Okay and now for the Tang Band W8-1808 driver.
The TB driver has a pretty aggressive rising response. This is one of those drivers that will sound pretty hot, and may reach fatigue levels pretty quickly. And it is compounded by the step loss below 500Hz.
This is a pretty large diameter driver so it looses off axis response pretty quickly. You'll need to be parked in front of these with them aimed right at you or you'll loose the top end quickly.
The spectral decay shows a little bit of stored energy across the board in all areas but no big issues anywhere. I had to raise it up 5db on the scale to get a good look at it down low, so the top end blew off the scale.
The impedance curve shows a resonance bump right at 900Hz. There is also a corresponding peak in the response right at that point. And there is a little stored energy in seen in the spectral decay in that area as well.
But check out the response with a correction filter. This is incredibly smooth. I left the top end up just a hair because these things drop off so sharply in the off axis. So the listen can play with towing them out a few degrees to get the top end response they want.
And the spectral decay with the filter. Nothing to get too excited about there, but not bad either.
Here's a before and after for comparison. This will be a lot easier to listen to.
The huge drop off in the off axis could be supplemented by a rear mounted or up firing tweeter to add back some of the lost spacial ques to the room response. That will improve the imaging and sound stage layering a bit.