Subwoofers are a relatively new thing compared to the vintage design models that the Klipsch Heritage line offers. So not sure it makes much sense to have a Heritage powered subwoofer. Would a heritage subwoofer look different than any other with the proper desired finish? But hey, if there is a market for such a thing, why not.
I sought out and use this discontinued Klisch powered sub Klipsch SW-308 Ultra-compact powered subwoofer at Crutchfield. It’s a very compact big hitter down to below 30hz with its 3-way 8" active/passive driver design and is suitable for use with most any speakers to fill in the lower octaves in a smaller to modest size room.
It is relatively small and has a very clean design aesthetic that can easily fit in most anywhere. Highly recommended if you can find one or newer equivalent!