Product parameters:

Signal to Noise Ratio:

RCA≥110dB (A-weighted, optical input).

XLR≥112dB (A-weighted, optical input).

RCA≥105dB (A-weighted, analog balanced input).

XLR≥110dB (A-weighted, analog balanced input).

Distortion: ≤0.007% (1KHz, A-weighted).

Rated impedance: 8Ω

Separation: ≥105dB (A-weighted, optical fiber input)

≥100dB (A-weighted, analog balanced input)

Supported protocols: mp3, wamp

Material: aluminum alloy

Appearance color: silver black

Net weight: 10.95kg

Gross weight 15.45kg

Machine size: 444x76(89)x395(420)mmW x H x D (including machine feet)

Package size: 615x191x550mmW x H x D

Applicable occasions: listening rooms, clubs, demonstration halls, banquet halls, performance halls and other venues for high-quality music in a large environment.

1: DSP electronic frequency division circuit

2: Tweeter Midrange woofer independent output

3: 32-band EQ precise equalizer

4: Fully balanced input interface

5: Flagship digital receiver chip

6 : Precision electronic volume chip

7: High-end DAC decoder chip

8: Microphone automatic test

Design ideas:

1:Causes of sound quality deterioration: Power crossover (passive crossover)

●Passive crossover: The crossover network is usually built into the speaker (commonly known as the crossover). It divides the full-frequency power signal directly from the power amplifier into different frequency bands for power output, and then drives the load to the speaker for response.

●The crossover area of the crossover point of the power crossover has uncontrollable nonlinear phase shift and distortion

●It is difficult to use a power crossover to correct the frequency response of the speaker that is not flat, and the canine-shaped frequency response curve is still the same

●Due to physical characteristics, the large inductance of the power crossover will reduce the damping coefficient of the power amplifier, and the capacitor will damage the higher harmonics in the music

●12db octave attenuation will steal a lot of precious power

●Complicated frequency division network will bring crosstalk between various audio channels, which will degrade and spoil the hard-won HIFI signal of the front and rear stages, making the front stage and power amplifier seriously lying.

2; Important improvement method: DSP electronic frequency division

●Active crossover: The DSP electronic crossover circuit and multi-segment EQ adjustment frequency response curve circuit inside the previous stage replace the power crossover in the traditional speaker. The full-frequency signal is divided into different frequency bands in advance, and then sent to the power amplifier for amplification, and finally output to the high, medium and woofer speakers respectively.

●The use of advanced DSP technology can ideally design the crossover point to achieve phase characteristics far superior to traditional power crossovers

●According to the inherent properties of the unit, use the DSP parametric equalizer to ideally correct the frequency response of the speaker

●Each power amplifier independently drives one unit from beginning to end, greatly improving the sound purity

The power output goes directly to the speaker, eradicating the scourge of the power divider, thus achieving a great increase in power, superior sound quality, and a strong sense of direct expression.

The IC chip adopts the AK4118 chip produced by Japan AKM Company, which is a digital audio transceiver that supports a 192kHz, 24-bit channel state decoder. The chip has a digital de-emphasis filter, which can improve the signal-to-noise ratio of high-frequency modulation, so that the audio signal is more restored and the sound details are richer.

1: Using 6 pieces of ADI's advanced DAC chip AD1955 to form a 6-channel fully balanced DAC circuit, the dynamic is up to 123dB

2: Using a fully balanced circuit for design, starting from the DAC, we know that the output is fully balanced, which can bring the lowest distortion and the most balanced sound performance;

3: The left and right channels are divided into high, medium and low channels, totaling 6 channels, all of which are fully balanced and are actually 12 channels

The volume control range can be from -111.5dB to +31.5dB step with a fineness of 0.25dB. The sound level changes extremely smoothly. The biggest advantage is that it completely solves the poor contact and adjustment noise caused by the wear of carbon brushes that cannot be solved due to the long use of traditional audio potentiometers.

AD-8PRE adopts the flagship chip MUSES72320 of Japan JRC Company as the electronic volume control chip, which is a two-channel electronic volume controller mainly used for high-end audio equipment. In order to pursue high sound quality, and ensure wide dynamic range and high S/N ratio, the chip has a working voltage of +18V; the internal potentiometer adopts a ladder resistor, which has the characteristics of low distortion rate and low output noise.

Flagship HI-END high-end materials

Signal coupling adopts ELNA audio special capacitor.

The whole machine adopts high-precision and low-noise metal film resistors.

Signal switching uses advanced relays instead of electronic switches.

Filters and power supply decoupling use CBB and metal film capacitors.

Gold-plated 4-layer circuit board, 23 pieces of BB's advanced operational amplifier OPA2134.

Custom Capacitors

The filter capacitor adopts ELNA large-capacity and high-quality capacitor, and the signal coupling capacitor adopts ELNA audio-specific capacitor, which provides a strong guarantee for soft and elastic low frequency, pure and warm intermediate frequency and delicate and transparent high frequency.

1: Using high-quality steel strips and high-purity toroidal transformers, low magnetic flux leakage, high power

2: Multiple high-frequency low-loss capacitors are filtered in parallel to reduce impedance interference.

3: Using full analog power supply, pure interference is small

4: Using a high-precision linear regulator.

1: Shaped electronic crossover design software

Graphical computer-side crossover design software is provided to professional users; There are low-pass, high-pass and band-pass filters, and the filter frequency and slope can be selected; The level and mutual relationship of each channel of high school and bass can be adjusted The delay time; ·You can drag and change the frequency response curve arbitrarily with the mouse; ·You can use the matching test microphone to test the real frequency response of the speaker.

2: Shape the speaker frequency response correction

Whether it is electronic crossover or used to drive traditional speakers, AD-8PRE can use DSP technology to correct its frequency response to an ideal flat state; The mouse can be used to drag and change the frequency response curve arbitrarily; There are 11 independent segments Parametric EQ is used by users to tune their favorite sounds.

3: Automatic test and calibration

Whether it is electronic crossover or power crossover, users can use the attached design software to perform automatic frequency response test, the computer automatically calculates EQ parameters, and performs automatic frequency response correction; on the basis of automatic correction, it can also be manually adjusted; design The software also provides import and export functions for a full set of parameters, and users can communicate their designs on the Internet.