SPL PRE ONE

2-Channel Microphone Preamplifier

• Two independent microphone preamp channels, also suitable for stereo recording
• Gain up to +72 dB, sufficient even for low-output dynamic and ribbon microphones
• THD+N of just 0.002% for a transparent and detailed sound
• Extended frequency response from 20 Hz to 50 kHz
• 1U 19" rack-mount format, rugged and easy to integrate into a studio or mobile rack

The SPL Pre One is a two-channel microphone preamp designed for those seeking a clean and reliable front-end for the recording studio. It draws on the expertise of SPL, a German manufacturer with a long tradition in analog electronics for professional audio production, and focuses on a specific goal: capturing the source naturally, without unwanted coloration, leaving the creative choices up to you during the mixing process.

SPL two-channel microphone preamp for mono and stereo recording

The two independent channels allow you to work with two sources simultaneously: vocals and acoustic guitar in the same take, a pair of overhead microphones on the drums, or a stereo setup for piano, strings, and ambient sounds. In the studio, this means fewer compromises and more freedom in choosing your recording technique.

Gain up to +72 dB for any type of microphone

With a gain range of up to +72 dB, the Pre One handles even the most demanding microphones—such as dynamic vocal mics and ribbon models, which require significant amplification to reach a proper working level—with plenty of headroom. With large- and small-diaphragm condenser microphones, on the other hand, you have plenty of headroom to adjust the level with precision while maintaining headroom for transients.

Transparency and Detail: The Sound of the SPL Pre One Preamplifier

Total harmonic distortion plus noise (THD+N) is just 0.002% at 1 kHz and +4 dBu: in practice, the preamp adds nothing of its own to the signal. What you hear in your headphones or on your monitors is exactly what the microphone is actually capturing—an ideal foundation when you want to decide on tone and character later, using dedicated outboard gear or in a DAW.

Frequency response extended up to 50 kHz

The frequency response range from 20 Hz to 50 kHz (+0/-1 dB) extends well beyond the audible spectrum. The practical benefit is a more linear phase response at high frequencies, which translates to well-defined transients and a natural airiness on vocals, cymbals, and acoustic instruments—even when working at high sample rates.

Rugged construction in a 1U 19" rack format

The solid chassis and single-rack-unit design make the Pre One easy to integrate into an existing setup, whether in a studio’s permanent rack or in a flight case for on-location recording. Weighing 3.5 kg, it remains portable without compromising the mechanical sturdiness you expect from a daily workhorse.

SPL Pre One Technical Specifications

• Type: 2-channel microphone preamplifier
• Gain range: -∞ to +72 dB
• THD+N: 0.002% (1 kHz, +4 dBu, unity gain)
• Frequency response: 20 Hz – 50 kHz (+0/-1 dB)
• Form factor: 19" rack, 1U
• Dimensions (W x H x D): 482 x 44 x 250 mm
• Weight: 3.5 kg