Large speakers plus EQ, what have you done?

My crude method is an API parametric  equalizer.Starting with the Amroc room mode calculator to see where the problem frequencies in the bass are I adjusted the frequencies by ear and left it alone. If I were to someday purchase longer cables I would have it next to me and fiddle with it to fine tune sometimes.But I'm happy enough with the sound now that it's not important.

Have Audio Refinement (YBA) separates and speakers:

• AR Pre 5 analog preamp running in stereo mode only
• AR Multi 5 amp using front 2 channels only (stereo mode)
• ProAc Studio 148, grills off, on Soundocity SEV9 outriggers

Speakers can get a little bass heavy (they easily go down to 25Hz) plus have an upward treble tilt in my room. Added a Schitt Loki Mini+ 4 band equalizer between the preamp and amp. It had the ranges I desired for modification, is very quiet (and runs a little warm), got it used in excellent condition for a great price and is black like the rest of my system.

Overall, I am very happy with the new addition and results. I would recommend getting one.

My AR 9 speakers and Technics SH-8020  eq works for me

Not too long ago in my living room I had a pair of Polk R700's for streaming & stereo TV. I have a decent null at 50hz & a huge boost/peek at 42.

Initially I was using an Arcam SA30 with its Dirac & SVS subs & their PEQ App. The Arcam crapped out on me & then I tried a MiniDsp DDRC-22D. The minidsp is basically a 2 channel dirac box. Multiple digital inputs & digital outputs only..so you can use your favorite dac. I upgraded the power supply & ditched the subs. I had a hard time incorporating the subs & mains with the 2ch dirac minidsp. 

The Minidsp/Dirac worked well for bass. Eventually though I didn't like what it was doing to the mid & high frequency. I wasn't well versed in Dirac & apparently I shouldn't have been trying to correct anything over 2 to 300hz. But I had a peak around 1khz I was trying to tame as well. This was my living room...no acoustic treatment. The DSP device worked well with the bass though. Lots of time measuring & remeasuring. 

After I grew tired with the Minidsp I hooked a RME ADI-2 Dac to the TV/Streamer. I used a Super Farad 3 power supply I had with the dac & hooked the Dac straight to amp (class D Hypex Nilai). I love that little Dac. Great volume control & cool loudness function that adjust with volume. Best thing though is that it has 5 PEQ tabs..and 2 extra but  limited PEQ tabs you can set up for a Bass & Treble tone control. You can also set the PEQ for each channel individually. 

With a Umik & REW software I could measure the room & see my issues. The Dac had just enough PEQ tabs to dial in my bass & any issue in the higher frequency. Plus it sounded more natural than using Dirac to my ears...at least in the upper frequencies. I'm back to bookshelves now in that room but was very happy with how a little PEQ helped my overall bass response. Obvious issues is that it only worked for digital sources. It's also a dac that not everyone will appreciate as much as I did. 

My system is vintage. The bass has been ok, very good with some songs and lacking with others. Have been looking for a vintage EQ, while also thinking about getting the Loki Max. 

After reading stuff all over the web, everyone said recap the crossovers. Did that, and the bass was a magnitude better, deeper, fuller, faster. So was the mid and high end. It really woke up the speakers. 

After living with that for a bit, and still wanting more...

Did a full recap/refresh on my pre-amp. Another order of magnitude better, everywhere! Turned my treble from +4 to 0, and bass from +6 to +3. Everything was so much cleaner, clearer, most of all the lowered noise floor. 

That lasted about 2 weeks...

Did a full recap/referb on my amp, same as above, just less so. But mostly lowered the noise floor, feel like I got another 50w out of the amp. 

Just this week, wanting more low bass, want to feel it in my chair! Decided to move the speakers around the room. Spent about 3 hours measuring, taping, moving listening... 

Found the sweet spot, might have been almost sitting in the null. Now I have powerful bass that I can feel, soundstage is much better, channel separation is better, tone controls are almost no longer in use. Bass is 0 - +3 depending on source and volume. 

Will see how long this last, but still thinking about adding a sub, and/or a EQ. If something pops up used that looks like fun it will be added. But in the end of all this, my entire systems sounds 100% better, total cost was not much, but a ton of sweat equity.