What should I set my Level control/Bass Boost/Subsonic Filter/Low pas filter/Phase shift control?

Question

I have a Lanzar Opti 4000D Amp. I'm running the amp on 2 12" Lanzar subs 1100 rms per sub. I ran the amp 8ohms and then into 4ohms. But need to know where I should set the bass boost, Level control, Subsonic filter. And not sure about the low pas filter and the phase shift control. I have the subs in a sealled box, they are hitting nice but I'm scarred to turn the volume to load from not blowing them. I just played with the settings and go the level control at 1/4. Can anyone help????

Answer 1

Let's start with the easy stuff.

The phase control. You should keep it set to 0 degrees, or in phase.

The crossover. Anywhere between 30 and 80 is fine in my book. I usually keep mine set around 50 hertz. I don't really like much of the "high" bass. Just play around with it a little and see what sounds best to you.

Now for the gains and bass boost. The best way I know set the gain control, is the multimeter method. You'll need a few things. A digital multimeter and a 50-60 hz test tone. You can get a 50hz tone from the download page of this site. http://www.realmofexcursion.com/

1) Turn everything that controls the subs to zero. Bass on the head unit, boost on the head unit, sub volume on the unit, etc. Do the same for the amp, gain to zero and boost to zero

2) disconnect the subs from the amp.

3) Play the test tone on repeat at about 3/4 of the head unit's total volume. If you have a way to cancel the amps for the mids and highs, go ahead and do it. I usually do just to keep it quiet while i'm trying to concentrate.

4) set the multimeter to volts AC. then connect the test leads to the speaker outputs. Red to positive and black to negative.

5) Now slowly turn the gain up until you reach the target output voltage. In your case, you would be looking for an output voltage of 80 volts AC if you're running a 4 ohm final load or 56.57 volts at 8 ohms.

To figure out the output voltage yourself, use this formula.

It is the square root of the wattage times the resistance. It goes like this. 1600 x 4 = 6400. and the square root of 6400 is 80. There is the target voltage.

Follow these steps, and the gains will be set perfectly.