Audial AYA 4, User Manual

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AYA 4 DAC
Audial AYA 4 is a high quality, TDA1541A based non-
oversampling D/A converter, with USB and S/PDIF
inputs.
The AYA 4 USB input stage operates as asynchronous
(master) USB device, so it also generates the clock
signal for D/A conversion.
Two low jitter clocks are included, one that works with
44.1/88.2/176.4/352.8 kHz, and the other that works
with 48/96/192/384 kHz audio sampling frequencies.
This way the unit achieves clean clocking scheme, and
all the audio clock signals in the system are generated
only by frequency dividing, and not by using PLL
synthesizers.
The units with 11.2896/12.288 MHz master clocks can
accept up to 192 kHz, and units with 22.5792/24.576
MHz up to 384 kHz audio sampling rates.
The USB stage also provides galvanic decoupling
between the USB and D/A stage, thus also separating
PC from audio circuits.
The S/PDIF stage provides real 75 Ohm BNC,
transformer coupled input, and is operational up to 96
kHz.
Optionally, AYA 4 can provide PCM direct input to
TDA1541A, by using PCB U.FL connectors, and it can
accept I2S or simultaneous data protocol. The
information about such optional features is provided
separately, to the individual customers.
USING THE AYA 4
AYA 4 mains connector and switch are located on the
back plate, while the USB / SPDIF input selector is
located on front plate, along with the LED indicator,
which lights green for USB, and orange for S/PDIF
input.
AYA 4 DAC is easy to use device, and for normal use it
requires no special maintenance or care.
It is however not recommended to leave the AYA 4
permanently powered up, because its D/A converter
chip (TDA1541A) is a classic TTL architecture, so it
dissipates more power than it is usual for devices of this
kind these days. Normally, leaving the AYA 4 powered
off overnight will ensure many years of reliable
operation.
AYA 4 achieves claimed technical performance
(distortion, frequency response etc.) right from the
start, however it needs a couple of weeks of burning in
to perform its best in subjective sonic terms.
WARRANTY
Audial claims proper working of this product for two
years. Audial is obliged to correct any malfunction
within this period, at no charge, either by competent
repair service, or by swapping the sold unit by the new
one.
For the units sold directly by Audial, invoice is also
guarantee certificate. Since Audial maintains own data
base of directly sold units, the original buyers in most
cases won’t need it. Warranty is still fully transferrable
from original to subsequent owner(s), however in this
case we will probably ask for the invoice.
3 Audial AYA 4