These may not meet your bass requirements, but they sound worth investigating. I have not heard them myself, but they seem worth checking out, plus they come with a 30 day money back guarantee.
Here is a thread with a link. I am not affiliated, just an interested reader.
http://www.audioasylum.com/forums/hug/messages/120970.html
Here is a thread with a link. I am not affiliated, just an interested reader.
http://www.audioasylum.com/forums/hug/messages/120970.html