Palmer PLB2X8 Manuale utente
USER´S MANUAL
BEDIENUNGSANLEITUNG
MANUEL D`UTILISATION
MANUAL DE USUARIO
PLB2X8
Loadbox
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SphERE Of AppLIcATION
Unlike transistor amplifiers, amplifiers with a tube power stage always
require a speaker on the corresponding output. Ideally, the impedance
(ohm rating) of the speaker enclosure and the amplifier output should be
equal. Operating an amplifier without any load at all can result in de-
struction of the amplifier.
The Palmer PLB2X8 load box can be connected safely to a tube amplifier
instead of a speaker in situations where direct sound in the room is not
desired. For example, this is frequently the case in home studios where
minimizing noise is an issue.
The box contains two separate loads, each with an impedance of 8 ohms.
Thus the PLB2X8 is ideal for supplementing the Palmer PDI05 and PGA05,
which do not have a built-in load box.
In addition to 2-channel (stereo) operation, the PLB2X8 can also be used
in one-channel mode. Alternatively, impedances of 4 and 16 ohms are also
available. The load rating doubles.
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04
IMpORTANT SAfETY INfORMATION
1) Read these instructions before using this device.
2) Please comply with all safety warnings and keep these instructions in
a safe place for future reference.
3) Follow all instructions.
4) Never operate the device near water or in a damp environment.
5) Use a dry cloth for cleaning.
6) Do not position the device near sources of heat such as fan heaters,
heat accumulators, ovens or other devices that generate heat.
7) Use only the extensions/accessory parts recommended by the manufac-
turer.
8) If this device requires servicing, it should be serviced only by
qualified expert personnel. Service is required if the device was damaged
in any way, if fluids or objects have gotten inside the housing, if the
device was exposed to rain or moisture or if it does not function nor-
mally or has fallen down.
DO NOT ATTEMPT TO REPAIR THIS DEVICE YOURSELF. ALWAYS HAVE REPAIRS CAR-
RIED OUT ONLY BY QUALIFIED SERVICE PERSONNEL. DO NOT MAKE ANY INTERNAL
MODIFICATIONS OR CHANGES TO THIS DEVICE AND NEVER REPLACE THE INTERNAL
ELECTRICAL COMPONENTS. FAILURE TO COMPLY WITH THESE WARNINGS WILL EXPOSE
YOU AND OTHERS TO THE RISK OF ELECTRICAL SHOCK AND VOID THE WARRANTY FOR
THIS DEVICE.
Because PALMER is constantly improving its products, the technical speci-
fications and design are subject to change without notice. Existing prod-
ucts may be changed from time to time without prior announcement.
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INSTALLATION & OPERATING:
SETUp AND cONNEcTIONS
Position the PLB2X8 in a dry place so that the natural air circulation is
not restricted. The amplifier power is converted into heat. It is impera-
tive to avoid accumulation of heat; otherwise, the PLB2X8 could become
damaged. Never cover up the ventilation slits on the base and cover.
Moreover, the box should not be placed in the direct proximity of devices
which also generate heat.
For wiring, please use only speaker cable with a corresponding cross-
section. As a rule, a cross-section of 0.75mm² is sufficient for short
cables of up to 2m in length. Longer cables should have a cross-section
of 1mm² or 1.5mm². This applies for amplifier outputs of up to approx.
150W.
The wiring really requires no further explanation; the amplifier is con-
nected to the PLB2X8 instead of the speaker cabinet. The input jacks
(INPUT 1 and INPUT2) are on the rear panel. In (dual) stereo mode, both
jacks are used. In mono mode, you must use only INPUT 1.
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fRONT AND REAR pANEL
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IN OpERATION
Please carry out all settings and cabling only when the amplifier is off.
The rear slide switch must be positioned in accordance with the desired
mode of operation (mono or dual/stereo). It has three clearly discernable
detent positions that are labelled as follows: DUAL 2x 8Ω, Mono 4Ω, Mono
16Ω.
In DUAL (stereo) mode, there is an 8Ω dummy load on each of the jacks
INPUT1 and INPUT2. It is possible to use only one INPUT if a dummy load
of 8Ω is required. However, it can then also only be loaded with 100W
RMS. The alternative impedances 4Ω and 16Ω can only be used in mono mode
via INPUT1. In this case, INPUT2 must not be used. Before turning on the
amplifer, please doublecheck the switch setting on the PLB2X8 and whether
an identical setting was selected on the amplifier and/or whether the
speaker jack with the corresponding impedance was selected.
On the front panel are two LED indicators, SIGNAL PRESENT for INPUT 1 and
2. The LEDs light up when there is an input power of 3-5 watts, indi-
cating that there is an input signal present. Logically, in mono mode,
only the INPUT 1 LED is illuminated. Each dummy load may be loaded with
100 watts continuous power. Because music typically constitutes a dynamic
signal, however, amplifiers with outputs of 120 to 150 watts can be con-
nected - especially with good cooling. In MONO mode, however, an ampli-
fier output of 250 watts should not be exceeded. With heavy loading, the
device can reach temperatures exceeding 70°C.
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SpEcIfIcATIONS
Product type: Loadbox
Number of channels: 2
Type: passive
Input type: Unbalanced
Number of inputs: 2
Output type: Unbalanced
Number of outputs: 0
Output connections: n.a.
Loadbox: yes
Load box impedance: 2 x 8 Ω / 1 x 16 Ω / 1 x 4 Ω
Max. load: 2 x 100 W / 1 x 200W (mono mode)
Output impedance: n.a.
Voicing filter: no
Power attenuator: no
Transformer-balanced inputs: no
Indicators: Signal present
Controls: Mono / stereo switch
Power supply: n.a.
Housing material: Sheet steel
Housing surface: powder-coated
Width (inches): 19
Height (HU): 1
Dimensions (W x D x H): 480 x 180 x 44.5 mm
Adam Hall GmbH, all rights reserved. The technical data and the func-
tional product characteristics can be subject to modifications.
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LIMITATION Of LIABILITY
If your Adam Hall branded hardware product fails to work as warranted
above, your sole and exclusive remedy shall be repair or replacement.
Adam Halls’ maximum liability under this limited warranty is expressly
limited to the lesser of the price you have paid for the product or the
cost of repair or replacement of any hardware components that malfunction
in conditions of normal use.
Adam Hall is not liable for any damages caused by the product or the
failure of the product, including any lost profits or savings or special,
incidental, or consequential damages. Adam Hall is not liable for any
claim made by a third party or made by you for a third party.
This limitation of liability applies whether damages are sought, or
claims are made, under this Limited Warranty or as a tort claim (includ-
ing negligence and strict product liability), a contract claim, or any
other claim, and cannot be rescinded or changed by anyone. This limita-
tion of liability will be effective even if you have advised Adam Hall of
an authorized representative of Adam Hall of the possibility of any such
damages, but not, however, in the event of claims for damages in connec-
tion with personal injuries.
This manufacturer's warranty grants you specific rights; depending on
jurisdiction (nation or state), you may be be entitled to additional
claims. You are advised to consult applicable state or national laws for
a full determination of your rights.
REQUESTING WARRANTY-SERVIcE
To request warranty service for the product, contact Adam Hall or the
Adam Hall authorized reseller from which you purchased the product.
Ec DEcLARATION Of cONfORMITY
These devices meet the essential requirements and other relevant specifi-
cations of Directives 2004/108/EC (EMC) and 2006/95/EC (LVD). Additional
information can be found at www.adamhall.com.
pROpER DISpOSAL Of ThIS pRODUcT (WASTE ELEcTRIcAL AND
ELEcTRONIc EQUIpMENT)
(Valid in the European Union and other European countries with waste
separation)
This marking shown on the product or its literature indicates that it
should not be disposed of with other household wastes at the end of its
working life. Please dispose of this product separately from other waste
and have it recycled to promote sustainable economic activity.
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Household users should contact either the retailer where they purchased
this product, or their local government office, for details on where and
how they can recycle this item in an enviromentally friendly manner.
Business users should contact their supplier and check the terms and con-
ditions of the purchase contract. This product should not be mixed with
other commercial wastes for disposal
WEEE DEcLARATION
Your Palmer product was developed and manufactured with high quality ma-
terials and components wich can be recycled and/or reused. This symbol
indicates that electrical and electronic equipment must be disposed of
separately from normal waste at the end of its operational lifetime.
Please dispose of this product properly at a local collection point or
special recycling centres and help to protect our environment.
BATTERIES AND REchARGEABLE BATTERIES
The supplied batteries or rechargeable batteries can be recycled. Please
dispose of them as special waste or return them to your specialist
dealer. In order to protect the environment, only dispose of exhausted
batteries.
ENVIRONMENTAL pROTEcTION AND ENERGY cONSERVATION
Energy conservation is an active contribution to environmental protec-
tion. Please turn off all unneeded electrical devices. To prevent un-
needed devices from consuming power in standby mode, disconnect the mains
plug.
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Indice
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