Have an integrated amp with only 1 subwoofer out...

If you are using one source component only ie a cd player you can install the equalizer between the source and the integrated.  Ideally, the integrated would have a tape loop in/out and the equalizer would be installed in the tape loop.  Then equalization would be available on all sources when the tape loop is engaged.

Thank you for the response.  

There is no tape loop in/out.  Just the inputs for the cd, aux, phono, etc.

Question.  If the equalizer has inputs for each component, can I plug the components into the equalizer first, and from the equalizer output, just run one set of RCA cables to one of the inputs on the amp?

First graphic is back of equalizer and second is back of amp.

Sorry.  Graphic did not come up, but I think you get the drift.

Equalizer inputs - dvd, audio, tuner, aux

Equalizer outputs - Rec Out - 2 left and 2 right

Amp inputs - Coax, Aux, Phono

Amp outputs - SW out

Bad idea an analog graphic eq will degrade clarity  digital eq is available through roon 

Why are you adding an equalizer?  That’s just a bandaid for something that is off in your system.  Better to identify the source of the issue and address that rather than inserting another piece of equipment into the signal path.  Look at any reviewer’s system or go to any high-end audio store or audio show and you won’t find an equalizer anywhere, and there’s a very good reason for that.  Do it the right way, not with bandaids.  Just my $0.02 FWIW.