SPL Diamond Premium DAC/Preamplifier with VOLTAiR tech (Red)


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SKU: Diamond Red
Brand: SPL



Premium DAC with VOLTAiR technology.

Diamond is the perfect DAC and preamplifier for everyone who
plays music exclusively from digital sources. Diamond offers connectivity for
six digital sources and an external word clock. The superior VOLTAiR technology
and the premium DAC with the unequalled DLP120 combined with an analog volume
control allowing for highest resolution at any volume makes the Diamond an
one-of-a-kind DA converter that delivers finest soundstages with an unrivalled
analog feel.

Everything under control

The volume is adjusted with a solid, milled aluminum, rotary
knob. The Alps RK27 “Big Blue” potentiometer gives a pleasant “spoon in the
honey” rotary feel.

Source of joy

Up to 6 (!) digital stereo sources can be connected to Diamond.

Diamond offers each a stereo USB and AES input as well as
each two optical and coaxial stereo inputs. Via USB, both PCM audio and DSD
audio can be converted. PCM audio is received in S/PDIF format, both coaxial
(RCA), optical (Toslink F06) and balanced (AES/EBU). 

The source selection is done via the selection control on
the front. The selected input is also shown in the dot matrix LED display: USB,
COA1, COA2, OPT1, OPT2 or AES.

After approximately two seconds, the display shows the type
of clock source and the detected sampling rate.

Always in time

Diamond can not only synchronize to the clock integrated in
the digitally fed source signal.

As a specialist for digital players Diamond offers a word clock input. The
source of the 
clock signal can be selected via the CLOCK switch.

Source = Diamond synchronizes to the digital clock in the
source signal.

Word = Diamond synchronizes to the digital clock present at WORD IN.

Well informed

The DAC automatically picks up the sampling rate and
resolution of the digital playback source. No matter if a streamer, computer,
CD player or an external word clock is connected.

The detected sampling rate and the selected clock source are
shown in the dot matrix LED display. For example, U768 is an acronym for a
clock signal in the USB stream with a

sampling rate of 768 kHz.

All variable – or Slave Thru

Diamond provides two stereo output pairs for connecting
power amplifiers or active loudspeakers. One pair of outputs with XLR, the
other with RCA outputs. Both have the same output signal, which is controlled
by the volume control on the front panel.

The volume control for both outputs can be individually
switched out of the signal path via DIP switch on the back of the device. For
example, a headphone amplifier with its own volume control can be connected to
one of the outputs.

The DAC768

The highly acclaimed AKM AK4490 Velvet Sound™ premium DAC
chip is used as the converter chip in the digital-to-analogue converter, which
thanks to its architecture reproduces the finest sound details.

It converts PCM audio with a resolution of 32 bits and a
sampling rate of up to 768 kHz, which is equivalent to 16 times CD resolution.
Direct Stream Digital is also supported up to a resolution of DSD4 or DSD256.
In contrast to the DAC 768xs, the DAC768 not only offers an AES/EBU digital
input, but also the SPL DLP120 with VOLTAiR technology.

The DLP120 (Dual Low-Pass)

The analog output of the DAC chip must be filtered by a low
pass filter. Phonitor xe has two of them: One for PCM audio and one for DSD
audio, since different roll-off frequencies are required.

In contrast to all other DACs in the world, the low pass
filters here are built using VOLTAiR technology, which provides a plus in
dynamics and headroom and sound.

Sounds good

With all devices of the Professional Fidelity series we
develop not only according to plan, but also by ear. Many important components
are installed on the circuit boards using Through-hole technology. This way we
can ensure that we can use the best sounding components.

The VOLTAiR Technology

The 120V technology is our reference technology. The 120V
technology is unique in the world. It operates at a DC voltage of 120 volts.
This is four times that of IC-based semiconductor op-amps. In our Professional
Fidelity series, we refer to this unsurpassed technology as VOLTAiR technology.

The highest possible audio quality requires the highest
possible audio operating voltage.

The 120V technology works with +/-60 V. To be able to handle
such a high voltage, we have developed special proprietary operational
amplifiers that can operate with a DC voltage of +/-60 V: the SPL 120V SUPRA
operational amplifiers. This high voltage would destroy conventional
components and operational amplifiers.

The 120V technology achieves exceptional technical
specifications and sonic benefits. Technically, in terms of dynamic range,
signal-to-noise ratio and headroom. Sonically, in terms of richness of detail
and an absolutely relaxed listening experience. 

By the way, the “120V” in the name of the technology has
nothing to do with the local mains voltage from the mains power socket. This is
about the operating voltage inside the device with which the audio signals are

The mains voltage from the mains power socket is transformed
to the required secondary voltage in the device’s internal linear power supply
with toroidal transformer. Rectifiers convert this AC voltage into DC voltage
required in the audio device.

VOLTAiR is a composition of the terms Volt and AirVolt is
the unit for electrical voltage and Air stands for the
unlimited space the music can breathe in.

VOLTAiR symbolizes the perceived limitless
dynamics resulting from high audio voltage.


Most audio devices work with an internal operating voltage
of +/-15 volts and can thus process a maximum input level of +21.5 dBu. If a
DAC, for example, has an output level of +22 dBu at 0 dBFS, level peaks of the
music material would already cause overloads in the input stage of the device.
All components in the audio device often operate at their limits. The result is
an unsteady sound that causes stress and faster ear fatigue.

SPL devices with VOLTAiR technology can handle input levels
of +32.5 dBu thanks to the higher internal operating voltage of +/- 60 volts –
thus offering 12 dB more headroom. All components consequently operate
continuously in the optimum operating range. The result is a very pleasant,
natural and relaxed sound experience. So you can enjoy your music in every

Home is where the heart is

That’s why we manufacture all devices in our own production
facility in Niederkrüchten on the Lower Rhine, Germany.

Analog & Outputs: XLR (balanced), RCA
Maximum output level

(0 dBFS = max. +15 dBu)
32.5 dBu
Output impedance
75 Ω
Frequency range (0 dBu)
10 Hz – 100 kHz
Crosstalk (0 dBu, 1 kHz)
-108 dB
THD & N (0 dBu, 1 kHz)
0.001001 %
Noise (A-weighted)
-102 dBu
Dynamic range

(0 dBFS = +15 dBu => 117,3 dB)
134.5 dB
Digital Inputs, DAC768
AES/EBU (XLR), PCM sample rates
44.1/48/88.2/96/176.4/192 kHz
Coaxial SPDIF (RCA), PCM sample rates
44.1/48/88.2/96/176.4/192 kHz
Optical SPDIF (Toslink F 06), PCM sample rates
44.1/48/88.2/96/ with Glass fibre <1m 176.4/192 kHz
USB (B), PCM sample rates
44.1/48/88.2/96/176.4/192/352.8/384/705.6/768 kHz
USB (B), DSD over PCM (DoP), sample rates
2.8 (DSD64), 5.6 (DSD128), 11.2 (DSD256) MHz
0 dBFS calibrated to
15 dBu
Internal Linear Power Supply with Shielded Toroidal
Operating voltage for analog audio
+/- 60 V
Operating voltage for relays and LEDs
+ 12 V
Mains Power Supply
Mains voltage (selectable, see fuse chamber)
230 V AC / 50; 115 V AC / 60 Hz
Fuse for 230 V
T 0.5 A
Fuse for 115 V
T 1 A
Power consumption
max. 40 VA
Stand-by power consumption
< 0.3 W
Dimensions & Weight
W x H x D (width x height incl. feet x depth)
278 x 57 x 300 mm
11 x 2.24 x 11.81 inch
Unit weight
3.15 kg
6.95 lbs
Shipping weight (incl. packaging)
5.35 kg
11.79 lbs
Reference: 0 dBu = 0.775V. All specifications
are subject to change without notice.

Additional information

Weight 0.00000000 lbs


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