Ecler eHSA2-250 User manual

eHSA2-250 / eHSA2-500
eHSA4-250 / eHSA4-500
HIGH IMPEDANCE AMPLIFIERS
Multichanel amplifiers
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 High-pass filter ..........................................................................................................7
5.5 Output connections ...................................................................................................7
6. OPERATION AND USAGE ........................................................................................ 7
6.1 Start up......................................................................................................................7
6.2 Input attenuators ......................................................................................................7
6.3 Indicators...................................................................................................................8
7. CLEANING .............................................................................................................. 8
8. FUNCTION DIAGRAM ............................................................................................. 9
9. FUNCTION LIST....................................................................................................... 9
10. TECHNICAL CHARACTERISTICS .............................................................................. 10
11. BLOCK DIAGRAM.................................................................................................. 11
11.1 eHSA2-250.............................................................................................................11
11.2. eHSA2-500............................................................................................................12
11.3. eHSA4-250............................................................................................................13
11.4. eHSA4-500............................................................................................................14

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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 (If applicable): The terminals marked 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-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.

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8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
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 high impedance amplifier series offers the renowned
professional reliability of Ecler amplifiers at an affordable price.
The models covered by this manual are:
eHSA2-250: 2 x 250W RMS @ 100V
eHSA2-500: 2 x 500W RMS @ 100V
eHSA4-250: 4 x 250W RMS @ 100V
eHSA4-500: 4 x 500W RMS @ 100V
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 and DC OUT protection, as well as a protection
system against overload.
4.1 Main features
Easily accessible input attenuation controls on the rear panel.
Signal presence (SP), clipping (CLIP), protection against overload (PROT) and
thermal protection (TH) indicators.
Built-in, always active anticlip circuit
Switchable high-pass filter, type 3rd order Butterworth, 75 Hz
Balanced inputs on Euroblock connectors
Outputs on Euroblock connectors
Accepts high impedance loads on 100V line

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5. INSTALLATION
5.1 Placement, mounting, cooling
All eHSA2-250, 2-500, 4-250 y 4-500 amplifiers are presented in standard 19” rack
format and are 2 units high.
It is important that the amplifier, as a heat source, is not placed next to other
equipment nor exposed to high temperatures.
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 115 to 230VAC, 50/60Hz. (by voltage selector
on the rear panel, MAINS SELECTOR)
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. If it blows 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 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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Each input connector (INPUT CH1, INPUT CH2, etc., depending on the model) has an
adjacent STACK link connector (same signal available in INPUT), enabled to connect
the same input signal to several inputs or devices.
5.4 High-pass filter
Each input channel has a switch which activates (ON) or deactivates (OFF) its high
pass filter: 3rd order Butterworth with cut-off frequency at 75 Hz.
5.5 Output connections
The 100V OUTPUTS section on the rear panel features Euroblock connectors.
The loudspeakers line has to be connected to the amplifier’s + and - terminals from
each output channel.
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 light up when you turn on the POWER switch. A moment later
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.
6.2 Input attenuators
These consists of rotating potentiometers (VOL), situated on the rear panel, one for
each channel.
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.

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6.3 Indicators
eHSA amplifiers include a simple yet effective indication system.
PROT indicators show the absence of loudspeaker output signal. These indicators
may light up for following reasons:
During start-up, until the boot time 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).
If these indicators remain lit in red, there's a malfunction that should be investigated
to find the cause of this lighting.
CLIP 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 indicate the presence of a valid signal at the amplifier
inputs.
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. Channel Vumeter LED indicators
2. ON power indicator
3. Power switch
4. AC socket connector
5. Fuse holder
6. 230V / 115V selector
7. Channel outputs Euroblock connectors (100V)
8. High pass filter switch
9. Channel input attenuators
10. Channel input Euroblock connectors
11. Channel stack Euroblock connectors
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
eHSA2-250
eHSA2-500
eHSA4-250
eHSA4-500
POWER @ 1kHz 1% THD, 100V output
1 Channel @ 100V Line
250 WRMS
500 WRMS
250 WRMS
500 WRMS
All Channels @ 100V Line
250 WRMS
500 WRMS
250 WRMS
450 WRMS
Frequency response (-3 dB, -3dB)
40Hz - 20kHz
40Hz - 20kHz
40Hz - 20kHz
40Hz - 20kHz
Filter (High-Pass) 3rd order Butterworth
75Hz
75Hz
75Hz
75Hz
THD+Noise @ 1kHz Full Power
<0.05%
<0.05%
<0.05%
<0.05%
S+N/N 20Hz - 20kHz
>80dB
>80dB
>80dB
>80dB
CMRR
>55dB
>55dB
>55dB
>55dB
Channel crosstalk @ 1kHz
>55dB
>55dB
>55dB
>55dB
Input Sensitivity / Impedance
0dB/>20kΩ
0dB/>20kΩ
0dB/>20kΩ
0dB/>20kΩ
Mains voltage
See characteristics in the back of the unit.
Power consumption
pink noise, 1/8 power
125W
195W
210W
380W
pink noise, 1/3 power
270W
425W
450W
860W
Idle
40W
40W
65W
65W
Dimensions (Handle excluded)
482,6x88x365mm
482,6x88x365mm
482,6x88x373mm
482,6x88x365mm
Weight
6,2 kg
6,3 kg
7,0 kg
7,6 kg

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11. BLOCK DIAGRAM
11.1 eHSA2-250

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11.2. eHSA2-500

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11.3. eHSA4-250

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11.4. eHSA4-500

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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] [email protected] www.ecler.com