ATC 11 Upgrade
The price of Sonicaps have just gone up and it caused a slight increase in the cost of this upgrade.
This upgrade doesn't change the factory crossover design other then lifting the tweeter level up just a little bit to bring it up to the woofer level.
The resistors and capacitors are upgraded as well as the wiring. The binding post are upgraded to tube connectors.
Check the video for more details.