Most certainly a store brand, but that does not mean that they sound bad. You will just have to listen to them once the woofs are reconed. They might make a good pair for the garage, but you can be assured that they won't be up to the quality required for your main speakers. I wouldn't give over $5 for the pair.
I do like their thinking in providing only a midrange control, though. If the designers get a woofer/tweeter pairing that works well together, a single midrange control is all that's needed to offer dramatic changes in the system's overall tone.
GeeDeeEmm