Equipped with a "ES9018K2M" ESS made DAC by Sabre offers the highest in digital conversion.
A fully balanced configuration circuit from Dac to Amp
3 Headphone output connection options. Single ended 3.5mm output , Dual mini 2.5mm balanced outputs, Single balanced TRRS
Balance headphone connection via BTL circuit
Includes a large-capacity lithium-ion rechargeable battery
Apple iOS compatible Connect to an iPhone, iPad, or iPod via Lightning connection
REX-KEB03 Digital input Connections
REX-KEB03 is MFI Apple certified Dac. Which means it will digitally handshake directly with the various Apple Lightning equipped devices such as the iPhone®, iPad®, iPod touch®. No Apple Camera Connection Kit is required. Of course it will also connect to the the latest smartphones with the Android OS. It is recommended to update your device to Android OS Lollipop. Devices such as Xperia®Z3, personal computers such as Windows®PC or Mac® with a USB connection can also be connected. Devices with a digital Toslink output such as the Astell & Kern, Questyle and other portable players or stationary CD player can also be connected.
When the REX-KEB03 is connected to an Apple device, it is recommended that you use high-resolution playback application such as ONKYO HF Player ( paid version, etc.) or Flac Player. This will allow music playback at the highest native resolution such as DSD128 and L-PCM. Native resolution is played back utilizing these Applications vs downsampling, which is what typically can happen with a lot of smartphones.
The RAL REX-KEB03 will also be shipped with a Xperia connection cable. This is a Sony proprietary cable that is hard to source. Compatible for the following devices: NW-ZX1 / NW-F880 series connection, WALKMAN compatible
By connecting to the NW-ZX1, NW-F880 series device utilizing the SONY WMC-NWH10 USB connection, to the KEB03 you can transfer L-PCM up to 24bit / 192kHz from WALKMAN.
The RAL REX-KEB03 can be mounted to a USB Audio Class2 (High-Speed) Android OS devices via a USB-OTG cable.
USB Audio Class2 (High-Speed) are required with Android devices to transfer higher resolution audio formats. This can vary from Android App to Andriod App. Please check with App's associated website for more information
Connected to a Windows PC requires a USB Audio driver see below for driver downloads. No drivers are required for Mac OS computers. Mac (OS X 10.6.8 and later) operates with the OS standard USB driver.
See Moon Audio Blog section for more information on connecting portable Dacs to computers. Setting vary from Audio Software Application to Application. We recommend Jriver as your audio playback software suite.
The REX-KEB03 utilizes the Sabre 9018C2M reference Dac chip to do all it's digital to analog conversions. This chip is a high performance 32 bit, 2 channel; Audio D/A converter precisely designed for audiophile critical digital conversion. It is the ESS patented 32-bit HyperStream Dac architecture and Time Domain Jitter eliminator. The digital section delivers 127db and THD+N of -120db. it can handle up to 32bit 384kHz PCM data via I2S from either the USB receiver chip or the Toslink receiver chip. Toslink is limited however to 24bit 192kHz input resolution.
ESSD / A converter to be mounted on the REX-KEB03 it is equipped with a high ESS ES9018 low-power version ESS "ES9018K2M" in the series of evaluation as a converter for high-end audio. High-speed (80MHz) uses the ESS own jitter removal algorithm and a digital filter according to the clock.
2 groups equipped with a high-precision crystal oscillator module
employs a fully balanced configuration circuit to maximize the power of expression
The body of the REX-KEB03 equipped with two independent high precision crystal oscillator module (22.5792MHz, 24.576MHz). The data inputted from the USB accurately converted to I2S signal and is supplied to the DAC unit. In addition, music data that is output from the DAC, via a fully balanced configuration circuit of the independent left and right up to the headphone output after the I / V conversion, we have to maximize the music itself expressive power.
Headphone output corresponding to the four types of mode Output 2 system equipped with a balance and a single-ended output
REX-KEB03 Headphone Amp
The RAL utilizes a bridge-tied load (BTL) amplifier circuit or what they are calling RAL mode. This is a bridged mono output configuration. It is a form of impedance bridging used mostly by the professional audio market. Two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed. Thus there are 4 amplifier channels in the RAL. The headphone, when connected between the two amplifier outputs, bridges the output terminals. This doubles the available voltage swing at the load compared to a single channel amplifier. The available voltage swing across the load is doubled at the same power supply voltage, but the maximum current output ability of the amplifier remains the same. Consequently operating a pair of existing amplifier channels in bridge mode doubles available power output to the load.The headphone sees twice the impedance since it sees twice the voltage at the same current. The balance headphone output utilizes the Texas Instruments TPA6111 Chips with an analog filter via the TPA6138A chip.
"RAL mode", can be utilized via 2x 2.5mm TR Micro jacks, which RATOC recommends for the balance headphone output. The 2.5mm TRRS has become the standard of Astell & Kern and thus was added out of market popularity. One of the 2.5mm Micro Jacks doubles as a AK connection. We will call "AK compatibility mode".
The single-ended headphone output is via the standard 3.5mm stereo mini-jack.
Windows Driver Instructions
Download Windows Driver