Just wanted to drop in and ask if you've made any progress on your speaker journey, and also say thank you very much for this thread!
I've had my unpowered rack unit since 2019 and have only used it live a handful of times. My son has had the Kemper in his room for the past year or so going down the Van Halen rabbit hole and is getting great results using a QSC K10. This has gotten my interest in the unit going again and I'm currently on the hunt for what speaker solution would work best for me in a live environment. Have two separate ideas for this, 1 - use Powerstage 700 in the rack and a 2x12 guitar cab, or 2 - acquiring one(or possibly two) QSCk10.2 or DXR10 and trying this route again. The QSC my son is currently using is on loan as the band uses it for a vocal monitor.
In the past I've used the Kemper rack with the QSC and have also run it thru a Peavey XXX head with a 2x12 cab, both solutions sound pretty good. The Peavey setup is just to heavy to haul around these days and complete overkill volume wise. The QSC sounds great, but when used on outdoor small gigs sometimes it just isn't enough volume for me, crazy I know as its 1100w. When I've used the QSC its on the ground behind me pointed at my head. Maybe it just needs do be further back from me, maybe I need 2, who knows. It is about 11 years old and maybe its just not working at 100%.
I should also mention that at the moment I'm not playing any large outdoor festivals with the luxury of sound techs. Mostly playing small private gigs/partys and we are running our own sound from the stage. The few times I've used the Kemper in this situation I know it sounds good because I'm getting tons of compliments and people asking about my setup. Mainly getting a comfortable stage volume is my issue.
Anyway, sitting here today I'm really not sure which route to go, but seriously leaning towards a powered FRFR solution(QSC, Yamaha, etc.), possibly a pair of them.
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I kept the Yamaha CBR10 passive speakers for a week and returned them, I would use them with a pa system in a heartbeat (mains or monitor) but didn't like them with the Kemper and SD Powerstage 700 at all. But reading through my posts it obvious this has been a struggle for me, I've only used one pa speaker that I liked but it is no longer available. If the QSC K series works well for you then I would suggest you stick with what you know, exploration doesn't always yield better results and it can be very time consuming as well as a definite loss of funds.
From the standpoint of a FOH engineer I can tell you this much, though all can be used with great results, the Yamaha CBR10 speakers are not the same as the DXR series, and the QSC CP8 does not perform like the QSC K8 and I assume the results would be the same throughout the CP series compared to the K series . I've used K8, K10 and K12 in different venues and found that paired with a sub they are very similar, the only time I've seen an advantage of one over the other has been when used outdoors the K12 projects better at distance, and in small to medium venues I do prefer the K8 or K10 for their wider dispersion of the high frequency driver for better coverage. The QSC KW series is a different beast altogether, I used them in an installation project in 2014 and they out perform the K series, I would hate to lug them around though as they weigh a ton.
Others here can give much better advice than I can when it comes to pa speakers as a monitoring option but if you like the QSC K series I think the K8 would be worth looking into if you could audition them at a local store. They are less money, lighter in weight by 5lbs and a smaller footprint if you are playing in tighter quarters but have the widest dispersion pattern of the k series. I have a friend who's band no longer use a back line and have went direct with their bass and guitar, they and are running their signals through stage monitors with good results. Again, others who use stage monitors can give better advice than me, but I would think it advantageous to place the monitor in front of you.
As for me, the Eminence EM12 is working out very well since I found a different approach in how I set the monitor out eq. I haven't had the opportunity to play my guitar for over three weeks, so before I replied to your post I sat down and played for about fifteen minutes. Having been away from the Kemper for a while my initial reaction this morning was this, my rig sounds great! But not my playing
!!