New Rebel top 701F stereo balance pre amplifier

Description

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New Rebel top 701F stereo balance pre amplifier
Made in Taiwan
Specifications:
Forms:
dual
mono
preamplifier
crystal
Input Terminals
: XLR balanced
x2
RCA
non-equilibrium
x3
Output Terminals
:
XLR balanced
x1
,
RCA
non-equilibrium
x
Power consumption:
15 watts
Standby power consumption:
10 watts
Size, weight
:
46x7x37cm/12kg
Features:
Employs dual
mono
fully balanced
,
in addition to
share the same power
input
, the internal
is
two
completely independent
mono
preamplifier
.
701F
for
true
full-
balanced circuit
,
but
did not use
the
volume control
of
the
four
-
layer
structure
,
using
two
two
-channel
optical
audio
products
in
Tokyo
,
about
two
knobs
on
the
panel
are
control
volume
used
,
although
the use of
a little
trouble
,
but
to
dispense with
a
potentiometer
to
adjust the balance
can also be
saved
once
signal attenuation
.
The
volume control
for
the end of
the chassis
connecting rod
connected to the
knob
of
the
panel
,
in order to achieve
the purpose
of
the
shortest
signal path
.
The
panel
in the middle
of the dot
in addition to
the
power
indicator light
,
with
a
switching function
of
the
news
source
,
the
light
button
Ke Yi
I
switch
to
Group 2
XLR and
RCA
input terminals
,
not only
more streamlined
panel
design
,
the
operation
is quite
convenient
.
701F appearance of both sides of the arc-shaped panel is very striking, in fact, both sides of the fillet is solid aluminum blocks cut from the middle of the acrylic sheet up to 2 cm thick, fixed in the rear
aluminum plate.
U - shape of the chassis on both sides of aluminum 0.5 cm thick, coupled with 0.3 cm thick rear panel under the cover to form this structure is very solid chassis.
In my own experience, even worth very expensive import level, the chassis rarely do so sturdy, and 701F is completely open-mold making, material from the mold to the chassis alone cost would be "superior", but also
seen "earn less point it does not matter" a little inkling of it!
Balanced design
However, the 701F chassis, heavy and the weight of the machine is not the 12 kg, in fact, the main source of weight outside of the chassis, including two almost contour with the chassis, toroidal transformer.
Why do we use two transformers?
Because the designer to implement a balanced amplifier circuit architecture.
We can clearly find that the 701F's main circuit board is neatly divided into four parts, all parts of the four parts of exactly the same.
This is because the balanced circuit to the audio signal of each channel is divided into the positive half-wave and negative half-wave, respectively, zoom, two-channel, there must be four groups of circuits to work with the complete amplification of signals can be sent over the news source
.
Focus, positive and negative half-wave signal to the end still have to combine into a complete waveform, if the specifications of the part is even the slightest error, amplified waveform will be the original signal is different, that is, the so-called crossover distortion.
balanced circuit is not only used parts of non-balanced circuit twice more demanding parts precision, almost point will sound a lot worse, which is why a fully balanced to expand the main reason of the machine will be more expensive.
Featured OP cost is not cheap
701F mining OP amplification, signal amplification of each half-wave first to AD797, and then the AD811 buffer amplifier, a 701F is necessary to use up 8 OP.
This amplifier is not too special, but the AD811 with ultra-high bandwidth, fast response speed characteristics, the 701F has a good physique on the innate.
Requirements in order to achieve a balanced circuit is highly accurate, Mr. Lu is directly to the United States under a single purchase ANZ Military Class OP, although the cost is not low, but the specification error is minimal, thereby allowing the pairing of trouble to a minimum.
Power is the key
Zoom in addition to the excellent characteristics of the OP, 701F Another feature of the design power.
With the 701F's designer, is also Mr. Lu partner Mr. Lu said, 701F more than 2/3 of the internal parts are used in power processing.
To prepare an independent regulator with a steady flow circuit for each group of the AD797 and AD811, two over-large toroidal transformer, respectively, required to supply two-channel power supply, a transformer and two
winding supply, that is, in the 701F balance framework, four groups of amplifier circuit has an independent power buffer stage amplifier stage and the respective regulator, steady flow, this way, even if the dynamic of the music music
then current requirements and then demanding various parts of the power supply imbalance or tight, will not happen.
Good faith, the big production
Machine operation, in order to better meet the Hi End spiritual, Lu also made a number of specially designed.
701F There are two knobs on the panel with the general concepts to think about, usually a tone volume, and the other a switch news source, but in fact, two are the volume knob, and its benefits immediately dispense volume balance potentiometer
have lost signal attenuation, although the use of a little inconvenience, but also gave up for good sound.
As for the two-channel volume will tune not allowed?
Of course not, because Mr. Lu specially choose a light tone in Tokyo with a scale volume control, you can frame and accurate adjustment, not afraid of the sound is not balanced.
In addition, two Tokyo-ray audio to promote rod can be installed in the place closest to the backplane, so that the shortest possible signal path, in line with the Hi End spirit.
All input and output terminals with the highest quality products and the quality of his terminal, Mr. Lu was originally to do the business of electronic components, audio cables and parts, absolutely no problem.
Selection of wire inside can see that under a lot of effort, such as sterling silver wire, OCC single-crystal oxygen-free copper wire, the light of the needs of the tuning, generous 701F body, December to finally
down, I look at just the cost of the chassis and parts, and probably had more than more than half of the selling price, which may permit Mr. Lu said, "less money does not matter a bit", not only by no means empty words, but also represent his most
excellent value products at an affordable price to bring the greatest sincerity of audio fans.
Dynamic stellar
The actual listening to 701F preamp with the NuForce R9 V2 stage, the reference speaker I've been using PMC LB1s.
System connected to the open sound, I find no small gain 701F at a later time to listen, listen to the majority of the CD volume before switching to the second grid, it has been quite loud (and go to the first 701F
grid when there will be no sound), an information search only to find R9 stage gain is 27dB, be regarded as quite large, and my news source with a small output level bonus under the total gain will be quite
amazing, to match the 701F, it is recommended that you can pick the gain smaller after class, will be a more perfect match.
But then again, as long as the signal to noise ratio controls properly, big gain for listening to music really a lot of advantages, one of the most direct dynamic real natural, a sense of scale, such as listening to Boulez conducting the Vienna Philharmonic, playing Mahler's Fifth Symphony
that DG name plate, "breathtaking" I was only feeling.
Second movement, such as ponley like the beginning of the performance of 701F straight so that reminds me stand to applaud, it will be able to very easily tremendous energy to peak, but also categorically then force cut off, like retractable between
martial arts master, to exercise our powers at ease without reluctance.
It reminds me of Mr. Lu said, the speed is high and the low-frequency amplifier, intermediate frequency slow, if the power supply is insufficient, the low frequency will be slower, but power enough, the band is not only speed, the feeling in a more balanced, details will
richer, and I still can not verify the correctness of these words, but the 701F does have these advantages, and admirable performance.
Balanced amplifier is calm and restrained
Continue to listen to Mahler's Fifth No. 701F of the advantages with the melody after another show.
It is very good at dealing with complex scenes, huge orchestration freely in the 701F driven by throughput, a broad sound field balance to commence in front of the string as the wave-like ups and downs, cool and heavy, it seems that they are infinite energy.
I found the 701F's performance practices not boast the dazzling, but actually each note, each of the ups and downs sing praises, showing the original music, they will naturally nice, and Naiting definitely worth a profound experience.
Listen to the United States violinist had Geng playing Beethoven's Violin Sonata, 701F full of low-frequency to make this live recording is exceptionally cordial, harmonious, distinctive strength of the gap with the melody and downs people feel even more vibrant, natural
pleasure.
I hear that the relative position of the violin and piano is so clear in the sound field, but playing music but extremely harmonious and harmony, I think this is the best interpretation of the musical!
Warm and transparent tone
Then I come up with a heard a few times then shelved the Due d'Accord, dual piano playing, the tracks are the works of Max Reger,
Do not often hear it in addition because the music is less popular, mainly due to old to think that this recording is a bit dry, and low-frequency inadequacies, but did not think the 701F is not only the sound become sweet, and I want a deeper understanding of this composer.
In the under 701F player, the sounds in addition to the original transparency, added to the original Run with the warm sound grain is not only full of dolphin clear the cob.
I feel a huge dynamic changes in the two-piano unison, emotional tension in the music more dramatic ups and downs at the moment, I think, to re-recognize a CD, could be so happy.
Try again fever tablets!
Three Guitar test 701F, my abilities to describe the details of the sound field positioning and sound.
This Three Guitar "Chesky fever recording three guitar masters of folk and classical piano playing together, through the 701F precision personality, the sounds are not only real, audio and video with the contours reveal very like the sense of an entity, as if
larry Coryell, the Badi Assad, the John Abercrombie lined up sitting in front of me (but also a high chair), dedicated to the pop-up dolphin solid, full sound quality both particles, and that they are very subtle changes of fingering, strong
played the surging efforts Zhuyuanyurun the warm atmosphere of three mutual response, or nylon string, steel string, crisp and transparent, a wealth of musical expression, I can not help but high-pitched emotional delight.
The real atmosphere of the scene
Heard here, I am very fun, but that seems to have lacked, and then took out a Led Zeppelin live at the BBC studio recordings, "BBC Sessions".
Press the play moment, an original rock energy immediately spread, not good at 701F modified their emphasis on just thick full yet transparent and bright tone, and the end of the clean, crisp sound, the sub-communicated
The music is essentially.
Even nearly 40 years apart, this time with Robert Plant, Jimmy Page, distance seems to have disappeared, there is only music appeal.
It is hard to believe, only 701F worth of less than six figures, will reach the Hi End models have sound performance, but it seems to perform better.
Is it because the designer Lui turned out to be a genius?
Or because the cock to make such a good machine?
Perhaps is possible, but I think the main reason is that they only concentrate on a simple line to do our best to provide adequate power, all details are exhaustive, they will naturally good voice.
EMS SHIPPING COST
ASIA:90USD
AMERICAN,EUROPE :150USD
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On May-27-10 at 03:52:02 PDT, seller added the following information:
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On Oct-30-14 at 20:33:25 PDT, seller added the following information: