Subwoofer active line level input?

SivaNevets

I have recently upgraded my HT subwoofer to a servo martinlogan iGrotto, now I have a spare Martinlogan dynamo 300 for my computer 2 channel setup (which is surprisingly musical), to compensate the polk LSI7 in the lower end.

My integrate amp NAD C316BEE does not have LFE, after some research I find out it is possible to use active line level input on my subwoofer. So basically one pair of speaker wire hooked into the LSI7 and the other pair hooked into the subwoofer.

It sounded pretty good.

Here is my question:

The LSI7 is probably getting the full signal, means the bass in being reproduced twice?

The high end companies like REL actually recommends using active line level input instead of LFE, for getting the excat same signal, how do they deal the problem I described above?

Thanks!

ken brydson

I'm no expert on this but I think the way it's supposed to be done is both channels to the line level inputs on the sub and then from the outputs of the sub to the speakers.

SivaNevets

Hi Ken. The sub I have is entry level, do not have speaker level outputs.

ken brydson

But it has line level inputs? Odd...

SivaNevets

I think its quiet common, even on the more expensive ones..
DYNAMO 300

Grotto-I

ken brydson

Hmmm, above my pay grade. You'll have to wait for someone else to chime in.

rpf65

when you connect the speakers to the speaker line in binding posts, it activates the low pass filter. This allows you to adjust the cross over freq to the mains.

Martin Logan says to connect both speakers to the line in binding posts, not just one. Assuming this is the way you are connecting it.

SivaNevets

Thanks rpf65... so the low pass filter from subwoofer filters the signal to the speakers as well?

Yes... I am connecting both speakers to the line in binding posts. They do synergize and sound really well though.. the Dynamo 300 is an amazing little musical sub..