Have you tried from amplifier directly to the woofer bypassing the crossover?

I have my Khorns in the corners with LF treatment above them in the corner with a triangular shape works great, no issues just clean as could be...

Thank you! I’ve tried running a speaker cable from the crossover directly to the woofer with the same result. Resistance reads 4 ohms both at the woofer and the binding posts that receive the input from the crossover. Does this rule out connections or cables?

Put the suspect woofer in the working cabinet. If it works, there's a fault in the crossover.   You could also try putting a voltmeter across the woofer terminals and setting the meter to AC volts. You could just connect to the woofer outputs on the crossover which is easier to access, but that won't tell you whether the signal is reaching the woofer's terminals.   Play some music and as you turn up the volume, the number should go higher. Of course, the number will bounce around with the music; bonus if your voltmeter has a "Max Hold" feature. You can then compare with the working speaker.  

You could run them with a million watt amplifier- actual power delivered to the speakers is based on the volume knob so unless you crank it up the speakers will only ever see a fraction of the rated power of any amplifier. Truth is a lot of times people "blow" their speakers from under powered amplifiers trying to push them beyond their limits  

I had reservations about putting up a Khorn for over 30 years. I thought there was only one correct positioning in the corners. And if it booms or resonates badly in this way, I have no alternative for positioning it in the room. This spring I took the plunge for the first time because I thought now or never. I have to say that, at least in my room, the Khorn makes the least drone of all the speakers I've had so far, almost no drone like my little BBC speakers can do as well. Everything sounds clear and differentiated, right down to the bass. Maybe I was just lucky. At least it seems that the Khorn “uses” the corners in a completely different way than when the corners are empty and then perhaps cause a boom when using conventional speaker setups. Maybe, and this is my amateur hypothesis, the cabinet of the Khorn itself prevents the boom because it fills the corners. In any case, everything is very positive.

My LSI both had loose connections at crossover. I’d start there. 

Have you tried if the connections and cables to the woofer are working as they should?

Here's a PDF that I believe I somehow got from Klipsch.  It's different than what has been posted so far. Maybe you will find it interesting and helpful.     Heresy Floorstanding Speaker.pdf

Leaf duty around here in Sherwood Forest, Dr appts workin their magic and just finished up the last of my dental work today.    An old local (now dead) dentist who was also an OSU grad told me 40 years ago to drive down to Columbus and hit the OSU dental school.  Blah, no kids werkin on my teeth I said.  Ya know what?  I'm sick of the wallet rape.    My local dentist passed a few years ago and I was looking.  Youngins setting up shop a couple days a week in about 3 towns is what Duckburg has been reduced to over the years.  Yup, they buy an old house and turn it into an office downstairs then rent the upstairs out to the hygenists cashin in all the way around.  So you pay up to pay for the new equipment and the house payments?     Tried a new guy people said was good.  Yup, his wife was a dentist too.  Even better right?  He did the drillin and she had about 4 hygenists she honchoed.  All playing beat the clock?  Seriously?  I had a wisdom tooth that had to  come out so the dude numbs me up then walks in w/a 10' long pair of Channel Locks and jerked both his an my brains out to no avail.  Ok, I'm done.     Next man up right?  400$ panoramic x-ray, cleaning 250 then he filled ONE tooth for 350?  Done!    Oh yea, that tooth?  A good ole boy from West Va married a friend a few years ago.  Older and they lived up on Lake Erie.  He had a side gig goin w/Aspen Dental makin some pocket cash.  They bought a 3M house that's beautiful right on the lake.  He cashed in.   Popped that tooth out and I didn't even know it.  Said he used weights.  Right.  I got a visual of a 16# bowling ball hangin on that tooth.  Don't ask me.  He said I'll be right back and 10 minutes later he walked in and used his fingers to just pull it out.  That was an hour north each way every time.   So I thought about OSU and what old Doc told me.  Called, made an appt, got hooked up w/a Jr Dentist who's done this spring and ready for his state boards.   What the heck.  An hour drive south?  May as well.   First time in he nosed and got the game plan.  55$.  X-rays of each individual tooth so he could see every angle of each tooth the next time.  104$  Cleaning 85$  Filled a tooth 110$.  Last day today, he knocked an old loose filling out and refilled it, then fixed up 4 other ones w/some minor work.   205$   Factor in 10 or 15 in parking?  Seriously?  The real down side is you'll spend an afternoon in the chair.  Why?   The faculty oversee'EVERY move.  Before and after.  The kids have to totally diagnose EVERYthing then they either get told how the prof would do it or given the green light..   Then they check 'em out when their done.  He did every bit of the work himself.  He had a younger Jr Dentist assist w/runin the shop vac for the fillings.  Crazy?  Yea, really was and I saved tons of cash.     Might wanna check it out.  Tech schools for the hygenists and colleges w/dental programs.  Get the f outta the box!  The money you save over the years will pay for those K-horns ya dream of!  I'm sold!