SPL Diamond DAC Pre Amplifier User Manual
- June 1, 2024
- spl
Table of Contents
SPL Diamond DAC Pre Amplifier User Manual
Welcome
and thank you for choosing Diamond.
Diamond is the perfect DAC and preamplifier for everyone who plays music
exclusively from digital sources.
Diamond offers connectivity for five digital sources and an external word
clock.
The superior VOLTAiR technology, in combination with the premium DAC including
DLP120, lets digital players enter soundscapes never experienced before. The
analog volume control guarantees for high-resolution dynamics even at low
volumes.
Getting started
Read thoroughly and follow the instructions as well as the security advices of the Quickstart which is enclosed in the scope of delivery! You can also download the Quickstart here.
Front view
Rear view
VOLTAiR – 120V Technology
VOLTAiR is the synonym for our 120V Technology within the Professional Fidelity series. The audio signals are processed with an unequalled +/-60V DC, which corresponds to twice that of discrete operational amplifiers and four- times that of semiconductor operational amplifiers.
VOLTAiR Technology reaches outstanding technical and sonic performances. Technically especially in terms of dynamic range and headroom and sonically especially in reproducing the finest details and delivering a totally relaxed sounding audio experience. Music sounds absolutely natural.
SPL’s 120V Technology is the internal audio processing voltage (+/- 60V DC).
It is not to be confused with the external mains voltage (e.g. 115V or 230V
AC).
Comparisons
These diagrams show how our VOLTAiR Technology compares to other circuits.
The direct relation between operating level and maximum level is fundamental
for the classification: the higher the operating level, the higher the maximum
level a circuit can handle. And since virtually all essential acoustic and
musical parameters depend on this relation, a higher operating voltage also
has a positive impact on the dynamic range, distortion limit and signal-to-
noise ratio.
Do bear in mind that dB scales do not represent linear but rather exponential increases. A 3 dB increase corresponds to doubling the acoustic power, +6 dB correspond to twice the sound pressure level, and +10 dB correspond to twice the perceived loudness.
When it comes to volume, the VOLTAiR Technology exhibits a performance, in regard to maximum level and dynamic range, that is twice that of common components and circuits given that its values are approximately 12 dB higher.
THD measurements show a difference of more than 8 dB compared to the TL071 at 30 V — in terms of sound pressure level, that corresponds to an improvement of more than 130%. The operating level most commonly used for audio equipment is +/- 15 volts.
Operation
Volume
You control the volume of the analog outputs with the volume knob (4).
The two outputs (RCA, XLR) can alternatively be set to a fixed level (Unity
Gain) with the DIP switches (see DIP switch on page 15).
Source Selection
With the Source switch (5) you select the source – USB, Coax 1, Coax 2, Optic 1, Optic 2 or AES.
Display
After selecting a source, the name of the selected source is first shown in
the display (2) for two seconds (USB, COA1, COA1, OPT1, OPT2, AES).
Two seconds after selecting a source, the display shows further information –
depending on whether the clock of the selected source or an external word
clock is used.
If no signal or no word clock is present, error messages are shown in the
display.
Display after two seconds –
Word Clock: Source
The display shows the first letter of the selected source together with the detected sampling rate (e.g. U384, C192, see table).
If there is no signal at the selected source, the first letter of the selected source will blink – U (USB), C (Coax 1 or Coax 2), O (Optic 1 or Optic 2) or A (AES).
Display after two seconds –
Word Clock: Word
If an external word clock is used, the display shows the letter W together
with the sampling rate (e.g. W 96).
The following error displays are possible:
The source USB does not support external Word Clock.
Word Clock
If an external Word Clock is connected, set the Word Clock switch (3) to the
Word position.
In the Source position, the Diamond derives its clock from the selected
digital source.
DIP Switches
With the DIP switches (8) on the rear of the unit the following settings can be chosen:
DIP switch 1: OFF = The level of the RCA analog output is adjusted with the
volume control.
DIP switch 1: ON = The level of the RCA analog output is fixed (Unity Gain).
DIP switch 2: OFF = The level of the XLR analog output is adjusted with the
volume control.
DIP switch 2: ON = The level of the XLR analog output is fixed (Unity Gain).
Specifications
Inputs and Outputs
Digital inputs
- 6 digital inputs
- AES/EBU (XLR), balanced
- 2 x Coaxial SPDIF (RCA)
- 2 x Optical TOSLINK (F06)
- USB (B)
- 0 dBfs = 15 dBu
- Converter Chip AK4490-Velvet Sound
Sample rates 32 Bit
- Encoded PCM (kHz): 44.1, 48 , 88.2, 96, 176.4, 192, 352.8, 384, 705.6, 768
- DSD: DSD1 (DSD64), DSD2 (DSD128), DSD4 (DSD256)
Outputs
- 2 analog stereo outputs
- Neutrik XLR, balanced, Pin 2 = (+)
- RCA, unbalanced
- Impedance: 75 ohms (balanced)
- max. output level 32,5 dBu
Measurements
- Frequency range: 10 Hz – 300 kHz (-3 dB)
- Crosstalk at 1 kHz: -108 dB
- THD: 0.001 % (0 dBu, 1 kHz)
- Noise (A-weighted): -102.3 dB
- Dynamic range: 134.8 dB
Internal Voltage
- Audio: +/- 60 V
Power supply
- 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: < 0.3 W
Dimensions (incl. feet)
- 278 mm W x 57 mm H x 300 mm D
- 10.95 in W x 2.24 in H x 11.81 in D
Weight
- 3.15 kg; 6.94 lbs (unit only)
- 5.35 kg; 11.79 lbs (shipping)
Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.
Important Notes
Version 1.0 – 11/2022
Developer: Bastian Neu
This manual includes a description of the product but no guarantee as for
specific characteristics or successful results. Unless stated otherwise,
everything herein corresponds to the technical status at the time of delivery
of the product by SPL electronics GmbH. The design and circuitry are under
continuous development and improvement.
Technical specifications are subject to change.
© 2022 SPL electronics GmbH. This document is the property of SPL and may not be copied or reproduced in any manner, in part or fully, without prior authorization by SPL. Sound Performance Lab (SPL) continuously strives to improve its products and reserves the right to modify the product described in this manual at any time without prior notice. SPL and the SPL Logo are registered trademarks of SPL electronics GmbH. All company names and product names in this manual are the trademarks or registered trademarks of their respective companies.
Declaration of CE Conformity
The construction of this unit is in compliance with the standards and regulations of the European Community.