Reddit mentions of Monoprice Dual 31-Band Graphic Equalizer with Subwoofer Output

Hmm seems like it's simple at first but in the end it's not. It's essentially up to whoever wrote the driver for your soundcard whether or not they provide an equalizer. Some do but most do not. Those that do you need to make sure it works for the Windows Driver and not just the ASIO drive. For example my TASCAM US-322 has an EQ for the ASIO driver but not for the Windows driver. On the other hand my Realtek has a software EQ for the Windows Driver but no ASIO driver at all.

So in my case if I wanted to use it for all general Windows audio I'd need to use my Realtek soundcard and the advanced software control panel to use the EQ.

Your other choice ofc. as other have mentioned is to buy a hardware Equalizer: http://smile.amazon.com/Monoprice-31-Band-Graphic-Equalizer-Subwoofer/dp/B00KLRP5CK/

I actually have that exact speaker! I put it in a DIY MDF box that measures out to a total internal volume of 3.5 cubic feet. I got a good deal on a used QSC ISA280 for $100, so that runs through this guy;

https://www.amazon.com/Monoprice-31-Band-Graphic-Equalizer-Subwoofer/dp/B00KLRP5CK

But, since this was a small purchase at a time, I should have just bit the bullet and gone with this instead;

https://www.amazon.com/Behringer-NU3000DSP-BEHRINGER-iNUKE/dp/B005EHINAS/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1540510237&sr=1-1&keywords=inuke+3000dsp

It's a very powerful combo, but I only use it for music so I made the enclosure sealed as opposed to ported. This means it's doesn't play down into the low 20hz range, but almost all music doesn't go that low anyway. You could easily build or buy a ported enclosre and use the DSP on the Inuke to boost the bottom end.

I've been super happy with it as a driver, and am considering getting 2 of the 10" as bass drivers for a pair of DIY semi-open baffle full range towers I'm thinking of building.

Great sub, you will not be unhappy with it! I got mine because the goddamn Ultimax 18" is constantly on backorder. I've also surprisingly heard good things about some of the Rockville car subs, but ultimately went with the Skar.

Good luck, and I hope you get what you are looking for!

Older image of my in progress setup;

https://imgur.com/a/Ct1kKdz

And, while not the greatest box in the world, this could save you a lot of time and effort if you decide to go ported and not DIY it;

https://www.amazon.com/Single-Subwoofer-Universal-Speaker-Enclosure/dp/B00IFEG6YW/ref=sr_1_3?ie=UTF8&qid=1540510954&sr=8-3&keywords=18%22+sub+box