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Hi Mark,I modelled your box as a reflex enclosure with a very short horn (3") ... The PM90/60 is horn loaded above about 150Hz and more or less a reflex loaded below that so that it had useful response to 100Hz.If your box is a transmission line with a short horn in front you indeed may get some more efficiency. My best attempt to model this seem to indicate an efficiency just below the PM 90/60.Its been a long since I have heard a TL speaker but I can remember just loving the way they sounded.This video may be of interest [MEDIA=youtube]pPFpSPjTu2k[/MEDIA]
Hi Mark,
I modelled your box as a reflex enclosure with a very short horn (3") ... The PM90/60 is horn loaded above about 150Hz and more or less a reflex loaded below that so that it had useful response to 100Hz.
If your box is a transmission line with a short horn in front you indeed may get some more efficiency. My best attempt to model this seem to indicate an efficiency just below the PM 90/60.
Its been a long since I have heard a TL speaker but I can remember just loving the way they sounded.
This video may be of interest [MEDIA=youtube]pPFpSPjTu2k[/MEDIA]
