so you dislike their wireless overpriced joke but have hope with their R series?
why Not just realize kef engineers have lost their ears a long time ago
I have only some experience with KEF.
The ones I have heard are the Muon (a long time ago) and Blade 2 (non Meta) in 2020.
I am curious to their recent coaxial developments and for this reason I am seeking out to listen to the current (2018) R series and Reference Meta.
When do you feel that KEF lost their ears? Which speakers (or brand) do you prefer?
The ones I have heard are the Muon (a long time ago) and Blade 2 (non Meta) in 2020.
I am curious to their recent coaxial developments and for this reason I am seeking out to listen to the current (2018) R series and Reference Meta.
When do you feel that KEF lost their ears? Which speakers (or brand) do you prefer?
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Just circling back on this
Thanks @bikinpunk, who recently measured this.
Reference:
https://www.erinsaudiocorner.com/loudspeakers/kef_ls60/
One of the most enlightening things for me is how maximum SPL is calculated.
KEF may be following CTA2034A guidelines section 9
"Powered Loudspeaker Rating The loudspeaker shall be rated in four different listening levels. This calculation shall use the maximum usable continuous SPL and the voltage required to achieve this SPL in Section 8.1 as its basis. The SPL shall be computed using the following assumptions. 1. Two loudspeakers in a listening room each reproducing uncorrelated signals of approximately the same level. 2. The listening position shall be at 4 meters from the loudspeakers. 3. The listening room is partially reflective so there is a “room gain” of 6 dB compared to the direct sound only....
Calculation Calculate the Maximum In-Room SPL at a distance of 4 meters from two loudspeakers in a room.
For this calculation use the Maximum SPL at 1 m from Section 8.3
SPLIn-Room = MaxSPL + 3 dB (stereo pair) + 6 dB (room reinforcement) – 12 dB (4m distance)
Reference:
Standard Method of Measurement for In-Home Loudspeakers ANSI/CTA-2034-A
The relevance of this, as it pertains to designers, is that the usual maximum SPL taken with a gated log sine sweep, is 9dB less than what CTA-2034A allows.
Erin measured a maximum anechoic SPL of 96dB (@1m). For a pair an extra gain is +3dB. Add 6dB for room reinforcement and this is perhaps how KEF arrived at the maximum SPL chart:
All the modelling done by our friends including my not limited to @nc535 simulate a maximum SPL of 105dB was radical.
To meet the SPL of an LS60 sized system, one needs to reach 96dB @1m (4pi) with an excursion limited SPL of 75dB at 20Hz.
KEF may be following CTA2034A guidelines section 9
"Powered Loudspeaker Rating The loudspeaker shall be rated in four different listening levels. This calculation shall use the maximum usable continuous SPL and the voltage required to achieve this SPL in Section 8.1 as its basis. The SPL shall be computed using the following assumptions. 1. Two loudspeakers in a listening room each reproducing uncorrelated signals of approximately the same level. 2. The listening position shall be at 4 meters from the loudspeakers. 3. The listening room is partially reflective so there is a “room gain” of 6 dB compared to the direct sound only....
Calculation Calculate the Maximum In-Room SPL at a distance of 4 meters from two loudspeakers in a room.
For this calculation use the Maximum SPL at 1 m from Section 8.3
SPLIn-Room = MaxSPL + 3 dB (stereo pair) + 6 dB (room reinforcement) – 12 dB (4m distance)
Reference:
Standard Method of Measurement for In-Home Loudspeakers ANSI/CTA-2034-A
The relevance of this, as it pertains to designers, is that the usual maximum SPL taken with a gated log sine sweep, is 9dB less than what CTA-2034A allows.
Erin measured a maximum anechoic SPL of 96dB (@1m). For a pair an extra gain is +3dB. Add 6dB for room reinforcement and this is perhaps how KEF arrived at the maximum SPL chart:
All the modelling done by our friends including my not limited to @nc535 simulate a maximum SPL of 105dB was radical.
To meet the SPL of an LS60 sized system, one needs to reach 96dB @1m (4pi) with an excursion limited SPL of 75dB at 20Hz.
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