Sunfire TGA7401 - Manual (Page 17)

User's Manual
17
APPENDIX
• Check that the interconnect cables
to the amplifier do not have any
broken connections.
Other causes of noise
• Speaker noise may also be caused
by interference or noise on your
AC line. Make sure there are no
large appliances sharing the line,
or halogen lamps or lamps with
dimmer controls.
• Try connecting your system to an-
other AC socket on a separate line.
• Keep power cords away from au-
dio cables.
• Do not place the preamplifier di-
rectly on top of the amplifier.
• If the hum is heard from within
the amplifier and not through the
speakers, this may also be caused
by interference on the AC or DC
lines. The power transformer
may turn this interference into an
audible noise. Internal hum can be
made worse by a shelf or cabinet
resonating, so try moving the am-
plifier to another shelf.
• Try moving your preamplifier
further away from your amplifier.
Sensitive preamp circuits may pick
up hum from the amplifier trans-
former’s magnetic field.
• Try moving your components further
away from the TV, especially if
you ever notice the screen has
changed color in the area closest
to the component.
• If you have very high efficiency
speakers, these may show up
noise which other speakers may
not.
• If you are still having a problem,
remember that Sunfire’s dealers
and technical support staff will as-
sist you. Make a list of the things
you have tried.
Poor bass performance
• Make sure that your preamp does
not have the bass level turned
down.
• Many surround preamplifiers have
controls which can direct all the
bass to subwoofers, or let your
main speakers play the full range.
Make sure that the preamplifier
has been correctly set. If you are
not using a subwoofer, set the
speaker options to “LARGE,” and
the subwoofer to "OFF."
• Check that the speaker wires have
been connected correctly: Make
sure that the positive of each
speaker connects to a positive out-
put of the amplifier, and the neg-
ative of each speaker connects to
a negative output. If one speaker is
wired incorrectly, then it will be “out
of phase” with the others, resulting
in poor bass performance.
• If you have connected the amplifier
using the XLR inputs, make sure
that the XLR cables are wired cor-
rectly. If one has the hot and cold
reversed, then this will also cause
a speaker to be out of phase.
Turn-on and turn-off
thumps
• Plug the amplifier into an
unswitched AC outlet, and use the
AUTO-ON feature. This will allow
the amplifier to turn on and off
silently.
Current source outputs not
working
• If you are biamping or biwiring,
make sure that the current source
fuses have not blown.