Last updated on April 18, 2023

Creating a multiband linear phase crossover

On the original track, uncheck “Master send” in Reaper’s routing options.
Send it to an aux.
On this aux, create your crossover filters with linear phase filters.
- With one instance of Pro-Q 3, create a low-pass and route it to channels 5 and 6.
- In another instance of the same, create a high-pass and route it to channels 3 and 4.
Send the low-pass to an aux track for lows.
Send the high-pass to an aux track for highs.
Send the full range signal to an aux track for mids, then route the lows and highs with their polarity inverted, which will null those bands.
Season each band to taste.¹

I use a two-band crossover for bass processing.

To create a matrix for bass DI and amp do the following:

Have the DI route to channels 1 and 2 to the crossover then out on the same channels.
Route the amp to channels 3 and 4 on the crossover then out the same.
For the DI, send channels 1 and 2 to the low band.
For the amp, send channels 3 and 4 with their polarity inverted to the high band, along with the full-range signal.

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