A reference-grade Integrated Amp, with the heart of an Aurender
An elegant one box solution for the purist
All the digital connectivity you need - Ethernet, 2 x TOSLINK, 2 x BNC, coaxial, 2 x USB
Reference grade internal D/A converter built around a pair of AKM4497 chips and a temperature-stabilised OXCO clock.
“AP20’s OCXO based precision clock generation system incorporates a Field-Programmable Gate Array (FPGA) with sub 100fs jitter-reducing clock generator to precisely time digital audio data transmissions and minimize jitter to below negligible levels.”
Also on the back panel are two empty HDD/SSD drive bays which effectively turn the AP20 into a music server with drive content navigable via the front panel display or associated smartphone/tablet app (that integrates Tidal and Qobuz). The AP20 also supports Apple AirPlay and Spotify Connect.
Vinyl purists would like the fact that signals arriving at the A20’s analogue inputs (balanced or single-ended) arenotdigitised upon entry. They follow the same all-analogue journey as those already processed by the DAC: specifically, an analogue R2R stepped-attenuator volume control and dual mono amplification with each amplifier channel enjoying its own toroidal supply.
In fact, a total of six discrete toroidal transformers power the CPU, left & right DAC boards, FPGA processor and amplifier modules. Those amp modules are Class D and come from Purifi: the Bruno Putzeys-designedPurifi 1ET400Athat, implemented here, promise 350wpc into 4 Ohms or 200 WPC into 8 Ohms.
A quarter-inch headphone socket and balanced XLR outputs – that effectively turn the AP20 into a pre-amplifier – round out the feature set.
Features:
Purifi 1ET400A Eigentakt dual-mono power amp modules pushing 200 WPC into 8Ω, 350 into 4Ω
Fully linear PSU block with exceptionally high-end discrete toroidal transformers (6 of them, actually!)
R2R stepped-attenuator analog volume control
Dual-Mono AKM4497 DAC boards
Precision OCXO rev 2 internal clock
Analog inputs with pure analog pass-through (hello, rosy tube phono stage )
Analog output (for subwoofer? secondary/distributed audio system?)
Digital inputs (coax & optical)
2x User-Installable drive bays for SSD/HDD storage
10 MHz Master Clock input
Specifications
Is a Streamer: ✅ Yes
DAC: (dual mono) AKM4497 ✅ Yes
Clock: OCXO V2 ✅ Yes
Bit Rate Capability: 32 bit/768 kHz
Digital Inputs: opt (2), coax (2), USB B (2), Clock (1) ✅ Yes
HDMI ARC Input: ❌ No
Output: XLR audio, Speakers ✅
Headphone Amp: 1/4" ✅ Yes
Variable Audio Out: ✅ Yes
Subwoofer Out: ❌ No
Roon Ready: ✅ Yes
Amplifier Specifications
Amplifier Module 2x Purifi 1ET400A Class D Amplifier Module in Dual-Mono Configuration
Rated Output Power 200 W into 8 ohms / 350 W into 4 ohms
THD (20Hz-20kHz) 0.003 % (1W to 200 W, 8 ohms and 4 ohms)
Damping Factor 800 (ref. 8Ω 20 Hz to 6.5 kHz)
Output Impedance <65μΩ @ 1kHz
Power Configuration Full linear & Dual-Mono - 2 x 400VA Audio grade TOROIDY toroidal transformers
Power Supply Filter Capacitors Total 80,000uF ( 40,000 uF / channel)
Binding Posts WBT nextgen™ pole terminal - Signal conductor made of pure copper
