leema-acoustics Hydra Manuel utilisateur
HANDBOOK
Leema Acoustics Hydra Power Amplifier
HYDRA
Index HYDRA
Index
General Information ..................................................................................................................................... 2
Conformity Statement, Environmental, Made in the UK, Contact Us ........................................................ 2
Introduction .................................................................................................................................................. 3
Safety Advice ................................................................................................................................................ 4
Hydra Overview ............................................................................................................................................. 5
Installation .................................................................................................................................................... 6
Connections ................................................................................................................................................. 7
AV Direct................................................................................................................................................. 7
Multi 1,Multi 2, Pre-Out, Bi-Amp, Loudspeakers ......................................................................................... 9
Controls ................................................................................................................................................... 9-10
Bi-Amp Connection Drawing ....................................................................................................................... 11
Technical Discussion .............................................................................................................................. 12-13
LIPS ........................................................................................................................................................ 14-15
Audio Specifications ................................................................................................................................... 16
1
General
HYDRA
2
Declaration of Conformity
We hereby declare that the product to which this declaration relates, is in conformity with the following standards:
EN60065, EN55013, EN55020, EN61000-3-2, EN61000-3-3. The product design also follows the provisions of 73/23/EEC,
89/336/EEC and 93/68/EEC Directives.
Environmental Issues
Leema operates a 100% recycling program. All waste materials generated as part of the manufacturing process at Leema’s
headquarters are recycled via a licensed specialist company.
Although Leema electronics operate in standby mode as opposed to being fully switched off, the power drain has been
optimised to a negligible level. Contrary to popular audiophile practice, we do not recommend leaving our power amplifiers
permanently powered. All Leema amplifiers have been designed to attain full operational specifications and sound quality
within a few minutes of switch-on.
Made in the UK
Leema products are designed and manufactured in the UK. This includes all metalwork, printed circuit boards and power
transformers.
Contact Us
Leema may be contacted via our website: www.leema-acoustics.com or by telephone: +44 (0)1938-811900
Introduction
Congratulations on your purchase of a Leema Hydra amplifier.
The Leema range of products has been painstakingly engineered in the United Kingdom to offer genuine state-of-the-art
performance.
Partnered with suitable equipment, Leema amplification will provide audio performance far beyond that of their competitors
and will equal or better the performance of products costing many times their purchase price.
A notable feature of all Leema amplification is incredible bass power and control, due to massive current capability, together
with superb clarity and finesse in the upper frequencies with stunning realism in the midband.
Purchasers should read and follow this instruction manual, paying particular attention to the user installation and safety advice
section.
This manual has been written to enable you to achieve the very best performance and maximum listening pleasure from your
investment.
We wish you many years of pleasurable listening... Move Your World!
With best regards
The Leema Team.
Introduction HYDRA
3
Warning
HYDRA
VERY IMPORTANT
Before connecting your new Leema Hydra to the rest of your system, please ensure that the loudspeaker cables are correctly
and firmly attached to the binding posts on the rear of the unit. All required sources and LIPS cables should also be connected
BEFORE inserting the mains power leads to the system and powering for the first time. The Hydra amplifier has no output short
circuit protection since such circuits limit the output current capability of the amplifier and even complex protection circuits have
undesirable and audible side effects. Short circuiting the amplifier with power applied will damage the amplifier and can be
dangerous.
User installation and safety advice
Please ensure that the mains voltage of your new Hydra amplifier is correct for your region. The setting is displayed on a label
below the mains power inlet. The mains voltage setting is not user adjustable, therefore the amplifier must be returned to the
manufacturer if any changes are required.
Ensure the mains supply is switched off at the wall socket, or unplugged before installing or moving the amplifier.
Do not use near water, for example do not place a potted plant on top of the unit or allow drinks to be placed near the unit. If
liquid is spilt in to the cabinet, remove the mains lead from the wall immediately. The amplifier should then be returned to your
dealer for safety testing before re-use. Failure to do so may result in electric shock or even fire! Do not use the amplifier in damp
conditions, e.g. outside of the house.
Keep away from direct sunlight and other heat sources and ensure adequate ventilation around the amplifier to maintain proper
cooling. Units MUST NOT be stacked directly on top of each other.
Avoid touching the amplifier cabinet after prolonged use as the case and heatsinks may become hot to the touch.
4
Never attempt to open the cabinet. There are no user adjustable parts inside and doing so will invalidate the amplifier’s warranty.
In the event of an electrical storm, remove the mains power lead from the wall outlet.
As with all high-powered amplifiers, high voltages can occur at the output binding posts. Loudspeaker connection should only
be carried out with the unit switched off. Care should be taken to ensure there is no possibility of a short circuit behind the unit
when in use, for example, metal framed hi-fi units may be a hazard.
Leema amplifiers do not have any output short circuit protection so extreme care must be taken.
Hydra overview
The Leema Hydra is a very high power output, microprocessor controlled, stereo power amplifier. Thanks to the LIPS (Leema
intelligent protocol system) interface, it can be used to bi-Amplify a Tucana in an audiophile stereo system, act as the power
amplifier in a stereo pre-power combination or become part of a stunning home cinema or surround music system. Each
component in your system will dynamically re-configure in real time depending on your individual system requirements. The
microprocessor control gives an unprecedented degree of sophistication, making the Leema constellation series easy to use for
all the family. No longer will only one member of the family know how to play a CD or watch a movie. The built-in intelligence
learns your preferences without menus and confusing options.
Overview HYDRA
5
Installation
HYDRA
‘LIPS’ bus connectors
This allows communication
between various Leema
system components.
Loudspeaker Outputs
The loudspeakers connect here.
Ensure correct polarity:
Red terminal is +, Black terminal is -.
WARNING:
Do not make connections with unit
connected to the mains supply.
SHORTING THE LOUDSPEAKER
OUTPUTS WILL DAMAGE THE
AMPLIFIER
PRE-AMP Output
This output may be
used for bi-amping or
for bass extraction
when used with a
Leema Corvus.
INPUTS
MULTI 1 and MULTI 2 are
normally used for the surround
channels of multi-channel
sources, e.g. DVD players etc.
AV DIRECT
The AV Direct input is
intended for connection of
an AV processor or similar.
WARNING:
Any source connected
here MUST have it’s own
volume control. When the
AV input is selected, the
volume level is preset. If a
fixed level source is
connected here e.g. a CD
player, the resulting
volume level will be
extremely high.
BI-AMP OUTPUT
This output is a duplicate of the
PRE OUT and is used to feed
another Hydra for BI-AMPING.
Power Inlet
Ensure that the
specification indicated
below the connector is
correct for your area.
This will either be
230VAC or 115VAC.
6
PRECISION AUDIO COMPONENT MANUFACTURED IN THE UNITED KINGDOM BY LEEMA ELECTRO ACOUSTICS LIMITED
NO USER SERVICEABLE PARTS INSIDE
REFER TO QUALIFIED SERVICE PERSONNEL
DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE
DO NOT USE IN DAMP CONDITIONS
CAUTION VORSICHT
REMOVE POWER
BEFORE OPENING
VOR DEM ÖFFNEN
NETZSTECKER ZIEHEN
SERIAL No.:
THIS UNIT MUST BE EARTHED
230 VAC 50/60Hz MAX 600W
OUT IN IN IN OUT
LEFT SURROUND
RIGHT SURROUND
When the Hydra is used as a
slave in a Pre-Power or Bi-Amp
configuration, the AV input
becomes the power-amp input.
No other inputs are then used.
Connections HYDRA
Connections
Input connection
WARNING: The AV DIRECT input must not be used with sources that are not equipped with an independent volume control e.g.
most CD players and DVD players. This input is designed to be used only with an external surround sound processor that has an
independent volume control, or when the Hydra is used as a fixed level power amplifier, e.g. in a pre-power or bi-amp
configuration. The Hydra has an internal link which must be correctly set either by the factory or by your dealer, to configure the
unit for fixed level or for normal operation.
AV DIRECT> The Hydra’s AV DIRECT input is provided for those using a dedicated external multi-channel decoder or processor
equipped with a volume control. Sources with fixed output levels such as CD or DVD players MUST NOT be connected here.
When AV is selected, the volume level defaults to a low setting and then slowly rises to a preset unity gain point. The volume of
the Corvus and the Hydra will track the system’s volume. Great care should be taken when using the AV direct input since an
excessive volume level could easily result. However, unlike other systems, the volume control on the Leema system is still active
and can be adjusted away from the pre-set point as a safety feature. Selecting another input on the Tucana then re-selecting
the AV input will reset the unity gain point. In a surround system, the Tucana’s AV inputs should be connected to the surround
processor’s left and right analogue outputs. The processor’s left and right surround outputs should then be connected to the
Hydra’s left and right AV inputs. The remaining centre and subwoofer outputs from the processor should connect to their
respective inputs on the Corvus. For a more detailed explanation of how to connect the system in AV mode please see the
Corvus manual.
The AV DIRECT input becomes the power amp input when the Hyrda is optionally configured for fixed level operation.
Great care should be taken when using the AV DIRECT inputs since an excessive volume level could easily result.
For a more detailed description of bi-amplifying please see the next page.
7
MULTI 1> In a full surround system consisting of a Tucana, Hydra and Corvus, Multi 1 is used to connect the analogue outputs of
a multi-channel source such as a DVD-A, SACD or DVD player equipped with onboard multi-channel decoding. In such a system
the front left and right outputs from the source machine would connect to the Multi 1 inputs of the Tucana. The machine’s
surround left and right outputs would then connect to the Hydra’s Multi 1 inputs. The remaining centre and subwoofer outputs
from the source machine connect to the corresponding inputs on the Corvus.
MULTI 2> The Multi 2 inputs operate in the same way as Multi 1and may be used for a second multi-channel machine.
OUTPUTS:
PRE OUT> The Pre out connections mirror the selected system input e.g CD, or Multi 1. These outputs are controlled by the
Tucana’s volume control and can be used for a variety of uses. In a surround system they would be used to feed the Corvus’
side surround extraction inputs. Other examples include feeding a second amplifier in another room for a simple multi-room
system, or as a line level feed to one or two subwoofers.
BI-AMP> This connection is provided for those who may wish to bi-amplify a Hydra, for instance the surround channel Hydra in a
home cinema system could be bi-amplified. In this scenario use the Bi-amp outputs to connect the second Hydra’s AV inputs.
In a bi-amp Leema system, Tucana is used to drive the tweeters in the loudspeakers and a Hydra is used to drive the woofers.
This offers an increase in clarity by reducing intermodulation distortion. The loudspeaker no longer draws bass current from the
amplifier feeding the tweeter, resulting in cleaner high frequencies etc.
The loudspeakers must be suitable for bi-amping, this is normally the case where there are two pairs of binding post connections
available on the rear of the loudspeaker cabinets. When bi-amping, it is Vital to remove the bridging links from the connection
panel on the rear of the speakers, otherwise the outputs of the two stereo amplifiers will be connected together which will result in
considerable damage. If you are considering bi-amping, please contact your dealer or Leema Electro Acoustics Ltd. for
advice.
Connections
HYDRA
8
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