User`s guide

23
3.6.- HEAT EMISSION
Use the table below to predict the heat emission from your ampli-
fier, which can be useful to evaluate air conditioning requirements.
They are given in BTU (British Thermal Unit) and calories.
4. OPERATION
SWITCH ON/OFF
Switch your sound system on from back to front. Thus, switch on
the amplifiers last on your sound system. Switch sound sources
(CDs, turntables) first, then your mixer, then your processors and
crossovers and finally the amplifiers. If you have more than one
amplifier, switch them on sequentially, one at a time.
Follow the reverse order when switching off, and switch off the
amplifiers before any other element on your sound system.
CLIP LED
The red LED light should never be on continuously. This will distort
the signal and may damage the speakers. In fact, severe clipping is
an easy way of burning a speaker's voice coil. At most, the clip light
could be lit occasionally.
Additionally, models E-2 and E-4 feature an automatic limiting
system that impedes prolonged saturation (clip), therefore
protecting the speakers from one of the most common failure types.
LEVEL CONTROLS
The INPUT LEVEL rotary potentiometer is used for changing the
input gain. Although related to output power, it is not a direct
representation of it. Thus, we can have maximum output power
with the gain at mid position. Similarly, we may
have the gain controls at maximum and not
have maximum output if our source signal is not
hot enough.
One way to use the volume controls is to set
them such that when the mixer's faders are at
their maximum level, we are just below clipping
level on the amplifier or clipping very
occasionally.
INPUTS - XLR and 1/4” PHONE (commonly referred to as "jack")
Both connectors are in parallel so any of them can be used to feed
signal to an amplifier channel. Although unbalanced signals can be
used, we recommend the use of balanced connections for the
greater immunity to interfering noise. XLR is normally preferred to
1/4” phone since it has a locking mechanism that avoids accidental
disconnection.
Since they are in parallel, they can be used to feed the signal to
another amplifier. For example, one could plug into channel A's XLR
connector, and use the 1/4” ("jack") connector of the same channel
to feed another amplifier with the same signal.
The graphs that follow show the recommended connection from
different connector types. The connectors on the left hand side plug
into the sound sources such as mixers, and the connectors on the
right plug into the amplifier's input connectors. Note that
unbalanced to balanced connections have two terminals joined
together (- and ground). When using balanced to balanced
connections, try lifting ground on the input connector if hum is
present in the system.
HIGH PERFORMANCE POWER AMPLIFIERS
MODEL
CARGA Max. POWER 1/3 POWER 1/8 POWERA IDLE
BTU/h Kcal/h BTU/h Kcal/h BTU/h Kcal/h BTU/h Kcal/h
8 + 8 ohms 485 120 500 125 395 100 155 40
4 + 4 ohms 790 200 735 185 600 150 155 40
8 + 8 ohms 865 220 815 205 645 165 315 80
4 + 4 ohms 1440 365 1370 345 1060 265 315 80
8 + 8 ohms 810 205 355 90 140 35 235 60
4 + 4 ohms 1320 330 320 80 165 40 235 60
Bridge 8 ohms 1380 350 445 110 210 55 235 60
8 + 8 ohms 1280 325 565 145 230 60 315 80
4 + 4 ohms 1600 405 420 105 150 40 315 80
Bridge 8 ohms 1795 450 510 130 185 45 315 80
8 + 8 ohms 3740 940 1995 505 1130 285 315 80
4 + 4 ohms 5815 1465 2325 585 1305 330 315 80
Bridge 8 ohms 5710 1440 2215 560 1260 320 315 80
Fig.3.7
E - 2
E - 4
E - 8
E - 12
E - 20
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