second plot as measured with the Sprayplan
ceiling by the company Warmteplan. Above the
roughly 400 Hertz very nice within the ideal
(green) lines. We could not imagine it having
such a large and broadband effect. And the
spray ceiling is also a very aesthetically
pleasing solution. Incidentally, experience
has shown that an absorbent ceiling and a
neutral floor (in this case quartz particle
epoxy) are preferable, which is at odds with
the most common situations. The thickness
of the SprayPlan ceiling s 15 mm. Please
note that the area from roughly 80Hz to around
400Hz is a very essential area of voice and
the Midrange begins and/or the Bass stops
remains debatable, but we may agree that the
human voice should preferably be kept homogenous,
as a whole. Consider then that the Male
Bass reaches about 100Hz and the Female Soprano
reaches about 1050Hz. A common
error with larger three-way systems is that
the woofer continues working above 80Hz precisely
because a too small midrange unit is used.
higher frequencies are easier to influence,
but laws of nature cannot be circumvented:
lower the frequency, the larger the object
will have to become to absorb it.
third plot with additional diffusers and basstraps*.
It takes quite a lot to get the graphic line
down in the lower frequencies. We could add
some more bassstraps, but the effect is already
substantial so we choose not to use any more.
The placement and therefore the interaction
with the speakers also have an effect on the
reproduction. Meanwhile (Q3 2016) the plan
has been made to install 12x Stockholm Optifusor
units, mainly at the location of the first
looks as if the curve is still not quite right,
but this concerns 10 to 15 Milliseconds, and
although not perfect, it is marginal indeed.
More important: the space still retains plenty
of clarity and life. However the primary reaction
in the listening chair is always the same:
2 tubetraps of Ø50 x 125 cm. 2 tubetraps
ofØ40 x 125 cm.
Stockholm diffusers were installed at the
end of 2016 and with particularly good results.
Dimensions per side 180 high 240 wide. It
has been estimated that almost two more months
have been spent on the modular frames and
painting. This painting is a gain concerning
the non-absorption. The subjective experience
with large diffusers left and right is like
putting on headphones. The speakers are instantly
harder to locate.
so-called room in a room has been created
here. The Basstraps and Stockholm Optifusors
can be used as mobile castors and are stored
in a separate storage. In this way a dedicated
listening room is possible in about 5 minutes
six years, things can change and evolve. In
the meantime Toine has measured the current
situation again after a major renovation,
the passage at the back wall to a corridor
and office has been completely closed. The
wall of 21 square meters now consists of natural
stone, which also acts as a very mild diffuser.
graph above shows curves at a certain sound
level (SPL). The curves show the selective
sensitivity of the human hearing. The reference
point is set at 1000 Hertz. The least audible
sound pressure (hearing threshold) is expressed
on baseline p0. Around 3000 Hertz is the loudest
frequency for the human hearing.
curve indicates how much more dB is needed
to subjectively experience the same sound
pressure (SPL), we see that below 500 Hertz
the curve is quite slanted, and from 5 Khz
to about 10 Khz there is the same effect.
This phenomenon explains to a large extent
the subjective experience that speakers with
a broad bass hump around 100 Hertz are experienced
as 'musical' and with 'body' in the listening
room at home. The counter effect is that speakers
which measure almost linear in a dead room
are more often experienced as thin sounding
in the actual home situation.
measurement also provides insight into the
why of the Loudness Compensation. This is
used to compensate the hearing curve at lower
SPL's in particular.
above frequency measurement graph is of the
+ Basso Submonitor loudspeaker.
This curve shows an ideal Loudness Compensation.
The dip is exactly at 3000 Hz and the hump
is around 100 Hz. The theoretician will look
at this design very differently (the ruler
flat) than the acoustician. The actual listener
at home will hear that this speaker sounds
very good... The Capriccio is a design by
Joseph Szall, not exactly a novice in this
Speakerplacement by Allen Perkins
Physik den klang verbessern; Rainer Muller
Deeper Note on the Subwoofer Subject
anyone buy these loudspeakers at a retail
price of 116500 euro ?
then use one Subwoofer ?
XY problem is asking about your attempted
solution rather than your actual problem.
This leads to enormous amounts of wasted time
and energy, both on the part of people asking
for help, and on the part of those providing
- User wants to do X.
- User doesn't know how to do X, but thinks
they can fumble their way to a solution if
they can just manage to do Y.
- User doesn't know how to do Y either.
- User asks for help with Y.
- Others try to help user with Y, but are
confused because Y seems like a strange problem
to want to solve.
- After much wasted time, it becomes clear
that the user wants help with X, and that
Y wasn't a suitable solution for X.
problem occurs when people get stuck on what
they believe is the solution and are unable
to step back and explain the issue in full.