Line Monitoring & Amplifier Changeover

Amplifier Changeover : Auto and manual versions of standby amplifier fault changeover are available to ensure continuous and uninterrupted operation of system.

Line Monitoring  : Auto speaker line monitoring for 8 and 16 zones and also rack mounted amplifier monitoring panel.


Speaker line monitoring which detects fault in speaker circuits and changeover panel for standby amplifier takeover of failed duty units are features required to comply with EN54 and BS5839 Part 8 standards, as well as other localised regulations.

Amperes has what are required to perform those functions, as tabulated below.



LS4808   :  8 / 16 Ch Speaker Line Monitoring




AM4120  :  12 Ch Amplifier Monitor Panel

AS4000   :  Amplifier Surveillance Module



AC3801  :  8 Duty / 1 Standby Manual Changeover Unit

AX3800  :  8 Duty / 1 Standby Auto Changeover Unit

Model Lisiting


Speaker Line Monitoring

LS4808 / LS4816

8/ 16 Channel Speaker Line Surveillance

Amperes Speaker Line Monitor - LS4808


Amperes Speaker Line Monitor - LS4816

LS4808 and LS4816 are all new speaker line monitoring unit, replacing the long running LS4600. Now available in 2 versions ; 8 and 16 channels types.

With their new processor and measurement algorithm, they are now able to perform tasks faster with better accuracy. Additional features included were trigger monitoring, which can be linked to timer for preset times activation.

Similar to its previous model, they provide reliable speaker circuit monitoring for ground leakage, short and open circuit using impedance measurement method, thus eliminating the use of blocking capacitors and end line resistors. 



Amplifier Monitoring


12 Channel Amplifier Monitor Panel

Amperes 12Ch Amplifier Monitor Panel - AM4120

It is used to monitor amplifier audio outputs installed at rack for 70 and 100V line amplifiers. AM4120 comes with LED level meter and 1W speaker, catering for 12 amplifier outputs.

It is used to facilitate output level calibration of each output of the power packs and also to listen to the sound at rack, without having to run to the zone for checking.

Amperes Amplifier Monitor Module - AS4000


Amplifier Monitor Module

AS4000 is used to monitor the status of 70 / 100V line power amplifiers which do not have built in detection module. Each AS4000 shall be connected to individual power pack and dry contact from it shall be used to activate a changeover of AC3801 when failure is detected.  This contact may also be used for other purpose.


Standby Amplifier Changeover Unit


8 duty / 1 standby Manual Amplifier Changeover Unit

Amperes 8/1 Manual Amp Changeover Unit - AC3801

AC3801 is a manual changeover unit for standby amplifier takeover but can be used with amplifiers with auto fault sensor to enable auto changeover function when needed.

It is a 8 duty / 1 standby unit but can be cascaded for 1 standby to serve more than 9 duty amplifiers


8 duty / 1 standby Auto Amplifier Changeover Unit

Amperes 8/1 Auto Amp Changeover Unit - AX3800

AX3800 is 8 duty / 1 standby auto changeover unit , providing a switching platform for standby unit to replace the position of failed duty amplifier. Should one standby unit is required to serve more than 8 power packs, more than one AX3800 can be cascaded.

It provides switching both at input and output section, thus suitable for matrix system where all amplifiers has different input sources. Detection is via 20 KHz, which is inaudible to human ears.

While it is compatible for most makes of amplifiers, please check the specifications of the amplifiers as they may have high frequency cut off, which would make the overall changeover functions unstable.