First a little background:
I've had my NX-Otica MTM/dual sub combo for over three years now. I have driven them with a number of different DAC/preamp/amp combos and they have sounded exceptional with all of them. DACs have included an OPPO 105, Geek Pulse X-Infinity, and PS Audio Stellar Gaing Cell DAC (GCD). Preamps have included a DODD Audio tube buffer and the PS Audio Stellar GCD. Power amps have included a PrimaLuna Prologue 4 stereo amp, DODD Audio EL84 battery powerd stereo amp, and a PS Audio Stellar S300 stereo amplifier. The 'Oticas have sounded spectacular with all of this equipment as attested to by coverage of my rooms at the Lone Star Audio Fest.
In January I decided to take a step up and move from the PS Audio Stellar S300 Stereo amp to their Stellar M700 monoblocks. This resulted in a distinct improvement in sound quality. The improvement was large enough that when PS Audio offered a Beta test of their new hybrid Stellar M1200 monoblocks, I decided to get in on it. The results of that move are discussed in my thread "New Toy Time" https://www.audiocircle.com/index.php?topic=169079.0
An unintended consequence of being in the beta test and adding the M1200s to my system was that I then wanted to upgrade the DAC and preamp to be on par with the new power amps. So, over the past month I have replaced the Stellar Gain Cell DAC/preamp with a PS Audio DirectStream DAC Sr. with the Network Bridge II and a PS Audio BHK preamp. I have also swapped the stock tubes in the M1200s for NOS Mullard CV4003/12AU7s and the stock tubes in the BHK preamp with NOS Tungsram PCC88/7DJ8s. Also, due to nasty problems I have with DC offset and EM/RF interference in my power line, I have added a PS Audio Stellar P3 power plant to drive the front end gear (sources, DAC, and preamp). My system now consists of:
Windows Xeon based music server running Fidelizer Pro set to audiophile mode, ROON and JRiver 26,
PS Audio Stellar P3 power plant,
PI Audio Group Digi BUSS,
OPPO 105 universal disc player,
JWM Acoustics Karen 6 turntable with Ortophon 2M Black cart,
Lounge Audio LCR-MKIII Gold phono preamp,
Marantz SR7009 AVR,
PS Audio DirectStream DAC Sr with the Network Bridge II and Windom OS,
PS Audio BHK preamp,
PI Audio Group Uber BUSS,
PS Audio Stellar M1200 monoblocks,
GR-Research NX-Otica MTM/Dual OB sub combo, and a
GR-Research sealed sandbox sub for HT duties.
Now to the original question of how well do the NX-Otica MTM/sub combo scale when fed by better equipment. In a nutshell, phenomenally. Holy Smokes!!! Each step in this upgrade path has given me more of what I had before. Oh! My Word! How this system has transformed! Don’t get me wrong, it was exceptional before with the Stellar GCD and M700s but now, everything is so clear and detailed that instruments like cowbells, triangles, chimes (things that are usually obscured by the louder music) sound like you are standing next to them when they are struck. High, powerful, female vocals sung directly into the mic which still had a touch of harshness even with the GCD and M700s are smooth and clean.
I can’t really describe all the changes, especially the changes in feelings when listening. Where I used to kick back and relax to the music for a while, I find myself getting lost in classical and jazz while almost dancing in the seat with faster paced music and not wanting to stop listening for hours. Then I find myself thinking about when I can get back to the man cave for some more tunes. Especially before my wife goes to bed so I can turn it up.
The bottom line is, the NX-Otica MTMs (and by extension the NX-Oticas) sound fantastic with less expensive electronics, but the higher up the electronics food chain you go, the more the ‘Oticas reward you. While like Ron said, “the NX-Oticas are the best speakers you will never hear” [with any given level of equipment (my words here)], I doubt they will ever be the limiting factor in your system.
Whether it be baby bear (NX-Otica MTM/sub combo), momma bear (NX-Oticas / sub towers), or poppa bear (NX-Tremes / sub towers), the NX series OB speakers will continue to pleaase well into the future.