Rockville dB Series User Manual

6
Settings
Adjusting The System
1. Once the system is operational, set all crossover points to approximate settings. In the case of the basic sub woofer system, set the Low Pass lter crossover at 100Hz or so. Set the
bass equalizer controls to 0 dB. Turn the controls using a small at head screwdriver. Do not apply any pressure while turning as this might break the control unit.
2. Now set the amplier’s Input Sensitivity adjustment. The control(s) accessible on the side of the amplier marked LEVEL or INPUT LEVEL adjusts the input sensitivity. Turn it counter
clock wise to the MIN position. Adjust your head unit’s volume level to maximum. Now, turn the level control on the amplier clockwise (towards the MAX position) until audible distortion
occurs. When you begin to hear distortion in the sound, back down one notch and your amp is set. It is helpful to have a second person to help you set the gain. When setting up a multi-
amp system, set each amplier’s level controls separately. Start off with the bass amplier, then adjust the highs amplier’s level control to match. Please note that the level control of any
car amplier should not be mistaken for a volume control. It is a sophisticated device designed to match the output level of your source unit to the input level of the amplier. Do not adjust
the amplier level to maximum unless your input level requires it. Your system can also be extremely sensitive to noise when the LEVEL is set to maximum and does not match your input
signal. These adjustments need to be made only once when rst setting up the system.
3. Once you are satised with the level control settings, use any equalizer controls to adjust the system tonal level for personal preference. Keep in mind that after equalizing, you may
have to go back and reset the amplier’s level controls.

If your unit has been professionally installed please do not change the gain settings set by the installer, he is the professional!
Audio Preamp Input
The dB Series ampliers feature RCA pre amp inputs. Run RCA cables from your sound source to the amplier inputs. We suggest you use high quality, shielded RCA patch cords to help
reduce and eliminate unwanted electrical noise to your system. Use good quality RCA interconnect cables. Cheaper cables usually have poor shielding that can cause interference pickup.
Be sure to run the RCA cables on the side of the vehicle opposite to the side used to carry the power and ground leads of the amplier.
Using The Built-In Low Pass Electronic Crossover
All the dB Series ampliers feature 12dB per octave fully adjustable low-pass and high pass electronic crossovers.
For Low Pass sub woofer systems the knob marked LOW PASS will control the low pass frequencies from 50Hz – 250Hz. A frequent error made is setting the low pass frequency too low,
especially when using vented sub woofer enclosures. We recommend that for most installations you do not set the frequency knob lower than 80Hz.
Using The Subsonic High Pass Filter
Subsonic frequencies are very low and can cause damage to your subwoofers. The Subsonic HPF is a high pass lter which will allow you to attenuate any frequencies below the set limit.
Sealed Enclosures: Sealed boxes are tuned by enclosure volume; larger enclosures tune lower, smaller enclosures tune higher. Subsonic frequencies can cause damage to your woofer
as they cause it to play below the enclosure’s tuning, forcing it to the limits of its excursion and making it expend a lot of energy. To avoid damage to your woofer set the Subsonic HPF
to 25 – 35Hz.
Ported Enclosures: The enclosure’s port should be tuned to a certain frequency so that the enclosure is capable of playing all frequencies above that tuning. The enclosure can play below
that frequency, but only half and octave before the cone starts to over-extend. Hence, set the Subsonic HPF to 1/2 an octave below the tuned frequency.

Rockville dB Series Specifications

General

Brand	Rockville
Model	dB Series
Category	Amplifier
Language	English