massive audio has the nano amp. 4ch 2ch mono up to 2krms. soundstream. ELF umm some others too but i forgot

ARC Mini.

or an ARC XXD 4080.

yes the XXD is a full range class D, but it has virtually NO detecatble noise, really doesn't need any breathing room for cooling. Only draw back is if you're an audiophile, it's imaging isn't that precise.

If you just like it loud and clean, it's a fantastic little amp