||HD53R:47,250 yen(including tax, September, 2005 release)
|HD53Rver8.0:68,250 yen(including tax, September, 2005 release)
Headphone amplifier of the refinement model which supplied
technology, such as an original LEF circuit and IGM volume control, and also to
which the polish was applied.
Two independent headphone amplifier is
carried and it has become the amplifier only for headphone in which volume adjustment is possible at each.
By carrying a LEF (Load Effect Free) circuit
original with CEC, the signal circuit without negative feedback was formed and
high-quality-sound-izing and efficient coexistence are realized.
time of headphone use, the play by pure Class-A operation is possible.
Moreover, speaker connection is also supported though it is the amplifier
only for headphone.
The mass toroidal transformer of 50W is adopted as a
Wide range impedance (16ohm-2kohm) is supported, and correspondence is aimed at also to efficient headphone by low impedance by
having carried the Input-sensitivity changeover switch of the three-stage
(+6dB/0dB/-12dB) in the back.
In order to make the loss at the time of
volume control into the minimum, newly developed IGM (Intelligent Gain
Management) is adopted, the gain itself is controlled with the knob of the front
panel, and volume is adjusted.
Since an incoming signal does not go via a
mechanical volume resistance machine or Attenuator, and CMOS type volume, it has
improved the S/N ratio and the distortion greatly.
The input terminal
carries the XLR (balanced type) terminal other than the usual RCA (imbalanced
type) (it is with an input changeover switch to a rear panel).
headphone output supports 3.5mm and 6.3mm, and connection up to two sets is
simultaneously possible for it.
There is higher rank model HD53Rver8.0
which carries the newest amplifier module which consists of a part selected more
carefully, and upgrade from HD53R is also supported.
||20Hz-20kHz+0 -0.2 dB
||Headphone: 0.009% (32 ohms, 1Vrms input, 0dBu output)
Speaker: 0.09% (8 ohms, 2Vrms input, 1W output)
||98dB (1Vrms input, 0dBu output)
||Headphone: 1W (6.5Vrms, 150mA)
||Two lines (XLR balance type one line, a RCA
imbalanced type one line)
||Headphone: Two lines (6.3mm/3.5mmx2)
Speaker output: One line
|Power supply voltage
||Width 218x height 57x depth of 258mm(A terminal and a button are not includeded.
RCA-mini plug conversion cord
||Upgrade to Ver.8.0 from HD53R (21,000yen)