How good is the crossover in your loudspeakers?

On an Lpad, there are two floating wipers, but only one is shown in the schematics.  We are using the other and it goes from ~11 to ~36 ohms before it opens completely.  The circuit works best above ~18 ohms, hence R2, with ~20 ohms being near optimal.

If you saw the frequency response of the JBL 2251J, the circuit would make more sense.

I want to roll it off at about 2,500 Hz but that peak at ~3kHz makes this near impossible to do cleanly.  I had to come up with some very imaginative thinking and a bit of luck from experimentation to make this work!

What I do is to roll it off a bit earlier by "over capacitating" it.  If you use too much capacitance in a second order low pass filter, you will greatly increase the slope but also  create a hump just below the roll off point.  The more capacitance, the bigger and lower the hump.  The shape of the rising hump is obvious with the Lpad is turned full up (open).

But I also let some of the signal pass through R1 or R2/VR1.  This portion of the signal is NOT IN PHASE with the hump and the more you let through, the lower the hump becomes until you have a fairly smooth response up to the ~2,500 Hz roll off point.  VR1 lets you selectively tune the hump.

Imo and decades in audio and modding my equipment as well as 

ally Loudspeaker Xovers. Your speakers Xover on 85% of speakers is at best average my focal Sopra aat over $20 k have cheap. Xoverparts 

inductors instead of say a $$50 copper foil ,theyhave a $10 sledgehammer iron with wire wrapped around it Solen capacitors $3 resistors what a disgrace .

i just bought a pair of Qualio ultra Loudspeakers under $23k 

land built better then $30k loudspeakers . Top notch Jantzen Copper foil waxed paper inductors  Mundorf mid grade Evo aluminum foil oil for the Bass ,I  had them upgrade to clarity latest Purity caps  top mundorfwiringWBT connectors 

3 sets of WBT connectors on top they include several sets of mundorfsupreme resistors to adjust. The Mundorf AMT tweeter to your room , then 2 ndset for your main amp for speaker ,Or 3 rd set to run a separate amplifier dedicated for the woofers this is what I did , you can run a med power tube amp on top and a moderate SS amp for the woofers . The only headache is now running in the Loudspeaker drivers and thesemuch bigger capacitors , ijust let it play for a  week

capacitors to an very much Taylor the sound. Ifi am not totally satisfied I will put in maybe Mundorf supreme silver oil , but pricy about $1400 for just 3 capacitors per speaker x2. Danny Ritchie knows what he is doing  but uses not too much  better then average parts vs what I use IMO Go to  Humble homemade hifi capacitor test 

and ratings rom 7-15  for capacitors , many companies use cheap brass with thin gold plating . Copper is a 3x better conductor then brass which is too on the brighter side ,seen often in electronics everything in my system is gold overCopper 

do it right 1x and be done with it .

Type Qualio Ultra  Loudspeakers under $13k   And unique ,open baffle on top

and dedicated rear ported ,nice exotic Indian 🍎 Apple veneer with excellent low bass !!

Running one of the last pairs of Northcreek crossovers for B&W Matrix 801 S2 that George Short ever built.  Had him build the very important woofer Zobel circuit for each speaker too.  Huge improvement over factory.  Consider myself very lucky and actually a little smart :)