APERIO front Electronics

APERIO Specifications


Configuration Open-back; circumaural type
Transducer Balanced-Drive High Precision Electrostatic Laminate (BD-HPEL)
Effective Diaphragm Area 3570 mm2
Frequency Response 10 Hz – 60 kHz
Output Level (SPL) Compliant with EN 60065/A12:2011 (EN50332) when driven by APERIO electronics (for all inputs); digital input: ∽ 104 dB; analog input: ≥ 106 dB (continuous, est.)
Ear and Headband Cushions “Cabretta” top-grain, sheepskin leather; perforated surface on ear cushions
Input Polarized, 4-pin, self-latching connectors for left and right channels
Drive Cable Dual mono, shielded, ultra-low capacitance; silver-plated OFHC ultra-fine stranded copper, with silicone insulation and Kevlar reinforcement; 2 meter length
Weight 405 grams (14.3 oz.), without cable


Balanced Analog Inputs Dual (female) XLR jacks; switchable (high / low) input range; 18 dBu / 10 dBu
Unbalanced Analog Inputs Dual RCA jacks; switchable (high / low) input range; 5.0 Vrms / 2.1 Vrms
USB Digital Input Type B jack; USB 2.0; accepts digital audio formats up to 32-bit / 384 kHz PCM and DSD (DSD64/DSD128/DSD256) via DoP or Native
Network (Ethernet LAN) Digital Input RJ45 jack; DLNA-compatible; accepts digital audio formats up to 32-bit / 384 kHz PCM and DSD (DSD64/DSD128/DSD256) via DoP or Native
AES3 (AES/EBU) Digital Input XLR (female) jack; accepts digital audio formats up to 24-bit/192 kHz PCM
S/PDIF Coaxial Digital Input RCA jack; accepts digital audio formats up to 24-bit/192 kHz PCM
Line Outputs Balanced and unbalanced, high current outputs; +5 dB gain; switchable
Digital Formats PCM: 16-32 bit / up to 384 kHz; DSD: up to 256 fs DoP and Native
Digital Signal Processing (DSP) 64-bit (double-precision) fixed-point processing at native sample rates
Switchable Gain Rear panel switch; high level / low level selection for balanced analog input (professional audio and consumer levels) and unbalance analog input
Source Selection Multi-position front panel selector with indicator LEDs for all sources
Level Control Front panel, 31-position; digital and analog domain volume control (HP & Line Out)
Status Display Front panel, 51 mm, full color, QVGA, TFT LCD (240 x 320 pixels)
Display Functions Digital readout and bar graph of volume control setting; display of digital audio data format; display of rear panel analog input (gain) settings; display of Ethernet and USB data link transmission lock; display of detected fault modes and output clipping
Auto Fault Detection Automatic detection, display and protection for: output amplifier clipping, unplugged connections and malfunctioning wiring, over-temperature conditions and internal electrical faults
DACs 2 x dual mono, 32-bit / 384 kHz DACs with balanced outputs, for PCM & DSD inputs
Amplifier/Energizer Balanced, discrete MOSFET, high-bias, single-ended Class A output; dual mono topology, including power supply; 1800 VDC bias (charge) voltage
Distortion + Noise < 0.001%
Bandwidth > 65 kHz
Enclosure CNC-machined 6063 aluminium; earth-grounded
Power Supply External: world voltage compatible (90-264 Volt AC, 50-60 Hz); 24 Volt DC, 200 VA (8.333 A), fixed frequency, class B-compliant SMPS

Internal: isolated, dual mono; switching and ultra-low-noise linear regulation

AC Mains Types B, G, F, I; IEC-60320 C14, earth- grounded power cable; 1.5 meter length
Dimensions H x W x D: 68 mm (2.68 in.) x 413 mm (16.26 in.) x 351 mm (13.82 in.)
Weight 7.4 kg (16.28 lbs.), without Power Supply