Classe Delta Stereo Preamp

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Delta PRE is the foundation of your perfect system.

Designed to connect to a range of sources, Delta PRE will extract the highest performance from every recording, whether analog or digital.

Pre-amplifiers provide clean and controlled signals to the power stage. Both precision and perfection are required, and are delivered by Delta PRE.

  • Network, USB, AES/EBU, coax and optical inputs with optional HDMI
  • XLR and RCA inputs
  • Short signal paths to minimise signal interference
  • Custom-made Navcom® feet absorb and reduce vibrations
  • High-performance onboard MC/MM Phono stage supports up to two phono inputs
  • Rhodium-plated connectors for excellent and secure contacts

Audiophiles, recording professionals and equipment reviewers trust Classé amplifiers as a source of sonic truth. Delta Series allows listeners to experience that truth in their own homes.

Every detail of the Delta Series is perfected by hand in our unique production facility in Japan to deliver powerful, natural, expansive sound with minimal noise or distortion.

  • 0.25dB volume step precision to find your perfect sound level
  • Digital domain tone control with Delta PRE Tilt control
  • Support for mono or stereo subwoofers for better control of bass
  • Selectable frequency and slope control
  • Advanced five-band digital domain parametric equalization
  • Digital bypass mode available to all analog sources
  • Pass thru mode
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  • Specifications

    GENERAL

    Gain Range
    -93dB to +14dB
    Channel Matching
    0.05dB
    Input Impedance (at 1kHz, BAL / SE)
    50kΩ
    Output Impedance BAL / SE
    200Ω / 50Ω
    Maximum Output Level BAL / SE
    18Vrms / 9Vrms

    BYPASS MODE
    (ANALOG INPUTS, TONE / EQ / SUBWOOFERS DISABLED)

    Frequency Response
    (-3dB, 50Ω source impedance)
    1Hz – 2MHz
    Harmonic Distortion
    (measurement bandwidth: 90kHz)
    <0.0004% at 1kHz <0.0005% at 10kHz <0.0006% at 20kHz
    Intermodulation Distortion
    (measurement bandwidth: 90kHz)
    <0.001%
    Maximum Input Level BAL / SE
    (at 0dB gain)
    9Vrms (+21.3dBu) /
    4.5Vrms (+15.3dBu)
    Signal-to-Noise Ratio (A wtd)
    (22kHz BW, ref 9Vrms)
    130dB (133dBA)
    Crosstalk
    (one channel undriven) (BAL / SE)
    -143dB (100Hz), -140dB (1kHz),
    -124dB (10kHz)

    PHONO SECTION
    (0DB GAIN, BYPASS MODE, XLR2 IN, MAIN XLR OUT)

    RIAA Deviation (20Hz-20kHz)
    < 0.2dB
    Selectable Load for MM Type (47k II)
    50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF, 400pF, 450pF
    Selectable Load for MC
    – Low Output
    7.5Ω, 10Ω, 33Ω, 50Ω, 82Ω, 100Ω, 330Ω, 1kΩ
    Load for MC – High Output
    47kΩ

    MM, MC – HIGH OUTPUT

    Gain (1kHz, 20Ω source impedance)
    41.5dB
    SNR (22kHz BW, ref 5mVrms in)
    86dB (93dB A-wtd)
    Max Input Level
    (overload ref 5mVrms)
    11dB (20Hz), 23dB (1kHz), 34dB (10kHz)

    MC – LOW OUTPUT

    Gain (1kHz, 20Ω source impedance,
    1kΩ load)
    60dB
    SNR (20Hz-20kHz)
    68dB (74dB A-wtd)
    Max Input Level
    (overload ref 0.5mVrms, 1kΩ load)
    12dB (20Hz), 31dB (1kHz), 52dB (10kHz)

    HEADPHONE OUTPUT

    Power
    (nominal input. 0dB gain, 32 Ω load)
    540mW
    Output Impedance
    6.8Ω

    FILE FORMATS
    AND SAMPLE RATES SUPPORTED

    USB-F
    44.1k, 48k, 88.2k, 96k (iOS specific)
    USB-B
    32k, 44.1k, 48k, 88.2k, 96k, 176.4k,
    192k, 352.8k, 384k
    DSD64, DSD128, DSD256 (native –
    requires Thesycon/Classe driver for
    Windows) DSD64, (DoP)
    Ethernet
    WAV, AIFF, ALAC, FLAC, WMA, AAC,
    MP3, OGG_VORBIS (max 192k/24b)
    DSD64, (DoP)
    SPDIF
    (opt, coax, AES / EBU)
    PCM 32k, 44.1k, 48k, 88.2k, 96k,
    176.4k, 192k / DSD64

    INPUT / OUTPUT COMPLEMENT
    ANALOG IN

    BAL / XLR
    2 pairs (XLR2 can be assigned as
    BAL phono in)
    SE / RCA
    2 pairs
    Phono RCA
    1 pair

    DIGITAL IN

    HDMI
    *(optional)
    4* (HDMI 2.0b w/HDCP 2.2)
    USB-F
    1
    USB-B
    1
    SPDIF Coaxial
    3
    SPDIF Optical
    3
    SPDIF AES / EBU
    1
    Ethernet
    1

    OUTPUTS

    HDMI
    *(optional)
    1* (HDMI 2.0b w/HDCP 2.2)
    BAL / XLR
    5 (configurable: 2pairs+1sub,
    1pair+1sub pair,…)
    SE / RCA
    5 (configurable: 2pairs+1sub,
    1pair+1sub pair,…)

    AUTOMATION

    DC Triggers In / Out
    2 sets
    CAN Bus
    1 set in / out
    RS-232 over RJ-45
    1