Owner`s manual

9
Ayon Audio – Hart 18 – 8101 Gratkorn – Austria – Phone: [phone]
www.ayonaudio.com
INPUT GAIN: Select via toggle switch between 0dB and -6dB. Activating the switch while the VULCAN
is running, could cause switching noise.
LOUDSPEAKER CONNECTION: There are three sets of gold speaker output terminals at the rear panel:
common, 4, 8, ohm. Connect the speaker input terminals to corresponding speaker output terminals
at the rear panel according to the impedance of the speaker with high quality audio cord.
Pay close attention to proper matching of positive and negative and left and right channels.
Note: in general, connecting the Vulcan and the speakers with the 8 Ohm terminal will result in a
slightly better sound, even if the nominal impedance of your speakers is 4 Ohms. But this effect differs
from speaker to speaker. We encourage you to check it out yourself: listen to you favourite music with
both the 4 and the 8 Ohms connection and then decide according to your personal taste.
Note: switch the preamplifier to “mute” before changing the wires.
POWER INLET: Plug the AC power cord into receptacle.
GROUND SWITCH: Make sure that Vulcan monoblock’s are grounded to your wall ground first.
If there is a hum loop (hum audible from more than 1 meter from the loudspeakers) flip the
grounded/ungrounded switch. If the hum doesn’t disappear then use a two prong plug to “float” the
Vulcan. Due to the amplifier’ high power rating, it is important to assure the good quality power line . It is
recommended that all units (preamp, CD-Player etc.) are connected to the same phase of the power
line. Otherwise, a high level of hum can be present. Another source of hum can be equipment stacked
on top of one another. This is not a good plan from the ventilation standpoint generally and it is likely to
introduce hum, buzz or noise into the system. Certain gear radiates magnetic fields or high frequency
noise around its chassis and other gear may be prone to receiving these fields. It’s also advisable to keep
signal and power cables separate where possible. Distance helps greatly .
USB Service plug
1. Here various operational parameters, i.e. bias, negative grid bias voltage, circuit protection, delay
time for switching on and off, tube test programme, mute and logo function and so on, can be changed
with a computer.
2. The USB also serves as a diagnosis port where the service technician can check the operating modes
on the computer screen, e.g. bias value, grid voltage, state of the tubes, operating hours, on-off-cycles,
and so on; hereby he can recognise problems.
3. Furthermore, software-updates can be performed by the manufacturer or service personnel
respectively.
PHASE INDICATOR: When the power phase control indicator glows red the Phase polarity is wrong.
Reverse the AC plug! This feature was developed only for the safety plug version (EU). For non-EU-
countries it can be switched off by means of an internal switch.
The phase-light can always glow in the following cases even if the phase is applied correctly:
● in an old electrical installation (old buildings) where the neutral conductor voltage mostly is higher than
0V and this is already sufficient to bring the lamp to glow.
● when an external AC generator is used with a 2 x 115 V balanced output or with a so-called external
isolation transformer or power line conditioner.
It is recommended that you do not use a power conditioner etc. as it may limit the current
available to the amplifier.