Rhythmic F12SE setup using line in


I recently purchased a preamp which has no bass management. I had been using my Marantz 7015 LFE and Audyssey MultEQ-X with a +3db/-3db tilt curve & crossover at 80Hz with my KEF R11’s & Rythmic F12SE. The bass was clear, concise & crisp. 
 

I have followed the Rythmic instructions on line setup and cannot quite get the same results. Bass is less crisp, almost muddy.
 

I currently have the crossover at 50Hz, gain at 0, bandwidth & freq middle, delay/phase 10:00 (rhythmic recommendation for ported mains), volume about 1:00, nonLFE low pass 50Hz/24, rumble off, extension filter 14 hi. 
 

Any recommendations? Thanks 

128x128signaforce

@audiorusty 

Interesting recommendation. The KEF’s do come with plugs for the rear ports. I will give that a try, while reducing the crossover. Had a similar recommendation from @soix Thanks!

I would suggest doing one thing at a time.  Sometimes adding port plugs can change the sound characteristics of the speakers, so I’d definitely try that last after everything else is dialed in. 

Out of curiosity are you experiencing any differences when making a change to the settings?

I have two Rythmiks of this make. I have done a lot of work to dial in my subs (I have a third REL). Ultimately, the best thing to do was buy a mini DSP and integrate subs that way. Highly recommended.

https://www.minidsp.com/applications/digital-crossovers/194-subwoofer-integration-with-minidsp

I would prefer to dial in my sub without the use of the minidsp. They appear to work via ADC then back to DAC to do the sound processing, something I avoided  (NAD, Anthem, Lyngdorf etc) when purchasing my preamp. Help me if I am wrong. If I was to go that route, it looks like the minDSP FLEX is the one I should choose. Thanks!