Table of Contents
Advertisement
16. Warning Messages
The ADI-2/4 Pro SE will show different warning messages and provide guidance in certain cases.
Hi-Power Mode Active
When Hi-Power mode is active with the Volume set higher than
-15 dB and a phone is plugged in, this message reminds the
user to check the current volume setting, and to make sure the
used headphone will stand the high output power without get-
ting destroyed. The audio signal is held at a low volume until
the gain is set to -15 dB or below. The Volume knob is active
on the current phones output and can be used to turn down the
volume. Once -15 dB is reached the volume is ramped up to
the current gain.
Pressing encoder 1 removes the message immediately, with volume ramped up within 2 seconds
to the set value.
The message will also vanish when the phone is unplugged again.
This message is not shown when Volume is set to -15 dB or lower, or when the device is switched
on while the phones are already connected.
Dual Phones Mode required
Phones output PH 1/2 is considered an additional output for two
specific cases: usage of two headphones and balanced phones
operation. Therefore plugging in phones into output PH 1/2
brings up a warning that this output is coupled to the rear out-
puts, and should only be used if required.
PH 1/2 stays deactivated until Dual Phones mode has been ac-
tivated via SETUP.
Overload / Short detected
An internal overload can be caused by too high output levels
and too low load impedance. A short circuit in the TRS plug will
also trigger the overload detection. In such a case the relay will
permanently disconnect the phone from the Extreme Power
output stage. If the phones plug is removed and plugged in
again after one second, the unit will activate the phones output
again.
This scheme has been introduced to force the user to check
cabling and connection. For example, a TRS plug not fully in-
serted might stay unnoticed but can cause a short circuit.
DC detected (Hardware)
DC detection is crucial to prevent the sensitive phones drivers
from being destroyed by inaudible currents flowing through
them. As the ADI-2/4 Pro SE is fully DC coupled from DAC to
phones output, a digital full scale signal with 0 Hz would pro-
duce up to 15V DC at the outputs, and destroy any attached
phone immediately. In case the power output stage fails the
same could happen. Therefore the phones outputs will switch
off with 1.4V DC detected.
User's Guide ADI-2/4 Pro SE – v 1.0
37
Advertisement
Table of Contents
