Re: Can anyone here recommend a good affordable isolation cab?
I use the Randall ISO cab and am actually going to pick up a second one for blending. Most iso cabs only attenuate 29-30 dB, so you will need to reinforce it quite a bit if you want to get sane levels out of a cranked valve amp regardless of wattage.
I put mine on an Auralex Gramma, added Auralex Studio Foam to the inside, and wrap a few duvets around the outside when recording with it. When placed in an adjacent room or closet, you can barely hear it and it does not disturb anyone. My kids are able to watch TV or do homework whilst I record, no problem. But that requires much more attenuation than 29dB if you are winding your amps up.
Friend of mine has the Jet City. It's similar to the Randall. Also discontinued now.
There are a couple of other iso cabs like the Rivera that allow multi mic'ing, which is nice, but the Rivera is overpriced in my opinion for only 29dB of attenuation. I can get two Randalls and still save money over the Rivera...
The cabinet may be an issue, especially without treatment inside, if you are playing downtuned since it ports into the upper chamber with the microphone and give you a boxy sound if you are not careful. Careful mic, speaker selection and mic placement is essential.