I owned an AER Amp One for a year or two, I asked the importer would it work into a 4 Ohm load. They do not reccomend connecting another 8Ohm cab as it would run too hot and the thermal cut out woul be working overtime, in short it could "fry". So what I did was to buy a Roland Sub (powered) to complete the ultimate miniscule powerhouse.
Sold the AER Lozbass on here and the Sub to his mate Bill, but, just bought the Sub back as I use 5ivers most of the time now.
Way to go is use the Sub out to a powered Sub or similar cab