R50 is a high grade phono preamplifier developed and
handcrafted elaborately to re-render
full music spirit and connotation,whose design
reference benchmark is state of the art counterpart
the top hi-end phono preamplifiers’
performance, tone,
function, construction and fabrication.
●True balanced cartridge interface
Two input pairs are provided for use with balanced
(2 pr. XLR) or single-ended (2 pr. RCA) sources. The
term "balanced" describes a system in which the
audio signal is transferred via two shielded
symmetrical conductors, neither of which is
connected to ground. When the input port is selected
as the XLR, the R50 present true balanced interface,
or present as single end interface when switched to
RCA.
when the extremely-low signal levels of cartridges
input to R50 by with XLR port, it becomes clear that
the interference signals such as hum, RF, noise etc
will not be carried by the shield(ground paths) or
in some way is exposing the signal to the ground
carrier.
The true balanced signal interface to the
preamplifier is a huge improvement over presently
available designs. A performance balanced system was
always faced with a number of technical problems. In
the R50 these limitations have been overcome
entirely.
Two inputs (XLR 3pol. Female or RCA), can be
configured both as MM or MC versions by the (MC
or MM) cartridge load card. Thus, it supports
the connection of record player with two different
cartridges or the connection of two record players,
each having a different cartridge (MM/MC).
●
Subsonic filter
In order to achieve best sound results even for old
or wavy records,
R50 employs a Linear-Phase subsonic filter which
attenuates the sub-audio frequencies whilst having
no effect on the audible signal.
●
Select able input resistance/input capacitance
The input resistance of the MC version can be
adjusted via the DIP switch on the MC
cartridge load card. Thus, impedance can be
adjusted to matching any cartridge. This certainly
also applies to the
adjustability of the input
capacity in the MM version(input
resistance fixed at 47 Kω)via
the DIP switch on the MM cartridge load
card. The input sensitivity will be selected
automatically by the(MC
or MM)cartridge
load card.
●
Select able gain
The gain of the R50 can be adjusted as Low,
Middle and High by the Gain
switch in 6dB step. This switch is used to more
closely match your preferred volume setting on your
line preamplifier. When using modern very low output
cartridges, it is recommended to try setting this
switch to High GAIN. Or you might try the
Low GAIN position to ensure you are not
overloading the input of your line preamplifier.
●
Dual mono design
As might be expected, the R50 uses a dual mono
design that isolates each channel from the other. We
use separate power supplies for the two audio
channels in R50. In fact, there is an aluminum wall
between the two channels in the R50 phono
preamplifier, separating Left from Right channels
physically as well as electrically.
●
Construction
Regardless of the technology used, numerous details
must be executed to fully realize the potential of a
Dussun design. The quality of individual components,
the care and craftsmanship with which they are
assembled and the exhaustive inspection and testing
we employ help raise the value of Dussun products.
The R50 is built to the same high construction
standards as all other Dussun products.
In addition to yielding the best performance,
careful attention to details is the secret of
achieving both reliability and longevity.
Specifications:
Inputs: |
two pairs balanced on XLR
two pairs single-ended on RCA
(both select able for MC and MM) |
Outputs:: |
1 balanced,1
single end |
Input
Impedance For MC: |
3Ω,10Ω,30Ω,100Ω,300Ω,1kΩ |
Input
Capacitance For MM: |
47,100,150,200,470,600(pF) |
Gain (select able) : |
MC:58dB(Lo),64dB(M),70dB(Hi)
MM:28dB(Lo),34dB(M),40dB(Hi) |
Input
Sensitivity:
(at
rated output:1 kHz, -10Dbv) |
MM:12.6mV(Lo),6.3mV(M),3.2mV(Hi)
MC:0.40mV(Lo),0.2mV(M),0.1mV(Hi) |
Input Overland Margin: |
MM:180mV,
MC:7.5mV |
Output
Impedance: |
100Ω Balanced,
50Ω single end |
Hum and Noise:
Equivalent input noise
(MC/64dB) |
51nV (-143.6dBu) A-wtd,
189nV (-132.2dBu) Flat,20
Hz to 20 kHz |
Signal to Noise Ratio:
(Ref.
2Vout) |
MM(Gain
M):104dB
A-wtd
MC(Gain
M):88dB
A-wtd |
RIAA Accuracy: |
20-20,000 Hz ±0.5 dB |
Maximum
Output Level: |
6 Vrms |
Crosstalk,L to R or R to L: |
-100 dB or better 20 Hz to 20kHz |
THD: |
less than 0.01% at 6Vout |
Input stage CMRR:
|
86dB(20
Hz to 20 kHz) |
Subsonic Filter: |
–12 dB/octave,
10 Hz Linear-Phase Filter |
Overall
Dimensions: |
440(W)×84(H)×290(D)
mm
17.32(W)×3.3(H)×11.42(D)in |
Shipping
Weight: |
19 kg(41.9 lbs) |
|