(My apologies to zeiglj for this post - but it is a different forum!
)
For those of you who want a giant killer for not much with a simple DIY, you can vastly improve the bass on these things at high volumes by bracing the cabinets - and putting non-drying clay on the outside of the port in the interior and on the front baffle. I don't have the Ultras but it sounds like
the DCM's would equal (surpass?) them if you did so.
"Where the ultras really shine over the TPs is in mid and lower bass, especially at volume. That's not to say the TPs won't get plenty loud without breakup. They hold their own very admirably. The Ultras do it just a little better."
I wasn't overly impressed with these (outside of the outstanding bargain they are) compared to more expensive speakers until I did this.
Much tighter and lower bass coming out of these now.