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In Reply to: RE: Sixth order Butterworth filter? posted by airtime on May 12, 2017 at 10:03:32
* sign on the specs where it stated that the speakers can only achieve this frequency response if you buy the optional external filter. This external filter gives the possibility of extending the response down to 25Hz(-3dB point) using the 6th order Butterworth alignment. This will also filter out the unwanted subsonic frequencies, which may introduce the intermodulation distortion (according to the manual).
If you look at the spec again and read it you'd notice that the speaker main crossover network that is being used is the 4th order Butterworth network.
If a thing's worth doing, it's worth doing well
(Proverb)
Follow Ups:
802 S3 specs found in the manual. It is 4th order Butterworth crossover network.
If a thing's worth doing, it's worth doing well
(Proverb)
...the 801M Series II spec states exactly as what you posted regarding crossover alignments. However...........in the discussion section of the 801 users manual preceding spec tabulation: "It should be noted that the loudspeaker may be used perfectly satisfactory without this additional [BAF] filter giving the system a fourth order Bessel alignment." In the case of the 801, the BAF is actually a S&K 2nd order HP filter with fc~20Hz and Q=2. All this is consistent with 4th order Bessel w/o BAF and 6th order Butterworth w/BAF. I assume, maybe incorrectly, that the 802 is same basic design w/diff fc.
Without the add on BAF, it is a 4th order Bessel.
My reason for posting was the glaring inconsistencies between Users Manuals, Spec Sheets, back of speaker markings, and everything else.
The B&W 801 & 802 Matrix (of various iterations) are/were some of the most widespread loudspeakers on the planet in recording studios & other technical environments. You would ALMOST think that solid data & measurements for every possible configuration would be reliably available on the internet.
...OTOH, the Internet is much overrated.
Edits: 05/12/17
Yes, they are reasonably accurate, but using a CD of various test tones & sweeps, and a crapload of alligator clips, and resistors that haven't been officially "calibrated," and mediocre multimeters, and...
Yeah - simple measurements & actual hookups/cable swapping confirm that in my particular setup, using the A&B front speaker connections to bi-amp the B&W 802 Matrix S3 (with the "A" outputs driving the mid/tweeter terminals, and the "B" outputs driving the bass terminals) not only sounds better, but is also the most stable connection (as also verified by the manufacturer of the POS (well, not THAT bad) receiver that I am driving them with.
Hey, speakers are like sausage making. If it sounds good don't ask how it's made. Just enjoy them.
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