Help with biquads for Revel M106

[mrlawng9]

Hello! I'm redoing my father's media room as a gift to him. I've recently upgraded him to a MiniDSP Flex HT and am integrating a pair of Revel M106s with a pair of SVS SB1000 Pros. I've just run out of EQ blocks and would like to use biquads in the crossover. My understanding is that I have 8 total biquads and a LW24 crossover will cost me two biquads. This leaves me with 6 biquads left for EQ.

Having downloaded the minidsp biquad spreadsheet, I will have no problems generating the EQ biquads I need. But the crossover has proved to be a bit more challenging. I do not know the F and Q of the Revel, nor do I know how to setup the spreadsheet (e.g. Q) for a 4th order crossover at 60hz (yes - it's a low crossover, it's not a great room and that crossover helps me achieve the target and crossover frequency I'm using).

I'd be very appreciative if any forum members could help me out with this.

Thanks!

 

[NTK]

...
nor do I know how to setup the spreadsheet (e.g. Q) for a 4th order crossover at 60hz (yes - it's a low crossover, it's not a great room and that crossover helps me achieve the target and crossover frequency I'm using).
...

You can get a LR4 filter (either low-pass or high-pass) by connecting two 2nd order Butterworth filters in series. 2nd order Butterworth filters have Q = sqrt(1/2) = 0.7071.

[Edit] I wouldn't worry too much about using exact LR filters for subwoofer cross-overs. You'll need to EQ later based on room measurements.

 

[mrlawng9]

Thanks for the info - much appreciated. It was a crucial piece of the puzzle. So was being in the right tab of the spreadsheet. Turns out I was getting all turned around because I was in the Linkwitz Transform tab not the correct crossover tab.