Troubleshooting Guide; No Sound (From One Or More Speakers Connected To The Mps-1); The Amplifier Shuts Down Often Or The Line Fuse(S) Blows Often; Poor Bass Performance From Full Range Speakers Connected To The Mps-1 - Emotiva MPS-1 User Manual

Troubleshooting Guide

The Emotiva MPS-1 is expertly designed and built to provide years of trouble-free performance. Most
problems that occur can usually be solved by checking your setup or making sure that the audio
and video components connected to the amplifier are on and fully operational.
The following information will help you deal with common setup problems you may experience
during normal use of your unit. If problems persist, contact your Emotiva Dealer for help.

No Sound (from one or more speakers connected to the MPS-1)

• Speaker cables may have come undone. Turn off your system and check the cables, and tighten the
amplifier and speaker binding posts.
• Damaged audio cable.
• The preamplifier volume level is low for the channels concerned. Recheck the preamplifier calibration
procedure.
• A preamplifier Mute switch may be on, or an external processor loop or a tape monitor loop is en-
gaged.
• Check that your preamplifier or source is running the correct surround sound mode. Maybe it is set for
2-channel stereo when you were expecting 5.1 surround sound.
• Check in case any missing channels have been turned off in a preamplifier setup menu. For example, the
center amplifier channel will not receive a signal if the preamplifier has been set to "Phantom."
• The Auto/on/off switch on the MPS-1 might be in the off position.
• A fuse on the unit may have blown or the individual fuse within the power module may have blown.

The amplifier shuts down often or the line fuse(s) blows often

• Check that the positive and negative speaker wires are not shorted together.
• Make sure that no speakers are shorted internally. If you have an ohm-meter, disconnect the speaker
wires and measure the resistance between the speaker's positive and negative terminals. If the read-
ing is less than 2 ohms, the speakers may have an internal short. Measure all speakers and check their
impedance specifications.
• If you have connected speakers in parallel, the overall impedance may be too low. It is recommended
that you rearrange the speakers in series to increase the overall impedance, thus taking some of the
load off the amplifier.
• Make sure that the amplifier has good ventilation and is not overheating. Allow good airflow under-
neath wherever possible. If the amplifier is in a closed rack, open up the rear panel or use a quiet fan
for improved ventilation.

Poor Bass Performance From Full Range Speakers connected to the MPS-1

• Make sure that your preamp does not have the bass (tone control) level turned down.
• Many surround preamplifiers have controls which can direct all the bass to subwoofers, or let your main
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