SPL Director MKII Black | DAC And Preamp

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Director MKII je referentno pretpojačalo i digitalno-analogni konverter. To je prvi visokonaponski DAC u audio svetu: pretvoreni analogni signal direktno se procesuira u čuvenoj SPL-ovoj VOLTAiR tehnologiji. Budući da je Director srce vašeg stereo sistema, moguće je priključiti razne izvore zvuka na njega. Analogni izvori se povezuju preko balansiranih XLR ili RCA priključaka (npr. Pretpojačalo Phonos) ili digitalno putem USB-a (PCM do 384kHz i DSD do dvostruke brzine), kao i koaksijalnim, optičkim ili AES priključkom.

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OPIS PROIZVODA

The Director Mk2 is the derivative of our reference preamplifier Director:
 
The all new high voltage digital to analog converter now supports 32 bit and sample rates up to 768kHz as well as DSD4.
Fans of analog tape machines or external audio processing can insert their beloved gear in the Tape Monitor loop.
Now there is a total of six analog inputs. Two of which are balanced with XLR connectors.
The housing has grown in height to provide space for the big aluminum volume control with marker LED and two mechanical VU meters.
 
Director Mk2 is the heart of the stereo system to which all components are being connected:
Computer, player, phono preamp like the Phonos, headphone amps like the Phonitor xe or the Phonitor e and power amplifiers like the Performer s800 or Performer m1000 or active loudspeakers instead.
 
Preamplifier
Director Mk2 is a full-fledged stereo preamplifier for connecting up to ten stereo input sources.
Six of which are in the analog domain offering two balanced XLR and four RCA stereo inputs.
Four inputs are in the digital domain: AES/EBU, USB, COAX, OPTICAL.
Power amplifiers or active loudspeakers are connected via balanced XLRs and a headphone amplifier is connected to the Direct Out.
 
Volume
Volume is controlled strictly in the analog domain – for good reason.
Commonly volume is set in the digital domain as part of a DAC chip's functionality. The down side is that the full bit resolution is only present at maximum playback volume.
But we never listen with the preamp' volume turned up fully clockwise. As a result we always listen at a lower bit resolution and therefore with a diminished audio fidelity. An average listening level is about 30dB below maximum (0dBfs) and as the resolution shrinks by 1 bit per 6dB level drop the playback will have a 5dB lesser resolution.
It makes not a lot of sense to listen to high res audio then, does it?
Therefore we opted for an analog solution that gives you full bit resolution at all listening levels.
To control the 120V rail VOLTAiR volume stage we use an ALPS RK27 "Big Blue" potentiometer with excellent feeling and channel matching.
Being motorized Volume can be remotely controlled. Please refer to the chapter "Remote Control" for more information.
 
Sources
The rotary switch selects the input source, which is then shown in the dot matrix display: IN 1 to IN 6 for the analog inputs and AES/EBU, USB, COAX, OPTICAL for the digital inputs.
The detected sample rate of the selected digital input is displayed after about 2sec. (e.g. U768 = USB input, 768kHz sample rate).
The input source selection can also be remotely controlled when the selector is set to "Remote". Please refer to the chapter "Remote Control" for more information.
 
Uber-DAC769 with DLP120
We have been looking at many DAC designs and we have always wondered why all the innovation happens on the digital side. Almost no innovation is to be found on the analog part for the DAC. Maybe that is because most designers have a background in digital engineering and as a result they apply standard 'cook book' designs on the analog side.
We, having a 30+ year background in analog audio designs, find cook book circuitries boring, inefficient and far from being superb. As already proven with the DAC in the predecessor we put innovation into the analog side of the DAC with astonishing results.
The output of the DAC chip is to be filtered with a low pass filter. This stage is typically designed with the same reference voltage that the DAC chip works on e.g. 5V. Think about this: the first stage that the analog waveform is exposed to has a headroom limited this tiny voltage. Now imagine this to be 120V! This is what we have done in the Director and of course in the Mk2.
The mandatory lowpass filter is built in 120V-VOLTAiR technology. The DAC768 features the new DLP120 lowpass filter board that contains two separate lowpass filters. Depending on the digital format the analg signals runs through the PCM or der the DSD filter.
The incredible headroom and the enormous dynamic range lets the analog wavefront come to life and evolve without any limitation. And that is audible. Very much so.
 

Specs:

Analogni Stereo ulazi

  • 2 x RCA, unbalanced (single ended)
  • Impedance: ca. 10 kohms
  • Max. input level: +32,5 dBu

Digitalni ulazi

  • AES/EBU (XLR), balanced
  • Coaxial SPDIF (RCA)
  • Optical TOSLINK (F06)
  • USB (B)
  • 0 dBFS = max. 24 dBu
  • Converter Chip AD1955

Frekvencije uzorkovanja:

  • Encoded PCM (kHz): 44.1, 48 , 88.2, 96, 176.4, 192, 352.8, 384
  • DSD: DSD1 (DSD64), DSD2 (DSD128)

Izlazi

  • 2 analog stereo outputs
  • Neutrik XLR, balanced, Pin 2 = (+)
  • RCA, unbalanced (single ended)
  • Impedance: ca. 1 ohm (unbalanced), 75 ohms (balanced)
  • max. output level 32,5 dBu

Merenja

  • Frequency range (analog): 4 Hz to 300 kHz ( -3 dB)
  • Crosstalk at 1 kHz: -95 dB (analog); -100 dB (digital)
  • THD: 0.0008 % (analog 0 dBu); 0.0004 % (digital -1 dBfs)
  • Noise (A-weighted): -105.1 dB (analog); -96.8 dB (digital)
  • Dynamic range: 137.6 dB (analog); 120.8 dB (digital)

Interna struja

  • Analog: +/- 60 V
  • Digital: + 5 V and + 3.3 V

Napajanje

  • Mains voltage (switchable): 230 V AC / 50 Hz or 115 V AC / 60 Hz
  • Fuses: 230 V: T 500 mA; 115 V: T 1 A
  • Power consumption: max. 40 VA
  • Standby power consumption: 0.7 W

Dimenzije

  • 278 mm W x 57 mm H x 330 mm D
  • 10.95 in W x 2.24 in H x 13 in D

Težina

  • 3.3 kg; 7.28 lbs (unit only)
  • 4.4 kg; 9.7 lbs (shipping)

 

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