Denon DA 401 tonearm
The
DA-401 has its effective mass reduced to improve applicability to every kind of
cartridge, and to prevent intermodulation distortion.
Partial
resonance or external vibration is reduced by the dynamic damping mechanism to
attain the original performance of the cartridge.
DA-401 Light Weight
Tonearm (Universal Type)Effective mass of the tonearm reduced to improve
applicability to every kind of cartridge and to prevent
intermodulationdistortion. Partial resonance or external vibration reduced by
the dynamic damping mechanism to attain the original performance of the
cartridge.Low frequency limit rof the cutting on the disc is approximately 20
Hz, therefore, the signal at lower frequencies than that is not supposed to
come out. However, subsonic noise under 4-5 Hz tends to be reproduced larger
due to the warpage of the record disc.For the audio instruments which
originally deal with the audible range signal, signal close to DC is not a
close friend. Such evil effect as modulation distortion is caused on the signal
in the audible range due to the undesirable low frequency range signal being
sent to the amplifier or the speaker. The structure where the tonearm
truthfully moves against the movement of less than 10 or so Hz to forbid the
cartridge to provide output, that is of course attained by minimizing the
effective mass of the tonearm. Yes, tonearm like the ai is what we want, if
possible at all.
Effective mass of
the tonearm including the weight of the cartridge, the compliance of the
vibration system of the cartridge and the cut-off frequency (fL) in the low
frequency range are inter-related. If this (fL) is too low, tonearm can not
perfectly follow the movement due to the warpage of the record disc, etc., and
result inn the vobration of the stylus instead. The desirable setting value of
(fL) is approximately 10Hz. Cartridges available on the market tend to show too
low (fL) when combined with ordinary tonearm. And it will particulary be
difficult to attain the original performance of the high compliance cartridge
sufficiently. In addition to the highly precise mechanism, the DA-401 is
equipped with the lightest possible pipe arm and head shell to reduce the
effective masss to prevent (fL) from becoming too low. The arm pipe is a
solidified hard light alloy pipe, and hard resin for the head shell.Still more
effective dynamics damping mechanism employed for this light weight arm. As it
progresses towards the lighter weight, one side view would reveal the fact that
the mechanical strength in various parts is decreased and result in causing the
partial resonance and deteriorates the sound quality in the mid range. The
dynamic damping mechanism employed for the DA-401 is a structure having damper
rubber of adequate viscocity be tween the tonearm body and the pipe. This
dynamic damping action is the key to the problem of the vibration that could
not be solved inn the past. Now the problem effectively solved, the vibration
transmitted from the arm base is effectively reduced and the result is the
radical reductio in the partial resonance in the part composing the tonearm.
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Specifications
DA-401
Type:
Static balance type, integrated tonearm
Overall
length: 322mm
Effective
length: 244mm
Overhang:
14mm
Tracking
error: Less than 2.5 degrees
Hight
adjustment range: 41-70mm (from arm board surface to arm pipe center)
Stylus
force adjustment system: Dial scale system, 2g per rotation (0.lg subdivision)
Acceptable
weight of cartridge: 4-6g (small weight), 6-10 g (large weight)
Head
shell: Specially rigitized resin, weighing approx. 4g (excluding screws and
nuts)
Output
cord: Low capacitance cord, with 5P connector
Anti-skating
system: Magnetically controlled (disengagement possible)
Arm
lifter: Oil damped
Bearings:
High precision pivot bearings and miniature bearings
Head
connector: Plug-in type with fixing screw, 4P connector (all contact portion
gold plated)
Denon DP-2000 and Da-401