I am not surprised by the results. If anything, I was expecting worse.
I own the B&W M1s as part of a 5.1 home theater system, which sold quite well. They are definitely treble-heavy.
Like this:
Red line = on axis response
Brown line = 15o off axis horizontally
Yellow line = 30o off axis horizontally
Green line: -7o vertically
Blue line: + 7o vertically
Looking at the main axis (red), the response is not too bad until about 3kHz, then it drops by 6-7dB at 4-6 kHz, and it climbs about 10dB (!) at 6-10kHz. Clearly the tweeter is a mess.
If you sit lower than tweeter axis (green line) response drops by almost 15dB in the 4-6 kHz region. Ouch!
If you sit higher than tweeter axis (blue line) it gives you the best response but you cannot avoid the increase in the 6-10kHz region.
Long story short, no matter how much you fiddle with placement it is impossible to get close to a flat response.
It seems B&W have decent woofers, but can't get their tweeters or crossover right. Only their top Diamond range is decent.
Unfortunately, they are no longer the company they once were. In 2020 they were bought out by US fund Sound United LLC (parent company to Denon, Polk Audio, Marantz, Definitive Technology, Classe, and Boston Acoustics), who have turned B&W away from traditional hi-fi and more into designer of luxury lifestyle products, headphones, custom installation products, wireless speakers, and audio systems for the television market (like the Panorama soundbar).
The times they are a-changing.
gsp
I own the B&W M1s as part of a 5.1 home theater system, which sold quite well. They are definitely treble-heavy.
Like this:
Red line = on axis response
Brown line = 15o off axis horizontally
Yellow line = 30o off axis horizontally
Green line: -7o vertically
Blue line: + 7o vertically
Looking at the main axis (red), the response is not too bad until about 3kHz, then it drops by 6-7dB at 4-6 kHz, and it climbs about 10dB (!) at 6-10kHz. Clearly the tweeter is a mess.
If you sit lower than tweeter axis (green line) response drops by almost 15dB in the 4-6 kHz region. Ouch!
If you sit higher than tweeter axis (blue line) it gives you the best response but you cannot avoid the increase in the 6-10kHz region.
Long story short, no matter how much you fiddle with placement it is impossible to get close to a flat response.
It seems B&W have decent woofers, but can't get their tweeters or crossover right. Only their top Diamond range is decent.
Unfortunately, they are no longer the company they once were. In 2020 they were bought out by US fund Sound United LLC (parent company to Denon, Polk Audio, Marantz, Definitive Technology, Classe, and Boston Acoustics), who have turned B&W away from traditional hi-fi and more into designer of luxury lifestyle products, headphones, custom installation products, wireless speakers, and audio systems for the television market (like the Panorama soundbar).
gsp