If somebody is interested: I added a distortion measurement, which was taken after the calculated MSO tunings had been applied to both the subwoofers.
In terms of budget, you should still not completely discharge BK Electronics. For instance, you could get 12" driven/12" passive radiator sealed subwoofer(s), with an equivalent area to a 17" woofer - or double 10" driven sealed subwoofer(s), with an equivalent area to a 14" woofer. Cabinet vibrations should be lower as well, as the subwoofer(s) simply have more weight. It is a bit hard to find measurements of the new BK subwoofers; but you might want to send a request directly to the manufacturer. // BK subwoofers would probably give you (one of) the best cost/performance ratio(s)
in Europe; besides following a DIY approach.
I am not sure if the SB-1000 would allow for an "easy" integration with your M106, since it seems to roll-off quite early, prior to 80 Hz, on its base frequency response [called "Groundplane" on the following measurement,
upper graph; where the
blue curve shows the
minimum, and the
green curve the
maximum low pass filter settings]. Although, it seems you plan to use the IOTAVX AVX1 processor for subwoofer integration, one of the higher low pass filter settings on the SB-1000 might be more practical; instead of bypass via [
LFE]-position selection.
View attachment 65358
[
Source: SVS Germany ]
Furthermore, if we consider the
two green 90 dB curves on the
lower graph, we get a distortion of roughly
16% at ~27 Hz; by application of the formula to calculate THD in
%: THD = [10^(
-ΔdB/20)] x 100. Where in this specific case,
Δ would be roughly 89 dB [fundamental] - 73 dB [distortion] =
16 [dB].