programmable control interface sxl -...

© BITTNER-AUDIO

Programmable Control Interface

SXL

Installation & Operations Manual

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© BITTNER-AUDIO

BITTNER INSTALLATION & OPERATIONS MANUAL

Programmable Control Interface BITTNER SXL - Installation & Operations Manual © 2006 Bittner-Audio. All Rights Reserved. Bittner-Audio reserves specification privileges Information in this manual is subject to change without notice or obligation. Version 1.1 Table of Contents

DECLARATIONS OF CONFORMITY...................................................................................................................... 2 CAUTION ......................................................................................................................................................... 2 TECHNICAL SPECIFICATIONS ............................................................................................................................ 3 UNPACKING AND INSTALLATION ........................................................................................................................ 3

FRONT VIEW: .............................................................................................................................................. 3 REAR VIEW: ................................................................................................................................................ 4

POWER CONNECTION ...................................................................................................................................... 4 LED INDICATORS............................................................................................................................................. 4 SXL FUNCTIONS TABLE ................................................................................................................................... 4 GENERAL INFORMATION................................................................................................................................... 6 FEATURES....................................................................................................................................................... 6 CONNECTING AND ADDRESSING OF AMPLIFIERS................................................................................................ 7 MANUAL CONTROL AND MONITORING FROM THE FRONT PANEL ......................................................................... 7

IP AND SUBMASK ADDRESSING .................................................................................................................... 7 COMMUNICATION MODES............................................................................................................................. 8 ADDITIONAL INFORMATION ........................................................................................................................... 8 MENU ITEMS ............................................................................................................................................... 8 PARAMETERS.............................................................................................................................................. 8 PRESETS .................................................................................................................................................... 9

CONTROL AND MONITORING THROUGH THE SXL WEB INTERFACE...................................................................... 9 LOG-IN WINDOW ......................................................................................................................................... 9 WINDOW ‘AMP STATUS’ .............................................................................................................................. 9 WINDOW ‘AMP SETTINGS’: ......................................................................................................................... 10 WINDOW ‘CONFIGURATIONS & ADVANCED SETTINGS’: ................................................................................ 11 WINDOW ‘SXL SETTINGS’:......................................................................................................................... 12 WINDOW ‘DSP SETTINGS’: ........................................................................................................................ 12 WINDOW ‘LOG FILE’:.................................................................................................................................. 13

CONTROL AND MONITORING THROUGH THE SXL MANAGER SOFTWARE ........................................................... 13 LOGICAL INPUTS OF THE SXL......................................................................................................................... 14 RELAY OUTPUTS OF THE SXL ........................................................................................................................ 15 PAGING INPUT ............................................................................................................................................... 15 MONITOR OUTPUTS ....................................................................................................................................... 15 EXTERNAL MONITOR INPUTS ......................................................................................................................... 15 FIRMWARE UPGRADE..................................................................................................................................... 15

1) UPLOAD WITH SXLU: ............................................................................................................................ 15 2) UPLOAD DIRECTLY VIA COMMAND LINE ................................................................................................... 15

WARRANTY TERMS & CONDITIONS ................................................................................................................. 16 Congratulations and thank you for your decision buying a device from BITTNER-Audio.

DECLARATIONS OF CONFORMITY Bittner-Audio hereby declares that this product is in accordance with the following standards: EMC Regulation 89/336/EEC (Electromagnetic Compatibility) EN-55013 (Radio Disturbance, Emission) EN-55020 (Electromagnetic immunity)

CAUTION To reduce the risk of electrical shock, do not remove the cover. There are no user serviceable parts inside, refer all servicing to qualified personnel. Replace fuses only with same type. Avoid damaging the AC plug or cord. It can potentially causing a shock hazard.

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The unit should only be connected to an AC power supply of the correct voltage. To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture. Do not use this unit in damp areas or near water. The unit must be adapted slowly to extreme temperature changes. These extreme changes can cause moisture development inside the unit that can cause failure and /or electrical shock. Always use safe operating techniques! Incompetent and improper servicing can void the warranty.

TECHNICAL SPECIFICATIONS Amplifier Controls AC Status, Remote Power On/Standby, Auto Detection of Bridge Mode,

Auto Amplifier Detection, Power On Delay 0 to 10 s in 0,1 s Increments Channel Monitoring Output Clip, Protect Status, Input Level, Temperature, Output Voltage,

Output Current, Output Power, Headroom, Load (short/open), Ground Short (100 V)

Channel Controls Gain, Mute, Input On/Off, Input Polarity, Input Sensitivity, Paging On/Off, Monitor Polarity, Monitor Level +6 dB to -90 dB in 0,5 dB Increments, DSP Settings

Special Functions 4 Logical Inputs 5-24 Volt (High), 4 Logical Outputs / Relay 10A / 240VAC

each, 16 Presets in a Non-Volatile Memory, Presets may be recalled per Logic Inputs, Versatile Error Matrix, LCD for all Functions, Keys for the Control of Display and Parameters, RS232 Port for Service & Diagnosis, Diagnosis LED

Communication Ethernet 10Base-T (10Mbit / RJ45), TCP/IP based Protocol + sxl web Inputs Paging (electronically balanced, PHOENIX connector),

Monitor (electronically balanced, PHOENIX connector), Nominal Level +4 dBu, max. Input Level +20 dBu

Outputs Monitor (electronically balanced, PHOENIX connector), Nominal Level +4 dBu LEDs Link per Amplifier, Status and User Diagnostic LEDs, Ethernet Link and Activity LEDs

Dimensions 483 mm x 335 mm x 44 mm (1 RU / 19") Weight 4 kg

UNPACKING AND INSTALLATION Upon unpacking, please inspect the unit. If you find any damage, notify your supplier immediately. Be sure to save the carton and all packing materials in case you have to send the product to the supplier. Please use only the original factory packing. If the shipment carton is unavailable, contact BITTNER-Audio to obtain a replacement. The unit will mount in standard 19-inch racks. For the installation 4 standard bolts should be used.

Front View:

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Rear View:

POWER CONNECTION The unit must be connected only with the attached three-wire safety power cord with protective conductor (non-fused earthed conductor). The unit is made for use with the mains voltage labeled on the rear panel. Check the label for the appropriate voltage. Make sure the voltage of your mains outlet is correct. Damage caused by connecting the unit to improper AC voltage voids the warranty. The power fuse is located on the rear panel of the amplifier and can be accessed from the outside. Use only the appropriate fuses as labeled.

LED INDICATORS The SXL is equipped with 8 LEDs for amplifier connection status, 2 for Ethernet status and 2 for diagnostics

LED Color Function

AMPLIFIER 8x red Each LED indicates the connection of two amplifier channels, independent of the power switch status. (A connected 8-channel amplifier will be indicated with four illuminated LEDs, any connected stereo amplifier will be indicated with one illuminated LED.) Blinking LED indicates event detected by error matrix.

Link 1x red Indicates Connection to Ethernet

Act 1x red Indicates Activity on Ethernet

Stat 1x red Indicates Normal Status of SXL with short blink once per second

Diag 1x green General purpose user LED, controllable by communication protocol, may be used e.g. to identify SXL while diagnosing communication

SXL FUNCTIONS TABLE Device Controls

(read & write) Detectors (read only)

Applicable to Models

Amplifier Standby XRCS, XR-DSP, 8X, 4X SwitchOnDelay XRCS, XR-DSP, 8X, 4X ACStatus XRCS, XR-DSP, 8X, 4X Online XRCS, XR-DSP, 8X, 4X Operating Mode XRCS, XR-DSP, 4X Model XRCS, XR-DSP, 8X, 4X Amp Channel InputActive XRCS InputInvert XRCS, XR-DSP Mute XRCS, XR-DSP, 8X, 4X Gain XRCS, XR-DSP, 8X, 4X MonitorBusA XRCS, XR-DSP MonitorBusB XRCS MonitorInvert XRCS PagingActive XRCS, XR-DSP InputSensitivity XRCS MonitorGain XRCS

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ShortThreshold XRCS, XR-DSP OpenThreshold XRCS, XR-DSP Mixer.Input1Gain XR-DSP Mixer.Input2Gain XR-DSP EQ.1..10.Freq XR-DSP EQ.1..10.Q XR-DSP EQ.1..10.Gain XR-DSP EQ.1..10.Bypass XR-DSP Xover.LP.Freq XR-DSP Xover.LP.Bypass XR-DSP Xover.HP.Freq XR-DSP Xover.HP.Bypass XR-DSP Delay XR-DSP Gate.Threshold XR-DSP Gate.Release XR-DSP Gate.Bypass XR-DSP Dynamics.Limiter XR-DSP Dynamics.Compressor XR-DSP Dynamics.Ratio XR-DSP Dynamics.Attack XR-DSP Dynamics.Release XR-DSP Dynamics.Gain XR-DSP Dynamics.Bypass XR-DSP Generator.Signal XR-DSP Generator.Freq XR-DSP Generator.Gain XR-DSP Clip XRCS, XR-DSP, 8X, 4X Protect XRCS, XR-DSP, 8X, 4X InputLevel XRCS, XR-DSP OutputPeakVoltage XRCS, XR-DSP OutputPeakCurrent XRCS, XR-DSP Temperature XRCS, XR-DSP OutputPower XRCS, XR-DSP OutputLoad XRCS, XR-DSP OutputShort XRCS, XR-DSP OutputOpen XRCS, XR-DSP Headroom XRCS, XR-DSP Logical Inputs Log Input 0-3 SXL Relay Outputs Rel Output 0-3 SXL Status ConfigByInputs SXL Date SXL Time SXL IP SXL Mask SXL AsyncChange SXL ConfigChanged SXL Monitor ExternalMonitorInputA SXL ExternalMonitorInputB SXL Diag DiagLED SXL Config Save SXL Recall SXL Default SXL ConfigStatus SXL ActualConfigNum SXL ErrorMatrix Enable SXL ClearError SXL GroundShort SXL OutputOpen SXL OutputShort SXL Temperature SXL

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Protect SXL Online SXL ACStatus SXL FirstErrorName SXL FirstErrorDate SXL FirstErrorTime SXL LastErrorName SXL LastErrorDate SXL LastErrorTime SXL AX16 Online AX16 Mode AX16 SXLControl AX16 AmplifiersOK AX16 AX16Alive AX16 AX16ACstatus AX16 LastFailedAmp AX16 FailuresCounter AX16 Gain1..14 AX16

GENERAL INFORMATION SXL is the centre piece for power management, amplifier control and monitoring. It works embedded in a LAN network, over the Internet or as stand-alone unit with manual front panel control. Up to 16 amplifier channels can be connected to one SXL unit. The 16 amplifier channels can be combined of two-channel, four-channel and eight-channel amplifiers. The controlled amplifiers are connected to the SXL unit with the system bus based on the I2C protocol. To connect the amplifiers to the SXL control unit ribbon cable with the appropriate connectors is used. The length of the connection cable should not be more than two meters. Therefore the amplifiers and the corresponding SXL control unit should be mounted within the same installation rack. The SXL has 16 non-volatile scene memories (1 basic setup and 15 configurable memories), automatic detection of connected amplifiers, non-polarity logical inputs and high power relay outputs. SXL monitors amplifiers output voltage, current, load impedance and power. The SXL also provides effortless communication with the digital signal processing inside the intelligent XR power amps. Up to 15 complex scenarios may be switched by the single push of a button. All significant events are logged and can be sent as a syslog and/or e-mail message via the Internet for seamless control. Two groups of parameters are handled on the SXL: Controls and Detectors: Controls manage the behaviour of connected amplifiers (e.g. Standby, etc.). Detectors inform and indicate about the actual state of the physical or logical features of the selected amplifier or amplifier channel (e.g. temperature, etc.). Controls are ‘Read’ and ‘Write’, Detectors are ‘Read’ only.

FEATURES - LAN connection via RJ-45 (10Mbit)

- Setting and reading all vital parameters of connected amplifiers

(the range of available monitor/control functions depends on the type of amplifier).

- Front LEDs for the indication of connected amplifiers

- Remote on/off switching of the amplifier (power on / standby selection)

- Remote indication of the power status (AC status indication)

- Audio signal level indication and CLIP indication

- Monitoring the PROTECT status of the amplifier

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- Audio signal remote switching / muting

- Remote audio level control (audio signal +6dB to – 90dB in 0.5dB step)

- Remote priority switching of a paging signal (paging audio signal locally fed to the individual SXL unit)

- Remote switching of four relays per SXL

- Remote detection of four logical inputs per SXL

- Two monitor audio signal outputs

- Local and remote control

- ActiveX component library to build user applications independent of the BITTNER-Audio TCP/IP protocol

- Embedded WEB server with SXL Web Interface

- Remote firmware upgrade by TFTP protocol

CONNECTING AND ADDRESSING OF AMPLIFIERS Bittner controllable amplifiers are equipped with an internal control board for the communication with the SXL controller. Any connected amplifier must be set to the appropriate address for proper communication with the SXL unit. The amplifier address will be set on the rear panel of the amplifier. The amplifiers are addressed from “00” to “07”. The amplifier must be restarted before the address change takes place.

MANUAL CONTROL AND MONITORING FROM THE FRONT PANEL The SXL can be set up manually on the front panel of the unit completely without any connected computer or network by using the UP / DOWN and LEFT / RIGHT keys. All controllable features and all monitored values (except live level indication) are available in the manual operation mode. All parameters are displayed on the two-line, 16 digit LCD display on the front panel of the unit.

LCD display and buttons of the SXL front panel control

The LCD display shows the menu item in the upper left space, additional information in the upper right space and the parameter’s value in the second line of the display:

---------------- CHAN.2 !loc #Gain= -19.5dB ----------------

IP and Submask Addressing Before the network connection can be established, the proper IP address and the correct Submask settings must be made. The settings can be changed on the manual front control panel. The IP address is one of the SERVICE PARAMETERS. Normally these parameters are locked to avoid eventual unwanted changes. To change any of the SERVICE PARAMETERS, the SXL must be set into SERVICE MODE. The SERVICE PARAMETERS are: IP Address (IP), Submask (MS), Gateway (GW) and Authorized Server (AS).

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To put SXL to SERVICE MODE, press the UP and DOWN key concurrently until a short beep can be heard and on the upper right corner of the LCD display “sm1” is visible. By pressing the left and right keys, the PARAMETER GROUPS can be changed and are indicated on the LCD display. Go to “SXLSTAT”. After reaching the PARAMETER GROUP “SXLSTAT”, the individual parameters can be accessed by pressing the up and down keys. After getting the parameter “IP”, ENTER must be pressed. Now the IP address can be changed by using the UP and DOWN keys. Using the RIGHT and LEFT keys the next IP number can be accessed. After setting all four IP numbers, the settings should be saved by pressing ENTER again. The same procedure must be made to change the SUBMASK (MS) settings. If you need to change the GATEWAY (GW) and Authorized Server (AS) settings, these parameters can be changed in the same way. To go back from the SERVICE MODE to the USER MODE press the UP and DOWN keys concurrently again. Attention: After changing the IP address, the unit must be switched off and on again to make the settings permanent.

Communication Modes The communication modes will be indicated by: <w1> <w2> <w*> <rw> (w = write, r = read) The modes are selected by pressing the button ‚Cancel’/’Mode’ on the front panel of the unit. Pressing the button will switch through the individual modes one by one (pressing the button ones enters the mode <w1>, pressing the button twice enters the mode <w2> and so on). <w1> In this mode only the writable and controllable parameters are shown, the digit 1 means that only the actually chosen amplifier respectively channel will be changed. <w2> Equivalent with <w1>, but by changing a channel, also the appropriate stereo channel will be

changed. <w*> All amplifiers respectively channels will be changed simultaneously. Used for instance to set all

amplifiers into standby. <rw> Equivalent to the mode <w1>, but also all parameters (write and read only) are shown. For instance

the AC status, etc.

Additional Information !loc The SXL is controlled via the Ethernet network. Local access is locked and not available. This status

is automatically set as soon as the unit continuously communicates over the Ethernet. !sm1 Service Mode Level 1. The service mode is used to change basic settings like the IP address (see

above).

Menu Items The available menu items are: AMP - CHAN - INPUTS - RELAYS - SXLSTAT - MONITOR - DIAG - CONFIG - MATRIX - AX16 These menu items are selected with the cursor buttons LEFT and RIGHT.

Parameters Every menu item has its own set of parameters. These parameters are selected with the Up and Down buttons on the front panel of the unit. Only the parameters that are available within the connected unit (amplifier) will be displayed.

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Writable parameters are displayed with the pound key in front: #Standby=ON. To change a parameter, it must be selected with the Up and Down keys and recalled by pressing the Enter button. After recalling the parameter it will be displayed with squared brackets: #Standby=[ON]. Now the value can be changed by pressing the Up and Down keys. Parameters with a larger range can be changed faster by pressing the Up or Down key continuously. The selected value must be confirmed by pressing the Enter button. With the Cancel button the operation can be cancelled.

Presets After powering-up the SXL now for the first time, it will start in the default configuration (Preset 0). 16 presets that contain all parameters can be stored. The initial default preset number 0 can be changed later to any other of the stored presets.

CONTROL AND MONITORING THROUGH THE SXL WEB INTERFACE The most convenient way to control the SXL and the connected amplifiers is to use the SXL Web Interface. After setting up the SXL within the network, simply type in the IP address of the connected SXL to get access to the unit. Several windows are accessible with status information and control options. The appearance of the individual web pages can be changed by any html editor.

Log-In Window The first appearing window is the Log-In Window. User Name and Password are required. As default the following settings enable the first connection to the unit:

User Name (Default): sxl Password (Default): 11111

User name and password can be changed later.

Window ‘AMP Status’

screen shot ‘amplifier status’

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The window ‘Amp Status’ indicates all connected amplifiers and their status:

- model number - standby - powered - mode - channel - clip - protect mode - temperature - load (speaker line check) - short (speaker line check) - open (speaker line check) - power in Watts

16 configurations can be stored and recalled via the Web interface.

Window ‘Amp Settings’:

screen shot ‘amp settings’

In the window ‘Amp Settings’ all chosen settings for each amplifier channel are displayed and can be monitored:

- power delay (wait time until the amplifier is switched on) - channel - mute - input levels - gain - page (switching of the paging signal into the signal path) - active - invert - sensitivity - short (minimum resistance of the checked speaker line to indicate failure) - open (maximum resistance of the checked speaker line to indicate failure)

The button ‘Dsp’ recalls the DSP settings.

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Important: Any change in the parameter settings takes place only after the data is sent to the amplifier. This must be executed by pressing the SET buttons next to each parameter’s area. In the above window this is ‘Set 1’, ‘Set 2’ etc.

Window ‘Configurations & Advanced Settings’:

screen shot ‘configuration & advanced settings’

In the window ‘Configurations & Advanced Settings’ general and network parameters can be set or changed. To send an e-mail in case of failure the e-mail address and other settings must be set here. Important: Any change in the parameter settings takes place only after the data is sent to the amplifier. This must be executed by pressing the SET buttons next to each parameter’s area.

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Window ‘SXL Settings’: In the ‘SXL Settings’ window the relay functionality must be configured. The four available power relays can be set to work in OFF or ON position and any combination of the four relays can be chosen for any of the listed cases (see next page):

screen shot ‘SXL settings’ for the configuration of the available relays

Important: Any change in the parameter settings takes place only after the data is sent to the amplifier. This must be executed by pressing the SET buttons next to each parameter’s area.

Window ‘DSP Settings’: The in-build DSP controller in the XR Series amplifiers can be controlled via the web interface too. All available features of the DSP are accessible:

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screen shot ‘DSP control’

Important: Any change in the parameter settings takes place only after the data is sent to the amplifier. This must be executed by pressing the SET buttons next to each parameter’s area.

Window ‘Log File’:

screen shot ‘log file’

The log-file of the SXL will be stored in the unit. Messages can be sent to the syslog receiver or via e-mail to any e-mail address over the Internet (Internet must be connected through a router etc. and the e-mail feature must be activated).

CONTROL AND MONITORING THROUGH THE SXL MANAGER SOFTWARE The SXL Manager is the conventional computer software to control the SXL unit through the network without using the Web Interface. The software is available from BITTNER-AUDIO and must be installed on a WindowsTM computer. The computer must be set to the appropriate network settings for Ethernet connection to the SXL units within the network.

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With the SXL Manager the network can be searched for connected SXL units (Menu: Devices). As soon as SXL uits are available on the network, they show up in the very left window of the software with the IP address and (by double clicking) with all amplifiers connected to the unit. This way the entire SXL network can be checked very easily. A missing SXL in the list in the very left window indicates a communication problem with this unit. In this case approach the unit directly and check the hardware connections and the network settings on the unit locally. By clicking on one SXL in the very left window, the parameters of all connected amplifiers will be displayed in the right large window. The signal levels are displayed live in the level bars and faders, mute buttons etc. can be accessed online. Different to the web interface, here all parameters and level changes are executed directly online without the need to execute the data transfer separately by pressing the ‘Set’ button on the web interface.

screen shot of the SXL Manager

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LOGICAL INPUTS OF THE SXL The SXL is furthermore equipped with four galvanic isolated logical inputs, which can be read with the control software in the control computer. The inputs are active (ON status) as soon as a voltage of +5V to +24V is supplied. The polarity does not matter. These logical inputs are accessible over PHOENIX connectors and are located at the back panel of the SXL. The inputs can be set to recall stored preset. For this they must be enabled by the “CfgByInput” parameter from the SXLSTAT parameter group (See chapter ‘Manual Control and Monitoring from the Front Panel’).

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RELAY OUTPUTS OF THE SXL The SXL is equipped with four relay outputs also located at the rear panel of the SXL. These outputs are designed for a maximum load of 10A @ 240VAC. Three pins are available for each relay: C (common), NO (normally opened), NC (normally closed). The relays are programmable with the RELAY MATRIX (see Web Interface Control).

PAGING INPUT A paging signal (0 dBu) can be applied to the SXL that is remotely switched to any of the connected amplifier channels in a priority mode. Emergency calls and paging signals can be easily supplied to the sound reinforcement system using this feature. The PHOENIX audio connector is located at the rear panel of the SXL.

MONITOR OUTPUTS Some of the BITTNER amplifier models have additional audio outputs to monitor the loudspeaker signals (0 dBu). These outputs are integrated into the ribbon cable connector on the rear panel of the amplifier. The outputs represent the loudspeaker power outputs, divided by a resistor network. Over the software of the control computer the individual amplifier channel can be routed and switched to this monitor outputs. The monitor output of each channel can be only activated via SXL command and is switched to the two PHOENIX monitor outputs connector at the back of SXL unit. XR models have stereo monitor outputs with adjustable gain and polarity, while XRDSP models have mono monitor output connected to the SXL unit. Any of 16 channels can be monitored one after another.

EXTERNAL MONITOR INPUTS An external signal (0 dBu) can be applied to every of the 2 SXL monitor buses via PHOENIX audio connector placed at the rear panel of the SXL.

FIRMWARE UPGRADE A necessary firmware update can be accomplished in two ways:

1) Upload with SXLU: To upgrade the SXL unit, the SXL software package must be installed to a PC computer within the network. The SXL must be accessible by this computer and the new firmware file “sxl ---.bit” must be available on the computer. Now on the computer open the software program “SXL Upgrade Utility”. After the program is connected to the SXL double click on “Firmware Version” in the right-hand window and just upload the firmware.

2) Upload directly via Command Line To upload the new firmware directly without installed SXL software, open the DOS window on the connected computer. Type in the following command line: “ TFTP -i “ followed by the IP address followed by: “ put sxl----.bit ” (sxl file with version number). For instance: TFTP -i 172.16.48.120 put sxl123.bit The upgrade file will be uploaded immediately. ATTENTION: Power-down and power-up the unit or use the Restart feature in the SXL Upgrade Utility or in the SXL web interface. The new firmware is then installed and ready to go.

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WARRANTY TERMS & CONDITIONS Bittner-Audio (the manufacturer) warrants this product to be free from defects in materials and workmanship. Should any part of this equipment be defective, the Manufacturer agrees to repair or replace any defective part free of charge (except transportation charges) for a period of three years from the date of the original purchase. Warranty service is effective and available to the original purchaser only. To obtain service under this warranty, the product must, on discovery of the defect, be properly packed and shipped to the nearest Bittner-Audio dealer. The party requesting service must provide proof of original ownership and date of purchase of the product. If the warranty is valid, Bittner-Audio will, without charge for parts or labour, either repair or replace the defective parts. Without a valid warranty, the entire cost of the repair is the responsibility of the product’s owner. The warranty does not cover defects or repairs needed as a result of: 1. Damage caused by abuse, accident, or negligence. 2. Damage caused by any tampering, alteration, or modification of the product or its components. 3. Damage caused by failure to maintain and operate the product in strict accordance to the written instruction of this operating manual. 4. Damage caused by repairs or attempted repairs by unauthorized persons. 5. Damage caused by fire, water and other natural events. 6. Damage caused by operation on improper voltages. BITTNER-Audio

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