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The AUTO STBY function operation is the following: 

AUTO STBY button 

JUMPER MJ102 

Operation 

On 

Factory defaults position  Energy Star autostby 

On 

User position 

Amplifier autostby 

Off 

Factory defaults position  Disabled 

Off 

User position 

Disabled 

 

The  jumper,  is  in  the  FACTORY  DEFAULTS  position  by  default  (see  chapter 
Configuration diagram), so when activating the AUTO STBY button, the ENERGY STAR 
AUTO  STBY  will  be  enabled.  If  you  want  to  change  the  position  of  the  jumper  (user 
position), check the configuration diagram and contact qualified personnel. 

5.5. Limiter circuit 

This  system  is  an  always  active  protection  inside  the  GPA2-400ES  of amplifiers.  The 
ANTICLIP circuitry constantly analyses harmonic distortion caused by excessive signal 
excursion at the power amplifier's output and automatically reduces the input level in 
order never to exceed 5% total harmonic distortion. 

The great convenience of such a circuit in any kind of installation has to be remarked: 
The clear advantage of a limiting system in front of conventional compressors is that the 
former  does  practically  not  alter  the  dynamic  range,  acting  only  when  the  distortion 
threshold is reached. 

5.6. Output connections 

The output section on the rear panel features both Speakon® connectors and Euroblock 
connectors. 

In STEREO mode, each channel takes the signal from its corresponding input (OUTPUT 
CH1 from INPUT CH1 and OUTPUT CH2 from INPUT CH2). In MONO/BRIDGE mode, 
the signal is taken from INPUT CH1 only. 

If  you  need  to  operate  the  amplifier  in  BRIDGED  mode,  you  should  place  the 
“ST/MONO” switch in MONO position. The input signal connection is performed using 
the channel 1 connector and the speaker output using the "CH1" Speakon

 terminals 

1+ and 2- and/or BRIDGE labelled terminals on the Euroblock output connector. 

Summary of Contents for GPA2-400ES

Page 1: ...GPA2 400ES AMPLIFIERS Stereo High efficiency Amplifier USER MANUAL ...

Page 2: ... connection 6 5 3 Input signal connections 7 5 4 Subsonic filter and Power saving mode 7 5 5 Limiter circuit 8 5 6 Output connections 8 6 OPERATION AND USAGE 9 6 1 Start up 9 6 2 Input attenuators 9 6 3 Indicators 10 7 CLEANING 10 8 FUNCTION DIAGRAM 11 9 FUNCTION LIST 11 10 TECHNICAL CHARACTERISTICS 11 11 BLOCK DIAGRAM 13 12 DIAGRAMA DE CONFIGURACIÓN Error Marcador no definido ...

Page 3: ...rked with symbol of may be of sufficient magnitude to constitute a risk of electric shock The external wiring connected to the terminals requires installation by an instructed person or the use of ready made leads or cords WARNING To prevent fire or shock hazard do not expose this equipment to rain or moisture WARNING An apparatus with Class I construction shall be connected to a mains socket outl...

Page 4: ...ifier will be stopped but fully disconnecting the device from mains is done unplugging the power cord from the mains input socket For this reason it always shall remain readily operable 15 Equipment is connected to a socket outlet with earthing connection by means of a power cord 16 The marking information is located at the bottom of apparatus 17 The apparatus shall not be exposed to dripping or s...

Page 5: ...dby function and convection cooling with height of 2 rack units Equipped with balanced inputs XLR3 and Euroblock connectors its outputs offer total versatility with Euroblock connectors and Speakon connectors It has an electronic limitation system to avoid signal saturation as well as a thermal protection 4 1 Main features Easily accessible input attenuation controls on the front panel may be lock...

Page 6: ...toward the top of the rack cabinet 5 2 Mains connection The GPA2 400ES amplifiers are fed with alternate currents depending on the country of 110 120 220 240V 47 63Hz see characteristics in the back of the unit The mains cables must not be near the shielded cables carrying the audio signal as this could cause humming In order to protect the power amplifier from eventual power consumption overloads...

Page 7: ...components which once amplified would suppose a risk of damage to the low frequency speakers as the woofer s diaphragm would be damaged due to these low frequencies The filter of the GPA2 400ES which has a Butterworth shaped response with 18 dB oct slope has a cut off frequency of 50 Hz and can be switched on or off via a switch on the rear panel The AUTO STBY switch allows to activate the automat...

Page 8: ...omatically reduces the input level in order never to exceed 5 total harmonic distortion The great convenience of such a circuit in any kind of installation has to be remarked The clear advantage of a limiting system in front of conventional compressors is that the former does practically not alter the dynamic range acting only when the distortion threshold is reached 5 6 Output connections The out...

Page 9: ... turn off meaning that the amplifier is now operative In a complete audio installation it is important to start up the equipment in the following sequence sound sources mixer equalizers active filters and finally power amplifiers To turn them off the sequence should follow an inverse pattern 6 2 Input attenuators This consists of rotary potentiometers situated on the front panel These attenuators ...

Page 10: ... supply voltage oscillations so that a dependable clip reading is achieved even when operating with unstable mains voltage It is usual that the CLIP STBY indicators shine following the bass frequencies when the amplifier operates at high power levels as these frequencies carry the main energy Take care that the CLIP STBY indicators are not permanently lit SP Signal Presence indicators indicate the...

Page 11: ...o standby indicator 9 Power switch 10 Mains socket 11 Fuse holder 12 Auto standby switch 13 Screwable terminal for remote control CH 1 CH 2 14 XLR input connector CH 2 15 Input screwable terminal CH 2 16 STEREO MONO switch 17 Input screwable terminal CH 1 18 XLR input connector CH 1 19 High pass filter switch HP FILTER 20 Speakon connectors to the loudspeakers CH 2 21 Output screwable terminal CH ...

Page 12: ...z 7kHz 4 1 0 06 TIM 100 0 04 S N N 20Hz 20kHz 1W 4 85dB CMRR 55dB Damping factor 1kHz 8 360 Channel crosstalk 1kHz 55dB Input Sensitivity Impedance 0dBV 20k Anticlip 2dBV input 5 THD Mains Voltage See characteristics in the back of the unit Power consumption pink noise 1 8 power 4ohm 143W 204VA Power consumption pink noise 1 3 power 4ohm 334W Power consumption Idle 25W Power consumption STBY 17W E...

Page 13: ...13 11 BLOCK DIAGRAM ...

Page 14: ...14 12 CONFIGURATION DIAGRAM ...

Page 15: ...to production tolerances NEEC AUDIO BARCELONA S L reserves the right to make changes or improvements in the design or manufacturing that may affect these product specifications Motors 166 168 08038 Barcelona Spain 34 932238403 information ecler com www ecler com ...

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