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1. IMPORTANT NOTE
Congratulations! You are the owner of a carefully designed and manufactured
equipment. We thank you for trusting on us and choosing our amplifier APA SPM (All purpose)
(Switching Power Mosfet).
In order to obtain maximum operativity and perfect functioning order, it is most
important to carefully read all considerations taken into account in this manual before connecting
this amplifier.
We recommend our authorised Technical Services if any maintenance task should be
needed so that optimum operation shall be achieved.
1.1. Precautions
The APA600/1000/1400 consumes a maximum power of 830VA / 1250VA / 1720VA,
we therefore recommend a mains wire not inferior to 1,5mm
2
and a (circuit breaker) superior to
10A/220VAC (data for one amplifier).
The amplifier should have an earth connection in good conditions (earth resistance,
Rg=30
Ω
or less). The environment must be dry and dustless. Do not expose the unit to rain or
water splashes, and do not place liquid containers or incandescent objects like candles on top
of the unit. Do not obstruct the ventilation shafts with any kind of material.
In case there is some type of intervention and/or connection-disconnection of the
amplifier, it is most important to previously disconnect the mains power supply.
Do not manipulate the output terminals to the loudspeakers when the amplifier is
switched on, there are voltages present of more than 400Vpp in the APA1400. The output
cabling should be connected by a qualified technician. Otherwise only use pre-made flexible
cables. There are no user or serviceable parts inside the amplifier.
2. INTRODUCTION
With the PAM amplification series, ECLER introduced a new concept to the world of
professional audio: The use of switching field effect transistors. The integration of these parts
for audio applications represents a firm and spectacular enhancement comparing to
conventional amplifiers. These advantages can be outlined as follows:
a) Lower internal resistance than bipolar transistors, which leads to less heating of the
amplifier and more powerful and controllable bass.
Conventional Mosfets have a 4 to 7 times higher internal resistance than switching
Mosfets.
b) The extremely high speed of these devices gives a transparency to the upper
frequencies till now only achieved by tube amplifiers. This fact also reduces TIM (transitory
intermodulation) to very low levels.
The SPM-Technology (Switching Power Mosfet) has been developed and patented by
ECLER Laboratorio de Electro-Acústica, S.A.
The APA power amplifier line is yet another step forward in the evolution of the SPM
technology.
APA amplifiers introduce innovations which probably make them one of the most
reliable amplification lines of its class.
