Phonic ICON300, User Manual

Page: 7 / 24

ICON 300/00
100 volt line output connection
Bridge Mono Configuration for Audio Transformer Outputs
1. For driving 140V or 200V distributed lines, the amplifier must
be set into bridge mono mode.
2. Connect the signal to channel 1's input only. Do not
connect an input signal to channel 2.
3. Use only channel 1's gain control to set the level. Both
channels signal and clip indicators should flash identically
when the amplifier is operating.
140 volt line output connection,
bridge mono mode
200 volt line output connection,
bridge mono mode
Parallel Mono Configuration
The "Parallel mode" ties the two channel inputs together so
that both are driven by the same signal, without the need for
external jumpers or wiring. After the inputs, both channels
operate independently. Though they carry the same signal, their
gain controls affect only their respective channels, which must
be used separately. Please refer to the previous Rear Panel
Description. Never parallel the speaker outputs.
Low-Impedance and Distributed Speakers on Icon
Amplifiers
If your application calls for connection of an 8 ohm speaker and
a distributed line to the same amplifier channel, the Icon 300
and Icon 700 are among the very few amplifiers that can do
that. However, since most of the audio power is drawn by the
direct-connected speaker, you must derate the distributed line;
and the distributed line should have a total power load of no
more than one-fourth of the amplifiers normal distributed line
power rating.

Computing maximum allowable distributed line load with a
known low-impedance load
MaxTOP = [MaxRatedPL - ((2 x MaxRatedPL)/Impedance)]/2
MaxTOP is the sum of the power taps of the speakers connected
to the Audio Transformer outputs.
MaxRatedPL is the maximum rated power of the amplifier into
a two ohm load.
Impedance is the load impedance connected to the direct
outputs.
Example: One channel of an Icon 700 has an 8-ohm load
connected to the Direct (low impedance) output. Then the
maximum power left available to drive a distributed line is:
MaxTOP = [550-((2x550/8)/2)] = 206 Watts