Almighty Subwoofers
By Stig Erik Tangen
01 Jan 1997
Postludium
The following is intended as a follow-up on the "REAL Subwoofers". I suggest you read that article first.
The "REAL Subwoofers" had been a very successful project, but several facts made me realize that far better performance was possible. I set the following goals for the new system design:
Heavier and more resonance-free enclosures
Move the lower cut-off from 16 Hz to 20 Hz to be able to use a smaller box volume and increase sensitivity and SPL capacity
Cross over at a higher frequency than with the current system (100 Hz instead of 32 Hz)
Driver(s) with less low-frequency distortion (better magnet/coil design)
Larger total driver cone area to improve linear SPL capacity and consequently reduce distortion and compression
Driver(s) with Thiele/Small parameters better suited for vented box (medium Fs, low Vas, Qts around 0,30)
Higher overall voltage sensitivity, especially in the 40-100 Hz region
The driver excursion shall not exeed 1/2 of Xmax at any frequency at 110 dB SPL, to insure low distortion at any listening level!
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