Ok I hope you guys knowledgeable in car amps/set-ups can school/explain a feature on a JL amp that I never saw before and if I should even use at all.

Ok here is my set-up i just finished my pre-install. If pix come out to big i apologize.
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Mids/Highs (front and rear) why? i got a deal (299.99msrp/i got for (170/pr) i couldnt pass up


Product Highlights:
component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
6-3/4" Plus One+ glass-fiber woofer with hi-roll rubber surround
adapter rings included for 6-1/2" openings
3/4" edge-driven soft dome tweeter
Starfish™ mounting brackets for easier tweeter installation in factory locations
2-way external crossover network
2-ohm impedance
tweeter adjustment circuits (0, +3 dB)
power range: 5-90 watts RMS (270 watts peak power)
frequency response: 45-35,000 Hz
sensitivity: 93 dB
woofer top-mount depth: 2-1/8"
warranty: 3 years
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(mids/highs) Amp JL 300/4 v2 (was given to me from a good friend) MSRP was 559.99 new.


Power: 75watts x 4 @2 ohm
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Sub:

Alpine Type E 10" (lower line alpine but all i was looking for was an 8. I was gifted this as well)


Stats:

Features and Specification

SPECIFICATIONS

Power Handling
Power Range: 100W-250 Watts
RMS Power Handling: 250 Watts
Peak Power Handling: 750 Watts
Dimensions
Mounting Depth: 135 mm (5.3'')
Mounting Diameter: 228 mm (9'')
Displacement: 0.055 cu. ft. (Front Mount)
Added Volume: 0.061 cu. ft. (Reverse Mount, Magnet Out)
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Sub amp:

Coustic 320QE (I bet youre like "who". I did too. I was told it was a side line of MTX_


Stats:

- Triple Darlington Drive Circuitry
- Adjustable Bass Boost
- Built-in HPF / LPF with Continuously Adjustable Crossover Frequencies
- Remote Subwoofer Level Control Ready
- Switched RCA input
Rated Power @ 14.4 V (0.1 % THD) 4 Ohm Stereo: 4 x 40 Watts
Rated Power @ 14.4 V (0.1 % THD) 2 Ohm Stereo: 4 x 80 Watts
Rated Power @ 14.4 V (0.2 % THD) 4 Ohm Mono: 2 x 160 Watts
Input Sensitivity: 0.1 - 5 V
S/N Ratio @ rated power: 100 dB
High-Pass Filter Crossover Frequency: 30 - 300 Hz (Continuously Variable, @ 18 dB/Oct.)
Low-Pass Filter Crossover Frequency: 30 - 300 Hz (Continuously Variable, @ 18 dB/Oct.)
Bass Boost Level: 0 - 18 dB @ 45 Hz


Now here is my question on a feature on the Alpine app that ive never seen and what to even do with it. Thanks to my fit brothers/sister in advance.

Here is the JL amp from the side.


Heres my question. What is slope (Slope 12db/24db) for and when would/should I use it and which slope would u recommend for me set-up?

Again thank you for all of your opinions and direction.

 

The filter slope is how sharply the high pass/low pass filter cuts off. I believe you'd probably use the high pass mode, setting the frequency for your subwoofer/main driver crossover point. The 24 dB/octave cuts off more sharply than the 12 dB/octave setting.

If you're using some other crossover for the subwoofer, you presumably don't need the filter at all and so the slope is immaterial.

 

Thank u. yes most ive read did 12. My sub amp has no slope control. so dont use the slope at all?