THORENS TD-150 AB User Manual

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RU}{BLE
AND NOISE
LEVEL:
Runble
is
any
low
frequency
disEurbance
in the reproduction
of
phonograph
record
due Eo the
vibration
of
Ehe
motor
or
Ehe Eurntable
drive
system. Rumble
is
most easily studied
by
playing
a record with unmodulated
grooves
and
observing
the noise
output. The
noise level
present in the records
currently available
is
at
least equivalent
and
in most
cases less than the rumble level
of Ehe THORENS
TD-150
model
turntable.
The objective measuremenE
of the rumble level
of
a
turntable
is not a
s
imple
rnatter.
It requires
elaborate
insErumentation
and exEreme
care.
The
results
may also
differ
with the
measurement
method
employed.
The THORENS
TD-150
model
turntables
are
measured according
to the
DIN
45539
sEandards.
As
an
approximate measure
a
subj
ective
evaluation
of the
runble
level
rrrEly be
observed.
NORMAL
TZED
AUD
IT
ION
COND
IT IONS
Every
subj
ective evaluation
of the rumble
and
noise
level
of
a turntable requires
that
well defined,
audition
conditions
be
real
ized
,
A record should
be
selecEed,
for auditioning,
that
is widely
accepted as
an
excellenE
orchesEra
recording
and
not one
with an overall too low level
and
lacking
bass.
Then,
playing
a Fortissimo
passage,
the
volume
control
should
be adjusted
to
obtain
complete
musical
pleasure,
at
a normal
listening
level without
any
disturbing element.
The
bass
conErol
on
the
preamplifier
should
be adjusted
Eo obtain
as natural a
sound
as
possible.
For
well designed
amplifiers,
Ehis
should
be
aEtained very
near Eo the
theoretical
equalLzation
characEeristics
(tfott
positions
of
Ehe
bass and
treble
controls).
These adjustments of
volune
and tone controls
should
not
be
modif ied f or
the nrmble level
evaluation
which
should
be made,
when a
special
test record is
not
available,
on the
very
firsE unmodulated
grooves
of a
good
record,
before the
groove
where
the recording amplifier
has
been
swiEched
oD,
and then
on a
passage
with the
minimum
recorded
level.
FurEhermore,
the evaluaEion
the room
where best uusical
jusE
near
a loudspeaker.
should
be
made
from the
place in
results
are obtained
and
not

THORENS TD-150 AB Specifications

General

Drive System	Belt Drive
Tonearm	TP 13
Suspension	Spring Suspension
Platter Material	Aluminum
Speeds	33, 45 RPM
Weight	8.5 kg