HDS Tweeter - Lowest possible crossover point?

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Hi,
I'm running the HDS Tweeter in my speakers and I'm running into some lobing/integration problems from the MTM woofers being spaced fairly far apart. I built the Elsinores, but I'm running into problems because I listen fairly near-field, and the speakers sound better the lower I drop the crossover point.

I'm set the crossover point at 1.5khz currently, with an active crossover slope of Linkwitz-Riley 24db/octave. Is this as low as I can go, or can I go lower? I'm mainly worried about keeping the tweeter safe and not damaging it.
 
Linkwitz vs Butterworth

I'm set the crossover point at 1.5khz currently, with an active crossover slope of Linkwitz-Riley 24db/octave.

Check also a Butterworth instead of the Linkwitz on the side of the tweeter (only), ((2)or give a higher xover region for the mid-woofer, (3)or maintain LR on tweeter and lower crossover point from 1K5). That must work. Report results.

http://en.wikipedia.org/wiki/File:Linkwitz_vs_Butterworth.png
http://www.integracoustics.com/MUG/MUG/articles/circuits/
 
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