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

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. 

My humble opinion is quite different.  I have a 6-band equalizer between my CD/SACD player and my integrated amp and use when I play certain discs and its wonderful!

For example, nearly all (all?) early Motown recordings have very little low end and a bit too much high end.  A judicious use of the equalizer makes Tham sound amazing!

So in my opinion/experience, the issue is the recording.  I know of no other way to address this. Do you, @soix ??

With a tape/processor loop.

it seems you might want to get an amp with better connectivity options.

Or perhaps a cheaper alternative would be to get a preamp with a tape loop and insert that between your sources and your amp.

So in my opinion/experience, the issue is the recording.  I know of no other way to address this. Do you,

@rpeluso  Yeah, this is definitely a case of different strokes for different folks and I don’t think either of us is wrong — we just handle it the way that works best for us.  For me, I don’t want to insert any extra cables and equipment into my system if not absolutely necessary.  I only listen to well-recorded music on my main system and I don’t want anything to potentially degrade the sound of those recordings on my system, and I find it hard to believe inserting an equalizer and another pair of interconnects onto the signal path doesn’t have at least some negative effect.  If I listen to less well-recorded material I’ll listen to it on a Bluetooth speaker or something similar, but there’s so much excellent well-recorded and new music via Qobuz out there I really never feel the need to listen to poorly recorded music.  One example — I’m a huge Steely Dan fan but especially their earlier stuff is not well recorded (at least digitally) so if I get the urge I’ll enjoy them on my Bluetooth speaker (Audio Engine B2) and enjoy it just fine.  Anyway, that’s what works for me and glad you’ve found a great solution that works well for you, and the world keeps spinning.