Owner`s manual

8
Ayon Audio – Hart 18 – 8101 Gratkorn – Austria – Phone: [phone]
www.ayonaudio.com
2. Connecting
To assure reliable operation always turn the Vulcan OFF while making or changing input or speaker
connections. No connections should be made while the amplifier is ON.
► All input and output connectors are clearly marked on the rear panel ◄
R e a r p a n e l
● input ( RCA or XLR )
● speaker output terminal ( common , 4 Ohm or 8 Ohm )
● bias – setup push button for auto-fixed-bias system & tube test program (operation by pen)
● USB “type A” interface for updates/diagnostics via PC – (factory use only, no user options available)
● bias LED indicator for AA62B ( V1 & V2 )
● bias meter selector: position 2 Bias 1
● power inlet - with fuse
● ground switch
● toggle switch for RCA or BAL (Balanced) mode
● toggle switch for input sensitivity “Gain” 0dB and –6 dB
● power phase indicating lamp – 230V Schuko only
INPUT CONNECTION: Select RCA or XLR input to connect your preamp and set toggle switch
accordingly.
Remark: The amplifier has a special single-ended circuit design; therefore we recommend the use of the
asymmetric RCA connection!
Note for XLR: The XLR input is not a completely symmetric connector but only a "quasi" symmetric
connector, because the VULCAN is a single-ended amplifier; i.e. the XLR pins 1 (ground) and 3 (minus)
are connected by a small jumper-wire.
We provide this XLR connector, because some customers possess more expensive XLR cables and may
want to continue to use them; in this case you have to pay attention to the wiring of the output of the
preamplifier or to the configuration of the XLR-pins.
The configuration of the VULCAN is: pin 1: ground / pin 2: plus + / pin 3: minus –, with pins 1 and 3 short-
circuited.
In case your preamplifier has an inverted XLR connector (pin 1: ground / pin 3: plus + / pin 2: minus – ) you
must open the internal jumper between pin 1 and pin 3.
Furthermore, in connection with the XLR connector a hum loop may occur (primarily in one channel only).
First, open the jumper between pin 1 and pin 3. In case the hum loop continues, perform this measure
also at the second channel. Grounding always applies to the overall installation; hence the hum is most
efficient where the biggest difference in grounding potential appears.
 In any case connect with an experienced audio dealer for these works.