Had a Lambda Electronics 10" sub being pushed by my PG XS6600 amp at 300W RMS in a 1.0 cu ft enclosure... not working now for some reason, so looking to replace.
if you want to use the same box an IDQ would work in a smaller enclosure you could just add some 2x4s in it to fill in the extra air space. or if you could modify it and have the room for it 1 cube is perfect for an IDQ12.