Ecler eHSA SERIES User manual

eHSA SERIES
HIGH IMPEDANCE AMPLIFIERS
Multichannel Amplifier
USER MANUAL

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INDEX
1. IMPORTANT REMARK.................................................................................... 3
2. IMPORTANT SAFETY INSTRUCTIONS .............................................................. 3
3. IMPORTANT NOTE......................................................................................... 5
4. INTRODUCTION ............................................................................................. 5
4.1 Main features.................................................................................................. 5
5. INSTALLATION............................................................................................... 6
5.1 Placement, mounting, cooling ........................................................................ 6
5.2 Mains connection............................................................................................ 6
5.3 Input signal connections ................................................................................. 6
5.4 Power saving mode......................................................................................... 7
5.5 Limiter circuit .................................................................................................. 7
5.6 Output connections......................................................................................... 7
6. OPERATION AND USAGE................................................................................7
6.1 Start up ........................................................................................................... 7
6.2 Input attenuators............................................................................................ 8
6.3 Indicators ........................................................................................................ 8
7. CLEANING...................................................................................................... 8
8. FUNCTION DIAGRAM..................................................................................... 9
9. FUNCTION LIST .............................................................................................. 9
10. TECHNICAL CHARACTERISTICS...................................................................... 10
11. BLOCK DIAGRAM......................................................................................... 11

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1. IMPORTANT REMARK
The lightning flash with arrowhead symbol, within an equilateral
triangle, is intended to alert the user to the presence of uninsulated
“dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert
the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
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-outlet with a protective earthing connection.
2. IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.

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9. Do not defeat the safety purpose of the polarized or grounding type plug. A
polarized plug has two blades with one wider than the other. A grounding
type plug has two blades and a third grounding prong. The wide blade or
the third prong are provided for your safety. If the provided plug does not
fit into your outlet, consult an electrician for replacement of the obsolete
outlet.
10. Protect the power cord from being walked on or pinched particularly at the
plugs, convenience receptacles, and at the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug the apparatus during lightening sorts or when unused for long
periods of time.
13. Refer all servicing to qualified personnel. Servicing is required when the
apparatus has been damaged in any way, such as power supply cord or plug
is damaged, liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate
normally, or has been dropped.
14. Disconnecting from mains: Switching off the POWER switch all the
functions and light indicators of the amplifier 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 splashing and that no
objects filled with liquids, such as vases, shall be placed on apparatus.
NOTE: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his
own expense.
WARNING: This product must not be discarded, under any circumstance,
as unsorted urban waste. Take to the nearest electrical and electronic
waste treatment centre.
NEEC AUDIO BARCELONA, S.L. accepts no liability for any damage that may be
caused to people, animal or objects due to failure to comply with the warnings
above.

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3. 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 eHSA.
In order to obtain maximum operability 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
4. INTRODUCTION
The Ecler Essentials eHSA amplifier series offers the renowned professional
reliability of Ecler amplifiers at an affordable price. It consists of 2 models: one
with a power of 2 x 150W RMS @ 70/100V, high impedance (eHSA2-150) and a
second one with a power of 4 x 150W RMS 70/100V, high impedance (eHSA4-
150). All models use very high-performance technology, auto standby and
convection cooling, with a height of 1 rack unit.
Equipped with balanced inputs on Euroblock connectors. Outputs also feature
Euroblock connectors. It has an electronic limitation system to avoid signal
saturation and a thermal protection, as well as a protection system against
overload.
4.1 Main features
Easily accessible input attenuation controls on the front panel.
Switchable auto standby circuit (energy saving mode when there is no input signal)
Signal presence (SP), clipping (CLIP), protection against overload (PROT) and
thermal protection (TH) indicators.
Built-in, always active anticlip circuit
Operating mode selector: STEREO, MONO
Balanced inputs on Euroblock connectors
Outputs on Euroblock connectors
Accepts high impedance loads on 70/100V line

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5. INSTALLATION
5.1 Placement, mounting, cooling
All eHSA amplifiers are presented in standard 19” rack format and are 1 unit high.
It is important that the amplifier, as a heat source, is not placed next to other
equipment nor exposed to high temperatures.
CAUTION: The built-in convection cooling requires at least one free rack unit
(empty space) both above and below each amplifier to ensure a correct air flow.
It is also advisable not to rack the power amplifiers under other devices, but on top
of these, that is to say as high as possible toward the top of the rack cabinet.
5.2 Mains connection
The eHSA amplifiers are powered by 100 to 250VAC, 50/60Hz.
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, it is protected by a set of fuses. Should a fuse blow, it must be replaced
immediately by one with identical rating. Should it blow again please contact our
Technical Service Department. NEVER REPLACE THE FUSE WITH ANOTHER ONE
WITH A HIGHER VALUE.
CAUTION: Fuse substitutions have to be performed by a qualified
technician.
5.3 Input signal connections
The signal input connectors are of EUROBLOCK (12, 13) and electronically
balanced. The pin assignment is as follows:
Hot or direct signal > +
Cold or phase inverted signal > -
Ground > Ground
For unbalanced connections, ground the negative terminal on the Euroblock.
In balanced mode, the input impedance is greater than 20k (10kunbalanced), allowing
you to connect a large number of stages in parallel without compromising the sound quality.

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5.4 Power saving mode
The AUTO STBY (10) switch allows to activate the automatic switching circuit calling the
power saving mode (low power consumption) when it detects no audio signal from the
unit's inputs during more than 90 seconds, and automatically recovering normal operation
when that signal reappears
5.5 Limiter circuit
This is an extra protection always enabled in the eHSA series amplifiers. This circuit
dynamically limits the input signal to avoid clipping of loud signals at the amplifier output; it
automatically reduces the input level not to exceed approximately 5% distortion.
The great utility of this circuit in any type of installation should be noted; the advantage of
this system over traditional compressors is that dynamics is practically not altered, due to
its time constant.
5.6 Output connections
The output section on the rear panel features Euroblock connectors (15, 16).
The loudspeakers line has to be connected to the amplifier’s 0V and 70V terminals (70V line)
or 0V and 100V terminals (100V line).
In STEREO mode, each channel takes the signal from its corresponding input (OUTPUT CH1
from INPUT CH1, OUTPUT CH2 from INPUT CH2 etc.). In MONO mode, the signal is taken
from the odd input only.
The connection cable that joins the amplifiers outputs and the loudspeakers must
be of good quality, sufficient section and as short as possible. This is most
important when the distances to cover are long ones.
6. OPERATION AND USAGE
6.1 Start up
The red "PROT" LEDs (7) light up when you turn on the power switch (11). A
second after all voltages have been stabilized and the amplifier is operating,
"PROT" indicators turn off.
In a complete audio installation, it is important to power on the equipment
according to the following sequence: sound sources (microphones, music players,
etc.), mixers, equalizers, active filters and power amplifiers. To power off, follow
the reverse sequence.

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6.2 Input attenuators
This consists of rotating potentiometers, situated on the front panel (5, 6).
These attenuators allow connecting the amplifier to different types of mixers and
processors, independent level control and connection of speakers that can't handle the
wattage supplied by the output stage at full power, without risking damage if the volume of
the preamplifier-mixer is set too high.
6.3 Indicators
eHSA amplifiers include a simple yet effective indication system.
PROT/STBY indicators (7) show the absence of loudspeaker output signal. These
indicators may light up for following reasons:
During start-up, until the STANDBY time has passed. This time period is
needed for the internal operating voltages to settle.
A short circuit is detected at the loudspeaker terminals (PROTECT function).
When the module enters AUTO-STANDBY mode. In this case, the indicator will
illuminate in orange instead of red.
If these indicators remain lit in red, there's a malfunction that should be investigated to find
the cause of this lighting.
CLIP (2, 4) indicators light up when the signal level feeding the loudspeakers is just
below the actual clipping. This CLIP system takes into account possible variations
in the supply voltage, always giving a real indication. CLIP indicators light up to the
beat of low frequencies when working at high power levels ; it's normal as low
frequencies are those with higher energy content. You must take care that these
indicators do not remain continuously lit.
SP Signal Presence indicators (1, 3) indicate the presence of a valid signal at the amplifier
inputs.
The TH (THERMAL) (8) indicator lights when the unit has entered the protection mode due
to excessive temperature; normal operation is recovered when the amplifier internal
temperature comes back down to regular operating levels.
7. CLEANING
The front panel should not be cleaned with dissolvent or abrasive substances
because silk-printing could be damaged. To clean it, use a soft cloth slightly wet
with water and neutral liquid soap; dry it with a clean cloth. Be careful that water
never gets into the amplifier through the holes of the front panel.

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8. FUNCTION DIAGRAM
9. FUNCTION LIST
1. SP, signal presence indicator at the CH 1 input
2. CLIP, clipping indicator for CH 1
3. SP, signal presence indicator at the CH 2 input
4. CLIP, clipping indicator for CH 2
5. CH 1 input attenuator
6. CH 2 input attenuator
7. PROT/STBY, overload protection and Standby status indicator
8. TH, thermal protection indicator
9. ON power indicator
10. AUTO STANDBY switch
11. Power switch
12. CH 1, input 1 Euroblock connector
13. CH 2, input 2 Euroblock connector
14. STEREO, MONO selector
15. CH 1, output 1 Euroblock connector (70/100V)
16. CH 2, output 2 Euroblock connector (70/100V)
17. AC socket connector
NOTE: Listed functions are for two-channel models; for models with more than two
channels, the number of these functions matches the number of amplifier channels.

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10. TECHNICAL CHARACTERISTICS
eHSA2-150
eHSA4-150
POWER @ 1KHz 1% THD
100V output
1 Channel @ 66
145 WRMS
145 WRMS
All Channels @ 66
142 WRMS
140 WRMS
Frequency response (-1dB, -3dB)
20Hz - 30kHz
20Hz -30kHz
Filter (High-Pass) 3rd order
Butterworth
50Hz
50Hz
THD+Noise @ 1kHz Full Pwr.
<0.05%
<0.05%
S+N/N 20Hz - 20kHz @ 1W/4
>85dB
>85dB
CMRR
>55dB
>55dB
Damping factor 1kHz @ 8
>150
>150
Channel crosstalk @ 1kHz
>55dB
>55dB
Input Sensitivity / Impedance
0dBV/>20k
0dBV/>20k
Anti-clip @ 2dBV input
<1% THD
<1% THD
Mains Voltage
See characteristics in the back of the unit.
Power consumption
(pink noise, 1/8 power @ 4)
63W / 74VA
113W / 130VA
Power consumption
(pink noise, 1/3 power @ 4)
139W
268W
Power consumption (Idle)
19W
29W
Power consumption (STBY)
13W
18W
Efficiency @ Pmax
77%
80%
Dimensions WxHxD
(Handle excluded)
440x44x221mm
440x44x341mm
Weight
6.05kg
10.5kg

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11. BLOCK DIAGRAM
eHSA2-150

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eHSA4-150

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All product characteristics are subject to variation due 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 ‐ ([phone] infor[email protected] www.ecler.com