At this year's Burning Amp we
demonstrated the 3-way LXmini+2 loudspeakers with an analog, active
crossover/equalizer (ASP). Nelson had felt challenged to take my original
DSP solution and to approximate its transfer functions with a circuit,
which only uses unity gain JFET buffer stages of very low distortion and
minimal circuitry in his typical Zen-like fashion. Some compromises in the
high frequency equalization where necessary. We made minor adjustments
until we were both pleased with what we heard.
Frank Brenner and I took the transfer functions so
derived and implemented them in a circuit with operational amplifiers,
which is the ASP, combined with 6 Hypex NCore amplifiers in his new
PowerBox prototype. This is what we played at BA-2017.
If we all do not look too happy in the picture on
the left, it is because we have turn-on problems with a second LXmini
system that we brought but had no chance to check out beforehand and which
was to use Nelson's new 3-way pcb. Frank's PowerBox rescued the day.
Nelson's LXmini and LXmini+2 circuit boards and
component kits will become available via diyaudiostore.com/
Charlie
Laub, right, the prime organizer of BA-2017, who we shared the room
with in demonstrating our speakers. He gave us generous time.
This was the best Burning Amp festival that I
experienced. Congratulations Charlie and to the many volunteer helpers.
Mark Cronander even came from Costa Rica. He had to support his baby. And
then there is Nelson Pass, who quietly encouraged everyone in the
organization and who gave most generous material support to the event.
Thank you all!
Also the young are interested ....
I gave a talk with the title
"Baffle diffraction versus neutral sound dispersion"
- (PDF, YouTube)
Mark Cronander - a driving force behind
BA-2017
I had to bring up "box
speakers" and all their problems
Time to pack up, drive
home and rest up.
I could not have done the show this year without
Frank's help and most importantly without my angel of six decades, Eike.
Since she took the photos she is not in any. But
here she is at our beloved Sea Ranch.
I am turning 82 on this Thanksgiving Day and maybe
it's time for Frank (www.LINKWITZ.store)
to carry the open-baffle and neutral-sound-dispersion flag forward.
What you hear is not the air
pressure variation in itself
but what has drawn your attention
in the streams of superimposed air pressure variations
at your eardrums
An acoustic event has dimensions of
Time, Tone, Loudness and Space
Have they been recorded and rendered sensibly?
