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16 17
Summary
As can be deduced from reading this paper, there is
a lot of technology packed into the LS50 Meta, both
new and existing - a culmination of many years of KEF
innovation and acoustic expertise.
All this technology, although tackling legitimate
sound reproduction problems in a scientically
logical manner, is of little use if the listener is not
brought ever closer to sound Utopia - getting more
and more enjoyment and fullment from the listening
experience.
This is probably the best compact passive monitor
that is available today. This is a bold claim, but valid
not just because of the engineering expertise packed
into it, but also because the engineers responsible for
its design, often frustrated musicians, are fully aware
of what sounds good, what sounds bad and what
shortcomings the ear is able to gloss over.
References
[1] M. Yang, S. Chen, C. Fu and P. Sheng, “Optimal
sound-absorbing structures,” Mater. Horiz., vol. 4, pp.
673-680, 2017.
[2] S. Degraeve and J. Oclee-Brown, “Metamaterial
Absorber for Loudspeaker Enclosures,” 148th Audio
Eng. Soc. Convention, 2020.
[3] KEF Research and Development, “R Series White
Paper,” 2018.
[4] KEF Research and Development, “The Reference
White Paper,” 2013.
[5] M. Dodd and J. Oclee-Brown, “New methodology
for the Acoustic Design of Compression Driver Phase
Plugs with Concentric Annular Channels,” J. Audio
Eng. Soc., vol. 57, no. 10, pp. 771-787, Oct 2009.
[6] M. Dodd and J. Oclee-Brown, “A New Methodology
for the Acoustic Design of Compression Driver Phase
Plugs with Radial Channels,” 125th Audio Eng. Soc.
Convention, 2008.
[7] M. Dodd, “The development of the KEF LS50, a
compact two way loudspeaker system,” International
Conference, Helsinki, Finland, 2013.
[8] A. Salvatti, A. Devantier and D. J. Button,
“Maximizing Performance from Loudspeaker Ports,” J.
Audio Eng. Soc., vol. 50, no. 1/2, pp. 19-45, Jan. 2002.
[9] F. E. Toole, “Loudspeaker Measurements and Their
Relationship to Listener Preferences: Part I,” J. Audio
Eng. Soc., vol. 34, no. 4, pp. 227-235, Apr. 1986.
[10] F. E. Toole, Sound Reproduction, The Acoustics
and Psychoacoustics of Loudspeakers and Rooms,
Amsterdam; Boston: Elsevier, 2008.
Figure 40
FEA simulated tweeter impulse response with half-roll surround (top)
and Z-Flex surround (bottom).
Note the improved response, especially close to the unit’s axis
Figure 41
Primary Speaker Rear Panel
Figure 42
Secondary Speaker Rear Pane
LS50 Wireless II
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