Explanation of symbols used in this manual and on the product:
This symbol is intended to alert the user to the presence of uninsulated
dangerous voltages within the enclosure of sufficient magnitude tocause electric shock.
This symbol is intended to alert the user to the presence of important
maintenance and servicing information in the instruction and service
manuals.

CAUTIONTO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE THE COVER.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING: SHOCK HAZARD. DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR.
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY
WITH THE CORRECT TYPE OF FUSE
ATTENTION: POUR UNE PROTECTION DURABLE CONTRE LES RISQUESD'INCENDIE, REMPLACER UNIQUEMENT CE FUSIBLE PAR UN AUTRE DU
MÊME TYPE:DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE.
ATTENTION: DEBRANCHER AVANT DE REMPLACER LE FUSIBLE.

WARNINGTO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THISAPPLIANCE TO RAIN OR MOISTURE.

MAINS PLUGSThis appliance is supplied with a non-rewireable mains plug for the intended
country.
Replacement mains leads can be obtained from your Linn retailer.
Should you need to change the plug please dispose of it carefully.
A plug with bared conductors is dangerous if engaged in a live socket.
The Brown wire must be connected to the Live (Line) supply pin.
The Blue wire must be connected to the Neutral supply pin.
The Green/Yellow wire must be connected to the Earth (Ground) supply pin.
Please contact your retailer or a competent electrician if you are in any doubt.

GENERAL SAFETY INSTRUCTIONS
1.
2.
3.
4.
5.

Read instructions. Read the safety and operating instructions before operating the appliance.
Retain instructions. Retain the safety and operating instructions for future reference.
Heed warnings. Observe all warnings on the appliance and in the operating instructions.
Follow instructions. Follow all operating and use instructions.
Water and moisture. Do not use the appliance near water, for example near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a swimming pool and the like.
6. Carts and stands. Use only with a cart or stand that is recommended by the manufacturer.
6a. An appliance and cart combination should be used with care. Quick stops, excessive force, and unevensurfaces may cause the appliance and cart combination to overturn.
7. Wall or ceiling mounting. Mount to a wall or ceiling only as recommended by the manufacturer.
8. Ventilation. Site the appliance so that its location or position does not interfere with its proper
ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface
that may block the ventilation openings, or placed in a built-in installation such as a bookcase orcabinet that may impede the flow of air through the ventilation openings.
9. Heat. Site the appliance away from heat sources such as radiators, heaters, stoves, or other appliances(including amplifiers) that produce heat.
10. Power sources. Connect the appliance to a power supply only of the type described in the operating
instructions or marked on the appliance.
11. Grounding or polarisation. Do not defeat the safety purpose of the polarised or grounding type plug.
A polarised 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 is provided for your safety. When theprovided plug does not fit into your outlet, consult an electrician for replacement of the obsolete
outlet.
12. Power cord protection. Route power cords so that they are not likely to be walked on or pinched byitems placed upon or against them, paying particular attention to cords at plugs, power sockets, and at
the point where they exit from the appliance.
13. Protective attachment plug. As a safety feature the product is equipped with an attachment plug
containing overload protection. See the instruction manual about resetting or replacing the plug.
Should the plug need replacing ensure that a replacement is used which has the same overload
protection as the original.
14. Cleaning. The product should be cleaned only as recommended by the manufacturer.
15. Power lines. An outdoor antenna should be located away from power lines.
16. Outdoor antenna grounding. If an outdoor antenna is connected to the tuner/receiver, ensure that theantenna system is grounded to provide some protection against voltage surges and static build up.
In the USA see article 810 of the National Electrical Code ANSI/NFPA 70 concerning installation
requirements.
17. Lightning storms. Unplug this apparatus during lightning storms or when unused for long periods oftime.
18. Objects and liquid entry. Take care not to let objects or liquids fall into the product.
19. Damage requiring service. The product should be serviced by qualified personnel if:a) The power cord or plug has been damaged.
b) Objects or liquid have fallen into the product.
c) The product has been exposed to rain.
d) The product does not appear to operate normally or exhibits a marked change in operation.
e) The product has been dropped or the enclosure damaged.
20. Servicing. Don’t attempt to service the product beyond that described in the operating instructions.
All other servicing should be referred to qualified service personnel.

EnglishImportant Safety Information

English

UK USERS PLEASE READ THIS IMPORTANT
SAFETY INFORMATION
Replacing the fuse in the mains plug
This appliance is fitted with a non-rewireable 13 Amp mains plug. The plug
contains a 5 Amp fuse. If the fuse has blown it can be replaced as follows:a) Pull out the red fuse cover/carrier.
b) Remove and dispose of the blown fuse.
c) Fit a new 5 Amp BS1362 approved fuse into the carrier and push the carrierback into the plug.
Always ensure the fuse cover is fitted. If the fuse cover is missing do not use
the plug. Contact your Linn retailer to obtain a replacement fuse cover.
Fuses are for fire protection and do not protect against electric shock.

CE Declaration of Conformity
Linn Products Ltd declare that this product is in conformance with the Low Voltage Directive 73/23/EEC
and Electromagnetic Compatibility 89/336/EEC as amended by 92/31/EEC and 93/68/EEC.
The conformity of the designated product with the provisions of Directive number 73/23/EEC (LVD) is
proved by full compliance with the following standards:
Standard number
EN60065

Date of issue
1998

Mains plug replacement
Should your mains plug need replacing and you are competent to do thisproceed as follows. If you are in doubt contact your Linn retailer or a competentelectrician.
a) Disconnect the plug from the mains supply.
b) Cut off the plug and dispose of it safely. A plug with bared conductors isdangerous if engaged in a live socket.
c) Only fit a 13 Amp BS1363A approved plug with a 5 Amp fuse.
d) The cable wire colours or a letter will be marked at the connection pointsof most quality plugs. Attach the wires securely to their respective points.
The Brown wire must go to the Live pin, the Blue wire must go to the Neutralpin, and the Green/Yellow wire must go to the Earth pin.
e) Before replacing the plug top ensure that the cable restraint is holding theouter sheath of the cable firmly and that the wires are correctly connected.

WARNINGTHIS APPLIANCE MUST BE EARTHED.

Test type
General requirements
Marking
Hazardous radiation
Heating under normal conditions
Shock hazards under normal
operating conditions
Insulation requirements
Fault conditions
Mechanical strength
Parts connected to the mains supply
Components
Terminal devices
External flexible cords
Electrical connections andmechanical fixings
Protection against electric shock
Stability and mechanical hazards
Resistance to fire

The conformity of the designated product with the provisions of Directive number 89/336/EEC (EMC) isproved by full compliance with the following standards:
Standard number
EN55013EN55013EN55020

Date of issue
2001
2001
2002

Test type
Conducted emissions
Absorbed emissions
Immunity

FCC Notice
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmfulinterference to radio communications. However, there is no guarantee that interference will not occur in aparticular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct theinterference by one or more of the following measures:- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.

Copyright © Linn Products Limited. First edition June 2002.
Linn Products Limited, Floors Road, Waterfoot, Glasgow, G76 0EP, Scotland,
United Kingdom.
All rights reserved. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without the prior written consent of the
publisher.
Printed in the United Kingdom.
Linn 2250 and the Linn logo are trade marks of Linn Products Limited.
The information in this manual is furnished for informational use only, is subject tochange without notice, and should not be construed as a commitment by Linn
Products Limited. Linn Products Limited assumes no responsibility or liability for any
errors or inaccuracies that may appear in this manual.

EnglishCopyright and Acknowledgements

EnglishIntroduction
Linn 2250

Aktiv cards

The Linn 2250 is a high power two-channel amplifier designed for use in multiamplifier audio and video systems. It exemplifies Linn’s unremitting commitment to
exploiting the latest technology in order to produce ever better sounding products.
The unit’s features include Linn’s switch mode power supply (see below), automatic
signal sensing, bi-wireable speaker outputs and the option to add a stereo Aktiv card(see opposite ) for improved audio performance.

The Linn 2250 power amplifier has been engineered to support both passive andactive loudspeaker crossovers. In a passive crossover the audio signal from a system’s
amplifier is split by circuitry inside a loudspeaker into bass and treble, or bass, mid
and treble (depending on the type and size of loudspeaker). With a passive system a
portion of the energy in the audio signal is required to power the crossover, which
naturally has an affect on the overall quality of sound reproduction. The benefit of anactive system is that the audio signal is split within the amplifier and each split‘segment’ is further amplified before being fed to the speakers. Active crossover
systems sound more dynamic than passive systems as the speakers are provided withmore energy to drive them.

Switch mode power supply
The power supply in most amplifiers contains a large and heavy transformer, a
rectifier and reservoir capacitors. These components convert the voltage of the mains
supply to the low voltage required by electronic circuits, and supply this lower
voltage to the amplifier circuitry at a constant level – regardless of the demands ofthe amplifier. Such power supplies use electricity inefficiently and cause mains power
distortion which can lead to electrical and acoustic noise.
In a switch mode power supply, the incoming mains voltage is chopped up by very
fast semiconductor switches and is then passed through a small transformer andother components, which convert the voltage to the value needed by the amplifier
circuitry. By controlling the timing of the semiconductor switches, the voltage
supplied to the amplifier circuitry can be instantly altered to suit demand. Linn’sswitch mode power supply is not only efficient, it also eliminates mains power
distortion resulting in superior performance and sound quality.

Linn have developed active crossovers, called Aktiv cards, which have been optimisedfor our range of loudspeakers. Once fitted, Aktiv cards can be fine-tuned to suit therequirements of your room and enhance your listening experience. Aktiv cards can be
fitted into your Linn 2250 power amplifier by your local Linn specialist retailer.

EnglishUnpackingInputs and Outputs

The Linn 2250 power amplifier comes in a box with the following accessories:

The unit has both unbalanced and balanced inputs, selected by a push-button switch
on the back panel. Use the appropriate push-button position to suit your choice of
preamplifier and cabling. The LEDs on the back panel will indicate which inputs are
selected. The push-button does not directly pass the audio signal but instead sends acontrol signal to distortionless solid state switches. Both unbalanced and balanced
signals are passed through the unbalanced and balanced line out sockets to enabledaisy-chaining of amplifiers.

Back Panel

Voltage Selection

This unit must be earthed. Use the earthed moulded mains lead supplied.
Never use an unearthed plug or adaptor.

Positioning
Allow at least 10cm of space to the front, rear, sides and above the Linn 2250 power
amplifier. Do not block the ventilation grills on the front of the unit or the vents on
the sides, top and bottom.
The unit can be rack mounted in a 19” rack (Linn part no. RAKK-19/1).

Cleaning
Disconnect the Linn 2250 power amplifier from the power supply before cleaning.
Remove dust and fingerprints with a soft damp cloth. Avoid using domestic cleaningproducts on the unit.

4

5

6

VOLTAGE SELECTOR

10

7

8

9

2 CHANNEL POWER AMPLIFIERWITH AUTOMATIC SIGNAL AND AKTIV CARD SENSING

OFF

ON

The unit is factory-set for a 230 volt mains supply and must not be connected
to a mains supply other than this before it is adjusted for your local voltage.
To set the voltage, use a screwdriver to adjust the voltage selector on the backof the unit to the correct setting.

2

230

Do not connect the mains supply until you have verified that the unit is set tothe correct voltage for your mains supply.

1

CH1 AKTIV CH 2
SETTING VOLTAGE RANGE:115 100 - 120V ~ 50.80Hz
230 220 - 240V ~ 50.80Hz

CHANNEL 2

CHANNEL 1

INPUT

INPUT
1

1

CAUTIONDISCONNECT SUPPLY CORD
BEFORE CHANGING FUSE.
REPLACE FUSE WITH T6.3AL
250V TYPE.

_ SPEAKER _AUDIOOUTPUTUNBALANCEDPHONOPOWER CONSUMPTION: 100W MAX.

3

OUTPUT

BALANCEDINPUT

BALANCEDOUTPUTLED

AUDIO

OUTPUT
2

2

WARNING THIS APPARATUS MUST BE EARTHED_ SPEAKER __We recommend that you retain all packaging in case you need to transport the unit at
a later date.

_2 x 1.2m phono leads
2 pairs of speaker plugs
mains lead
warranty card
this manual

BALANCED XLR

11

BALANCEDOUTPUT

BALANCEDINPUTOUTPUT

SEE UNDERSIDE FOR
SAFETY DETAILSLED

1 Power switch
2 Voltage selector
3 Mains input

Channel 1
4 Audio (unbalanced) input and output
5 Balanced input and output
6 Speaker outputs

Channel 2
7 Speaker outputs
8 Balanced input and output
9 Audio (unbalanced) input and output

10 Aktiv card controls (if card is fitted)
11 Unbalanced/balanced push-button
LED Indicate selected input

The Linn 2250 power amplifier should be powered down then disconnectedfrom the mains supply before connecting or disconnecting any of the plugs on
the back panel. If this is not done you may generate surges which could
damage the unit or other components in your AV system.

EnglishSignal Sensing

Operation

The signal sensor in the Linn 2250 power amplifier waits about one second before
powering-up the amplifier to be certain the input signal is real, not just noise.
The detection threshold is a good compromise between sensitivity to low-levelsignals and immunity to noise. However, residual hiss level from phono preamplifiers
at moderate volume settings can be enough to trigger the sensor. Mute thepreamplifier or turn the volume down after use to prevent this happening.

The blue light on the front panel will be dim when power is first applied, and remains
dimmed when the unit is in standby mode. When a signal is detected the lightbrightens as the amplifier is enabled. If the amplifier needs to protect itself (forexample, if the internal temperature gets too high) it will shut down for a few
seconds and the light will dim. There is no half-way current limiting: the unit caneither do what is required of it or will shut down. The amplifier will revert to standby
mode ten minutes after the input signal ceases.

If there is audible hum from the loudspeakers then you may have enough noisepresent to trigger the signal sensor. Always try to eliminate any source of hum as thisis essential for a system to sound its best.

To operate the Linn 2250 power amplifier, select a source on your preamp, wait acouple of seconds for the unit to power up, then sit back and enjoy it.

Ten minutes after an audio input signal ceases, the unit reverts to a low-power
standby mode.

Heat
The Linn 2250 power amplifier is very powerful and hence must dissipate a lot ofheat. This is normally done via the internal heat sink and vents in the outer casing.
However, if the amplifier is being worked enthusiastically or has restricted ventilation,
the unit’s two internal fans will operate and will remain running until the internal
temperature has dropped to a pre-set level.

This product is guaranteed under the conditions which apply in the country ofpurchase and your statutory rights are not limited. In addition to any statutory rights
you may have, Linn undertake to replace any parts which have failed due to faulty
manufacture. To help us, please ask your Linn retailer about the Linn warranty schemein operation in your country.
In parts of Europe, the United States of America and some other markets, extended
warranty may be available to customers who register their purchase with Linn. A
warranty registration card is included with the product and should be stamped byyour retailer and returned to Linn as soon as possible.

Warning
Unauthorised servicing or dismantling of the product invalidates the manufacturer’s
warranty. There are no user serviceable parts inside the product and all enquiries
relating to product servicing should be referred to authorised retailers only.
Technical support and information
For technical support, product queries and information, please contact either yourlocal retailer or one of the Linn offices opposite.
Full details of your local retailer/distributor can be found on the Linn web site:www.linn.co.uk
ImportantPlease keep a copy of the sales receipt to establish the purchase date of
the product.
Please ensure that your equipment is insured by you during any transit or
shipment for repair.

Linn Products Limited
Floors Road
WaterfootGlasgow G76 0EP
Scotland, UK
Phone: +44 (0)141 307 7777
Fax: +44 (0)141 644 4262
Helpline: 0500 888909
Email: helpline@linn.co.uk
Website: http://www.linn.co.uk
Linn Incorporated
8787 Perimeter Park BoulevardJacksonville
FL 32216
USA
Phone: +1 (904) 645 5242
Fax: +1 (904) 645 7275
Helpline: 888-671-LINN
Email: helpline@linninc.com
Website: http://www.linninc.com
Linn Deutschland GmbH
Albert-Einstein-Ring 1922761 Hamburg
Deutschland
Phone: +49-(0) 40-890 660-0
Fax: +49-(0) 40-890 660-29
Email: info@linngmbh.de
Website: http://www.linn.co.uk

EnglishGuarantee and Service

EnglishTechnical Information
Input connectors
Unbalanced (switch position in)
Balanced (switch position out)
Pin connections

WBT phono socket
XLR socket
Phono
Inner: Hot (+)
Outer: 0V
XLR
Pin 1: 0V
Pin 2: Hot (+)
Pin 3: Cold (-)

Gain
Unbalanced
Balanced

28.3dB
22.3dB

Input impedance
Unbalanced
Balanced

7K8ohms
7K8ohms

Input level for clipping
Unbalanced
Balanced
Signal sensing threshold

1.2V rms
2.4V rms>150uV

Output power

230W rms into 4ohms
115W rms into 8ohms

Load tolerance

Unconditionally stable into all
loudspeaker loads

Harmonic distortion<0.02%

Frequency response

7Hz to 35kHz (-3dB)

Peak output voltage

45V

Protection
Fuse rating
Mains input range

Maximum input power
Typical operating input power
Standby power

T6.3A
90VAc – 126VAc
200VAc – 253VAc@50/60Hz
1000W
44W
15W

Dimensions

75mm (H) x 381mm (W) x 354mm (D)Weight5.25kg

Pack 756