2 -> 4 ch processor (like Fosgate)?

A friend who once owned a Fosgate processor hopes to find a similar audio-only processor. He desired setup would be two channels in, four out. The budget is under $1000.

He thought about buying an old Fosgate on eBay, but the word is, their build quality was poor and problems are likely.

Are there any recommendable current products like this? Or is it a category whose time has passed?

If the latter, do you know of specialists in repairing old Fosgate units?

THANKS!