User`s manual

7
Poor sound
• Isitloudanddistorted?Makesurethatyou’renot
overdriving a stage in the signal chain. Verify that
all level controls are set properly.
• Istheinputconnectorpluggedcompletely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loudspeak-
ers are good and sound.
• Makesurenoneofthesignalcablesareroutednear
ACcables,powertransformers,orotherEMI-induc-
ing devices.
• IstherealightdimmerorotherSCR-baseddevice
onthesameACcircuitastheSA1521z?UseanAC
line filter or plug the SA1521z into a different AC
circuit.
Hum
• TrydisconnectingthecableconnectedtotheMAIN
INPUTjack.Ifthenoisedisappears,itcouldbe
a “ground loop,” rather than a problem with the
SA1521z. Try some of the following troubleshooting
ideas:
◊ Usebalancedconnectionsthroughoutyour
system for the best noise rejection.
◊ Wheneverpossible,plugalltheaudioequip-
ment’s linecords into outlets which share a common
ground. The distance between the outlets and the
common ground should be as short as possible.
SERVICE INFORMATION
If you think your Mackie product has a problem,
please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
sectionofourwebsite(www.mackie.com/support)
where you will find lots of useful information such as
FAQs, documentation, and user forums. You may find
the answer to the problem without having to send your
Mackie product away.
Troubleshooting
No power
• Ourfavoritequestion:Isitpluggedin?Makesure
the AC outlet is live (check with a tester or lamp).
• Ournextfavoritequestion:IsthePOWERswitch
on? If not, try turning it on.
• IsthePOWERLEDontherearpanelglowing
green? If not, make sure the AC outlet is live. If so,
referto“Nosound”below.
• TheinternalAClinefusemaybeblown.Thisisnot
a user serviceable part. If you suspect the AC line
fuseisblown,pleaseseethe"Repair"sectionnext.
No sound
• Istheinputlevelcontrolfortheinputsource
turned all the way down? Verify that all the volume
controls in the system are properly adjusted.
• Isthesignalsourceworking(andmakingunion
scale)? Make sure the connecting cables are in good
repair and securely connected at both ends. Make
sure the output volume (gain) control on the mixing
console is turned up sufficiently to drive the inputs of
the speaker.
• MakesurethemixerdoesnothaveaMuteonora
Processorloopengaged.Ifyoundsomethinglike
this,makesurethevolume/gainisturneddown
before disengaging the offending switch.
• IstheTHERMALindicatorlitredontherearpanel?
Make sure there is at least six inches of free space
behind the SA1521z.
Poor bass performance
• Checkthepolarityoftheconnectionsbetweenthe
mixer and the loudspeakers. You may have your
positive and negative connections reversed at one
end of one cable, causing one loudspeaker to be
out-of-phase.