Normal
Peter's design uses the 12" in their piston range, crossing over at 630 Hz. That low of a crossover requires a co-ax mid/hi driver to "keep up" with the output the dual 12" are capable of.Eminence does not make a co-ax mid/hi driver. Using their 1.4" 3" diaphragm HF drivers would work in the design, but would run into excursion limits (diaphragm hammering the phase plug) at a SPL well below the output capability of the 12" drivers.If the crossover frequency were raised to around 1200 Hz, a standard 3" diaphragm HF driver's output could potentially "keep up" to the 12", but the 12" would be required to operate almost an octave above where they sound the best.Bottom line- reduced SPL, or reduced sound quality.Art
Peter's design uses the 12" in their piston range, crossing over at 630 Hz. That low of a crossover requires a co-ax mid/hi driver to "keep up" with the output the dual 12" are capable of.
Eminence does not make a co-ax mid/hi driver. Using their 1.4" 3" diaphragm HF drivers would work in the design, but would run into excursion limits (diaphragm hammering the phase plug) at a SPL well below the output capability of the 12" drivers.
If the crossover frequency were raised to around 1200 Hz, a standard 3" diaphragm HF driver's output could potentially "keep up" to the 12", but the 12" would be required to operate almost an octave above where they sound the best.
Bottom line- reduced SPL, or reduced sound quality.
Art
