FiiO vient d'annoncer son nouveau DAC/ampli casque K11 qui entend faire grand bruit chez les audiophiles. En effet, celui-ci est doté d'un étage de conversion R2R (à réseau de résistances) une technologie habituellement assez coûteuse et réputée être le nec plus ultra d'une certaine forme de raffinement dans le traitement audionumérique. L'appareil revendique une puissance max de 2 x 1,3 watts sous 32 ohms sur sa sortie casque symétrique au format jack 4,4 mm. Il accepte les flux numériques jusqu'en PCM 32 bits/384 kHz et DSD256. Son circuit DAC R2R à quatre canaux en différentiel est précédé d'une puce FPGA.
Le prix du FiiO K11 est de 169 $ ou 149 £ (on ne connait pas encore son prix en euros).
Ci-dessous la présentation (en anglais), les spécifications et images officielles :
July 8, 2024
Announcing the K11 R2R: FiiO's first Desktop Headphone Amplifier with a Four-channel Fully Differential 24bit R2R DAC
Both 6.35mm and 4.4mm headphone outputs alongside Coaxial, Optical, USB Type-C, and RCA connections. 1300mW+1300mW Output Power with three gain levels and three independent volume curves. Available from late-July, priced: £149 / $169.
The FiiO K11 R2R Desktop DAC/Amplifier is a versatile low profile Desktop Headphone DAC and Amplifier. With multiple inputs — including USB-Type C, Optical and Coaxial — as well as 6.35mm/4.4mm headphone outputs and RCA stereo line-out, the K11 R2R also features a 1.1-inch VA display which can display information about the audio file being listened to.
Building upon the success of the original K11, the new K11 R2R is the first FiiO DAC/Amplifier to feature a four-channel fully differential 24bit R2R (Resistor-to-Resistor) DAC for a smooth, natural sound output. Offering full support for 32-bit/384kHz and native DSD256 Hi-Res audio files, FiiO has engineered the compact K11 R2R to deliver a power output of up to 1300mW.
The K11 R2R's multi-function volume knob allows total control of the unit. Power the device on and off; access the menu; adjust volume, and more. Users can also quickly switch between Line Out (LO), Pre-out, and Power Out (PO) modes by simply double-pressing the knob.
The K11 R2R is an ideal companion to the SR11 streamer which has an identical form factor, creating a compact headphone listening system.
FiiO K11 R2R is available in either Obsidian Black or Midnight Silver from late July, priced £149 / $169.
A red version of the K11 R2R will launch later this year.
K11 R2R KEY FEATURES:
True 24bit R2R DAC Resistor Arrays
The K11 R2R features FiiO’s four-channel fully differential 24bit R2R DAC. Developed in-house, this DAC consists of 2 x 48 precision thin-film resistor arrays per channel, totalling 192 resistors with 0.1% tolerance and low-temperature drift (30ppm).
The fully differential architecture offered by the K11 R2R serves to deliver lower noise than typical architecture — as well as less FFT (Fast Fourier Transform) harmonics — delivering a smooth, rich, and highly musical sound signature.
Complementing the DAC within the K11 R2R is a 4-channel electronic volume controller. This resistor ladder electronic potentiometer delivers both low distortion and low noise, allowing for a highly precise volume adjustment.
3 Gain Levels & Independent Volume Curves
With 3 independent gain-levels and volume-curves (High, Medium, Low), FiiO's engineers have carefully designed the K11 R2R to give a better listening experience with various types of headphones - whether sensitive earphones or harder to drive over-ear headphones.
All-new Specially Designed Audio Circuitry
Within the K11 R2R, the audio signal is transmitted via a USB interface processor to a digital audio bridge. After being processed by an Field Programmable Gate Array (FPGA), it is sent to the R2R DAC for 4-channel output after decoding. It then passes through two OPA1642 op-amps for low-pass filtering and single-ended analog signal converting, before transmitting to the NJW1195A electronic volume control chip for precise volume adjustment.
The output stage of the K11 R2R uses two SGM8262 op-amps for 4-way phase inversion and amplification, resulting in both single-ended and balanced output signals.
Dual NOS/OS Modes
The FiiO K11 R2R gives users the option of choosing playback via either NOS (Non-Oversampling) or OS (Over-sampling) Modes. NOS Mode has been designed to maintain the original sampling rate for decoding, whilst the OS Mode upsamples audio to a high sampling-rate of 384kHz.
Easy Multi-functional Control
Designed to ensure various functions can be accessed simply and quickly, the K11 R2R’s multi-function volume knob is used to power the device on and off, menu operation, volume adjustment, and more. Power Out (PO), Pre-out, and Line Out (LO) modes can be selected by double-pressing the knob, making it easy to connect to different audio setups.
Once selected, these PO/PRE/LO modes handily remember the last volume set in each mode independently, so there is no need to readjust the volume when switching between modes.
Adjustable RGB logo lighting
The FiiO logo on top of the K11 R2R is illuminated with RGB lighting, giving a quick way to identify the sampling rate of the current audio being played back. Brightness, colour, light patterns, and on/off options are all adjustable within the menu.
FiiO K11 R2R Specification:
DAC Fully Differential True 24-bit R2R Resistor Arrays Main Control Chip GD32F303RET6 Output (6.35mm Single-ended) L+R≥460mW+460mW (32Ω, THD+N＜1%)
L+R≥50mW+50mW (300Ω, THD+N＜1%)Output (4.4mm Balanced) L+R≥1300mW+1300mW (32Ω, THD+N＜1%)
L+R≥220mW+220mW (300Ω, THD+N＜1%)Inputs 1 x USB Type-C
1 x Coaxial
1 x OpticalOutputs 1 x 6.35 mm (Single-ended)
1 x 4.4 mm (Balanced)
1 x L/R RCA
1 x CoaxialUSB Input Decoding PCM: 384kHz/32bit
DSD: 256Coaxial Input Decoding PCM: 192kHz/24bit Optical Input Decoding PCM: 96kHz/24bit Line-out (LO) Mode Yes Power Out (PO) Mode Yes Display 1.1-inch LCD VA Segment Display Adjustable
RGB LightingYes Dimensions 147 x 133 x 32.3 mm Weight 420g Available Colours Obsidian Black
Midnight Silver
