Has anyone who posted so far actually tried the djk mod? I have, and I recommend it wholeheartedly to anyone who has neither the space, finances, or desire to add a sub or subs. Personally, I would add multiple subs (horn or tapped horn) to domesticated La Scalas, which would make the mod unnecessary.
I performed the mod on the La Scalas I refurbished for the local high school band. That application was never going to add a sub, so any bass enhancement was a welcomed improvement.
The following are my thoughts and observations:
La Scalas, without the mod, are NOT horn-loaded below ~ 100Hz;
Without the mod, below ~ 100Hz, La Scalas are direct radiators;
With the mod, La Scalas are still horn-loaded above ~ 100Hz;
With the mod, La Scalas are bass reflex below ~ 100Hz;
The mod reduces the efficiency ever so slightly;
With the mod, a tiny chip amp can power the La Scalas to loud and clear levels so that Back In The USSR can be heard throughout the two-story school from the basement band room;
The mod is easily and completely reversible;
TTBOMK, no one who has done the mod, without sub(s), has reversed it;
djk, Dennis (RIP), the author of the mod, knew what he was doing;
Follow Dennis’s recipe, including crossover modifications, for best results;
The perceptible and useful bass extension provided by the mod in a residential environment is into the mid 30Hz range;
If you want useable bass below ~ 35Hz, sub(s) are required;
IMO, the “tight” low distortion dynamic bass that I love about La Scalas is not diminished a bit by the mod; and
The details of the mod are searchable. IMO, an unwillingness or inability to search old threads and posts to follow Dennis’s excellent modification exactly act as a filter. It’s a hobby. If you need, or prefer, to snap your fingers to get lower bass from La Scalas, add subs.