1- Phase: What is the phase? It shows in the diagram that it inverts the curve of the sound. THIS GIVES YOU A CHANCE TO BETTER LINE-UP THE ARRIVAL (AT YOUR HEAD) OF THE BASS FREQUENCIES WITH THOSE OF THE MIDBASS FREQUENCIES. IF THEY ARE 180 DEGREES APART, YOU HAVE CANCELLATION. THEN YOU FLICK THE SWITCH, AND THEY ARE ALIGNED. SET IT TO THE SETTING YOU LIKE BEST (USUALLY WHERE THE BASS IS MORE UP-FRONT)
a) Frequency 40-90 Hz: What should be optimum setting for JL W7? THIS DEPENDS TOTALLY ON YOUR ENCLOSURE AND THE RESPONSE IN YOUR CAR. IF YOU DON'T HAVE AN RTA, LEAVE THIS ALONE.
b) Level: I guess that depends on how much equiliser settings would I be imposing on the output? SET IS TO YOUR LIKING, OR UNTIL IT BLENDS WITH THE REST OF THE SYSTEM. START ALL THE WAY COUNTERCLOCKWISE AND WORK CLOCKWISE.
3- Subsonic filter: 0-40 Hz: what sort of settings should I be looking at? IF YOU HAVE A SEALED BOX, LEAVE IT OFF, IF PORTED, SET IT TO 20-25HZ. THIS IS TO PROTECT THE WOOFER FROM PLAYING FREQUENCIES THAT CAN POTENTIALLY HARM IT.
4- Lo 24db: 50-200Hz: What is this? I have some idea but do not want to feel guilty if I put wrong things here. What sort of settings are best? THAT IS IS THE LOW-PASS FILTER. IT DEPENDS ON THE SIGNAL YOU ARE GETTING...IS IT ALREADY LOW-PASSED? IF NOT, SET IT AT 60-80HZ, WHICHEVER WORKS BEST FOR YOU.
Mobridge DA2 > JBL MS-8 > JL Audio HD600/4 > (3) Hybrid Audio L3SE & (2) Rainbow Cal25; JL Audio HD900/5 > (2) Morel HCW-10 & (1) AE SBP15