Connection advice with new subwoofer in stereo system

[crapula2010]

Not sure how best to connect my stereo system with subwoofer.

Equipment
Eversolo dmp8 streamer and dac
Topping a90d headphones/pre amp
Two topping la90d
Svs 3000 micro subwoofer
Concept 40 floor standers

I use the eversolo as a room endpoint and also feed hdmi earc from the TV

The eversolo has both XLR and RCA output and both can be on or one or the other can be on.

The a90d has both RCA and XLR inputs and outputs and headphone output can also be balanced or unbalanced.

The subwoofer has RCA in and out but no speaker level in.

The a90ds have balanced inputs too.

Before I got the subwoofer I had

Eversolo->xlr->a90d->xlr->la90d->speakers
Now I've got

Eversolo->xlr->la90d>speaker
Eversolo->rca->sub->rca->a90d->headphones when I want it

Problem is I have to turn the gain down on the sub to use the headphones which is ok but.

Another way would be to have my original setup but just have RCA from either the eversolo or the a90d to the subwoofer again this has the same issue when using headphones.

 

[Al ears]

Why is it necessary to integrate a subwoofer?

 

[crapula2010]

"
Why is it necessary to integrate a subwoofer?"

Er...because I want to. I'm not sure what your answer has to do with the price of fish though?


To help though the concept 40s roll off -6db at 53 Hz so movies and bass heavy music does sound quite a lot better with it in the system.