so im thinking about replacing the 15 inch speaker in my old polytone amp and i was wondering what people would recommend putting in there. just some background on what it would be used for: mostly lower volume acoustic gigs. i dont need a ton of low end extension, as a matter of fact, when i use my thunderchild 112AF i plug both ports and usually use a high pass filter as well (i play upright bass). so basically, something with a more or less flat response, but a ton of volume and crazy low end are not necessary. i usually roll of the highs also, and just find my mid frequency for the room that will help cut and punch, slight boost, and im done. the amp is a combo with a sealed back. around 100-150 watts. im having the transformers replaced too, so im not sure if there will be a power increase, but probably not.