Looking for a speaker for my LM 845 Premium

AN may well be a good option...

But... you might also consider Proac, which mates well with LM amps.  

And... the Spatial Audio line are very efficient speakers... and would likely be a good match, maybe better than the Proac speakers.  Open baffle speakers are special, if they are efficient, which Spatial Audio's are.

I have a pair of AN J-Spe and they are great with my AN 8W per channel amp. Your room probably will allow the AN E-Spe. Sound is incredible....

The hardness brightness in your mid-range is probably coming from the speaker cables in the interconnects. Any of sea wire no matter what they do to it will cause those problems to happen. Try OCC single crystal wire, that has been proven to be the best wire for audio out there. Acoustic Zen has the best prices, everyone else is charging way too much. Call Robert at acoustic Zen the guy is a walking encyclopedia for sound.

If you want a very open neutral speaker try listening to the new monitor audio gold generation 5 or the Platinum generation 2. Those AMT tweeters are so sweet and the mid-range is very three-dimensional and open and the bass is tight fast and articulate.

@havocman

The hardness brightness in your mid-range is probably coming from the speaker cables in the interconnects.

Do you even know what he's using now?