Optional Modifications/Tweaks

Flared port;
Hi-end internal cabling like Nordost Blue Heaven, Audioquest etc;
Driver gaskets, (added routing depth required)
Air-core inductors of 12-13 gauge copper
Audiophile capacitors like Crescendo, Aeon, Solen etc. To save the cost of using full uf value higher quality metal film capacitors you can simply connect a low value 0.1uf capacity in parallel with a lower quality capacitor to improve sound quality. This is highly recommended in the tweeter crossover section.