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Continuum
Jeff’s take
on a legendary classic
the story
Originally designed to be Jeff's personal reference monitor speaker, the Continuum was
a no-compromise design built around a specific set of design criteria. Based on the
original BBC LS3/5a specification, Jeff's goal was to take this specification to the next
level by incorporating today's advanced loudspeaker technology, design knowledge, and
computer modeling techniques...hence the name "Continuum".
The speaker generated a lot of talk after an audio show in 2007. Since that time several
sets have been built and Jeff continues to receive requests for the speaker. Due to this
growing interest he has asked if we would produce a production version of the speaker.
The monitor is just slightly larger than the original LS3/5a (8"W x 12.5" H x 8.5" D), but
offers significantly greater performance in terms of overall SPL, lower distortion, and
bass output.
the drivers
During development three different versions of the speaker were built using different
drivers and enclosure designs leading to this final version. The final design contains the
best drivers that could be found for fulfilling the requirements of the design.
The 5.25" woofers have a large motor, cast frame, and a mica/carbon filled poly cone. It
solves most of the problems associated with the LS3/5a's woofer, the Kef B110 - with
better bass extension capability, much higher output capability, very low motor
distortion, yet retains a stunningly beautiful midrange. Jeff said he was unable to
achieve this level of bass and midrange resolution with any other driver he tested
regardless of price. This woofer is optimized for the small sealed box and has extremely
low distortion measurements in its operating range.
The tweeter is a 28mm aluminum dome with phase shield, shorting rings and a copper
pole-piece allowing it to offer some of the lowest measured harmonic distortion of any
tweeter available today. It has an Fs of 530Hz and is ideally suited for the low 2nd order
crossover employed. By being a larger dome with high power handling it easily handles
the required low crossover point effortlessly.
The crossover is a second order acoustic crossover at 1.8kHz. The electrical circuit is a
proprietary design that Jeff developed for this speaker that achieves excellent phase
tracking between the two drivers over a wide bandwidth, while also contouring the
response of the woofer to match the target response curve.
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