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| | | Order to enjoy full reduction:$3580.00 |
| | | | Order to enjoy full reduction:$5510.00 |
| | | | Order to enjoy full reduction:$3782.00 |
| | | | | | Order to enjoy full reduction:$8850 |
| | | | Order to enjoy full reduction:$8999 |
| | | | Order to enjoy full reduction:$2999 |
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- A small amount of spot delivery is in progress. . .(There is also a limited edition femtosecond crystal oscillator customized version)
Development Introduction:
- Red Core has been paying attention to AKM’s latest flagship decoder AK4499. It has been pre-researched since the end of 2018. After more than half a year, it has been revised four times in a row. The Red Core AK4499 decoder will be launched soon.
- AK4499 is the first current-type DAC of AKM. I look forward to its sound like everyone else. Indeed, it did not disappoint me.
- AKM4499 has built-in 4-channel independent DAC channels to achieve higher resolution stereo sound through pairwise association.
- The decoder adopts the red core classic dedicated FPGA decoding control board to realize the design architecture of digital and analog independent of each other
Configuration introduction:
- Silver: Silver AK4499 machine
- Black: Black AK4499 whole machine
Features:
- FPGA master control, control and decoding are each a motherboard, digital and analog are designed separately to eliminate mutual interference
- FPGA control logic adopts synchronous design idea. That is, external signals are sampled, and I2S and DSD timings are reconstructed from the local clock. Unlike traditional CPLDs, which only do the simplest gating control, only large-scale FPGAs have enough resources to synchronize all signals. If the description is improper, the harm caused by the non-synchronous combinational logic strobe is increased signal jitter, signal timing misalignment, resulting in “metastability”, “competition” and &ldquo ;Adventure”(Technical terminology in logical description), Which eventually leads to errors in critical audio data, which is unacceptable for audiophiles with demanding sound quality.
- DSD hardware solution, full interface supports DSD
- FPGA control board realizes SPDIF to I2S separation function, DoP protocol, etc., are all completed by FPGA control board, so that digital and analog are independent of each other
- HDMI input supports DSD512, PCM768K(When I2S or DSD source code is input, we can display the specific sampling rate of the currently input PCM song and the specific specifications of the DSD song. This function is unique to Red Core)
- USB input supports DSD512, PCM384K, automatically analyzes and displays the input song specifications
- Built-in compatible Italian USB interface(It can be connected to an Android phone to output high-quality music through this decoder, and the support of the phone is required)
- Simulate single-ended, native full balance(True balance)Output
- Using genuine 3.2-inch Tianma HD display, screen resolution(480 X 320), The display content is concise and generous, vector font display, with higher definition than traditional display, the screen can be turned off when listening to music at night
- Support remote control and panel volume, filtering, input source switching, all operations are automatically stored and memorized.
- Op-amp: The design uses 4 dual-op-amps and 2 single-op-amps, and the shipment is(OPA2604 X 4 pcs + LME49710 X 2 pcs or AD797 X 2 pcs)
- Upgradeable firmware(Firmware: The control program of the decoder itself. When a new function is released, the customer can upgrade the system through the SD card, or develop a new firmware to improve the system performance or sound quality. The official release of the red core will be unified, and the customer can upgrade by themselves. The upgrade process is simple and fast . Firmware download address: www.hxmelody.com Firmware download area)
- More reasonable power supply design scheme, strictly control the heat of the whole machine, avoid the machine from being turned on for a long time or the machine overheating caused by high ambient temperature and accelerating the aging of the internal components, you don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t have to worry about the machine heating up for a long time.
- Intelligently analyze the input signal and completely shut off the power of AK4499 when it loses lock and standby, reducing the power consumption of the whole machine
- Using 2 imported 25w talema potting transformers, digital and analog independent power supply, enough power to escort the output high-fidelity sound quality
- Original ON Semiconductor high-speed, high-power, low-resistance rectifier, up to 8A, low heat. Using original ELNA, Panasonic FC, AVX tantalum capacitors, Linear Technology, Omron relay, Furukawa tail plug and other imported components.
- Rich input interface(Coaxial, optical, BNC, AES/EBU, USB, HDMI),When HDMI input, DSD OE signal is not needed, it is intelligently identified by FPGA internal logic.
- Chassis size:(Length: 430mm, Width: 267mm, Height: 75mm)
AK4499 Decoderindex
- Standard input interface:
- SPDIF, coaxial, optical, BNC, AES digital balance(These ports all support DSD DoP input)
- HDMI source input, USB(Support I2S, DSD DoP, DSD native source code input)
- Input frequency: 44.1K, 48K, 88.2K, 96K, 176.4K, 192K, 16-24BIT automatic recognition
- Single-ended rated output: 2.8Vrms
- Balanced rated output: 5.6Vrms
- Frequency response: 5-20KHz+-0.1db
- Whole machine power: <= 30W
- Some parameters of the chip:
- Total harmonic distortion: -124dB
- Dynamic range: 137dB
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FPGA main control board diagram![](https://img.alicdn.com/imgextra/i3/104310323/O1CN0110pY6p1EFyTtbVovK_!!104310323.jpg)
AK4499 decoding motherboard diagram
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