🔰 BEGINNER LEVEL: Connecting Your Source

Analog Line-Level Input

The simplest connection: head unit RCA preamp outputs → DSP analog inputs.

Signal level: Typically 1–6V RMS depending on head unit. The DSP input stage accommodates this range with adjustable sensitivity.

RCA cable quality: For DSP input connections (relatively short runs, inside the cabin), quality matters less than for long amplifier runs. Standard quality shielded RCA is adequate. Focus budget on the longer power wiring runs.

Mono sum for subwoofer:

If your DSP has separate L and R inputs but you want a mono subwoofer signal, configure the DSP's routing matrix to sum both channels to the subwoofer output:

Sub_out = (Input_L + Input_R) / 2

The division by 2 (−6 dB) prevents overload. Most DSP software handles this automatically in the routing matrix.

High-Level Input (Speaker-Level)

For factory head units without RCA outputs, the DSP connects directly to speaker wires.

The high-level input converts speaker voltage to line-level:

Sensitivity range: typically 1–20V RMS
Input impedance: 30–100kΩ (high, to not load the speaker output)

Where to tap:

Tap at the head unit's speaker terminals, not at the speaker. This ensures you get the full-range signal before any factory amplifier processing.

If vehicle has factory amplifier: Tap after the factory amplifier at the speaker terminals. The signal will have factory EQ applied — plan to correct this in the DSP's EQ section.