Mackie SRM450v3 Руководство по эксплуатации онлайн [15/20] 758095
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• Make sure there is room behind the rear
panel to provide sufficient ventilation to
the heatsink.
Bad sound!
• Is it loud and distorted? Follow the
procedures described in the “Quick
Start” section to verify that the levels
are set properly.
• Is the input connector plugged com-
pletely into the jack? Be sure all
connections are secure. It’s a good idea
to periodically clean all electrical
connections with a non-lubricating
electrical contact cleaner.
Noise
• Make sure all connections to the active
speakers are good.
• Make sure none of the signal cables are
routed near AC cables, power trans-
formers, or other EMI-inducing devices.
• Is there a light dimmer or other SCR-
based device on the same AC circuit as
the SRM450? Use an AC line filter or
plug the SRM450 into a different AC
circuit.
Hum
• Turn the LEVEL control all the way
down. If the noise disappears, it’s
coming from the signal source. If not,
try disconnecting the cable connected to
the INPUT jack. If the noise disappears,
it could be a “ground loop,” rather than
a problem with the SRM450. Try some
of the following troubleshooting ideas:
• Use balanced connections throughout
your system for the best noise rejection.
• Whenever possible, plug all the audio
equipment’s linecords into outlets which
share a common ground (see the diagram
on page 13). The distance between the
outlets and the common ground should
be as short as possible.
Never remove the ground
pin on the power cord of
the SRM450 or any other
component. This is very
dangerous.
• The hum may appear when using an
unbalanced source (consumer preamp,
CD player, VCR, etc.). This is caused by
shield
12
3
XLRRCA
3-Conductor Cable
the unbalanced-to-balanced interface
between the devices (and exacerbated
by the fact that most consumer audio
equipment have a two-wire linecord,
without the third-pin safety ground).
Use an interconnect cable wired as
shown below. The important point is
that the shield and the wire from the
XLR pin 3 are joined at the RCA
(source) end.
• Disconnect any cables which come in
from outside, such as cable TV, satellite
TV or roof top antennas. They must be
disconnected from every part of your
system, such as the TV, VCR and
preamp. If the hum goes away, you can
add a “ground loop isolator” in your
cable line. This is an inexpensive device
available from video or TV dealers, or
you can make your own from two TV
baluns (standard TV 75/300 ohm
adaptors):
The baluns are threaded at one end
(75 ohm) to fit TV coax cable and have
two wires at the other end (300 ohm).
They will not affect the video quality.
• If the hum persists, try removing compo-
nents one at a time from the back of the
mixer or preamplifier, and check for hum
each time (turn off your equipment before
you undo any connections). It is fairly
common to find more than one problem.
• If your preamp or mixer are the only
things connected to the SRM450s and
the hum is still there, try different
connection cables, or move the preamp/
mixer to another location.
• Pressing the LOW CUT FILTER may
help reduce the hum if you have trouble
finding the cause of the problem. Do this
anyway if you do not need to reproduce
the lower frequency range.
join (+insulate)
Balun
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Содержание
- Caution avis 2
- Portable cart warning 2
- Safety instructions 2
- According to osha any exposure in excess of these permissible limits could result in some hearing loss to ensure against potentially dangerous exposure to high sound pressure levels it is recommend ed that all persons exposed to equipment capable of producing these levels use hearing protectors while this unit is in operation ear plugs or protectors in the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure is in excess of the limits set forth here 3
- Contents 3
- Don t forget to visit our website at www mackie com 3
- Duration per day sound level dba typical in hours slow response example 8 90 duo in small club 6 92 4 95 subway train 3 97 2 100 very loud classical music 1 102 1 105 tami screaming at adrian about deadlines 0 110 0 5 or less 115 loudest parts at a rock concert 3
- Exposure to extremely high noise levels may cause permanent hear ing loss individuals vary considerably in susceptibility to noise in duced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time the u s government s occupational safety and health administration osha has speci fied the permissible noise level exposures shown in this chart 3
- For more information about this and other mackie products 3
- Lend me your ears 3
- The srm450 can produce a maximum spl of 127 db 1m 3
- Introduction 4
- Hookup diagrams 6
- Quick start 6
- Srm450 stereo operation with a mixer and using the thru jack 6
- Dynamic microphone 7
- For microphone connections you can daisy chain up to two srm450s using the thru jacks as shown take great care to point any micro phones away from the srm450s otherwise you may get feedback 7
- Srm450 biamping with a powered subwoofer 7
- Srm450 using a microphone and the thru jack 7
- The srm450 can be used with a mackie swa1501 or swa1801 subwoofer to create an in credibly powerful system the active crossover inside the swa1501 splits the full range input signal into two ranges the swa1501 plays the low frequency range through its 500 watt ampli fier and 15 inch woofer and sends the high pass range to the srm450 the srm450 can be pole mounted on top of the swa1501 as shown saving the cost of a tripod stand 7
- Thru output 7
- Rear panel description 8
- Connections 10
- Placement 10
- Room acoustics 10
- Both sides back 11
- Bottom top 11
- Pole mount 11
- Rigging 11
- Rigging points 11
- Ac power considerations 12
- Thermal considerations 12
- Srm450 ac connections 13
- Service information 14
- Troubleshooting 14
- Warranty service 14
- Big print 16
- Care and maintenance 16
- Repair 16
- Construction features 17
- Control system function 17
- Disclaimer 17
- Line input power 17
- Options 17
- Physical properties 17
- Power amplifiers 17
- Safety features 17
- Srm450 specifications 17
- System specifications 17
- Transducers 17
- Mackie srm450 block diagram 060322sedf 18
- Srm450 block diagram 18
- Please keep your sales receipt in a safe place 19
- Srm450 limited warranty 19
- Loud technologies inc 20
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