LXmini+2 with PowerBox
Where do I start? Frank Brenner piloted
the LH A380 flight from Frankfurt to San Francisco arriving on a Saturday
before Burning Amp on Sunday, 11/13/16. I picked him up in the afternoon
at the Sausalito Ferry Terminal, still in full uniform and pushing a large
suitcase, bringing a just completed PowerBox and a USB-Reclocker.
We quickly drove to my home to connect his electronics to my laptop,
LXmini and LXsub2. After installation of the driver for the AFI-USB on my
laptop, we had sound and checked with a test recording that there were no
imaging issues. I questioned the need for a reclocker, but bypassing it
showed immediately a deterioration in sibilance sounds. So the reclocker
stayed in and I had learned about a significant jitter effect.
By now it was high time to have dinner.
As always it was lovingly prepared by my wife Eike. And then Frank had to
go to bed. It was actually at 7:30 pm, somewhat past his 6 pm scheduled
time, required to stay on his biological clock cycles. I packed and juggled
all the equipment into my Jetta SportWagen for an early start on Sunday
morning to Fort Mason with all the stuff, a hand truck and three
The sound system was set up in a large,
around 1000 ft2, and highly reverberant 2nd floor room in
Building C at Fort Mason. It sounded great and we had many repeat
visitors. We all left the show elated, but very tired. Frank got to his
hotel before 6 pm for a good night's rest and flew with his two copilots,
crew and 500+ passengers back to Germany on Monday.
Yesterday, on Wednesday, I had time to
listen to the system in the familiar surroundings of my living room and
without the background noise of a show. Wow! I sampled lots and lots of my
demo material and recordings I had not heard in a long time. Wow! I
contacted immediately a good friend, a respected audio recording and
mixing professional, who squeezed in half hour last night to come over and
listen. He is very familiar with the LXmini. He said: Fantastic,
The realism of sound and space is
totally engaging, is emotional and can even be scary in its attacks and
dynamics. I have never heard something like this in my living room. Not
even from the LX521.4. So now I cannot wait to hear what more a PowerBox
Master with a PowerBox Follower might do for the
PowerBox - PowerHouse - PowerAmp
Here are some lessons, which I
- The USB output from the laptop needs to be cleaned up. A properly
designed reclocker can do that. But if the follow-on DSP unit (e.g.
miniDSP4x10HD) has as much jitter as the USB output, then there is no
benefit from the reclocker. AFI-USB
- LXsub2 has a more articulated and seemingly higher volume bass output
capability when driven from the 250W NCore amp, than when driven from the
AT1806 amp. PowerBox
- The sweet spot for listening is closer than for a 300 angle
to each LXmini. The sound stage can be huge and remains so even from
off-axis angles or from a distance.
- When listening from that close, then the LXsub2 should not aim at the
sweet spot. The dipole frequency response equalization boost, which is
applied to the sub, can draw too much attention at very low frequencies to
the sub location. I turned the sub 450, which reduces the
direct sound by 3 dB, but does not change bass output into the living
Frank Brenner at www.magicLX521.com
has done just an amazing job in designing and putting the PowerHouse
together. This is not just a matter of assembling a Hypex DLCP, I/O
interface module, amplifier and power supply modules, but about how those
items are laid out and interconnected in an electromagnetically compatible
order to avoid crosstalk and interference inside and outside of the metal
enclosure. Bruno Putzeys, the designer of those modules, is a dear friend
and like us in pursuit of excellence. He has helped Frank with advice and
suggestions on occasion. Thank
There you have the latest. - I must
now go back to the living room and listen some more.
It's addictive and healing!
of LXmini+2 System
With the LXmini+2 loudspeakers,
PowerBox 6pro and AFI-USB I now have a complete system that is not too
difficult to transport, because it is relatively light and fits into my Jetta
SportWagen. I might be willing to travel to locations inside the Santa
Rosa, Davis, San Jose and Pacific Coast triangle, if there are groups or
individuals, who are truly interested in learning what magic a stereo
system is capable of, when both room acoustics and psychoacoustics have
been considered in the loudspeaker design. I am looking for people
whose passion is music and rendering music faithfully from a well done
recording. I am looking for people, who demand more, than what the high-end
audio industry offers today. I am not interested in status symbol seekers
or the merely curious.
me. Tell me why I should travel to your place, or why you might want to
my place in Corte Madera to hear the LXmini+2 or other systems. I do not consult on
which equipment you should buy or not buy. I see my job as educating about
the sensible and possible in audio. Do not be surprised, if I sow seeds of
Frank Brenner and I plan to have an Open
House in Corte Madera in January, probably Saturday and
Sunday, 1/21 & 1/22, if Frank Brenner can get his A380 flight
schedule aligned with that date.
Watch the "What's new?" page for a firm date.