FRFR Advice and choice of speaker size

Hi, I will goo FRFR soon for live gigs.

I'm playing on an 8 string that I will use also with bass profiles and synth sounds (mostly from my Boss-SY-300 and some from the kemper).

I know the Yamaha DXR 10 is very popular.

For my use I think I need an 12 speaker at least and possibly a 15.

What do you think about that ?

Here are what I'm looking right now (budget is also something to consider)

The Box Pro dsp 112

The Box Pro dsp 115

EV ZLX 12p

EV ZLX 15p

I also recently heard about Headrush from Ingolf and found it very interesting so :

Headrush frfr 112

and Alto's also, If it's the same it's cheaper and there is a 15 version

Alto ts 312

Alto ts 315

Nice rig !!!

With your experience, do you think a 12 speaker is enough for bass & synth playing with an 8 string guitar ? (bass playing is for the moment what I do less)

Quote from MuddySludge

Those damn drummers determine what's necessary. The 12's sound great but a loud drummer demands more power.

Well for this particular project I will bee on duet with no drummer (all from computer, mostly electronic sounds) so the amount of power is not what i need the most (need enough for little gigs) but I was asking that for a good bass sounds when i need to play through bass rig or synth with octaver etc, I feel 12 will be enough but not sure)

Thx that what I thought !! Now I need to decide which brand, I think I was more on to give a try to the T box pro cause for the moment I'm happy with Thomann's products (harley benton etc) and I can save few bucks but review are not great.

The EV ZLX 12p was the one I was looking years ago before buying a harley benton power amp to use my beloved vintage marshall cab.

And now the headrush looks very good to me, even more if I can go Alto cause it's cheaper (some people don't see any differences some do)