Setting the signal delay is fairly straight forward. Measure the distance of each speaker to the position of
your head in the car. Then add delay distance to each speaker so the apparent distance to each speaker
is the same. Of course in almost all vehicles the farthest speaker will be the woofer and you will need to
make all other speaker distances match the woofer distance as below.
150
120
100
70
50
40
30
+30
+50
+80
+100
+110
+120
It’s easy to see that the woofer is the farthest speaker. So we
add to the others to bring they’re distance out to equal that
of the woofer.
After we add the delay all the drivers will have the apparently
the same distance from the listeners head. The problem remains though that the woofer may still sound
like it’s coming from the back of the car. The villain here is the wavelength of the bass notes from the
woofer. Bass notes are very long, often longer than the car and it can be difficult to get the wave to arrive
at the right time.
After you set the delay you should try two things to help bring the bass forward.
First: Reverse the phase of the woofer. Listen first 0
°
and then change the phase 180° and listen again.
Listen for solid mid-bass as well as deep bass. Use the phase that works best in your car.
Second: Move the woofer farther away from the listening position. You do this by adding an equal
amount of delay to every channel
except
the woofer. You can use your presets for this.
Save completed settings to preset 1.
Then add 5ms to every channel (except the woofer) and save to preset 2
Then add 7ms and save to preset 3
Then add 9ms and save to preset 4
You may have to try it several times but you will likely find that one delay setting will make a big difference in
the
apparent
location of the woofer.
Bringing In the Woofer
20
