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Velodyne Optimum-12 Manual

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Optimum Series User’s Manual - 3
INSTALLATION
Inputs
Your new subwoofer is equipped with speaker-level and line-level inputs. Use the LINE LEVEL jacks when
connecting your subwoofer to a pre-amp, signal processor (such as LFE out), linelevel crossover, or receiver
with pre-amp level outputs. When using the line level jacks, some receivers may not provide enough signal to
have the unit’s auto-on feature operate properly. Additionally, this lack of signal may also cause the subwoofer
to produce less output than it is capable of.
To alleviate this condition, we recommend the following steps:
1) If using line level jacks, BOTH THE LEFT AND RIGHT INPUT SHOULD ALWAYS BE USED – never use
just the left or just the right input. If using line level connections from a preamp or signal processor, use
both Left and Right inputs from your preprocessor or preamp and connect them to the Left and Right
inputs on your subwoofer.
2) If using a receiver with LFE out, be sure the LFE channel is sending adequate signal to the subwoofer. The
subwoofer’s default volume setting is 30 on a 1-80 scale (roughly 1/3 volume). Adjust the LFE channel on
your receiver or processor to achieve the desired bass output. See your receiver or processor’s owner’s
manual for more information.
Volume Control
This control allows you to balance the output from the subwoofer to the main speakers in your system. This
control should be set to achieve similar output levels from both the main speakers and subwoofer when listening
to music. The default volume setting is 30 on a 1-80 scale.
Warning:
Some manufacturers preset their receivers with the Sub-Out channel signal at a minimum level. It is very important
to verify that your receiver Sub-Out channel is set to the same output level as your front right and left channels.
Refer to your receiver manual for the individual channel level adjustment procedure. If your receiver Sub-Out
channel is set too low, the subwoofer may appear to have a weak output, it may sound noisy or distorted, and
the Auto On/Off feature may not operate properly.
Low-pass Crossover - 40 to 135 Hz
All inputs sum the left and right channels together, with the resulting signal passing through an adjustable
low-pass crossover before being amplied. The crossover control allows you to adjust the upper limit of the
subwoofer’s frequency response from 40 to 135 Hz. The subwoofer’s response will begin rolling o above the
frequency you set this control to. You should set the crossover frequency to obtain a smooth and seamless
transition from the subwoofer to the main speakers in your system. If your main speakers are smaller with limited
low frequency output, you may wish to choose a higher frequency (such as 100 - 120 Hz) than you would with
larger speakers which have greater low frequency output. The default crossover setting is 80 Hz. With larger
speakers, you may want to set this even lower, for example 70 Hz.
… 9 …


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