I have Focal 165v2 Slims in front and JL10W3 in the stealthbox driven by a 9835. JL300/2 to the fronts and JL250/1 to the sub.

Alpine's instructions say to "make crossover adjustments according to the recommended crossover frequency for the speaker". Neither Focal or JL list those specs on their website. However, I do see frequency response charts for the Focals that show the following:

Bottom Peak Top
Tweeter 100Hz 1-20KHz 20KHz
Woofer 20Hz 100-3000 20KHz

My interpretation is to set crossovers as follows:

Highpass - 1KHz
Bandpass - 100Hz to 3KHz
Lowpass - 200Hz (this appears to be the max upper
limit from Alpine's instructions)

Is this a reasonable starting point?
I assume I then fine tune to my taste but not quite sure how to do it. For example, if I want the mids louder (which seems likely given these speakers are bright to begin with) do I extend the range on the bandpass ? Or set the upper on the bandpass to match low end peak on the tweeter ?

What about slope, how do I decide if it should be sharp or slow?

I realize this is subjective. I think my problem is I'm not clear if the upper and lower limits on the bandpass should match the pass frequency on the sub and tweeter or if it should "blend" and how much of the blending is the job of the slope adjustment.

Thanks guys!

 

How many amps? Specs?

Do you have separate amps for the focal tweeter and woofer?

Do the amp(s) have built-in crossovers?

 

JL300/2 to the fronts and JL250/1 to the sub. Yes, JL's website says there are on-board cross-overs:

Copy/paste from JL's website:

"On-board Crossovers:
250/1: fully variable (40-200 Hz), selectable-slope LP (12 or 24 dB per octave)
300/2: fully-variable (50 Hz-5 KHz), selectable-slope LP or HP (12 or 24 dB per octave)"

I did not know there were filters on the amps and unfortunately don't know if or how the installer set them. I will pull the amps and look but that will take some time.

Should I set the electronic xovers flat and use the on-boards instead?

It looks like the 300/2 can be set for hi-pass or lo-pass but not band pass which seems illogical when applied to the woofers.

 

Forget about bandpass, it does not apply to your setup.

Without knowing what the xovers are set to on the amps, you're better off leaving the xover flat at the HU. It's definitely possible to play around with different xover frequencies at the HU and use your ear to figure out where the amps are xover'ed but it wont' be easy.

Is there something about the sound that you don't like?

If the tweeters are too bright then you should first look at the focal crossover that comes with the speakers (it's probably installed in the door), it has an adjustment for the tweeter level that you can use to turn the tweeters down.

 

I just want to pull up the mid range. I don't might the brightness but the mids seem flat by comparison.