Originally Posted by
Horn Fanatic
Okay. If you chose to proceed I recommend designing a horn loaded vent would be in order. The calculations for that method are considerably more simple.
The chamber volume required for a 2220 / 130A is approximately 2.2 cubic feet. The E130 is a good candidate, if you can find a pair that hasn't been beat to death. The D/K/E 140 is a no go, along with the 2226. The 2227 looks like a promising candidate, but finding even one on Ebay would be a miracle. Loading a horn such as the Paragon with an LE 15 has to be JBL's mother of bonehead moves.
The throat area and chamber volume are inter-related, as the combination of the two serve as an acoustical low-pass filter. The length of the horn is determined by the throat / chamber parameter combination that determines the filter frequency. The EBP for the E145 is 134.6. The EBP for the 2220, depending on the suffix model is approximately 200.
H.F.