Bozak is
infinite baffle, which requires a
sealed cabinet which is
lined with cotton batting and has a
hanging curtain made from cotton batting. It isn't just a matter of dropping woofers into a box.
Some calculations and analysis I previously posted about the relative (more or less) volumes of the Bozak cabinets for three-way speakers, slightly revised for clarity. I omitted the tiny bookshelf units as those are slightly smaller than the B-313.
Cabinet Volume Comparison and Analysis for Bozak Line
Consider the dimensions (yes, I laboriously keypunched these and did the calculations, so errors may exist):
B-313 (Concerto 3)
Claimed Response: 40 Hz to 20,000 Hz
Dimensions ≈ 24 in W × 12 in D × 17 in H
Cabinet Volume ≈ 2.8 cu ft
Woofer Volume ≈ 2.8 cu ft per woofer
B-402 (Rhapsody)
Claimed Response: 40 Hz to 20,000 Hz
Dimensions ≈ 18 in W × 13 in D × 25 in H
Cabinet Volume ≈ 3.4 cu ft
Woofer Volume ≈ 3.4 cu ft per woofer
B-302 (Concerto V, Urban Cabinet)
Claimed Response: 40 Hz to 20,000 Hz
Dimensions ≈ 24 in W × 20 in D × 28 in H
Cabinet Volume ≈ 7.8 cu ft
Woofer Volume ≈ 7.8 cu ft per woofer
B-305 (Concerto Grosso, Century Cabinet, Dual Woofer)
Claimed Response: 35 Hz to 20,000 Hz
Dimensions ≈ 36 in W × 20 in D × 28 in H
Cabinet Volume ≈ 11.7 cu ft
Woofer Volume ≈ 5.9 cu ft per woofer
NB: Essentially a horizontal pair of B-302 (dual B-199, four B-200 tweeters) in a shared cabinet with a single B-209 midrange
B-4000A (Symphony, Modern Cabinet, Dual Woofer)
Claimed Response: 35 Hz to 20,000 Hz
Dimensions ≈ 27 in W × 16 in D × 45 in H
Cabinet Volume ≈ 11.25 cu ft
Woofer Volume ≈ 5.6 cu ft per woofer
NB: Essentially a vertical pair of B-302 in a shared cabinet with a single midrange, or a vertical B-305
B-310B (Concert Grand, Contemporary Cabinet, Quad Woofer)
Claimed Response: 28 Hz to 20,000 Hz
Dimensions ≈ 36 in W × 19 in D × 52 in H
Cabinet Volume ≈ 20.6 cu ft
Woofer Volume ≈ 5.1 cu ft per woofer
NB: Essentially a quad pair of B-302, or a double-pair of vertical B-305 with a dual midrange
NB:
(1) All systems are three-ways unless otherwise noted.
(2) The cabinets slightly vary with style, an inch here or there, so anything after the decimal point is not significant.
(3) Volume calculations use Bozak's published exterior dimensions, rounded down to somewhat account for cabinet thickness. Loss of interior volume to bracing, curtain, crossover, or actual drivers was not considered. (Left as an exercise for the reader)
Conclusion
Given Bozak's claims about the high-end performance of the B-200Y running to infinity and beyond, I suggest disbelieving the low-end performance claims without qualification for dB output at that frequency, but the relative changes may be indicative of inter-model performance.
Yet we may, nonetheless, observe that the better rated systems B-302 Concerto V and B-301B Concert Grand have larger volumes, respectively 7.8 cu ft and 5.1 cu ft.
The claim is made that the multi-woofer systems synergistically work so the increment space per woofer need not increase, but this is conjecture. What I can say is that if the Concert Grand followed the same rule of 7.8 cu ft per woofer, and the height and depth remained constant, it would be 55 inches wide, an increase of 1.5 times the original.
