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AUSTRALIAN MONITOR AM1200, Руководство по эксплуатации, Страница: 15 / 20

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Bridge Mode  15

5. Bridge Mode

The term BRIDGE is used when two independent
amplifier channels are used to drive the same load. The
load is in series (a bridge) between the two amplifier
channels.

Channel A is used as the "dominant" channel and its
output is in phase with the input signal, and channel
B has its phase reversed so it is exactly 180

0

 out of

phase with the input signal.

As two amplifiers with a phase difference of 180

0

 are

now driving the load you will now have double the
voltage into the load. This means you will now have four
times the power into that load. The output can now be
considered as an active balanced output.

A common use of an amplifier in BRIDGE mode is for
driving 70 volt & 100 volt distribution lines. In BRIDGE
mode, The 

AM1200

 can produce over 70 volts with line

impedances greater than 8 ohms and over 80 volts with
line impedances greater than 16 ohms.

Equally the units can be used in bridge mode to provide
the correct voltage/power requirements for an applica-
ble load.

As shown in Figure 6, there are three steps in setting

Figure 6   Bridge Mode Speaker Connection

up your amplifier for running it in BRIDGE mode.
Whilst the amplifier is off,
1. Connect the signal source to the Channel-A (or D)

female input XLR. The Channel-A (or D) attenuator
becomes the level control for both channels.

2. Engage the “push to bridge” switch.

3. Connect your load between the red binding post

output terminals, where the positive side of the
load is connected to the channel A (or D) output
(marked BRIDGE+) and the negative side of the
load goes to the channel B (or C) output (marked
BRIDGE

-

). There are no further connections re-

quired.

You can also source the output from the Channel-A (or
D) SPEAKON output connector where Channel-A (or
D) will be on the pin marked 1+ and Channel-B (or C)
will be on the pin marked 2+.

NOTE: You should check after market manufactured
Speakon interconnecting speaker leads before con-
necting them to your amplifier. Some leads are manu-
factured for specific purposes, or specific use, and
may have pins shorted inside the connector. Any
speakon lead with shorted pins will obviously short the
output of your amplifier (either to ground, or output to
output - be careful).

Содержание AM1200

Страница 1: ...O p e r a t i o n M a n u a l AM1200 ...

Страница 2: ...TNINGFLASHwithanarrowhead containedwithintheboundariesofanequilateraltriangle isintendedtoalerttheuserthatdangerousuninsulated voltages may exist within the unit s enclosure These voltages may be of a sufficient magnitude as to constitute the risk of an electrical shock This symbol is reinforced with the text ThepresenceofanEXCLAMATIONMARKcontained within the boundaries of an equilateral triangle ...

Страница 3: ...Input muting at turn on Inputovervoltageprotection Radio frequencyinterferencesuppression Thermal protection and indication Short circuit protection and indication Input signal strapping loop through connectors Active balanced inputs 21 Position detented attenuators Massive heat sink heat exchangers Efficient front to back cooling Dual twin speed axial fans Front and rear carry handles Front and r...

Страница 4: ... Operation 13 5 Bridge Mode 15 6 Two Ohm or Not Two Ohm 16 7 Maintenance 17 8 Warranty 18 9 Specification 19 List of Illustrations Page Figure 1 Block Diagram 5 Figure 2 Front Panel Layout 6 Figure 3 Rear Panel Layout 8 Figure 4 Case Dimensions 10 Figure 5 Speakon Connector Wiring 12 Figure 6 Bridge Mode Speaker Wiring 15 ...

Страница 5: ...evity The AM1200 amplifiers are 3 unit 5 25 tall 19 wide Figure 1 Amplifier Block Diagram Introduction 5 rack mountable units Each channel of the amplifier comprises a balanced active input with an attenuator driving a differential class A drive stage which in turn drives a fan cooled class AB MOSFET output stage configured as a sourcefollower Theunitoperatesfromahighcurrent capable linear power s...

Страница 6: ...6 Controls Connectors Figure 2 Front Panel Layout 2 Controls Connectors Indicators ...

Страница 7: ...ration 1 Itwillprovideindication e g grossoverload but does not affect the input signal a faint flash 2 It will indicate and mute the input signal e g shorted output brightly flashing or permanently on 4 Power Switch Press the switch DOWN for power ON and UP for power OFF At start up turn on the input to the amplifier is muted by 30dB for approximately two seconds 5 On Thermal Indicator When switc...

Страница 8: ...8 Controls Connectors Figure 3 Rear Panel Layout ...

Страница 9: ...edaspositiveandthe black post is used as negative 10 Mains Lead Your amplifier is supplied with a heavy duty mains Controls Connectors 9 lead powercord appropriatelyratedforthemains supply voltage marked on the rear panel of your amplifier The wires in the mains lead are coloured in accordance with the following code BROWN ACTIVE BLUE NEUTRAL GREENANDYELLOW EARTH CAUTION Your amplifier must always...

Страница 10: ...Figure 4 Dimensions 10 Installation ...

Страница 11: ...upport can be provided by secure shelving support rails or a rearrackmountingstriptomatchupwiththerearrack mount points provided on your amplifier Cooling Each pair of channels in your AM1200 amplifier is cooled by an axial fan which draws cool air from the front of the unit and expels the heated air via the rear oftheunit Theseunitsoffertwospeedfanswhichrun athalfspeed switchingtofullspeedwhenthe...

Страница 12: ...nation lugthatconnectsdirectlytothechassisoftheconnector Do not link this lug to pin 1 at the amplifier s input as it will defeat the amplifier s input grounding scheme This lug is often referred to as a drain and is used to provide a termination to the chassis for shielding purposes when a floating signal ground is required between the source and destination or when disconnecting the signal groun...

Страница 13: ...ommend turning the attenuators on your amplifier down when turning the unit on When you power up your amplifier your amplifier goes through an establishment period before it will acceptsignal TheInrushCurrentSuppression ICS circuit is in operation for the first 0 5 seconds This limitsthemainscurrenttoprevent nuisancetripping of circuit breakers During this period the THERMAL LED will flash red whi...

Страница 14: ...from a balanced signal source NOTE Be wary of quasi balanced outputs these are often no more than floating unbalancedoutputs 14 Operation 1 2 Each channel of your amplifier has a nominal balanced input impedance of 18k Ohms 1kHz and should not present a difficult load for any signal source Your signal source i e the equipment feeding the amplifier should have an output impedance of 600Ohmsorlowert...

Страница 15: ...own in Figure 6 there are three steps in setting Figure 6 Bridge Mode Speaker Connection up your amplifier for running it in BRIDGE mode Whilst the amplifier is off 1 Connect the signal source to the Channel A or D femaleinputXLR TheChannel A orD attenuator becomes the level control for both channels 2 Engage the push to bridge switch 3 Connect your load between the red binding post output termina...

Страница 16: ...eatagiven frequency Though this method is in line with the variousstandardsthatexist itonlygivesanindication to the maximum voltage swing before clipping for a given load This method of rating power does not give an indication of the current Ampere capability of the amplifier nor does it show the amplifier s ability to sustainhighenergywaveforms YourAM1200amplifierhasbeenspecificallydesigned to be...

Страница 17: ...hold the fan rotor still and wipe the dust off the blades Many users stall the fan and use Maintenance 17 compressed air to blow the dust off the fan blades It is important to note that the fan blades must be held still whilst blowing air over the blades otherwise you may burn out the bearings in the fan NOTE Make sure the unit is off and is unplugged from the mains Givethemainfiltercapacitorstime...

Страница 18: ...ERIES2YEARWARRANTYREGISTRATION IMPORTANT Please complete this card and return it immediately after unpacking the product This card is to be sent DIRECTLY to Australian Monitor NOTE Warranty is effective ONLY upon receipt of this card COMPANY NAME MODEL ADDRESS SERIAL No DATE PURCHASED CITY DEALER STATE CODE COUNTRY Ensure that you fill out and send your warranty registration card Use this copy to ...

Страница 19: ...of clipping 20 cycles 0dB 480 cycles 20 dB Single channel driven re 4 ohm 410 Watts Bridged pair driven re 8 ohm 750 Watts Bridged pair driven re 4 ohm 1000 Watts Distortion 0 5 dB below clipping re 4 ohms THD N 1 kHz 0 003 IMDSMPTE 60 Hz 7 kHz 4 1 0 015 IMD DIM 30 3 15kHz square 15 kHz 0 008 Output Impedance 1 kHz 0 011 ohms Damping Factor 1 kHz re 8 ohms 720 1 Output Rise Time 2 2µS 80 leading e...

Страница 20: ...y Ph 02 9647 1411 Fax 02 9648 3698 E mail nsw audiotelex com au Melbourne Ph 03 9890 7477 Fax 03 9890 7977 E mail vic audiotelex com au Brisbane Ph 07 3852 1312 Fax 07 3252 1237 E mail qld audiotelex com au Adelaide Ph 08 8352 4444 Fax 08 8352 4488 E mail sa audiotelex com au Perth Ph 08 9228 4222 Fax 08 9228 4233 E mail wa audiotelex com au Auckland Ph 09 415 9426 Fax 09 415 9864 E mail audiotlx ...

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