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Extracted text from Hafler GX2800 GX2800CE Owners Manual (Ocr-read)
Page 1
Declaration of Conformity
Application of Council Directive: 73/23/EEC (low voltage directive)
Application of Council Directive: 89/336/EEC (EMC Directive)
Standard(s) to which Conformity is Declared: EN55103 -1 (Emissions)
EN55103 -2 (Immunity)
EN60065 (Safety)
Manufacturers Name: Hafler
Manufacturers Address: 546 South Rockford Drive, Tempe, Arizona 85281
Importers Name:
Importers Address:
Type of Equipment: 2-channel Audio Power Amplifier
Model No.: GX2800CE
Serial Number:
Year of Manufacturing: 2000 2001 2002 2003 2004
I, the undersigned, hereby declare that the equipment specified above conforms
to the above Directive(s) and Standard(s)
Place: Hafler
Date: 5/1/2000 James C. Strickland, VP Engineering
-“ 13-“
AUDIO GROUND CHASSIS/FLOAT SWITCH
In general, the Audio Ground of each amplifier should be connected to AC mains earth ground AT ONE POINT ONLY-
either through the Chassis (by selecting the "Chassis" position) OR through the input cable (with the switch in the "Float"
position, and pin 1 of the XLR or the sleeve of the 1/4" connected to the ground of the signal source unit.)
The Chassis/Float switch can be used as a means to troubleshoot ground loop problems, or to verify wiring. Ground loops
are characterized by a hum or buzz through the speakers, and occur when multiple paths exist for a given ground circuit.
This switch allows the Audio Ground to be temporarily "lifted" or "floated" from the chassis, so continuity tests can be made
to verify or reverse-engineer a grounding system. The following information will be useful when planning or troubleshoot-
ing system wiring:
- The chassis is permanently conected to the earth (safety) ground pin of the Mains power connector.
- The Audio Ground of each GX2800 is permanently connected to the black terminals of both output binding posts, to pin
1 of each XLR input, and to the sleeve of each 1/4" input.
- The XLR shell is permanently connected to chassis.
- With the Chassis/Float switch in the "Chassis" position, the Audio Ground will be connected to the Chassis and AC mains
earth ground. This connection is made through a 0-„¦resistor (R350) located on the input board. The resistor serves as a
fuselink in the case of severe system faults. To check this resistor, remove all connectors from the amplifier and discon-
nect the AC main plug. With the switch in the "Chassis" position, use an ohmmeter to measure the 0-„¦resistance between
the earth ground pin of the AC mains plug and Audio Ground at either black terminal of the output binding posts.
- By selecting the Float position, the Audio Ground is not directly connected to the chassis, and can be referenced to
some other ground through the input cable or speaker ground. For safety reasons, a 0.1uF capacitor (C125) permanently
connects Audio Ground to chassis at RF frequencies, but only presents 27k-„¦of impedance at 60Hz.
OUTPUT
The speaker output connectors are dual binding posts which will accept wire up to 12 AWG, or spade connectors. They are
spaced on 3/4" centers for use with dual banana plugs. The positive output red terminals are oriented such that a dual
banana plug can be used for bridged mono operation.
POWER SWITCH
The power switch is located on the front of the amplifier. Two green "Power" LEDs indicate that the corresponding amplifier
channel is turned on. Standard practice is to turn the amplifier
on last , and off first when powering your system on and off.
This insures that any turn on/off glitches in source components or signal processing equipment will occur
before the ampli-
fier is turned on
, or after it is turned off . It is possible to leave the power switch on at all times and switch the amplifier
remotely with a breaker switch or other AC power switch. When doing so make sure the switch is rated for the current
required by the amplifier.
!
Page 15
-“ 14-“
The amplifier will operate with either a balanced or unbalanced signal source.
INPUT
The input jacks used on the GX2800 are dual function connectors which accept 1/4" TRS (Tip Ring Sleeve) or male XLR
plugs. The amplifier will operate with either a balanced or unbalanced signal, from earth ground or floated source equip-
ment. To determine if your equipment is earth grounded or floated, consult the owners manual or test with an ohmmeter.
The signal connections are as follows:
DAISY CHAIN OUTPUT
Proper cable wiring will be determined by the source equipment that is feeding signal to the amplifier.
EARTH GROUNDED SOURCE EQUIPMENT
Source Units with a 3-pin mains power cord will typically have the audio output ground connected to the earth-grounded
chassis. This can be verified with an ohmmeter by disconnecting the mains power cord from the AC outlet and checking for
continuity between the earth ground pin and the audio output ground. This test should be done with the equipment
installed in the complete system, including cables.
If the audio output ground is connected to the earth ground pin, it is
earth grounded equipment.
Consult the following diagrams for examples of recommended wiring techniques:
Tip Ring Sleeve Tip Sleeve sleeve shorts amplifier
- input to audio ground
1/4" Mono Unbalanced 1/4" TRS Balanced XLR Balanced
Operation
Shield
Chassis Audio
Ground XLR, 1/4" TRS Amplifier
SHIELDED TWISTED PAIR GROUNDED,
BALANCED
SOURCE
shield connected at one end only 1 3 2
Shield
Chassis Audio
Ground XLR, 1/4" TRS Amplifier
SHIELDED TWISTED PAIR GROUNDED,
UNBALANCED
SOURCE
shield connected at one end only 1 3 2
Shield
Float Audio
Ground XLR, 1/4" Mono Amplifier
1/4" Mono: sleeve shorts
- input to Audio Ground;
XLR: short pins 1 & 3 together
COAX OR TWISTED PAIR GROUNDED,
UNBALANCED
SOURCE 2
3
1
Page 20
-“ 19-“
1. Connect signal from source to CH B input.
2. Biamp/Stereo switch not active-(Stereo/Mono switch
overrides this switch when in mono/70V/100V mode).
3. Move Stereo/Mono switch to MONO mode.
4. Set load switches (8-„¦/4-„¦/2-„¦) to 1/2 the actual load
impedance. (16-„¦/8-„¦/4-„¦) i.e. for a 4-„¦speaker load,
select the 2-„¦setting for both CH A and CH B Load
Switches5. Connect appropriate speaker load 16-„¦/8-„¦/4-„¦across
the red terminals of the 5-way binding posts. CE units:
Wire SPEAKON as shown above and connect to CH A
output.
6. CH B level control adjusts the mono output level.
BRIDGE MONO MODE
CE SPEAKON
Connector
Wiring
Connect to CH A output
1. Connect signal from source to CH B input.
2. Biamp/Stereo switch not active (Stereo/Mono switch
overrides this switch when in mono/70V/100V mode).
3. Move Stereo/Mono switch to 70V mode.
4. Select 70V load, both channels.5. Connect parallel array of 70V transformer-equipped
speakers across the red terminals of the 5-way binding
posts. CE units: Wire SPEAKON as shown above and
connect to CH A output.
6. CH B input sensitivity controls 70V mono output level.
Amplifier will clip at 70Vrms level.
70V MONO MODE
CE SPEAKON
Connector
Wiring
Connect to CH A output