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into a different AC outlet. Sometimes, if a different circuit (breaker) is used for the mixer and for the RBN™118
Sub, it can cause hum problems. Unless it is not practical, it is best to use the same wall outlet (breaker) to sup-
ply power to both the mixer and the powered speaker.
Ensure that shielded cables have been used to route the signal to the RBN™118 Sub input. If speaker cables with
1/4" plugs are used as input cables instead of shielded cables, they will be prone to hum or buzz.
Hum may be ground loop related. It may be helpful to lift the shield ground (Pin #1) on a balanced cable at the
RBN™118 Sub end. Check any input changes carefully by first turning down the Level control, before plugging
and unplugging cables, or lifting the shield ground at the speaker end.
Check to make sure light dimmers are not on the same circuit as the RBN™118 Sub, the mixer or any source
devices. If light dimmers are used, then it may be necessary to turn them full ON or full OFF to eliminate or re-
duce hum. This is a typical AC wiring/light dimmer interference problem, not a design flaw of the RBN™118 Sub.
The third wire (ground plug) on the AC plug should NEVER be removed or broken off, as this is a potential
safety hazard.
Distorted or Fuzzy Sound
First, ensure the mixer (signal source) is not clipping or being overdriven. Make sure the Gain (6) control on
the RBN™118 Sub has not been set too low. Check that the input plug is fully seated in the input jack on the rear
panel of the RBN™118 Sub. Ensure that a power amp has not been plugged into the input jack of the RBN™118
Sub. If an extension cord is being used to provide the AC power to the unit, insure that it is of sufficient current
capacity and that it is not also being used to supply power to any other device.
The RBN™118 Sub has built-in EQ to smooth and extend the natural response of the speakers. If excessive addi-
tional bass boost have been added externally to the RBN™118 Sub, it could cause premature overload at high SPL.
Reduce the amount of any external (mixer, rack) EQ and see if that clears up the distortion.
If no external bass boost has been added, but there seems to be an excessive amount of bass boost (boominess,
bass clipping, then you may want to try a different EQ Preset on the full-range satellite speaker used with the
RBN™118 Sub, try the Flat or Acoustic or Country Preset. Using Presets with a lot of bass boost on the full-range
satellite speaker can cause the sound to become boomy.
Setting the level of the full-range satellite speaker too low will also tend to cause a boomy sounding bass or mid-
bass.
Finally, realize that even though the RBN™118 Sub is a powerful and high output unit, it does ultimately have
limits, and it may need additional powered Sub units to provide enough low frequency sound output. In this
case, try turning the mixer levels down a little to see if that clears things up. If, after checking all the things listed
to check and anything else you can think of to check safely, and the system still exhibits problems, carefully note
all conditions and check with your Peavey dealer for advice.
Care and Maintenance
Your RBN™118 Sub is a sturdy and durable product and will provide years of reliable use if properly cared for.
Use common sense and read the safety warnings to avoid hazardous operating conditions.
The unit must be disconnected from the AC power source before any work is done on it. Refer all servicing to
qualified service personnel.
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