Changing Filter Characteristics, Butterworth, Bessel, Linkwitz

[Rabbit]

Hopefully, this isn't a too silly question and hopefully, I can explain myself clearly

I have noticed of late that REW uses the Characteristics of a Butterworth filter at the crossover slopes, for example, if I was to set the target level at 100 dB, the LF cutoff at 1000hz with 24db slope, the roll of would start at approx 1600hz and at 25db down it is around 487hz, which is a match for my DSP

If however, I set the DSP to a Bessel slope with an LF cutoff at 1000hz with 24db slope, then the roll of starts at around 3500hz and at 25db down it is around 330hz.

No matter what I try in REW I am unable to change the filter characteristics from Butterworth to Bessel (or Linkwitz) to match the DSP. From doing a help search I can see that they are supported in Generic Equaliser, but how you actually change them in the is a complete mystery. I'm a novice at best when it comes to REW so apologies if this is a really stupid question

 

[jtalden]

The EQ window in the recent REW beta versions allows selection of those filter types when EQing drivers independently. Is that what you need? Your equipment list doesn't hint that you are working on DIY XOs.

 

[Rabbit]

Thanks @jtalden that is indeed what I was after BE4 and LR4 are a near-perfect match for the helix dsp.

The equipment list just has my home side of things, not my van side which is where I'm mainly using REW now to eq my active 3-way speaker setup with a Helix MK2 Pro DSP which has lots of options, apologies I should have said. Learning loads from doing so and appreciating REW more and more as a result.
As I've been using REW for car/van eq'ing I have been following the advice that is out there (written before the new option) and have been selecting subwoofer or bass limited as the target type so the option you showed via the picture (many many thanks for doing that) has never come up before. A picture truly is worth a 1000 words