SPL Audio Pre 1

The SPL Pre One is a professional two-channel microphone preamplifier designed for recording studios, home studios, voice-over production, and music recording. Featuring two discrete analog preamp circuits, it delivers transparent amplification with a wide gain range for capturing vocals and instruments with clarity and detail. The second channel also includes a dedicated Hi-Z instrument input, making it suitable for recording electric guitars, basses, and compatible synthesizers. With independent signal-shaping controls and balanced outputs, the Pre One integrates easily into professional recording setups.

Key Features

• Two Discrete Microphone Preamplifiers: Independent preamp channels provide clean, detailed amplification for simultaneous recording of two microphones.
• Wide Gain Range: Adjustable gain from +8 dB to +62 dB accommodates a broad range of microphone output levels.
• Dedicated Hi-Z Instrument Input: Channel 2 supports direct connection of instruments such as electric guitars and basses without requiring a separate instrument preamp.
• 48 V Phantom Power: Individually switchable phantom power supports compatible condenser microphones on both channels.
• 80 Hz High-Pass Filter: A 6 dB-per-octave low-cut filter helps reduce subsonic noise, rumble, and unwanted low-frequency energy.
• Phase Inversion: Independent polarity-reversal switches help manage phase relationships between microphones.
• Flair and Contour Presets: Analog tonal-shaping options provide alternative voicings for enhancing high-frequency detail or achieving a more focused, mix-ready sound.
• −20 dB Input Pad: Rear-panel DIP switches attenuate high-level microphone signals, helping prevent overload when recording loud sources.
• Balanced Line Outputs: Two separate balanced TRS outputs connect directly to audio interfaces, converters, and recording consoles.
• High Internal Operating Voltage: The internal ±17 V analog supply supports professional signal levels and ample headroom.
• Compact Desktop Design: Its small footprint makes it suitable for studio desks, mobile recording setups, and compact production rooms.
• Designed and Manufactured in Germany: Built at SPL’s production facility in Niederkrüchten, Germany.

Technical Specifications

• Product Type: Dual-channel analog microphone preamplifier
• Preamplifier Design: Discrete analog circuitry
• Microphone Inputs: 2 × balanced XLR
• Instrument Input: 1 × Hi-Z jack on channel 2
• Line Outputs: 2 × balanced TRS jack
• Microphone Gain Range: +8 dB to +62 dB
• Phantom Power: +48 V, independently switchable per channel
• High-Pass Filter: 80 Hz, 6 dB/octave
• Input Pad: −20 dB, rear-panel DIP switch
• Phase Inversion: 180° polarity reversal per channel
• Maximum Microphone Input Level: +13.5 dBu at +8 dB gain
• Maximum Instrument Input Level: +23.5 dBu at −6 dB gain
• Microphone Input Impedance: 10 kΩ
• Instrument Input Impedance: 1.1 MΩ
• Output Impedance: 75 Ω
• Frequency Response: 10 Hz–200 kHz at 30 dB gain
• Equivalent Input Noise (EIN): −126 dBu
• Dynamic Range: 117 dB
• THD+N (Microphone, 30 dB Gain): 0.0028%
• THD+N (Microphone, 50 dB Gain): 0.014%
• THD+N (Microphone, 62 dB Gain): 0.017%
• THD+N (Instrument, 0 dB Gain): 0.0039%
• Internal Analog Operating Voltage: ±17 V
• Power Supply: External 12 V DC, 1.5 A adapter
• Power Consumption: 7 VA
• Dimensions (W × H × D): 210 × 49.6 × 220 mm
• Weight: 1.45 kg
• Manufacturing Origin: Germany

Official Manufacturer Website: https://spl.audio/en/spl-produkt/pre-one/