12 inch subwoofer overkill for desktop setup?

@soix pretty big, 1.8 m length table.

@noromance don't think I will delve into multiple subs. Too many cables. 

@big_greg @elliottbnewcombjr The Riga was bundled with Santorin 30-500 sub when it was launched a decade ago, the way Cabasse intended it to be listened. I'm using the smaller Santorin 21, my DAC is Lab12 Dac1 Reference and my amp is Sony TA-A1ES. I think my system is already pretty good and as nice as a few of the showroom setups I've been to, but hey, I will make small upgrade here and there whenever the fund allows.

The Rigas are satellite speakers and as such the sub has to take care of frequencies below 100hz. They are well, really excellent for listening to music, but also excel for home theater. Think of slightly livelier ATC SCM100 and you will get pretty good idea how the Rigas sound. The Santorin 30-500 comes with built in microphone and calibration kit for its DSP, so perhaps it should be much easier to integrate into smaller room?

@big_greg Honestly I am hard-pressed to think what to improve in my setup. My recent DAC purchase provided that final bit of upgrade that finally brought my setup to sound as equal as showroom setups costing easily 4-5X more. So from now on, I understand that any upgrade I make is probably only going to improve my setup marginally. I have not experimented with crossover, phase, and placement yet, but maybe I should. I followed Cabasse's recommendation in the manual to the letter on sub placement and crossover setting and they seemed to work well.