218mV(MM),72mV (MC),(Low-gain)
Output Impedance: <100 Ohms
Input Impedance : 100Ohms, 220 Ohms, 47kOhms, switchable
Input Capacitance: 0 P, 100P, switchable.
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