zapco DSP-Z8 IV II Owner's Manual page 22

The vertical Link ( 8 ) column in the picture below allows linking of crossovers, delay, and gain.
To link the channels, you pick a channel from the Ch. Outputs column (i.e. ch. 1), then you
click the channel you want to pair (i.e. ch. 2). Now the parameters you set for Ch1 will also be
set for Ch2. When you choose the next channel (i.e. ch. 3) the current link will be broken, and you
can now pair Ch4 with Ch3 and set the next crossover. NOTE: Any time you select a channel
from the Ch. Outputs column any active links will be broken.
10 9 8
Phase (Polarity)
With the crossovers and delay set the next step to a correct sound stage is to check the phase
of the system. The first step in this is to assure that during installation the positive to positive
and negative to negative speaker wiring was connected correctly. However, because of the
nature of car interiors it is still possible that you could be acoustically out of phase. There are
several methods of checking phase that you can research. We offer one here.
System phasing can be a pretty long procedure if you haven't done it before, but it is critical
to having a good sound stage and frequency response, so take your time.
Tools needed: Music source with high female vocal solo. Music Source with strong male vocal
solo. Music Source with strong mid-bass (like kick drums).Mute Buttons: At the upper right
section of the GUI you will see a row of ( ) buttons. When you turn on a channel MUTE,
Mute 9
that channel goes silent. You will use the Mute button to turn off the channels you do not
want to hear while you are checking phase.
Quiet Please: Outside noise will distort what you hear in the car. You cannot make these (or
any) audio adjustments unless you are in a quiet environment. Especially during equalization
where you will risk long term damage to equipment by trying to compensate for outside noises.