
Preamplificador Densen B-275 SUPERLEGGERA
Descripción
Preamplificador de Referencia B-275: ¡preamplificador de línea de Referencia Absoluta!
Densen now introduces the new top of the line preamplifier; the B-275. The B-275 may mark a landmark leap for Densen, but actually is a well proven design, having being used internally at Densen
as reference for several years. Now when it has become commercially
available, it has been refined to meet the needs of discerning
audiophiles around the world.
Densen has always had a strong
attention to the powersupplies of their products. Over the years this
has resulted in Densen using exclusively their own powersupply
capacitors which are designed specifically for the circuits they are
being used in, instead of relying on standard capacitors. The Densen
powersupplies has always contained several separate supplies, focusing
on clean power to all stages of the products, and the transformers have
always been custommade and most of them encapsulated in epoxy to
minimise vibrations influence on the delicate audio signals on the PCB
board. Now Densen takes these attentions to details to another level,
with the introduction of the Densen B-275.
The Densen B-275 is
the first Superleggera product from Densen. The term superleggera will
not be unfamiliar to conneceurs of advanced sportscars, as this Italian
term, meaning super light weight, has been used to describe the chassis
of some of the best and most famous sportscars ever made.
The
industry standard has been to build bigger and bigger products, with
larger and larger circuits and powersupplies, resulting in cabinets both
holding delicate audioelectronic and massive powersupplies. Densen has
with the Superleggera products divided these into 2, allowing the
audiocircuit to be totally separated from the powersupplies
mechanically, resulting in a dramatic removal of the powersupply
vibrations which will smear the signals of a normal amplifier. In the
B-275 the huge powersupply has its own cabinet, while the delicate
audiocircuit is in the Superleggera cabinet, where everything possible
has been done to reduce the weight and remove vibrations. This has made a
dramatic improvement of the sound, and where huge high end products
normally is associated with dark and slow presentation of music, the
words that springs to mind when describing the B-275 Superleggera is
words like agile, precise, fast, dynamic and natural.
The B-275
simply let the music breath more freely, due to the removal of
unnessesary weight. This is in line with Densens effort in previous
models, where the attention has always been to make a light cabinet, but
here it is obviously taken to extremes with the 2 cabinet solution.
The
powersupply of the B-275 is placed in a cabinet named 2NRG. The 2NRG
contains no less than 3 custommade transformers, each with 2 separate
windings. Each audiochannel of the B-275 Superleggera has its own
transformer and no less than 200.000uF and rectifying by the use of
ultrafast and precise diodes. The third transformer supplies the
microprocessor, display, input selectors and the advance relay driven
volume attenuator. All in all the 2NRG has no less than 510.000uF in the
form of 51 custommade capacitors.
The B-275 Superleggera itself contains further voltage regulation,
allowing a complete removal of interference between each part of the
amplifier. Therefore the B-275 itself contains a further 120.000uF of
powersupply capacitors, and several individual regulations.
The result of all this care to the heart of the B-275; the powersupply, means the B-275 can breathe freely.
An
equally great dedication has been put on the audiocircuits. The B-275
Superleggera uses Densens unique non feedback single ended Class A
topology, for a transparent, dynamic, refined and musically sound.
Extreme care has been taken to avoid compromises. As such the B-275
features Densens advanced microprocessor controlled attenuator. In these
times, digital volume controls are often used in even high end amps.
However digital volume controls, typically contains over 500 components
in a compact microchip, with all the complications this means to the
tiny vulnerable audiosignals. On top of that, digital volumecontrols
typically has poor performance at low signal levels, where they will
have high distortion and time related distortions, resulting in
listening fatigue and lack of transparency and details. And since normal
listening is done at reduced signal levels, and not maximum output,
this actually worsens the negative impact on the sound when using
digital volumecontrols. Densen has therefore never used digital
volumecontrols on all their products, opting instead for an advanced
ultraprecise attenuator. This attenuator is implemented with the use of
Vishay 0,1% lasertrimmed metal film resistors, giving a transparency and
accuracy that is outstanding. Further the attenuator is calibrated by
the user, by an interface with the amplifiers microprocessor. This means
that the microprocessor that also takes care of the B-275s display,
remote, inputselector and DenLink multiroom system, also takes care of
the calibration of the attenuator to the listening level desired by the
listener. The calibration is done in ½ db steps, allowing a high
resolution, securing that the listener can always hit the precise
listening level he desire.
The qualities of this attenuator
should not be downsided, as this is perhaps the most advanced and
precise volumecontrol currently used in the audio industri no matter
price.
Further the microprosessor controls the B-275s option of
installing a analogue surroundboard, which is a board that expands the
B-275 to a true 7+1 analogue preamp, securing a precise and straight
signal path for users who wants to upgrade the B-275 with a DVD or
BluRay with either 5+1 or 7+1 analogue output, and with further
poweramplifiers to control all speakers in such a system.
Audiophiles
wanting to use the B-275 with a gramophone, can convert on of the
B-275s line inputs to either a MM or MC RIAA input by the purchase of a
dedicated phonostage to insert in the B-275.
The circuit itself is implemented using SMD technology, with the
components being mounted with a precision of 0,02mm and soldered in an
artificial atmosphere using nitrogen, to avoid oxidation of the
soldering over time.
The parts are the best possible, resistors
being Vishay metalfilm, the transistors being ultrafast and precise
types, while the capacitors are conventional leaded capacitors but are
Densen custommade film capacitors for the critical parts of the circuit.
All critical parts of the B-275 is encapsulated in metal boxes, to
minimize interference.
The B-275 sets new standards for
preamplifiers, and as Densens head honcho Thomas Sillesen states "for
many years making superb preamps has always been a difficult task for
the worlds high end manufacturers, therefore I am very proud we have
been capable of providing discerning audiophiles and musiclovers with
such an outstanding performer. I know such a bold statement, will result
in the scrutiny of the industry, but we are prepared for that, feeling
we have truly made a preamp that can be cherished for many years to
come”