Ecler PAM1100 User Manual

Contents

Ecler PAM1100 User Manual Manual pdf 9 page image

94.3.a) Signal presence indicators “SIGNAL” (5)They show the presence of a signal at the amplifier inputs. They shine when the inputlevel is greater than -40dBV.4.3.b) Protection indicators “PROTECT” (3)Besides lighting up during stand-by mode (when switching on the unit), theseindicators will light up for following reasons:1- Because there is a short-circuit at the amplifier output. In case of a permanentshort-circuit, the protections will disconnect the amplifier in less than 70μs (Models 1100 and2100); models 4100 and 6100 continuously protect and disconnect in 15s. The protectionsalso become active when there exists an excessive high frequency clipping, thus protecting thetweeters2- If the amplifier is supplying DC signal or very low frequencies that could damagethe loudspeaker. The protections detect frequencies under 4Hz. A CROW BAR system is usedto separate the loudspeakers from the output terminals.If the indicators are permanently lit, this is a symptom of malfunction and the causeshould be investigated.The Autoreset system will cyclically restart the amplifier after about 15-18 seconds.If the problem still persists, please consult our Technical Services.4.3.c) Clipping indicators "CLIP" (2)They will shine when the output signal is 0.3dB under the true clipping. This systemtakes into account the possible changes of the mains supply and always gives a true measureindependently of the mains voltage. It is usual that the CLIP indicators shine following the bassfrequencies when the amplifier operates at high power levels. Take care that the CLIP indicatorsare not permanently lit.4.3.d) “MONO BRIDGED” indicator (6)It shines when the back panel “STEREO BRIDGE” switch is placed on the BRIDGEposition.4.3.e) Thermal protection indicator “THERMAL” (4)It shines when the cooling tunnel temperature reaches 90ºC. The amplifier willautomatically restart when the temperature lessens to 80ºC.4.4. Operation at 2ΩOperation at 2Ω considerably reduces the sound quality and the system efficiency; e.g.,the loss on the loudspeaker cable reduces the Damping Factor by a 76% because of operating at2Ω instead of 8Ω.