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Why does a relay make sense when switching power ?
Amplifiers generate unwanted output signals when applying or removing power,
which can damage the connected headphones. The relay breaks the connection
between amplifier and headphone and thus protects the latter until electrical
conditions have stabilized.
Some words about the different digital input options.
Currently the HPA V280 can be fitted with one out of seven D/A converter types,
with three different inputs and a max. sample rate of 96 or 192 kHz:
The
COAX
input accepts digital PCM audio data in S/P-DIF format, at sample
rates from 28 to 108 kHz (or 210 kHz resp.).
The
OPTO
input, fitted with a TOS-LINK interface, accepts digital audio data at
sample rates from 28 to 108 kHz (or 210 kHz resp.).
The
USB
type
“B“ input can be connected to a host computer (PC or laptop).
The USB module will automatically be detected as an audio device.
The
USB 96
input is compatible with USB 1.1 and 2.0 standards. It accepts
digital audio formats up to 24 bit at sample rates of 44.1, 48 and 96 kHz, while
88.2 kHz is not supported.
The
96 kHz
digital modules comprise a D/A converter with a dynamic range of
110 dB and
–100dB THD+N, thus ranging in the upper-mid performance class.
There are
TWO
different
USB 192
modules, compatible with the USB 2.0
standard. Both require a proprietary driver, which can be downloaded from
www.violectric.de
.
Digital audio formats up to 24 bit at sample rates of 44.1, 48, 88.2, 96, 176.4
and 192 kHz are supported, as well as the so-called
“asynchronous mode”.
By now we recommend the
“Tenor” chip-set for Windows applications and the
“X-Mos” chip-set for Mac users.
The
192 kHz
modules are equipped with a top-notch converter offering a 115 dB
dynamic range and
–103 dB THD+N, along with significantly improved analog
output circuitry.
Please note:
-
The digital input has priority over all other inputs and will mute these when a
valid digital signal is detected
-
When a USB cable is inserted, it may be required to restart running media
applications on the host.
-
Volume control of the host application should be set to 95-100%.
