How do I hook up two powered 15's and two passive 15's to this mixer(1202-VLZ3)?

Sub outs needs an active speaker.

An active speaker have a built in amplifier and preamplifier.

For a passive speaker it needs an amplifier.

Look here:

http://elektrotanya.com/mackie_1202-vlz_pro_schematic_diagram.pdf/download.html

Scroll down to "get manual" and click on it to download. IGNORE other download links.

You can, but I would not suggest it. Depending upon the input design of the powered sub, the highs might not get filtered out. Many subs assume that they are only receiving the lows. You are better off using a crossover between the mixer and the amp for highs and the powered sub for the lows. Please note that the crossover will give you much more control over the sound quality.

Dan

Download the schematic:

http://elektrotanya.com/mackie_1202-vlz_pro_schematic_diagram.pdf/download.html

On page 10 you will find the power supply. You will likely find a failure among the components:

D4, D5, D6, D7, C1 or C2

There could also be a circuit board crack around these items.

C1 or C2 is the most probable failure. They are 2200mfd/25 volt electrolytics.

select your model & download from
http://tv.manualsonline.com/ex/thread/view/idThread/2758098
you might be required to register yourself, go ahead its free

first, you will need a passive crossover, i do not believe that the mono out of the mixer has a crossover., if the amp does not have a crossover. you could use the "mono" output, and split the signal, with an adapter, to both channels of the crossover, then run both of the low outs to the 2 channels of the amp. or, you could hook the crossover to the main laft and right outputs of the board. send the 2 low outs, left and right, to the subs' amp, and send the two high outs, left and right, to the main speakers' amp.

111111111111111111111111111111111

Behringer uses 4580's in appropriate packaging everywhere. There are 339 comparators for the level indicator area.

The Mackies uses both NJM2068 and NJM4560M

The 2068' are used in most of the low noise areas and the 4560 is used in the 75Hz high pass filter for example.

The schematics don't show this, however reverse engineering this there are two windings... one is for the phantom power of 48 VDC... this winding needs to provide about 55 to 60 volts DC to the 48 volt regulator. EXPECT around 40 to 50 volts AC on this winding to the full wave bridge of D1,2,3,8.

The +/- 16 volt power regulated by LM317 and LM337 regulators will likely require about 20 volts DC into the regulators. It will be less than 25 volts because there is a 25 volt cap filtering.

Given a 20 volt DC from the diodes D5,6 and diodes D4,7 the transformer will be around 15 VAC either side of the centertap.

A minimum would be 12.5 VAC and say 18 VAC either side of center.

You should see near pure DC across C1 and C2 with only a little ripple of 2 volts MAX. The ripple should be 120 Hz. An oscilloscope is your friend in this area !!!

Without knowing the resources you are connecting I cannot give you a schematic but will give this GENERAL advice:

1. Use BALANCED lines to connect from the mixer to your amps, preferably XLR connections.

2. Service the power to the amps and the mixer from the SAME place even if it means stringing a power cable alongside you audio cable snake.