(1954 - 1975)
owner here !
Well... I don't use my JansZen anymore but did for about a decade,
with much pleasure.
own were a swiss version manufactured by Zürich-based BOPP
in the early 1970s: the filters were built far better than the originals
from Neshaminy and the enclosure was sturdier. The EMT woofer wasn't
very good however and as its surrounds started to disintegrate,
I swapped them for fast Fentons which had the added advantage to
not be too efficient - for a better match with the cells' fairly
low SPL. The BOPP Model 704, like the
original JansZen Z-410HP,
wasn't free of annoyances but careful room-matching
(tedious but worthwhile) and some tweaks helped a lot.
problematic was a pronounced dip in frequency response between the
25cm woofer and the JansZen array, around 700Hz. Also, the sweet
spot was rather narrow - make that quite narrow. If the use
of a Behringer parametric EQ treated well the first problem, the
sweet spot... nobody could change that :) The need for a very
powerful amplifier was taken care of with the use of first a Marantz
SM-80 and then a Sony
TA-N80ES. But when I decided to restore my Model
704, re-do the filters, go with bi-amplification and all
that, I bumped on quite a few disagreable things, the largest of
which was the very price of such a restoration :(
I sadly had to drop the matter, and the JansZens, to pursue my music
listening with more user-friendly loudspeakers... But I do regret
the wonderful qualities of the JansZen cells: speed, definition,
depth. I still have the eight cells, just in case I were to feel
like launching a DIY hybrid system - someday.
present JansZen company is doing well and has a very complete history
section on its own website.
You should be able to find almost everything about all JansZen loudspeakers
(and variants) at The
Audio Circuit, website of which I was an early contributor regarding
JansZen (some twenty decades ago).