Hello fella...

I'm Very Excited and can't wait for my new speakers to arrive. I purchase the M80Hp & 180 thanks to Debbie Swinton at Axiom for the awesome first time buying experience at Axiom.

I was hoping to get your opinion on the best crossover setup for my speaker with a sub. I'm running a 5.1 for now until I could get pair more SB for my setup. Any advice would grateful.

This is what Ill be using for my HT
Anthem MXR 510
Anthem MCA 50
M80
Vp180
Paradigm CI Home H65-A
SVS PB-2000
Oppo 103
Sony VPL-HW40ES

https://onedrive.live.com/redir?resid=5415E327D68846D9!1850&authkey=!ADuGZoBNcrDeN2M&v=3&ithint=photo%2cjpg

I would run ARC on the Anthem and see how that sounds as is and then adjust the crossovers from there as you see fit. I'll bet the sub and speakers will be set @ 40hz.

I have M80s and VP160 with SVS PB13 Ultra fed by my venerable Denon 3808. Audyssey set my crossovers at 40 across the board but I moved my crossovers up to 60 on all 3 across the front. I found dialogue cleaner/crisper with the slightly higher setting.

My favorite is no subs/no cross over.
I'm currently considering selling my subs.

Most of the recommendations say double the lowest frequency of your speakers with subs I.E. 35hz set to 60 40hz set to 80, though with the H.P. version you could probably just leave it at the 40 crossover or full range no problem.
I have reg. M80s that I run full range with the help of my power Amp. Your MCA50 should have enough muscle to carry the low frequency power demands of the H.P.

Though beware the power of the M80 needs a powerful sub.
I have a PB1000 that couldn't keep up with my M80s. almost the same notes or range. So I added a EP500 though I'm a bass head and wanted to have more the dinosaurs in Jurassic park in my living room for my kids.

Cheers

So you're running Full range on the fronts and adding a sub to get more extra bass? I think my svs Pb-2000 has some powerful bass sonic I could feel in my chest.

Yes, not really extra Bass but full bass as the Full or 40hz is about the same roll off. Your M80 H.P. can handle down to that frequency with ease, so in my case I found that a 10 inch PB1000 was almost covered by my M80s already. {unnoticeable}