Boothroyd Stuart Meridian M1 User manual

BOOTHROYD STUART
ERIDI;4N

1 •
.OPERATING 'INSTRUCTIONS FOR BOOTHROYD STUART
MERIDIAN Ml ACTIVE LOUDSPEAKER
The Boothroyd Stuart Meridian Ml Active Loudspeaker
is a precision musical transducer of advanced design.
In order to achieve the very best results from the
loudspeaker it will be necessary to read this
instruction sheet and spend some time in careful
listening to arrive at the final position in the
room.
If you are in any doubt please consult your dealer.
Do not connect the loudspeaker without reading the
section on connection.
Unpacking
Carefully remove the electronics section in the
separate carton and take care not to discard any
plugs and spare leads supplied. Lay the large
pack on its side and carefully slide the loud-
speakerenclosure.out. Retain all packing materials
for future use. If supplied, keep all test documents
under the amplifier tray for future reference. Take
care not to hold the cabinet at the back where the
ABR drive unit is located.
Cabinets finished in ash veneer with a painted
topcoat, should be cleaned!with normal furniture
creams or aerosol polishes but no other solvents
must be used. Oiled wood finishes must be treated
with suitable oils and not polish. The 'Crimplene'
grille and back cloth may be brushed clean and
sponged with a damp cloth if necessary.
The Ml Active Loudspeaker is designed to accept
signals from either (i) a pre-amplifier source or
head amplifier with variable output or (ii) a
balanced line signal from a mixer or professional
pre-amplifier.

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2.
Each system requires its own electronics tray
to be placed in the base of the loudspeaker
cabinet with the label towards the front grille.
This tray is free standing on rubber feet and
must be moved from the enclosure before trans-
porting the loudspeaker. A cable fitted with
a 6 way plug is attached to the loudspeaker
cabinet and this should be plugged to the
'ENCLOSURE CONNECTION SOCKET' on the electronics
tray (see diagram).
The connections needed to be made to complete
the installation are :-
The switched. mains power is taken from the
driving amplifier or preamplifier.
A three core 'Y' configuration cable connects
between the main power input sockets on the rear '
of each speaker electronics set using the lead
supplied.
For a low level from a pre-amplifier such as the
Meridian 101 Control Unit, a screened cable is
·used to carry the signals to each loudspeaker. The
twin screened cable should be carefully divided at
the loudspeaker end to provide adequate tails to
reach each speaker.
The sensitivity of the M1 is OdBm (775mV) into
4kO, it is internally selectable ~y your dealer
to -20dBm (77.5mV) and may be driven by a balanced
line @ 6000. The connections to the 5 pin Cannon
XLR are:-
1. Common Ground
4. Hot +
5. Cold-
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3.
UNDER NO CIRCUMSTANCES make or break connections
to the interactive speaker when the unit is
switched on since this could cause loud inter-
ference noise or damage.
Positioning
The interactive loudspeakers have an integral
stand and are intended to be floor standing.
It is not possible to lay down any hard and fast
rules about the positioning of a loudspeaker in
the listening room. The design o~ the speaker
ensures tha£ the enclosure sits the correct
distance off the floor and that the mid and high
frequency signals are presented to the seated
listener around ear level. In a normally furnished
living room the quality~f sound produced by a
loudspeaker is very dependent upon the distance
of the loudspeaker from the walls.
The very best result will usually be obtained
with the speaker placed with its back 1m from one
wall and the loudspeakers, each at least 1m from
a side wall. Ideally the two speakers should face
the listening position being angled in towards
each other very slightly and at least 2m apart.
Larger spacing may be required if the listening
position i~ more than' 3m from the loudspeakers.
General Points
WARNING -THE SPEAKER ELECTRONICS MUST BE EARTHED
(GROUNDEO)*
The case of the electronics is isolated from
signal earth (ground). In all cases ensure that
3 core cable is used on the Power Input
,and that the green/yellow wire is connected to
a reliable earth.

4.
If the 101 is used to drive the Ml, then its
outlet is earthed provided that the 3 core
cable powering the pre-amplifier 101 is
connected to the mains earth.
*Rote this provision may not apply in some
countries outside the U.K.
If in any doubt consult your dealer.
The interactive loudspeakers are fitted with an
automatic system which protects the speaker by
swtiching off for a few 'seconds if the unit is
overdriven. This is a normal function of the
speaker but it should only happen at very loud
levels. "
When carrying the loudspeaker great care should
be taken not to damage the drive units. It will
be found that to remove the grille frame will
facilitate hand holds. Always disconnect and
remove the amplifier section before carrying the
loudspeaker.
Service
In the event of malfunction consult your dealer.
If it is necessary to return the unit to a service
centre for repair it is suggested that initially
only the amplifier section be returned. This' is
possible because the electronics are designed
to protect the loudspeak~r ~ection from damage.
The Ml Loudspeaker is manufactured by:-
Boothroyd stuart Limited,
13 Clifton Road,
Huntingdon,
Cambridgeshire,
ENGLAND.
~el. st. Ives (0480) 57339.
October 1980.