How do you make a kemper sound like it’s in a real space?

I love the room emulation on the Strymon Iridium. Surely there's someone that sells a Kemper "room pack" that sounds decent?

In terms of reverb plugins:

• there are some good IRs of small rooms out there for IR reverbs.
• Phoenixverb is maybe my favorite "real world" sounding verb. There are some great small verbs in there.

That's close to what I do. Just above the mud, just below the fizz.

Tube plugins, close mic ir with a typical guitar amp mic like a shure, varimus, utility verb, and fake room mics.

Free Shattered Glass and Variety is Sound, Cheap Klanghelm and Fuse plugs, a ton of free irs, and many verbs can make it sit. Avoid plugins with minimum phase oversampling. This is even more important than heavy aliasing because you don’t want it to be totally out of phase with what you blend it in with even if you’re using rough rider or reaper plugs.

this can work:
1) Compress the amp sim with a varimu pre ir. Maybe post ir. Whatever. Just try to make it simulate a real driver thermally compressing
2) very slight utility verb blended in parallel after the ir. Use whatever you like that works with the room.
3) tube plugins. Go to town. Sdrr is cool. Shattered glass is cool. Fuse is cool. Black box is cool. Even the voxengo stuff can be good enough. Use a Varimu here maybe too. Works. Mjuc is great for this.
4) stick everything in the mix in a  room reverb compatible with the ir verb. This is your fake room mic. Maybe A fake room mic just one for guitars? Use a predelay. Appropriate wetness. This is a separate track of course.
5)Nuke fake room mic with phase linear compressor of choice. Transformer emulation is fine. You just need to avoid minimum phase oversampling. Sorry Presswerk and DDMF magic death eye. The air gives you away.
6) Blend it all in. Stick everything, including the non guitar tracks, in a room reverb. Blend that in.

Sometimes this works, sometimes it doesn’t. Sometimes only nice reverb works, sometimes you need something hazy Like Valhalla and sometimes you need a trash can. Whatever works works. It varies production by production and blending in the fake stuff with the actually recorded stuff.

Turn the internal reverb off and run it into a Bricasti.  Dial up Studio A. Mix to taste. Done.

I won’t be buying a bricasti, but I am contemplating demoing seventh heaven

I think the room verb sounds pretty damn good in the Axe FX III

That could do it.  I've heard good things....  Try the rooms, and salt to taste.  Studio A is like a miracle drug for me.  I'll put it over entire mixes during mastering sometimes.  Makes everything that goes thru it "come more alive".

Y’all know if you just pull the 6J7 grid cap on the CA-70 and make a grid cap to 1/4” adapter you have a tube DI right there already?

Maybe that’s inside and you can’t get to it.

I usually rely on IR reverbs for a roomy sound with a sim amp, something like Altiverb, Waves IR-1. But I also agree that the Exponential Audio ones work well too. Maybe some Eventide T Verb once in a while. You could use the same idea on a miked up real amp. I have not demo'd the UA Ocean Way or the IK Sunset Sound, but those also seem like things that could work.

It's a dragon that I chase sometimes, but there are other times when I want the most direct, annoying, in your grill kind of sound possible.

Guess I finally realized the value of room reverb sounds, to put it simply. I am listening to The Doors right now and there is a ton of verb on every instrument in the mix. The self titled album. It doesn't sound like microphones, it sounds added.

Also noticed that fuzz tone plus reverb is a big Jimmy Page sound.  I used to sort of forget the reverb and focus on the fuzz, but I'm catching it more now.

Have you tried "Space" under reverb in the Kemper? Designed to be reflections in a small neutral sounding room.

I have Nimbus already, but didn’t have much luck getting it to sound great as an insert on the kemper dry track.  Of course, I only spent 15min tweaking it