CI-1255e™ Power Amplifier
Hafler
Passion for Perfection
11
eLImINATING GRouNd LooPS uSING AudIo GRouNd ISoLAToR
If all is well with the electrical outlets, but you are encountering noise, adding an isolation transformer module in between your preamp
and amplifier can help eliminate the noise. If you are only using the bus input on the CI-1255e, the easiest solution is to add a CI-9022
or CI-9024 into the Omniport. This is easily done by following the instructions that come with the module. Once installed, connect the
source to the isolation module input and enjoy the noise-free solution!
If you plan to use multiple sources, the same ‘start backwards’ rule applies. Add one source at a time and listen. If you encounter noise,
try introducing an isolation transformer in series between the source and the amp input. The Jensen CI-2RR is a wonderfully effective
device that will not deteriorate the audio quality.
Introducing a video isolator into your system
One of the most common noise makers is the cable TV connection. Your cable TV is not powered by your home electrical system, but
it is instead powered by a distant cable TV sub station. With two power sources, it is easy to understand how this can pose a problem.
To determine if a cable TV connection is responsible for the hum, first turn off all the components. Disconnect the cable TV feed to
your system. Turn your system back on, and listen if the hum has disappeared. If removing the cable TV feed has eliminated the hum,
you will need to insert a Ground Loop Isolator like the Jensen VRD-1FF before reconnecting the cable TV feed. These are effective at
stopping hum and will pass analog and digital signals without hampering the performance.
WARNING
If you are hearing distorted sound, turn the volume down immediately. Check to make sure the speakers are in proper working
order and no faults are found with the cables. Failure to head this warning could result in speaker and/or amplifier damage that
is not covered by the warranty. If this problem persists, contact your dealer.
WARNING
If you suspect that the grounding system in the home’s electrical wiring is causing the hum problem, it is important that you do not
make any changes to the wiring yourself. Only a licensed electrician should make any changes to household wiring and they must
be made in full compliance with all local building, safety and electrical codes.
Summary of Contents for CI-1255e
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