Field Acoustics UK 500 Instruction Manual Download Page 8

(7) Input Signal Sockets 

These are combined female XLR and 1/4" jack sockets. 
 

They provide a number of connection possibilities, including the industry standard Balanced 

XLR system, which helps ensure interference and noise free connections between equipment. 
 

Ready-made, sensibly priced, quality interconnection leads suitable for use with the amplifier 

should be easy to source. However, with sufficient skill, it is possible to make/modify leads for 
the task. Proceed to Chapter 5. - “Cables, Making your own”. 

(8) Output Mode Selector 

STEREO, MONO or BRIDGED (mono) Output can be selected using this switch. 
Take care to ensure the correct mode for your application is selected. 

l

 

In 

Stereo

  mode,  channels  A  and  B  can  be  operated  independently,  when 

fed with separate input signals. 

l

 

In 

(parallel) Mono

 mode, Input A is connected to both amplifier channel A 

and B. Input B is not used. Full independent level control over each amplifier 
output channel remains possible. 

l

 

In 

Bridged

 

(mono)

 modes, the input from channel A is fed out of phase to 

channel B. 

Note:

 

For this mode operation to work as intended, custom wiring must be 

used - See Chapter 5. 

 

(9)

 

Power Connection 

 

 

 
 
 
 

 

 
 
Mains power is supplied to the amplifier by a standard 10 Amp IEC mains socket. 
An appropriate mains lead is supplied with the amplifier. 
 

Note: 

The amplifier requires a stable power supply to function as intended. Ensure 

that  the  power  source  (mains  power  supply,  generator,  etc.)  is  suitable  for  this 
application and adequate power is available. Poorly selected power sources result 
in  sub-optimal  performance,  increased  likelihood  of  tripping  breakers,  blowing 
fuses and in extreme situations damage to equipment may occur. 

 
 

Should the fuse in the mains lead blow for any reason, it must be replaced 

with a fuse of the correct rating. This should be 13 amps for the models listed in 
this  manual.  However,  if  there  is  any  reason  to  believe  that  a  malfunction  caused  the  fuse  to 
blow,  stop  using  the  equipment  immediately  and  take  the  amplifier  to  an  authorised  service 
engineer for servicing. 
 

(10) Analog Crossover Section 

.

 

Not applicable to this amplifier model. 

 

 

 

 

 

 

Summary of Contents for UK 500

Page 1: ... o m Field Acoustics are distributed by Lamba plc Unit 1 Southfields Road Dunstable Bedfordshire United Kingdom LU6 3EJ Telephone 44 0 1582 690600 Fax 44 0 1582 690400 Email mail lambaplc com Web www lambaplc com If this product is ever no longer functional please take it to a recycling plant for environmentally friendly disposal Due to continuous product development specifications and appearance ...

Page 2: ...lly designed to transport the amplifier safely Unpacking Please unpack and inspect your new amplifier for any damage that may have occurred during transit If damage is found notify the carrier immediately Note A suitable mains lead is provided and can be found packaged with the amplifier PLEASE RETAIN ALL FACTORY PACKAGING FOR ANY FUTURE POSTAL TRANSIT CONTENTS Page Thank You 1 1 Features and Inno...

Page 3: ... Start Circuit The power supply is designed not to draw excessive current on startup Prevents the thump as occasionally seen with other equipment from tripping fuses and breakers Protection against Short Circuit and Overheating Speaker Protection relay with delay to inhibit switch on thump The speakers are disconnected during power up down Fully balanced XLR Inputs which also accept 1 4 jack conne...

Page 4: ...n mounting inside ensure that the amplifier is securely bolted into a rack using all available fixing points where possible Otherwise place on a surface where it cannot be easily displaced Potentially causing damage injury Ensure That the location will not expose the amplifier to spillage of liquids drinks sprays vapours or high humidity Ensure the amplifier is installed in a place which is not su...

Page 5: ...2 2 Basic Schematics Modes Output Connections OUTPUT B OUTPUT A 1 1 2 2 1 1 2 2 NO C ONNEC TION C H A N N E L B C HANNEL B C H A N N E L A 1 2 1 2 ...

Page 6: ... mode is selected on the rear panel It is most important that this indicator is not illuminated unless bridged mode is required This is because when bridged mode is selected Channel A will be out of phase with Channel B This will result in poor bass response and an unsatisfactory sound if left and right outputs are used In this mode Channel A controls the output level d Protect Indicators These in...

Page 7: ...r bridged mode l For STEREO MONO operation unmodified off the shelf cables will usually work fine l For BRIDGED MONO mode operation to work custom wiring MUST be used Chapter 5 NOTE Generously Heavy Duty Speaker Cable should be used to ensure optimal performance of the amplifier and loudspeaker system The cable should be at least comparable to good heavy duty 13 amp mains flex The use of heavy cab...

Page 8: ...ible l In Bridged mono modes the input from channel A is fed out of phase to channel B Note For this mode operation to work as intended custom wiring must be used See Chapter 5 9 Power Connection Mains power is supplied to the amplifier by a standard 10 Amp IEC mains socket An appropriate mains lead is supplied with the amplifier Note The amplifier requires a stable power supply to function as int...

Page 9: ...stem than it is rated for even greater care should be taken as it is not always be clear when the power handling of the speaker system has been exceeded However certain artifacts will usually present themselves before the amplifier reaches full output Exceeding the power handling of the speaker system will usually result in an audible rise in distortion and other artifacts Exceeding a safe level f...

Page 10: ...ses significantly Be sure that any speaker system connected can handle the voltages involved Any components used in the speaker system should be rated to at least 500v otherwise a failure may occur Note that the minimum impedance doubles for bridge mode from 4 ohms to 8 ohms this must be observed to avoid the possibility of damage to the amplifier and poor performance l Thirdly Custom wiring must ...

Page 11: ... be clearly marketed as pro audio microphone signal cable For long cable runs in excess of 6m 20ft try to use cables with lower capacitance ratings to minimise any loss of sound quality Keep cable runs short where possible however be sure allow a little bit of slack in the length of cable used to make the lead Stretched overstressed cables tend to break at the most inconvenient moments S ID E FR O...

Page 12: ...6 Ohms Power Loss 13 25 DF 107 86 67 DF Damping Factor est Power Loss 13 62 DF 215 105 75 DF Damping Factor est Power Loss 07 62 DF 430 127 86 DF Damping Factor est wires AWG mm2 wires AWG mm2 wires AWG mm2 1 3 2 12 2 5 2 12 2 5 2 12 2 5 Rec Minimum 2 16 1 3 2 16 1 3 2 16 1 3 3 10 4 12 2 5 2 12 2 5 2 12 2 5 Rec Minimum 2 12 2 5 2 16 1 3 2 16 1 3 6 20 4 10 5 4 12 2 5 2 12 2 5 Rec Minimum 4 12 2 5 2...

Page 13: ...d in order to keep the losses and degradation to a minimum Loads of less than 4ohms are not generally recommended even for amplifiers which will support them as it puts the amplifier under considerable stress and also dramatically reduces the damping factor Typically a 2 ohm load will compromise damping factor enough to audibly degrade the performance of the speaker system Consult the tables on th...

Page 14: ...ersonnel 4 THE AMPLIFIER IS WORKING BUT OUTPUT VOLUME IS LOW l Check the signal from the input source and signal cables The amplifiers are designed to operate at an input voltage of 1 2V If the signal source is below this refer to qualified service personnel for a minor modification 5 AMP OUTPUT LEVEL INDICATORS ARE WORKING BUT NO SOUND IS COMING OUT l Check Speakon connectors are securely attache...

Page 15: ... receipt of the defective product All expenses in remedying the defect including freight costs from ourselves to you within mainland UK will be borne by us You must bear the costs of shipping the product to our authorised service centre or factory How to Obtain Warranty Service You must notify us of your need for warranty service not later than the expiry of your warranty The amplifier must be shi...

Page 16: ...patibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting Control Apparatus for Professional Use Part 1 Emissions EN 55103 1 1997 Magnetic Field Emissions Annex A 10 cm and 20 cm EN 55103 2 1997 Electromagnetic Compatibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting Control Apparatus for Professional Use Part 2 Immunity EN 6100...

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