Saturday, July 9, 2016
Holton Audio Ex Nihilo mono amplifier
The Ex Nihilo mono block class AB power amplifier is the result of more than 20 years of uninterrupted research conducted by Anthony E. Holton and Holton Audio in the field of high fidelity audio electronics. As the first member of a new product line integrating the most recent technological advances, Ex Nihilo was conceived from an idea to produce a no compromise power amplifier that could drive any HiFi loudspeaker in the known world. In order to achieve this, the Ex Nihilo power amplifier will drive 2 ohm loads with ease and do this at a continuous power outpu
The audio engine printed circuit board is a true mono block fully balanced topology construction with the entire power supply, protection and audio amplifier circuitry built into a 2mm 2 ounce copper gold plate board. The high current power supply feeding the output stage has two high current SMD bridge rectifiers feeding two banks of 48 low ESR filter capacitors for a total filtering capacitance of 225,000 μF. The input driver stage also has its own electronically regulated power supply. This provides extreme electrical isolation from the high current output stage pulses. The two electronic regulators feeding the input driver stages have their own dedicated and isolated secondary winding and bridge rectifier filter bank, providing a well-regulated and isolated power supply for the best possible sound quality.
The main audio amplifier uses 12 x 250 Watt dual die lateral MOSFETs in each output stage to transfer the enormous DC reservoir to the loudspeaker load. The Ex Nihilo is a true DC direct coupled power amplifier with no audio capacitor anywhere in the signal path including the feedback network.
In addition to this the Ex Nihilo power amplifier uses a DC Servo in its feedback network to correct DC offset to practically zero volts. Protection for the amplifier is managed by a smart power controller in conjunction with a 120 amp solid state relay on the output of the power amplifier for seamless protection and noiseless power up and power down modes.
The mono block cases are exclusively built out of 10 mm aerospace grade aluminium alloy panels. The unique anti vibration designed case harbor's a 2.5 kVA fully shielded encapsulated toroidal transformer, placed on its own patented double isolated mezzanine system. Together with a third isolation level, this system cancels out any acoustic noise. The two 400 mm heat sinks insure an optimal heat transfer and allow driving the amplifier at low temperatures at any power.
Each mono block amplifier is supplied with its own pro audio road case.
275 W RMS into 8 Ohm
525 W RMS into 4 Ohm
900 W RMS into 2 Ohm
1.5 Hz to 200 kHz -3 dB
SIGNAL TO NOISE RATIO
-110 dB Unweighted
26.8 dB Unbalanced Input
32.8 dB Balanced Input
Single-ended Input: 20 kOhm
Balanced Input: 40 kOhm
2.0 V RMS
100 Hz 8 Ohm = 1300
POWER SUPPLY TRANSFORMER
2.5 kVA Custom designed encapsulated fully shielded
225,000 μF total filtering
ETI Research, Neutrik, Schaffner and ESO
W 355mm x H 220mm x D 420mm
35 kg approx. per mono block