Comparing
18's:
The McCauley 6174 (800 watt 4ohm), Beyma 18G50 800
watt 8ohm, and Eminence Kilomax 18
1000 watt 8ohm
Cabs optimized for low extension and power handling:
Violet trace is an 800 watt 18" McCauley 6174
4ohm driver in a 10 cube box tuned to 23hz. Red trace shows an
Eminence KiloMax18 1000watt 8ohm driver in a 7 cube box tuned
to 37hz. Blue trace shows a Beyma 18G50 800 watt 18" driver
in a 5 cube box tuned to 40hz. At 40hz all three appear equally
loud. The Kilomax registers +3dB @50-60hz over the other two,
but 6174 has the lowest extension with the best power handling
in the 20-40hz region.
At 40hz the McCauley becomes a 500 watt driver;
@ 55hz the Beyma a 600 watt driver; @50hz the Kilomax a 900 watt
driver. Putting the 6174 in a smaller cab with higher box tuning
would increase power handling.
Note: the top of the graph is the 1000 watt line.
All drivers shown excurse within their cone displacements
in these configurations. The 6174 has 15mm of xmax; the
Kilomax has 10mm, and the 18G50 has 9mm. Increasing box size and
lowering the vent tuning will enable the woofer to play lower
frequencies but will result in cone excursion beyond controlable,
safer limits.
Note: the dip in cone excursion corresponds to the
box tuning.
Telephone 410-254-9080
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