Hi Dennis,
The 105.4 is a great speaker. I'm sorry I don't have an answer for you, but you might find what you're looking for in this lengthy thread, where the owner completely rebuilt a set of 105.4s including his own bass cabinet design:
http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=1585&postdays=0&postorder=asc&a...
The 105.4 is a great speaker. I'm sorry I don't have an answer for you, but you might find what you're looking for in this lengthy thread, where the owner completely rebuilt a set of 105.4s including his own bass cabinet design:
http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=1585&postdays=0&postorder=asc&a...