Stacking

Right now, I have not run all HT wires under the floor, so my subs are stacked in the corner. It works, but it's not optimal. DSP helped, but they need to be moved. 

What did help was putting isolation pucks under both subs, decouple the subs from each other and the floor. 

Not wise. 

The subwoofer generates strong low-frequency energy and vibration, which can transfer to the speaker and create additional resonances that interact with the speaker’s own natural resonance. Additionally, the La Scala is 40 inches tall, with the horn located around 33–34 inches—right at typical ear level when seated. Placing it on top of a subwoofer would raise the tweeter and upper midrange horn above the ideal listening height, potentially affecting the speaker’s imaging and soundstage precision.

Over time, the continuous vibration can compromise the structural integrity of the speaker cabinet. By the time cracks appear—either internally or externally—it may already be too late to prevent damage.

Thank you for the reminder. This makes me realize that next time I’m considering a used pair of speakers, I should ask the seller whether they’ve been placed on top of a subwoofer for an extended period.

Lastly, the ideal placement for a subwoofer is not necessarily directly beneath or near the speakers. Experimenting with different positions is key to seamlessly integrating the sub into your system. Limited space should not be an excuse — it may even be possible to place the subwoofer along a side wall.

@lanx0003 good point!

I was thinking between the fireplace & the speaker, where the MK subs & my networks sit.

Yes there are plenty of things that isolate speakers and slow vibration transmission.svs has some reasonable feet put 8 on the bottom of each klipsch and see what happens.this experiment would cost you a few hundred dollars.you could always use these somewhere.enjoy the science.

@mark200mph Thanks. I have them under my MK-125 & I'm very happy w/them. I have these under the LaScalas, & helps with the uneven floors.