I would then be tempted to suggest you follow the way E-V does it since its a known recipe. To my knowledge, no other major Manufacturer has used these as extensively as E-V. B6 alignments are attributed to Thiele by both E-V and Keele, however refined by Keele while he worked at Electro-Voice.Į-V's "step-down mode" is an approximate B6 alignment, but a tried and proven concept. The above mention about high-pass filter and tuning half octave below are in fact correct. I've pulled-out my tech stuff on E-V's Step-down mode EQ. with a proposed tuning at 40 hz would lead to a 30 hz tuning if designed for "Step-Down Operation". You should read more on this issue." My point here was that you don't pick an Fb at 30 hz because Rob did so. I mentioned in post # 20 "A steep high-pass filter is usually required as E-V doest it with their "step-down mode EQ" and there are other conditions like, if my memory is correct, tuning half an octave below "normal", not just any frequency below. equalization) because it requires more power which leads to more distortion caused by increased cone travel." In a home hi-fi setup, as Rob mentions, where one doesn't usually try to rattle the planet, if you have sufficient power available to provide + 6 db LF boost (= 4 times the power) and the driver is capable of reasonably high excursion (1400 ND: Xmax 7.62 mm, good) then why not go for it ? I would, with or without EQ. isn't a good idea in my view even if you compensate with DSP (i.e. Rob has added the suggestion of low frequency DSP to increase the bass. ft.), tuned at 40 hz, also pretty flat response except for a small. box so that you don't regret later, whereas I've given you in post # 12 a few smaller box options that would be better for your living room space as you say (e.g. I'm somewhat surprised that you seem to feel obliged to use a 120 L.
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