Set up
8
Before setting gain .....Adjust the crossover filters, since they are always on....you must set them up. Assuming you are
using the CVPO3K or 5K as a subwoofer amplifier adjust the LowPass Filter. Typically start at about 80-100Hz. This setting
allows ALL frequencies to pass to the subwoofers.
To adjust the gain setting, turn the amplifier gains all the way down (counterclockwise). If using the included Bass Remote
Level control plug the remote level control into the amplifier and turn it to about 1/2 way up. Next turn the source unit
volume up to almost full volume (usually about 2/3rds of the way up) or untill the output starts to distort on an
oscilloscope. This will be NEARLY full volume on most source units, perhaps one or two “clicks” down from maximum
volume. Next, increase the amplifier gain setting until adequate volume is achieved, or untill distortion is audible and then
turn it down a bit until the distortion is inaudible.
The HPF or LPF crossover adjustment can now be fine tuned. If you are using the amplifier in a HPF configuration and would
like the system to be a little bit louder you can increse the HP Filter frequency and reset the "Gain" of the amplifier. Raising
the HPF frequency up too high, however will cause a loss of mid range and bass. If you are using the amplifier in a HPF
filter configuration and you hear voice or vocals coming from your subwoofer system you can tum the Low Pass Filter
frequency down (lower).
After setting the input gain adjustment and crossover, you may choose to add a small amount of "Vega Bass Boost" in the
low frequency region. Remember that the Bass Boost feature will not fix a poorly designed subwoofer endosure or
subwoofers that didn't sound good to begin with. You’ll need to play with the Frequency also. Dependiong on the length
of your vehicle will change the boost frequency. Now would be a good time to use your RTA app on your phone.
For a Pro Audio “type” driver begin tuning with the frequency set between 60Hz - 100Hz.
Placing the switch in the LPF position sets the amplifier to the Low Pass Filter mode, enabling frequencies below the cutoff
point to pass. For a subwoofer system begin tuning with the frequency set between 80Hz - 120Hz.
NOTE: Ideal signal to noise and dynamic range are achieved with the gain at minimum. Most users find adequate gain and
volume is achieved at less than halfway in the adjustment range. Avoid setting the amplifier gain very high as noise and
distortion will increase significantly. For a more in depth level setting (gain adjustment) procedure AND system designs, visit
the CVM website.
1. Make sure any bass EQ, loudness or low frequency equalization from the source unit is set to OFF or FLAT.
2. While playing the same musical selections used during the gain setting process, slowly increase the level of the Bass EQ.
You should be able to notice a obvious change between 0 and +12dB. If you do not notice much difference, then it will not
serve any benefit to increase the boost further.
3. If the boost has audible benefits without adding appreciable distortion, find a level that suits your taste. Remember: it's
much easier to construct the right subwoofer enclosure for your listening preferences than relying on a bass boost control to
do the job!
