SPL Pre One

SPL Pre One Overview

Enjoy the open and transparent sound of the SPL Channel One Mk3 in a compact, dual-channel preamp with the Pre One, a desktop unit with two discrete preamps. With a wide gain range of 8 to 62 dB and optional Hi-Z instrument input, you can draw out the full glory of nearly any input source, from condenser mics to passive instruments.

Each preamp features an independent 6 dB per octave high-pass filter for subsonic rumbles, switchable 48V phantom power, and a 180° polarity reversal switch. Each preamp features a selector, so you can choose Flair or Contour, analog EQ presets, and on the rear panel, you have a channel-selectable -20 dB input pad for overly hot signals. Each preamp features a balanced XLR 3-pin mic input and its own dedicated 1/4" TRS balanced output. Preamp 2 also includes a 1/4" TS instrument input (which automatically deactivates the mic input on preamp 2). This design allows the Pre One to process stereo signals if desired. Like all SPL products, the Pre One is manufactured in Germany.

Gain Control

The gain control can be used to adjust the preamplification. The control range ranges between +8 and +62 dB, so even truly demanding microphones can unfold their full potential. Each preamp gets its own large gain control knob. A green signal LED is provided for both preamps to indicate that a signal is present.

Switchable Functions

A high-pass filter with 6 dB per octave is available in both preamp sections and reduces subsonic noise below 80 Hz when activated. This low-cut filter can be used for the microphone inputs as well as for the instrument input on the second amplifier.Both preamplifiers have a 48V switch. This switch activates the required phantom power of 48 volts for the use of condenser and active dynamic microphones. The phase reverse function reverses the polarity of the signal. After pressing the switch, the phase is reversed by 180°.

Perfect Sound with Flair and Contour

For each of the two preamps, Flair and Contour provide an analog EQ preset to perfect the sound. When Flair is activated, it gives the signal a beautiful range of high frequencies; silky highs is the key word here. When Contour is activated, the signal perfectly blends into a compact mix while retaining its natural presence and strength.

Input Pad

The pad switches for each preamp section are located as DIP switches on the rear of the Pre One. These switches attenuate the signal of the microphone input by 20 dB, so that even very high levels can be processed with the Pre One. This is the case, for example, with loud percussion or brass recordings.

Power Supply

Good sound always starts with the power supply. This is where you lay the foundation for the performance of the entire device. Although SPL supplies a 12V plug-in power supply unit, the secondary power supply inside generates a voltage level of +/-17V for the analog audio sections with which professional levels of up to 22.5 dB can be achieved. Elaborate low-drop operating-voltage regulation provides more juice and regulates cleanly even when the maximum operation voltage is reached.

In the Box

• SPL Pre One Dual-Channel Microphone Preamplifier (Black)
• 12V Power Supply
• Limited 2-Year Manufacturer Warranty

Key Features

• For Studios and Audiophiles
• Two Discrete, Transparent Preamps
• Mic and Hi-Z Input on Preamp 2
• Dual 8 to 62 dB Gain Controls
• 6 dB per Octave HPF per Channel
• 48V Phantom Power and Phase Reversal
• Switchable Flair and Contour EQ Presets
• -20 dB Pad per Mic Input
• Separate 1/4" TRS Line Out per Preamp
• Made in Germany