The Delta 15 used in Theater Series four π Speakers really needs a large box, and even with that, they tend to have rising response into the midrange. The bass is clean and full, but many people still like to augment them with a sub.I think George built his exactly as the plans indicate, and if not then perhaps he'll correct me. But the plans for Theater Series four π Speakers show a 4" diameter port that's 3.5" long. The intended port material has 0.080" wall thickness, and that's what is included with the kits. This makes the actual port diameter be 3.84", and system tuning is therefore 23Hz. Response is shown below:
Response of Theater Series four π Speaker
The Stage and Premium Stage Series speakers share the same cabinets with their Professonal Series counterparts. Here are the response curves for the Stage and Premium Stage speakers:
Response of Stage Series four π Speaker
Response of Premium Stage Series four π Speaker
Just for those that are unfamiliar, π Theater Series use Eminence Delta parts, Stage Series use Omega's and Premium Stage Series use Kilomax components.
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