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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 DPA 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.
DPA series amplifiers come with a 3-year warranty.
1.1.
Precautions
The DPA600/1000/1400/2000 consumes a maximum power of 830VA / 1250VA / 1720VA / 3115VA, we
therefore recommend a mains wire not inferior to 2,5mm
2
and a (circuit breaker) superior to 10A/220VAC
(15A/220VAC DPA2000) (data for one amplifier).
The amplifier should have an earth connection in good conditions (earth resistance, Rg=30
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 grilles 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 up to 400Vpp. The output cabling should be connected by a qualified technician. Otherwise only use pre-
made flexible cables. There are no user 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 controlled 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 DPA power amplifier line is yet another step forward in the evolution of the SPM technology.
DPA amplifiers introduce innovations which probably make them one of the most reliable amplification lines
of its class.
SOA Contour following protection
The SOA is the safe operating area of transistors. A good protection system should respect this area and
its shiftings, as the SOA changes as a function of the operating temperature. So, at 80°C it is considerably
narrower than a 25°C, the start-up temperature. Some manufacturers decide to use protection systems which
compromise on the performance of the components. You get a fair protection, but the performance remains
mediocre. Others prefer to leave "dark" areas between the safe operating area and the activation of protection,
which is very risky indeed.
The new SOA contour following protection systems built into the DPA amplifiers guarantees total protection
of the amplifier at any output power, load or operating temperature, as the intelligent electronic circuitry
permanently watches for changes in the safety area, adapting itself to any situation.
The best Damping in an amplifier of its class. In the DPA series, the typical output relays have been
substituted with an electronic CROW BAR system. This device shunts to ground any signal in case of high voltages
which could damage the connected speakers. Any kind of relay introduces a mechanical contact in the path of the
audio signal to the loudspeakers. This contact implies a certain degree of wearing and an important reduction of the
amplifier's damping factor.