How to optimize sub integration with 2 channel?


I’m at the point of wanting to integrate a proper sub into my 2 channel system.

Hey folks,
I understand that I can control the gain and frequency of the low end of the sub,via the sub.

But is there a way to do the inverse? Can I reduce the low end of the speakers to about 45 hz and use
the sub instead from about 44 hz and below?

If possible, how would that work? e.g., use an external crossover for the floor standers?
The problem is that there is too much output at around 3-50 hz if I use both the speakers and the sub.

thanks!! Gary

Rig: (Bel Canto DAC–> PrimaLuna Dialogue HP tubed integrated–>
Dali Helicon 400 floor standers, Spatial M3 Triode Masters, and coming soon Dynaudio S3.4 Contours (thanks Joe)
128x1281graber2
Just discovered that the Swarm system also includes the possibility of high passing the main speakers.
@1graber2
The PrimaLuna has a mono out that is used for the sub. I’m not sure if it is the best solution, but I Currently use a single RCA cable to run from the Mono out of the PrimaLuna to the LFE in my current sub (a 10 year old Martin Logan Grotto, 10", 200-250 watts or so).

Also, the PrimaLuna does have an HT Bypass that only uses the Amp section of the PrimaLuna. Is that what you mean?
If you want to high passing the main speakers, you need a subwoofer with speaker level high pass filter like this one:
http://www.apexjr.com/images/MK1250amp.jpg

If you want to apply line level high pass filter via HT Bypass, you need a separate preamp to do that.
Since you already have a sub, I would suggest getting a DSpeaker Antimode 8033 first, for room equalization. You will be pleasantly surprised by the improvement. See here for a review: http://www.theabsolutesound.com/articles/dspeaker-anti-mode-8033-dsp-subwoofer-equalizer-tas-204/
I am not quite sure about the kind of connections you have, but if you have a line level output from your amplifier, that should work just fine. Get the 8033 Cinema in that case.