SR Series Crossovers
Owner’s Manual
• SR 823
• SR 834
A Harman International Company
These symbols are internationally accepted symbols that warn of potential
hazards with electrical products.The lightning flash means that there are
dangerous voltages present within the unit.The exclamation point indicates
that it is necessary for the user to refer to the owners manual.
These symbols warn that there are no user serviceable parts inside the unit.
Do not open the unit. Do not attempt to service the unit yourself.Refer all
servicing to qualified personnel. Opening the chassis for any reason will void
the manufacturer’s warranty. Do not get the unit wet. If liquid is spilled on
the unit, shut it off immediately and take it to a dealer for service.
Disconnect the unit during storms to prevent damage
.
U.K. Mains PlugWarning
A molded mains plug that has been cut off from the cord is unsafe.
Discard the mains plug at a suitable facility.Never under any circum-
stances should you insert a damaged or cut mains plug into a 13
amp power socket.Do not use the mains plug without the fuse cover
in place. Replacement fuse covers can be obtained from your local retailer.Replacement fuses are 13 amps and MUST be ASTA approved to
BS1362.
Safety Instructions
Notice for customers if your unit is equipped with a power cord.
Warning:This appliance must be earthed.
The cores in the mains lead are colored in accordance with the following
code:
Green and Yellow - Earth Blue - Neutral Brown - Live
As colors of the cores in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug, proceed as follows:
•The core which is colored green and yellow must be connected to the
terminal in the plug marked with the letter E, or with the earth symbol, or colored green, or green and yellow.
•The core which is colored blue must be connected to the terminal
marked N, or colored black.
•The core which is colored brown must be connected to the terminal
marked L, or colored red.
This equipment may require the use of a different line cord,attachment
plug, or both,depending on the available power source at installation. If the
attachment plug needs to be changed, refer servicing to qualified service
personnel who should refer to the table below.The green/yellow wire shall
be connected directly to the unit’s chassis.
Warning: If the ground plug is defeated,certain fault conditions in the unit
or in the system to which it is connected can result in full line voltage
between chassis and earth ground. Severe injury or death can then result if
the chassis and earth ground are touched simultaneously.
LIVE
E
NEUTRAL
EARTH GND
CONDUCTOR
L
N
BROWN
BLUE
GREEN/YEL
BLACK
Normal Alt
WIRE COLOR
WHITE
GREEN
Warning
For your protection, please read the following:
Water and Moisture:Appliances should not be used near water
(e.g. near a bathtub,washbowl, kitchen sink, laundry tub,in a wet
basement, or near a swimming pool,etc.) Care should be taken so
that objects do not fall and liquids are not spilled into the enclosure
through openings.
Power Sources: The appliance should be connected to a power
supply only of the type described in the operating instructions or as
marked on the appliance.
Grounding or Polarization: Precautions should be taken so that
the grounding or polarization means of an appliance is not defeated.
Power Cord Protection: Power supply cords should be routed so
that they are not likely to be walked on or pinched by items placed
upon or against them, paying particular attention to cords at plugs,
convenience receptacles, and the point where they exit from the
appliance.
Servicing: To reduce the risk of fire or electrical shock, the user
should not attempt to service the appliance beyond that described in
the operating instructions.All other servicing should be referred to
qualified service personnel.
For units equipped with externally accessible fuse receptacle: Replace fuse with same type and rating only.
Electromagnetic Compatibility
Operation is subject to the following conditions:
•This device may not cause harmful interference.
•This device must accept any interference received,including
interference that may cause undesired operation.
•Use only shielded interconnecting cables.
•Operation of this unit within significant electromagnetic fields
should be avoided.
SR823 / SR834
INTRODUCTION
The DOD SR834 is a stereo 3-way, mono 4-way crossover, and the SR823
is a stereo 2-way, mono 3-way crossover. These high-quality crossover
networks are designed to extract maximum sound quality from your multiamped sound system at a price working musicians can afford.
Accurate 24dB/octave Linkwitz-Riley state-variable filters prevent peaks or
dips in the output at crossover points, ensuring good driver protection by
rolling off crossover frequencies rapidly.
A 4-pole, 24dB/Octave Butterworth filter may be electronically inserted at 40
Hz using a switch on the front panel (834 only), and a variable low frequency
summed output is available for mono subwoofer applications.
The rear panel of the SR834/SR823 is clearly labeled for stereo and mono
operation, and all outputs on the SR834 except the mono Low Frequency Sum
output include phase switches.
ADVANTAGES OF A MULTIPLE AMPLIFIER SYSTEM
Multi-amped systems use separate amplifiers for each frequency band,
allowing each amplifier to deliver maximum efficiency within a specified
range. This method of amplification yields a cleaner overall sound and a
significant decrease in the amount of power needed to drive the system to the
same levels as a full-range amplified system with more power.
The greatest power demands in a sound system are made by the low
frequencies of the program material. This is because music and voice signals
contain mostly low frequency information, and low frequency drivers are
generally less efficient than high frequency transducers.
In a multi-amped system, the power amplifier(s) for the low frequencies can
be large enough to handle greater power demands, allowing high frequency
power amplifiers to be much smaller, yet adequate to handle the demands of
the high frequency content of the program material. Since each element of
the system is driven by its own amplifier, any distortion that occurs is limited
to the frequencies of the overdriving power amplifier. The rest of the signal
remains clear and undistorted.
Also, since lower priced, smaller amplifiers can do the job of the larger and
much more expensive amplifiers needed to drive full-range amped systems,
the cost of a sound system can be significantly reduced (and sound better in
the process). It may also be easier to haul several smaller power amplifiers
around, rather than one big one, making portable systems easier to handle.
SR Crossover
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