Sub Pre low-frequency audio signal booster

Gem Tech Bass Booster Sub Pre

Specification
♦   Product code : GT-S001
♦   Power supply : 24-38 VDC dual supply/2 amp max
♦   PCB Size : 70mm x 90mm

Features
♦   Can adjust Frequency from 50Hz to 300Hz.
♦   Can adjust Phase from 0 to 180 degree.
♦   Can adjust Volume Control.
♦   5mm pitch Terminal Block Connectors given for Power, Signal In & Signal out.
♦   47kΩ, 6 Pin, Dual Gang Rotary Carbon Potentiometer 1 no. soldered on PCB for Frequency adjust.

A "sub preamp" typically refers to a preamplifier (preamp) designed specifically for subwoofers. A preamp is an electronic device that amplifies low-level audio signals before they are sent to a power amplifier. In the context of a subwoofer, a sub preamp is used to process and enhance the low-frequency audio signals.

The sub preamp have various features and controls, such as:
Low-Pass Filter: This filter allows only low-frequency signals to pass through to the subwoofer, blocking higher frequencies that are better suited for other speakers.
Phase Control: Adjusts the phase of the subwoofer's output to align it with the main speakers, preventing phase cancellations and improving overall sound coherence.
Gain Control: Allows you to adjust the level of the subwoofer to match it with the rest of your audio system.

Sub pre amps are commonly used in home theater systems and audio setups where a dedicated subwoofer is employed to handle low-frequency sounds, such as deep bass in music or rumbling effects in movies.