Aurorasound PREDA - fully balanced, dual-mono design, t...
The latest Aurorasound product is an outstanding and very innovative preamp. Its list of features is long like a 54-step transformer-coupled volume control, fully balanced, true dual-mono design, gain-selector, gold-plated circuit boards, rhodium-plated connectors, golden-age transistors (developed especially for audio), glass-encapsulated relays, and more. The sound is extremely detailed and transparent (without sounding thin), very clear and clean with super low noise floor, full-bodied with rich textures and very fast and dynamic. It was reviewed in the hi-finews Nov. 2014 and received the Editor's Choice AwardSteve Harris concluded: "...no ordinary preamp, to say the least, the Preda seems to reflect its designer's long experience in modern commercial electronics as well as his lifelong audiophile quest. It's somewhat idiosyncratic in styling and ergonomics and so it may not be for everyone. But sonically, it can be revelatory, excelling at portraying the realism of vocal textures, for example, which makes the music expressive. It must be heard!" Check out the entire reviewFEATURES:
A conventional resistor-type attenuator waste energy of reduced signal as heat. Since the current in a preamplifier is small, it does not give off high heat, however, attenuated signal is discharged in the air as heat. A transformer-type attenuator is an electric energy convertor without energy loss, therefore, it allows lossless signal level control. A typical transformer-type attenuator has only around 32 steps, but Aurorasound adopted 54 steps, which allows precise setting of volume level.
Highly-reliable Lead Relay used for tap selection
Highly-reliable lead relay encapsulated in small glass tubes are of UK-based Pickering Manufacture. ON/OFF switching is accomplished by an external magnetic field generated by current in the coil. Multiple lead relays are completely shielded by mu-metal to avoid interferences.
Newly Developed Aurora-AMP Module
Aurora-AMP Module is a discrete amplifier, capable of handling heavy load for high driving, up to 110dB open-loop gain. It has 12MHz gain-band width, THD+N of 0.0003%, through-rate of 28V/ usec, offering extremely high performance. The PCB is gold plated, without use of resist process to avoid any coloration on sound. PREDA uses 6 units of this AMP module. This unit has become the core amplifier module of Aurorasound representing our company’s sound philosophy.
Well-recognized power supply
The power supply is highly reputable for its super-low noise and high speed. PREDA is equipped with 2 independent power supply units for L/R channels. These power supplies are packaged in series to cancel unnecessary leakage flux from the transformers.
Balanced Input has Instrumentation Amp Structure
An Instrumentation AMP is used for the input of XLR balance signal. Output goes through Aurora-AMP module, which has high precision with balanced transfer circuit, allowing well balanced transmission of the signals. It requires a total of 4 modules in order to accomplish a completely balanced architecture including AMP and volume control for L/R channels. In addition, attenuation level in the HOT and COLD circuits, frequency responses, distortion must be identical in each channel. Otherwise, the differences will surface in the output stage. On the other hand, there are substantial merits such as immune to external noises and cable length. For these reasons, PREDA adopted balanced structure.
INPUT Line-level RCA Unbalanced x4, XLR Balanced x2OUTPUT RCA Unbalanced x1, XLR Balanced x1 (#2HOT is convertible to #3 HOT with Global Phase Invert)GAIN 10dB, -6dB at Gain select SW onFrequency Response 5Hz - 100kHz /1.5dBTotal Harmonic Distortion 0.008% A weightedINPUT/OUTPUT Impedance Input 56kΩ / Output 47ΩFunction 54-Step Volume Control, add. 16step at Low Gain mode, L/R Balance Control, Mute, Display On/Off, Input Selector x6, Global Phase Reverse, Remote Control for all functionsSize and Weight W 420 x D 330 x H 90mm, 10.8kg AC100-120V or AC220-240VAurorasound is a company from Yokohama, Japan. Designer and director Shinobu Karaki has 28 years expierience working for Texas Instruments Japan Inc. He is also a passionate musican, music teacher and an audiophile first grade since many years. His love to music, trained ears and extensive know-how in electronics and integrated circuits makes Mr. Karaki-san the ideal person to design high-end audio devices. Web: www.highend-electronics.com As a business we have to collect 8% TAX from buyers in California
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