February 9, 201511 yr The 4070 would beg to differ. The older Koss ESPs have bass, too. Both have their own solutions to managing the backwave and tuning the enclosure.
February 9, 201511 yr I love the idea of 4070's. Heavy and lack of adjustability kept me from buying a pair that sold local recently. They were in stunning shape. HS
February 9, 201511 yr I have listened to a pair of 4070 before, and it sure has bass. I'm wondering how Stax does it. By the way, ChrisX, if you are able to design an open back cover (3d design), I can help you print them out with my 3d printer. Then you can change the cover to see if the sound is any better. Wachara C.
February 9, 201511 yr The 4070 is ported or rather slotted, so a bass reflex design. They diffuse the backwave and it will hit the ports or rather most of it. Pretty clever way of doing it...
February 9, 201511 yr if you are able to design an open back cover (3d design), I can help you print them out with my 3d printer. So the plan is to convert the 900s into DIY-950s. Probably the best use for them.
February 9, 201511 yr There was a dynamic version which used similar housing back in the day. Parts might be interchangeable... A250 or something like that.
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