Any reason not to place stand mounted speakers upside down?

Hey wipsaw,

Some years ago, I purchased a pair of sight-unseen 24" Target stands for use with my Salk Veracity HT1s from an acquaintance who had them stored at his parent's house, instate.  They turned out to be 28" stands, so I faced the same dilemma.  Always helpful, Jim Salk saw no issues running them tweeter down and I was very pleased with the results.  Later, I've been able to right the system with a pair of Paradigm Ultracube 10v2 subwoofers beneath the Salks with IsoAcoustics ISA-L8R200 stands, carefully adjusting for height and tilt (arrival times.) 

The results in my little studio cube are quite spectacular...nearly 20 years of room tuning and sophisticated DSP...first, do no harm /// or, if minor harm be unavoidable, be certain that it is heavily outweighed by success.  The golden paradigm of "straight wire with gain" I've found to be a misnomer in the digital world.  After giving up a hard worked - full blown SOTA/Fidelity Research fx64/vacuum/electronic flywheel rig two decades ago, overall, this is decidedly better.  Good luck, wipsaw!  Happy tunes and More Peace.  Pinthrift     

Not sure what crossover order the Harbeths use but these two links give a visual on the different lobing patterns.  Merely for visual, no claim by me to the content accuracy. 

http://images.audiojudgement.com/2017/05/Speaker-lobing-2-way-3rd-order.jpg

http://images.audiojudgement.com/2017/05/Speaker-lobing-2-way-2rd-order.jpg

No its sounds like fun jump on it!!

Then wouldn’t it be in reverse polarity then? I guess you could stand on your head then it would be in correct polarity. 

There should be no problems with mounting a speaker upside down, unless the woofer magnet assembly is being supported by an internal brace that is relying on gravity.  That would be an unusal setup (most drivers are not supported internally.  Harbeths are not supported this way).  

You can certainly try inverting the speaker.  However, there might be some complications as far as the sound is concerned.  This might increase the problem with floor bounce cancellation of lower midrange frequencies.  The higher the woofer is off the floor, the greater the chance of floor bounce being an issue.  To some extent, designers try to account for floor bounce, but, they never account for someone inverting the speaker and increasing the height of the woofer.