X1 POSITION:
•Setting for Factory (OEM) Source Units: To check the amount of voltage that is present from the source unit, take a multi meter, or a volt/ohm meter, on the AC setting, (range from 100mV up to 10 volts) attach the positive and negative leads directly to any exposed speaker. It will not matter if the polarity is correct, it will read the same amount of voltage.
X10 POSITION:
Note: It is important not to have the amp set up to receive a low voltage signal and give it a high voltage signal. Doing this can cause damage to the amp.
2.Adjusting the Gain Control – Before you start setting your amp gains, be sure to defeat all EQs (“off” position). You want to set the gain levels properly BEFORE applying any equalization.
Start with the source unit’s volume around ¾ of the way up, and the gain on the amp all the way down (counter- clockwise). Slowly increase the gain clockwise until the speaker starts to distort. Immediately decrease gain until the distortion goes away. This will be a good reference point on the volume control to where the signal starts to distort. Remember every CD will be different; use common sense and constantly listen for obvious distortion and adjust volume accordingly. The gain on the amp has nothing to do with how much power the amp can produce, just how fast the amp puts out max power. Just like in an automobile, full throttle is very rarely needed.
Note: When adjusting the gains for two amplifiers strapped, you must adjust each amplifier’s gain, frequency, and EQ so you will be able to “match” the two amps and ensure both amplifiers are sending the same ac voltage to the woofer. This will require source materials that include test tones and a volt ohm/multi meter.
a)Set the volume around half, play a flat tone
b)Set your multi meter on ac voltage and connect it to the Positive amplifier’s positive and negative output terminals.
c)Switch the multi meter between the amps and make the necessary adjustments so that the flat tones produced match. If you have access to two multi meters, simply place one on each amplifier’s terminals and make the adjustments.
3.Adjusting the Low, 24dB @ 40Hz - 200Hz Variable Low Pass
• Setting for Subwoofers: Using
4.Setting the
5.Adjusting the Parametric Equalizer – In some applications, the bass amplifier needs some help in boosting or cutting certain frequencies. A parametric equalizer is distinguished from a conventional equalizer circuit in that it allows the user to control the level of the boost or cut as well as the center frequency and the bandwidth of the boost or cut (the range of frequencies affected).
The following steps describe what each of the three controls of the parametric Bass EQ do in isolation. It is important to understand these behaviors, because they must all be considered when setting up the EQ.
•Setting the “Q”: The “Q” feature can be adjusted to affect a range of frequencies from as wide as 0.5 to as narrow as 4.0. As a general rule of thumb, start tuning with a “Q” setting below “2”. Higher “Q” values are rarely needed unless there is some truly bizarre acoustic problem in the system. Lower “Q” values give you a broader (and usually more