Subwoofer hook up


Perhaps a dumb question, but here goes. I'm getting a pair of small Magnepan that will no doubt benefit from a sub. I'm using a NAD C372 integrated that does not have a dedicated sub out jack (it does have pre amp outs). So what I'm wondering is: if I use the high level inputs on the sub (Athena AS 400)...where I run speaker wire from the amp to the sub, then from the sub to the speakers....will the adjustable crossover in the sub filter the signal going to the Maggies? In other words...if I set the xover at 80hz, will that prevent the Maggies from seeing lower frequencies? Thanks for the thoughts.
secretguy
You can run them full range, just use the pre-amp out to your sub inputs. I think this will work, Try to experment with cross over and volume control too.
>07-10-12: Ryriken
>You can run them full range, just use the pre-amp out to your sub inputs. I think this will work, Try to experment with cross over and volume control too.

You generally don't want to run speakers full-range with the sub since that does nothing to reduce

1. The IM midrange distortion and perhaps ultimately damage inducing excursion which is quadrupling with each octave lower in sealed enclosures until they start rolling off, becoming what it would be without the enclosure in ported ones, and octupling in dipoles.

2. The SBIR notch on non-dipoles where bass reflections off the front wall are 180 degrees out of phase

The exception is sealed enclosures with a high-enough resonance (120Hz is a good idea for 6" mid-woofers) that they're not going to approach their linear limits without high Q which causes a pass-band bump to simulate the bass they're missing when run without .
Drew, this is what i do with my Merlin TSMXe speakers, per Bobby at Merlin.
He told me to run them full range and crossover at 45hz.I also use a sealed boxed subwoofer, like the Merlins which are also sealed.
Thanks, but no one has answered the question. WILL the xover setting on the sub filter the low frequencies going to the Maggies IF I wire them as described?
I just read the manual online and it certainly isn't clear about how the circuit works but it looks like the answer is no,it will pass the fullrange signal. The only real way to know for sure is to hook it up and see for yourself. I personally wouldn't pass the signal through the sub anyway,I prefer a direct connection for my speakers. I use speaker cables with spade ends for my speakers and put speaker cables with banana ends on the same posts on the amp to run to my sub. I then tuned my sub to blend nicely near the bottom of my speakers range and it all sounds great.
07-10-12: Secretguy
>Thanks, but no one has answered the question. WILL the xover setting on the sub filter the low frequencies going to the Maggies IF I wire them as described?

Some and probably not how you want.

The speaker level filters are not variable (that'd be too expensive), are first order which would allow dipole excursion to still quadruple with each lower octave, try for a high frequency (like 120Hz) to protect small satellites, and do nothing to compensate for speaker impedance.

I'd buy a home theater receiver and use that if I were you.

A more audiophile approved solution would be a separate power amp and outboard sub-woofer cross-over.
Thanks Drew.
As it turns out, it doesn't matter anyway. After setting up the Maggies, there is more than enough wonderful, musical bass. As a previous Maggie owner, I should have known this, but feared that the smaller MG12 would be deficient. It isn't!! So...no sub for 2 channel!