328A
Reference Monitor
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Operating Guide
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System Overview
Contents
INTRODUCTION
The Linn 328A is a fully active, 4-way, self-powered reference
monitor designed for professional audio applications where
accurate, revealing and realistic playback is essential.
Employing unique Linn playback technology, the 328A offers high
power, low colouration, low resonance, low distortion and
exceptionally good low frequency response for the size of
enclosure.
HIGH SOUND PRESSURE LEVEL WARNING
Linn monitors are capable of generating high sound pressure levels
(SPL). Your hearing can be damaged by exposure to high SPL for an
extended period of time. Therefore we recommend that you use an
integrating type sound level meter to measure your exposure to SPL
while using these monitors, and that you limit your exposure to
within that recommended by your national health authority.
It is not sufficient to rely on your own judgement concerning SPL
when working with high quality monitors because your perception of
SPL is dependent on the amount of distortion introduced by them.
Because this distortion is very low in the Linn 328A, you can be led
into believing the SPL is lower than it actually is and hence risk
exposure to damaging levels.
System Overview
Introduction
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High Sound Pressure Level warning
Cellphone warning
Applications
Unpacking
CELLPHONE WARNING
Cellular telephones should not be placed in close proximity to this
monitor due to the possibility of damage to the monitor, the
cellphone, or both caused by electromagnetic interaction.
Inspection
Voltage selection
Technical Overview
Twin LF drivers
APPLICATIONS
The 328A is suitable for the most exacting, high resolution audio
monitoring applications.
The unit’s compactness and low-profile silhouette give excellent
working visibility, making it an ideal reference tool for professional
music, broadcast, post-production and mastering applications.
Closed-loop LF control
3-K driver array technology
Amplifiers and power supplies
Cabinet design
UNPACKING
Your 328A Reference Monitor comes packed in a box with the
following accessories:
Graphs
Features
• one mains lead
• this manual
Mains Power inlet / fuse drawer
Power on indicator
Overload protection
Controls
The 328A monitor is heavy (45 kg) and must therefore be handled
using appropriate precautions to avoid the possibility of personal
injury. It should always be lifted and handled by two people while
unpacking or repacking and during subsequent positioning
operations.
Balanced Audio in
Speaker Sensitivity
Treble Shelf
We recommend you retain the packaging for reuse in case you
need to transport the unit at any time.
INSPECTION
Bass Roll-on
Your 328A left the factory in perfect condition but it is possible
damage may have occurred in transit. After unpacking your monitor,
and before connecting to mains power or other equipment, inspect
the monitor for such damage. If damage is found, immediately
contact the carrier for advice on their claims procedure.
Installation and Operation
Mounting recommendations
Connecting the Audio Input
Servicing
VOLTAGE SELECTION
Voltage selection is not needed. Your 328A is factory set to operate
from your local mains supply. The mains lead supplied may be
fitted with a fused plug according to local regulations. If this is the
case, always replace this fuse with another of the same type and
rating.
LF Driver removal and replacement
3-K Driver Array removal and replacement
Fuse replacement
Ordering spares
The 328A Reference Monitor must always be earthed when
connected to mains power. Use the earthed moulded mains
lead supplied. Never use an unearthed plug or adapter with
this unit.
Cleaning
Technical Specification
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Technical Overview
TWIN LF DRIVERS
GRAPHS
Two identical 8”/8Ω aluminium-alloy diaphragm LF drivers
deliver a -3 dB point of 20 Hz with a usable response
down to 15 Hz at -6 dB. These units are user-replaceable.
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CLOSED-LOOP LF CONTROL
To obtain the ultimate in low frequency response for the
cabinet size, closed-loop feedback is used to control the
LF drivers. This system uses an accelerometer mounted on
each diaphragm. These feed motion-related signals back
to circuits that ensure each 500 W power amplifier
produces exactly the right drive current under all
conditions, resulting in a highly accurate and extended low
frequency response.
10
10 Hz 20
50
100
200
500
1K
2
5
10
20
50
Anechoic response (flat)
3-K DRIVER ARRAY TECHNOLOGY
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An innovative positioning technique is used on the 328A
whereby the midrange, tweeter and super-tweeter drivers
are mounted on the 3-K driver array (patent applied for) in
front of an acoustically-shaped reflection cavity extending
below the baffle plane. This provides unmatched signal
reproduction accuracy in the mid and high frequency
ranges, together with excellent stereo imaging and
dispersion. The 3-K driver array is user-replaceable as a
unit.
Treble +1.5 dB
Flat
Flat
Treble -1.5 dB
Bass roll-on 50 Hz
Bass roll-on 100 Hz
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10 Hz 20
50
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500
1K
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AMPLIFIERS AND POWER SUPPLIES
Anechoic response showing effect of Treble Shelf
and Bass Roll-on equalisation features
All five amplifiers are conservatively rated for delivering
sufficient power to the drivers to achieve the rated
maximum acoustic output. The power supply high voltage
rails track the average output for maximum efficiency and
minimum heat generation.
CABINET DESIGN
The closed-cabinet design is low profile, flat fronted with
curved sides. Carrying handles on the sides make for easy
handling. The back panel comprises two large aluminium
heatsinks for the power amplifiers with a central plate
carrying the controls and connectors. Ventilation slots for
the amplifiers and power supplies run across the top of
the cabinet at the rear.
The sides and top of the cabinet are formed from painted
Hornflex™, an MDF-based material. This innovative
material makes possible the curved surfaces of the 328A
that greatly reduce internal standing wave patterns, and
hence practically eliminate colouration.
Four adhesive-backed rubber feet are supplied for
positioning on the base of the unit as required.
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Features
Installation and Operation
MAINS POWER INLET / FUSE DRAWER
A combined mains power inlet with integrated fuse drawer
is situated on the rear panel.
MOUNTING RECOMMENDATIONS
The most suitable position to mount the monitor is on a
stand behind the mixing console. Any stand used must be
able to carry the 45 kg weight of the monitor.
To help ensure safe operation it is important to consider
stability when mounting the monitor on a stand. There are
two methods of stand-mounting a 328A:
POWER ON INDICATOR
A blue LED on the front panel indicates when the unit is
operating. The LED will flash for 30 seconds when power is
turned on. During this time the servo circuitry is stabilising and
no audio will be issued from the bass drivers.
a) Placing directly on the stand platform (normally
rubber covered). The illustration below shows the
location of the centre of gravity (C of G) of the monitor
to help you position the 328A safely. The C of G
should fall as close to the centre of the platform as
possible.
OVERLOAD PROTECTION
Voltage clamps on the balanced amplifier input protect the
328A from accidental overdrive or spikes while allowing
excellent working headroom.
b) Fixing the four rubber adhesive-backed feet to the
base of the monitor and placing it on the stand
platform. The feet should be positioned surrounding
the C of G and as far from it as the platform size
allows. (See the illustration below for a suggested
placement.)
The amplifiers and power supplies are individually
protected from overload. If a protection circuit operates,
the associated driver will cease operation until the
circuit automatically resets. Thermal and current protection
is used on the power supplies, while the amplifiers
incorporate thermal overload protection.
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337
CONTROLS
The user controls described below
are mounted on the rear panel of
the 328A.
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Balanced Audio In
C of G
BALANCED
AUDIO IN
Accepts the output from an audio
signal source via an XLR
connector or 1/4” jack. The signal
can be balanced or unbalanced
SPEAKER SENSITIVITY
4dBu
10dBV
(see Connecting the Audio Input).
Positioning the feet relative to the C of G
TREBLE SHELF
0dB
Speaker Sensitivity
CONNECTING THE AUDIO INPUT
1.5dB
1.5dB
The 328A’s combined XLR / 1/4” 3-pole input connector
is wired to the balanced amplifier input as shown in the
table below:
Switches the input sensitivity of
the 328A monitor to either +4 dBu
or -10 dBV as required.
BASS ROLL-ON
19Hz
50Hz
100Hz
XLR input
Pin 2
Jack input
Tip
Treble Shelf
Signal (+)
Signal (-)
Ground
POWER
Provides a 1.5 dB boost or cut
adjustment to the HF response of
the 328A if required.
OFF
ON
Pin 3
Ring
Pin 1
Screen
If the source itself has a balanced output, use twin-
conductor shielded cable (microphone cable) connecting
Pin 2/Tip to Pin 2/Tip, Pin 3/Ring to Pin 3/ Ring,
and Pin 1/Screen to Pin 1/Screen (using the shield).
Bass Roll-on
Applies a 12 dB / octave roll-on
(at three preset frequencies) to
the LF response of the 328A if
required.
If the source has an unbalanced output, use single
conductor shielded cable with Pin 2/Tip of the input
connected to the ‘hot’ signal pin of the source, and
Pins 3/Ring and Pin 1/Screen linked together and
connected to the source signal ground.
VOLTAGE RANGE
100-120V 50-60Hz
220-240V 50-60Hz
REPLACE WITH FUSE:
BUSSMAN S506-10A 250V.
POWER CONSUMPTION 3kW
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Servicing
Installation & Operation
3-K DRIVER ARRAY REMOVAL AND REPLACEMENT
The 3-K driver array can be removed by unscrewing the
seven M4 retaining screws and carefully withdrawing the
unit directly away from the baffle until the built-in
connector at the back of the unit disengages.
Quick and easy maintenance was foremost in the design
brief for this monitor and therefore the drivers use modular
mounting arrangements so that they can be replaced
without the need for special tools or specialist personnel.
The replacement procedures are outlined below but fuller
versions (including explanatory graphics) can be supplied
on request.
Replacement is a reversal of the above procedure, taking
care to tighten the retaining screws no more than is
necessary to hold the driver array firmly in position (set
torque driver to 200 cNm if used).
LF DRIVER REMOVAL AND REPLACEMENT
An LF driver can be removed by an experienced technician
following the procedure below. This is most easily carried
out with the front of the monitor facing upwards.
FUSE REPLACEMENT
The fuse is a time delay type. Always replace with a fuse
of this type and rating (see the Technical Specification
section). If the fuse repeatedly blows within a short time of
being replaced, please contact Linn for advice.
1. Carefully remove the rubber trim ring covering the
rim of the grille, taking care not to damage the front
panel.
ORDERING SPARES
Service kits to replace the LF drivers and the 3-K driver
array and the amplifier module are available if required.
These service kits are user-installable and can be ordered
from Linn using the following codes:
2. Unscrew and withdraw the eight M5 retaining screws
using a No.25 Torx driver-bit.
3. Carefully remove the grille.
Servo-base Driver
3-K Driver Array
328A SDR
328A S3K
4. Withdraw the driver unit until the two cable
connectors are exposed.
Servo-base Driver
and 3-K Driver Array
5. Cut all cable ties securing wires to the driver
chassis, taking care not to damage any of the wires.
328A SPRS
You can place an order with Linn via:
6. Unsolder the cables from the driver terminals,
taking careful note of how the connections are
made.
Or, if you need more information (on pack contents,
pricing, etc.), you can contact the Linn Helpdesk via:
7. Disconnect the 3-way JST connector to free the unit.
Replacement is a reversal of the above procedure,
taking care to remake the driver connections
correctly.
or by telephone on:
+44 (0)141 307 7777
CLEANING
Damage to the driver may result when the unit is
switched on if these connections are remade
incorrectly.
Disconnect the 328A from the power supply before
cleaning. Remove dust and fingerprints with a soft, dry
cloth. Avoid using domestic cleaning products on the unit.
Tighten the retaining screws no more than is
necessary to hold the driver firmly in position.
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Technical Specification
Controls
Acoustic
Free-field
frequency response
24 Hz – 33 kHz
(- 3 dB points)
Speaker Sensitivity
Treble Shelf
92 dBA @ 1m ref. 0 dBu
-1.5 dB above 10 kHz
Flat
+1.5 dB above 10 kHz
Maximum short-term
output @ 1m on axis
114 dB SPL
Bass Roll-on
On/Off
12 dB/octave below
19, 50 and 100 Hz
Electrical
Rocker switch
on rear panel
Input impedance
Input sensitivity
6 kΩ balanced
+4 dBu or -10 dBV
switchable
Physical
Crossover frequencies
LF to MF
Drive units
455 Hz
LF
Two 8", servo-controlled,
aluminium-alloy cone
diaphragm
MF to HF
3.50 kHz
12.10 kHz
HF to SHF
Midrange
75 mm dome
25 mm dome
13 mm dome
Tweeter
Crossover slope
24 dB/octave
Linkwitz-Reilly
Super-tweeter
Power amplifiers
Bass
Cabinet construction
Input connector
Flat front and curved sides
with a carrying handle on
each side
2 x 500 W
MF: 250 W
3-K driver array
Combined XLR /
1/4" 3-pole jack
HF: 125 W
SHF: 125 W
Power On indicator
Mains fuse
Blue LED on front panel
Power
Bussman 10 A 250 V
Time Delay Type S506-10A
Standby
Typical
Peak
62 W
115 W
3000 W
Dimensions
Actual
Height: 280 mm (11")
1
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Width: 675 mm (26 ")
2
1
/
Depth: 570 mm (22 ")
2
Shipping
Height: 400 mm (16")
Width: 840 mm (33")
Depth: 685 mm (27")
Weight
Actual
43.5 kg
51 kg
Shipping
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Part 848
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