FIR Filter Designer — MiniDSP 2x4HD

📁 Measurements

📊

Drop REW .dat file here or click to browse

Room EQ Wizard measurement files (.dat, .csv, .txt)

🎯 Auto Correction

🎚️ Parametric EQ

✏️ Target Curve

Presets:

Taps

1023

Max 1490 (odd, Type-I)

Target Level (dB)

Low Cut (Hz) High-pass rolloff

High Cut (Hz) Low-pass rolloff

Min Gain (dB)

-20

Prevent extreme boosts

Max Gain (dB)

6

Smoothing (octaves)

1.0

Octave smoothing on measurement

Window

Sample Rate (Hz)

Phase Min-phase reduces latency

DC Offset Remove DC component

Normalize

Add parametric EQ bands, then design the FIR filter from the combined response.

Type	Freq (Hz)	Gain (dB)	Q / BW

Taps

1023

Window

Sample Rate

Define a custom target frequency response. The filter will correct your measurement toward this curve. Click "Apply Measurement as Target" to start from your measured response, then adjust the parameters below.

Target Shape

Slope (dB/decade)

Level (dB)

Smoothing

1.0

📈 Frequency Response

Response

Correction

Before / After

Target

Impulse

Phase

✅ Filter Results

📖 How to Use

Measure your subwoofer with Room EQ Wizard (REW) and export a .dat file.
Upload the file. Multiple measurements can be compared.
Pick a preset or adjust parameters manually. Smoothing prevents over-correction of room modes.
Design the FIR filter and review the response charts.
Export as .data for MiniDSP import (FIR → Import Coefficients).

💡 Tips:

Smoothing is critical — 1–1.5 octaves prevents the filter from boosting into room nulls.
Min Gain of −12 to −20 dB prevents amplifying noise in deep nulls.
Minimum phase conversion reduces group delay by ~60% with slight high-frequency trade-off.
More taps = finer correction but more latency. 511–1023 is usually ideal for subs.
The .data export is raw 32-bit float coefficients — import directly in MiniDSP software.