10-24 V Subwoofer Low-Pass Preamp Board

Prepare a low-frequency signal for a separate subwoofer power amplifier. This compact board provides a low-pass preamp stage from a suitable single DC supply.

✅ Send the bass portion to the next stage - Low-pass filtering separates the intended low-frequency signal for the downstream amplifier.

✅ Use mono or stereo input arrangements - The board accepts a suitable mono or dual-channel input and provides a mono output.

✅ Keep the supply arrangement simple - A single 10-24 V DC supply suits a correctly designed preamp installation.

✅ See that the board is powered - An onboard LED provides a power-state indication.

A Preamp Does Not Drive the Speaker Directly

The board requires a separate power-amplifier stage between its output and the speaker. It is not a complete powered subwoofer or a speaker-level amplifier.

The NE5532-based board is approximately 78 x 32 mm with a 22-300 Hz frequency-range description. Match input level, wiring, grounding and supply polarity to the full audio design.

Technical details

• Low-pass subwoofer preamp
• DC 10-24 V single supply
• NE5532 op-amp
• Mono / dual-channel input
• Mono output
• 22-300 Hz range
• Approximately 78 x 32 mm
• Power amplifier and speaker separate

Add the preamp stage your correctly designed bass system needs.