All,
For those that might not have ever read this full detailed restoration website article from 2010.
Particularly, those who like "subwoofers" in their games.
http://www.rjbaudio.com/BlackKnight/bkextrememain.html
A seriously unique full restoration for audiophiles using a Sony 500W receiver, Behringer UB1622FX-Pro Mixer not to mention a new lower range and the additional mid range speakers.
The playfields and plastics were replaced as well.
It makes for some interesting reading with a cup of coffee.
BK and BK:LE does not have any real "soundtrack" (which you can turn off anyway) so it was more a focus on other game sounds.
I am not sure what kind of "depth overkill" the speakers and amplifier put out with this modification (I hope the cabinet is in good shape, because it was clear additional plywood strength was added to due to age and moisture damage), but still pretty creative and kudos to the owner.
The voice sampling has to be haunting...
xTheBlackKnightx
LITTLE KNOWN FACT: There are significant differences in the CPR reproduction PF inserts from the factory PFs. The original BK and BK:LE PF inserts were fancy "jewels" not "starred" liked modern inserts, but have been unavailable in large quantities for quite a few years. Hence the changes. Most BK PF inserts have sunken significantly in games, but have been successfully "harvested" in some donor machines to make others look brand new!