Originally Posted by RickJames
Most of the big names follow the AES guidelines, they measure half-space anechoic. The only major exception is Klipsch, who might measure in room, but they really don't say. I don't blame them, every measurement I've seen done by accredited sources, like soundandvision, measures half space and their results are 4 to 6dB lower than what Klipsch claims.
His measurements were in room. I wouldn't call him an accredited source. He's an amateur who does reviews for stereo mojo. That's not stereophile, and he's no Kalman Rubinson. But at least he says up front that he measured in room.
I'm up on all of this... 6 years of my career was spent with my desk two inches from the door of an anechoic chamber. I've designed well over 50 commercially available loudspeakers to date. I've long lost track of the competitors models I've evaluated through electro-acoustical data collection. I regularly spent my work day capturing microphone measurements with EASE - Enhanced Acoustic Simulator for Engineers. The data I collected had to be spot-on perfect so acousticians could accurately design public venues (airports, theaters, concert halls, etc...). I'm also confident "AES" is up to date on EASE. In my opinion, EASE makes the hi-fi type measurements music lovers rely on look like child's play. I feel somewhat confident in saying I've measured and collected more data on loudspeakers than the average reviewer will capture over an entire lifetime.
BINGO on the famous American brand you've called out!
Thanks for touching on "half-space anechoic" too. Over my career I've used "half-space" baffles extensively. I've found them to be near useless in designing hi-fi and/or home theater loudspeakers. I did find them very handy while designing in-wall, in-ceiling, and outdoor ground level loudspeakers (the ones that look like fake rocks). Transducer engineers are the individuals that require living in a "half-space" world. I couldn't design a woofer, tweeter, or midrange without a "half-space" chamber.
So, due to "AES" guidelines are you telling me some people prefer loudspeakers to be baffle flush mounted into their walls in a "half-space" format for that extra bottom end SLP 'kick' and the shallow depthless imaging caused by the immediate boundary? I'm asking myself what "half-space" has to do with real world music... both live and recorded source?! Dr. Bose became a billionaire through "direct and reflected" sound not boundary sound. For myself, I've always found the imaging to be somewhat compromised when enjoying 2pi-fi! Now, please remind me again... 2pi provides emphasis to low frequencies directly on-axis by how much...? Now you've really got me thinking.... I wonder if shooting a loudspeaker intended for an open room and placed in "half-space" was dreamt up (long before I was born) as a simple and elegant way of padding specs to get the advantage over a competitor...