Phonic MAX 250 User manual

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MAX250 USER’S MANUAL PHONIC CORPORATIONPage 6
Connect your source to either the XLR or 1/4"
phone jack, which are commonly used for both
mobile and istallation set-ups. They provide a
good combination of ease of connection and
resistance to corrosion. The XLR inputs are
wired as the following convention:
5 CH1/CH2 INPUT
BACK PANEL
7 GROUND LIFT SWITCH
This switch allows the circuit and chassis
grounds to be separated in case on a ground
conflict. In normal use, the switch should be
in the
“ grounding ” position.
Lifting the ground ( “ floating ” position) may
resolve the ground conflict which means that
circuit grounding depends on the connected
components. Deficiencies in other compo-
nents
’ grounding will affect the sound and a
serious electric fault with the amplifier could
damage the components in the system.
For the best combination of safety and
performance, it is highly recommended
to always keep the switch at the
“ Ground-
ing
” position.
1/4" phone jacks feature on much audio equip-
ment and are convenient if the amp is fre-
quently connected and disconnected, such as
for mobile set-up. The plugs used should be
wired as the following convention:
BACK PANEL
6 STEREO/ PARALLEL SWITCH
In stereo operation, two separate signals are
driven separately by channels 1 and 2 of MAX
250.
8 BINDING POST OUTPUT CH1/CH2
These are suitable for banana plugs, spade
lugs or bare wires. Spade lugs and bare wires
should both be screwed tightly to exclude
oxygen, and care should be taken to avoid
loose strands of wire that may cause short
circuits.
In parallel operation, one signal is driven by
both channel 1 and 2 of MAX 250. In other
words, a signal connected to input CH1 or CH2
is sent to both output CH1 and CH2.
This switch should be used when the ampli-
fier is off; otherwise, the speakers
’ compo-
nents could be damaged.

MAX250 USER’S MANUALPHONIC CORPORATION Page 7
HOOK-UP #1 STUDIO MONITOR AMP/SOUND REINFORCEMENT
MAX 250 is ideal for driving near-field or other reference speakers. For auditorium and live music
setup, MAX 250 has sufficient power to drive a set of small-to-medium size club speakers.

MAX250 USER’S MANUAL PHONIC CORPORATIONPage 8
HOOK-UP #2 BI-AMP SOUND REINFORCEMENT
Bi-amplification often provides better live sound and greater efficiency by splitting the audio signal
into two different channels. It is best illustrated when you are using an active crossover(eg. PCR2213)
and two full-range speakers that featured with bi-amp operation mode (eg. ES152). Use the smaller
amplifier (eg. MAX250) to drive the two tweeters and the bigger amplifier (eg. MAX860) to drive the
two woofers.

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