ATTENTION, misleading LXmini YouTube
video: Substantial deviation between the original LXmini acoustic response
curves and the curves, published on YouTube! The LXmini on YouTube is like a
different loudspeaker and cannot be considered as an original LXmini.
If you use a miniDSP unit with pre-loaded filters, make sure, that the
electrical filter curves do not deviate from the original curves (the original
curves are published in the LXmini plans, use e.g. ARTA or REW to verify)
Reference Loudspeaker has received much applause from music lovers all over the
world. But it has also caused disappointment because it requires a fair amount
of space and breathing room, which many housings do not provide. On top of that
the LX521 is too expensive for many and/or its acoustically defined shape is not
pleasing to someone in the household. Such objections are particularly
aggravating, when the near life like sound volume capability, for which the
LX521 was designed, is neither wanted nor could be tolerated in the given living
space, or if they were willing to give up bass below 45 Hz for a much smaller
In the past I would have recommended to build PLUTO
2.1 instead of the LX521, but now the LXmini will exceed what PLUTO 2.1 had
to offer and be a true alternative to the LX521, except for the bigger speaker's
extended bass. The low frequency portion of
the LXmini's frequency response is similar to the PLUTO's. With a
700 Hz LR2 crossover to a small, full-range and open-baffle driver, and with a
diffusing as well as attenuating structure for controlling the rear radiation,
the polar response tends towards cardioid behavior and reduces reflections from
objects behind the speaker.
With directivity controlled in this way the LXmini becomes
much less sensitive to room placement, while also gaining in 3D imaging
precision. The small, full-range driver on top is superbly smooth and detailed. It blends
flawlessly with the pistonic, infinite transmission line woofer for a completely
neutral sound in a reverberant room. The speaker stands 40" (1 m) tall. It
requires two stereo power amplifiers of 80 W for woofer and full-range drivers.
The four input signals to the power amplifiers are generated in a miniDSP 2x4
processor from the left and right outputs of a preamplifier or other device with
a volume control.
The LXmini is a most remarkable
loudspeaker. It converts electrical signal voltages into acoustic pressure
variations, which are perceived as completely neutral and detailed even in a
reverberant environment. With this design I want to give every music lover the
opportunity to build and enjoy a reference quality sound system singing in their
own living space.