Crossover settings mb quart 600.4 advice?

[Amart88]

I'm about ready to hook up my 4 channel in a bit. It's been a loooong time since I worked with any newer 4 channels. I am running one set of RCA's from the HU front output. They will be split with 2 y-splitters to the amp.

I am running (1) pwx 6 and (1) pwx 8 on each of the first 2 channels at 2 ohms. channel 3 and 4 will have a ft1 tweeter each at 4 ohm.

The x-over settings have a selector for LP/BP, HP and FULL the other switch for channel 3 and 4 is Dupe, HP and Full.

In LP/BP mode the high pass acts as a subsonic filter (10-1.2khz) which is fine for my lower cut off but in that setting, the low pass acts as the upper cut off, it only goes to 150hz.

If I use the HP setting I can't have an upper cut off only a high pass.

Need some help. I read the manual and confused myself.

Thanks.