Paso LAX200 Instructions For Use

Loop amplifiers
Instructions for use
FEATURES
• Up to 800m coverage
2
• 3 Inputs on XLR
• Phantom Power, Power Indication
• Current Mode Output
• Loop Monitoring
• Soft Start
• Compressor
• Compression Meter
• Full Protection System
• Protected Mixer & Drive Controls
• High Peak Current Capability
CHOOSING THE RIGHT UNIT
All in order to remove the 'magic' from loop amplifier specification, PASO recommends loop amplifiers are specified thus; by maximum square area and by
length if the shortest side. These areas relate to loops fitted at skirting board or ceiling (2.4 m) height and provide even loop coverage.
For example, the LAX200 will cover a square room 12.25 m per side (150 m
m (200 m ). In this example the LAX200 is rated at 150 m
2
to twice the shortest side, for example the LAX800 is rated at 20 m shortest side, to the other side of the rectangle can be a maximum of 40 m (giving
a coverage of 800 m ). If the loop is above 2.4 m in height, then 20% should be subtracted from the shortest length for every additional metre in height
2
the loop is (to a maximum of 4 m). These values do not take into account additional losses present in some building constructions, if you are in any doubt
always lay a temporary loop. It is always wise to allow 20% spare capacity when specifying a loop amplifier, just to cover the unknown element.
POWER SUPPLY
This equipment is designed for use with a mains voltage of 230 V ± 10% 50/60 Hz. The loop amplifier is supplied with its own power-supply cable, which
is equipped with an earthing wire. The earth terminal of the mains plug should never be removed under any circumstances. Connect the mains plug
of the amplifier to the power mains using the cable included in the supply. Make sure that the power outlet is equipped with a connection to earth in
accordance with the law.
SAFETY NOTES
The replacement of fuses must be carried out by specialized personnel only: when the cover is removed, parts liable to cause electric shocks are
exposed. Before removing the cover, always make sure that the power cord has been disconnected. In the event that liquid is accidentally spilt
onto the equipment, disconnect the mains plug immediately and contact the nearest PASO Service Centre.
INSTALLATION
Installation is simplicity itself, the unit should be sited in a convenient place, ideally as close to the area to be covered as possible, the loop cable
(a single turn loop of between 1 mm [LAX200], 1.5 mm [LAX450] or 2.5 mm [LAX800] CSA cable) is installed securely (see note 1) and the
microphone(s) are located as close to the area(s) where the sound is to be picked up from (see note 2). Mains power can now be applied using
the IEC cable supplied this cable has a moulded plug fitted, which can be removed if direct wiring to a fused spur is required, the spur should
be fused at 5A. The input mixer controls can now be adjusted so that the gain reduction meter moves to 12 dB on loud speech. The output drive
control can now be adjusted to give the correct field strength in the area to be covered. This is best done with a loop field strength meter during
installation, or a loop listening device (good practice is to supply a loop listening device to all installations to allow the responsible person to test
the loop periodically and record correct operation in a log booklet). Please note: The vent holes are not to be covered, if possible leave at least a
30 mm gap at the top and back of the unit. This will allow airflow through the unit.
Notes
1. If there is any doubt about the construction of the building, it is always best to lay a temporary loop in the approximate position the final loop will
occupy, this will determine the operation of the loop. Many new buildings contain aluminium in lost screed flooring, loops placed on the floor near this
aluminium will fail to operate satisfactorily.
2. Microphone cables must be run separately from the loop cable, under no circumstances should the cables be tied together for any distance, this
will cause magnetic feedback and the unit will not perform correctly. Good practice is to twist the loop feeder cable together between the start
and end of the loop and the amplifier.
DESCRIPTION
The LAX200, LAX450 & LAX800 form the professional range of PASO audio frequency induction
loop (AFILS) amplifiers and are designed to provide studio quality sound in an AFILS system.
The amplifiers have 3 inputs on XLR; 2 dedicated microphones and one microphone or line selectable
using a rear panel switch. User selectable Phantom Powering is available for the microphone inputs,
enabled via a rear panel switch. The inputs are individually mixed before passing to the compressor
limiter, which prevents loop overload whilst compensating for varying microphone usage.
All controls are recessed to prevent unauthorised access. Indication is provided for compression
level, output current, loop status and power supply. A loop current monitor socket is provided to
allow headphones to be used to monitor the actual loop current. An audio output (post compressor)
is provided for recording, with a slave audio in to allow cascading. A loop OK voltage is available to
illuminate a sign showing correct loop operation. The units are all 1u (44.5mm) high and a 19" rack
mounting kit is available.
square area and 10 m for the shortest side. The shortest side rating is valid for distances up
2
Amplifier Square Area
LAX200 150 m
2
LAX450 300 m
2
LAX800 450 m
2
), however the same amplifier will also cover a rectangular room 10 m by 20
2
Shortest Side Maximum Area
10m 200 m
15m 450 m
20m 800 m
LAX200
LAX450
LAX800
2
2
2
1