Waversa Systems Incorporated Mini HPA

Please note a price increase for 2021.  Buy 2020 stock, trades and demo for better pricing.  Email or call for details.
MAIN FEATURES    

 • Headphone Amplifier with DAC and Streamer  • External USB Storage  • Roon Ready    • DLNA Media Server   • Airplay   • MQA
EXCLUSIVE TECHNOLOGIES   • WAP - Waversa System Processor   • WAP-X - Waversa System Processor Extension   • WNDR - Waversa Network Direct Rendering   • Dynamic Range Enhancement Levels 1- 5     
 
 PHYSICAL CHARACTERISTICS     
 
 • Chassis: Aluminium   • Colour: Silver   • Input: Ethernet (with Native DSD), Digital Coax, Toslink, USB-B   • Output: Analog 1 x Balanced (XLR), 1 x Unbalanced  (RCA
• I/O: 2 x USB-A)   • Headphone Output: 2.5mm sym., 3.5mm, 6.3mm   • Dimension: W 180 x L 150 x H 37 mm   • Weight: 2 kg / 4.4 lbs  .• Power supply: 24V Adapter 90-120V AC / 180-240 VAC @ 50-60 Hz      
 
 SUPPORTED AUDIO/VIDEO FORMATS      

 •COAX: up to 24/192   •Toslink: up to 24/96   •USB/NET: PCM 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz
: DSD64, DSD128, DSD256  •ROON: FLAC, WAV, DSF, DFF, AIFF, ALAC, AAC, MQA   •DLNA Renderer: WAV, AIFF, OGG, FLAC up to 24 bits / 192 kHz   
 
 SPECIFICATION    
 
  •Linux 3.2x with 1GHz TI OMAP Processor ARM Cortex A8   •Ultra Low Power Universal Serial Bus Audio Class 2.0  •High Precision Dual MEMS 44.1/48 Clock   •Headphone Output: XLR 5.600mW (32Ω), 1,4A; RCA 2.800mW (32Ω), 0.7A

Nothing off the shelf
Here we are dealing with a technology
that converts every incoming signal into a
digital PCM signal with an extremely high
resolution of 32 bit/384 kHz from the very
first moment. The difference between
PCM and most other Class D amplifiers
starts here, because they usually convert
the incoming analog signal into a so called PWM , a pulse -width modulated
signal in which the width of a pulse is
varied - instead of the amplitude of the
incoming analog signal as in PCM. The
higher the amplitude, the wider the PWM
pulse.This principle is well known: The
first to try this technique in a commercial
scale product were Sony engineers they
used it on the famous and easy to repair
TA-N 88.
With Waversa, however, the entire
signal processing is completely digital,
even before the Class D end stage.As if
that weren't enough, the Koreans have
given some more thought to how the energy efficiency of a Class D amplifier
can be used without having to accept its
disadvantages such as limited bandwidth
and frequency response changes
depending on the impedance of the
connected loudspeaker. After the
analog signal has been converted, it
goes into a chip developed and
programmed at Waversa, which masters
a lot of arithmetic and converts the PCM
signal into PWM form.
The chip which has this task is called
Waversa Audio Processor , short WAP/
X. Regarding his arithmetic skills, which
are the things that he has mastered all
in real time include upsampling to 768
kHz , but also things like improving
sound quality by achieving a linear and
broadband frequency response up to
160 kilohertz , which is a record for
Class D amplifiers. All these calculations
take place directly on the chip.
Resistors or even coupling capacitors can
be saved in this way. And the WAP also
does something else: It forces the PWM
signal to the clock of the PCM signal - a
safe method of eliminating jitter and other
interference.
His programmers have also given him
one last feature, which they are proud to
point out: the ability to improve the
accuracy of detail and spatial
representation, independent of volume.
Among other things, this is achieved by
reconstructing even-numbered harmonics
of real music up to the 32nd harmonic -
something that is only possible through
various digital processes. The HPA 2,
weighing only 2 kilos as a headphone amp
, offers all this, only minimally slimmed
down in some cases, and even has a
symmetrical design. It also serves as a full
-fledged streamer and preamplifier, it can
handle DSD, MQA, and with external USB
memory it also has a NAS function and all
this leaves the viewer astonished. 

A .PDF review found here:  https://www.whatsbestforum.com/threads/waversa-systems-current-production-line-a-central-and-current-list-of-published-reviews.31222/

Fifth .PDF file from the left: "STEREO_2020-08_Waversa_WminiHPA_WminiAMP_MK2"