•Check that the interconnect cables to the ampliÞer 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 preampliÞer di- rectly on top of the ampliÞer.
•If the hum is heard from within the ampliÞer 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- pliÞer to another shelf.
•Try moving your preampliÞer further away from your ampliÞer. Sensitive preamp circuits may pick up hum from the ampliÞer trans- former’s magnetic Þeld.
•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 efÞciency speakers, these may show up noise which other speakers may not.
•If you are still having a problem, remember that SunÞre’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 preampliÞers have controls which can direct all the bass to subwoofers, or let your main speakers play the full range. Make sure that the preampliÞer has been correctly set. If you are not using a subwoofer, set the speaker options to “Large.”
•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 ampliÞer, and the neg- ative of each speaker connects to a negative output. If one speaker is wired incorrectly, than it will be “out of phase” with the others, resulting in poor bass performance.
•If you have connected the ampliÞer 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 ampliÞer into an unswitched AC outlet, and use the
Current source outputs not working
•If you are biamping or biwiring, make sure that the current source fuses have not blown.
•If these fuses blow often, it is acceptable to replace with a
APPENDIX
17
User's Manual