Measurements may give us an idea of tonal balance of a system, i.e. A loudspeaker system is meant to give us a satisfying idea of an acoustic event and for some people a pair of 5 USD ear-plugs are enough, others spend 200 kUSD on a truly full-range pair of speakers - and the latter may not be happier than the former.
The perception of sound is way too subjective to be reflected in any measurements we can perform. "A few comments on MEASUREMENTS before you start interpreting the readings below.įirst of all, if we think measurements will tell us how a speaker sounds, we're wrong. None of my 3 wobbly lines are sufficient to provide this information.įinally, I'm reminded of Troels Gravesen, and his comments about people looking at his wiggly lines: On-axis absolute average deviation relative to the mean sound level between 200 and 400 Hz, in 1/20-octave bands from 100 Hz to 16 kHz. On axis smoothness in amplitude response based on a linear regression line through 100 Hz to 16 kHz. In the Olive Experiments- for in 12 bookshelf sized speakers were studied what matters is:īass performance: (25%) (LFX: -6 dB down point relative to listening window (LW) sensitivity in the range 300 Hz to 10 kHz and LFQ: absolute average deviation (dB) in bass frequency response from LFX to 300 Hz. What constitutes USEFUL measurements for a bookshelf speaker, that may be correlated with listener preferences, would be something like the CTA-2034-A, or "Spinorama" Please do not interpret too much into my measurements
#Jeff bagby speaker designs driver
They do not take into the bass response a) the driver b) the passive radiator, c) the room, which generally affects everything below the Schroeder frequency of ~200Hz. There is 1/12 smoothing applied for visual clarity. It is on axis with the tweeter (eyeballing) and off axis, again is by eye balling. They were done in the far field, (x2 significant dimension of the cabinet) and are ungated, so accuracy is lost below 150Hz or so.
#Jeff bagby speaker designs windows 10
(Sonarworks XRef20 48V XLR microphone, Focusrite Scarlett 2i2 mk3 USB audio interface, Windows 10 laptop, REW Software, and VituixCAD's Measurements Preparation with REW help guide. They were done with what I would call "good-enough equipment" for a hobby grade DIY builder. I posted those 3 lines here, along with the cabinet photos as a proof of DIY Mission Possible in anticipation of the "if you didn't take a picture it didn't really happen" commentary. My measurements were taken to satisfy myself that For music, it's all there.īut why is the imaging is so spectacular? Late night intimate listening has never been so good.įirst off a few thing about my measurements: If that bothers you then build the one with the beryllium dome- it's a drop in replacement and doesn't have that failing/feature.īut the other thing that the visual measurements between 100Hz to 10Khz aren't telling me ~7ms gating, so it's good down to about 150Hz, but in- room there's bass to around 50Hz. When I look at the measurements, sure, the first thing that sticks out is the top octave (10-20Khz) on-axis. Like your own children, you don't have a best.īut you want something small, around the size of the LS3/5A or Jeff Bagby's own Continuum speaker, this is something special. My other speakers are Music and Design NaO II, and Jim Holtz Statement II, both over 100L. Always kind, generous, and shared his knowledge. I never met Jeff, but corresponded with him from the days of Madisound BBS forums over 15 years. I opted for the Soft Dome SB29SDAC variant, instead of the beryllium dome SB29SBAC, and the white MW13 for aesthetic reasons, and used blackheart sassafras, an evergreen tree native to south eastern Australia where I'm currently living. I’ve been in this game over 20 years, and it’s just phenomenal.Īll the kit components can be purchased in one convenient package, who ships to North America, Oceania and elsewhere: This does everything from acapella to classical to jazz to rock.
Here is my iteration of the late Jeff Bagby's amazing SB Acoustics Revolution Mini speaker.įor those uninitiated, the Revolution Mini was designed by Jeff Bagby in late 2018.
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