None, I use a Sound Bar.
But did test with Bounty Hunter HEAD-PL Metal Detector Headphones and another cheap pair sounded fine on both

 
Corsair. They sound pretty good.

Using Beyerdynamics MMX300 Gen. 1

sony wh-1000xm3. Man oh man, does this card do the trick. also have a sennheiser gaming headset as well, sounds good on that one as well. really enhances everything. 

LordGTXTitan
Using Beyerdynamics MMX300 Gen. 1

How do these sound listening to music?

Tried mine with HD650s, K712pro, DT770 250ohm and Mad Dog 3.2s (Fostex t50rp) and it's had no difficulties driving any of them. :)

Talon5
I’m thinking of possibly purchasing this in the next few weeks to replace my ancient Titanium HD and also get a new headset and I’m curious to see what everyone has used with this new sound card and how it performed. What ohm rating, what microphone you use for those without one attached, etc. I currently have an old Turtle Beach gaming headset and have my eye on the Beyerdynamic DT900 Premium 600 ohm and saw that EVGATech_LeeM said he uses these as well. Thanks in advance for all your helpful input.

I use the Beyerdynamic T1 2nd gen audiophile headphones and let me tell you.  With all application audio forced at 100%, I have to keep the OS audio at 30 or below, or I risk losing all my hearing!  The drive of this card is legit.  Eliminates the need for my Beyerdynamic A20 headphone amplifier for my main gaming PC.
 

 
 
 
 

Sennheiser 660s (150ohm)
Sennheiser 58x Jubilee Massdrop (150ohm)
Sennheiser PC310
 

EvoLunatic
Fostex Ebony 25 ohm and 94 dB sensitivity.

I've been looking at those lately, but I'm trying to hold off and save up for something a bit on the higher-end, though.

EvoLunatic

EVGATech_LeeM

EvoLunatic
Fostex Ebony 25 ohm and 94 dB sensitivity.

I've been looking at those lately, but I'm trying to hold off and save up for something a bit on the higher-end, though.

It's just an excellent performer for the price. I'm eying a Focal Stellia for a future purchase. Waiting on some detailed reviews on it to pass the time. You might want to check it out.

I have some Elear's, so I'm already partial to the Focal sound, for sure.  I'm probably looking for something with a wider soundstage for gaming, however, which probably omits most closed-backs, unfortunately.  On the other hand, I should probably get a good pair of closed-backs at some point. *sigh*.  This is a rough hobby.

I ended up finding a good deal on the Beyerdynamic MMX 300 Gen 2 so I went with those as I preferred to have a headset built in mic vs attaching another like the modmic (another cable hanging down) or an on desk mic (another object on my desk). I did notice, as I saw a mention in an online review about burning them in, that they sounded better after letting them play for 4 hours while I did family/house stuff when I got them. Even more so on day 2 when I did the same. In all, they sound great. I`ve heard sounds and instruments that I never heard before on my Turtle Beach Z22. The soundstage is so much better. Pretty comfortable too. The clamp is just right for me (not too hard or too soft) and the build is high quality. Overall, a little expensive but worth it.
 

Audio Technica ATH-AG1X I'm using a Schitt Magni that I use for an amp since I've grown used to using it as my volume knob since I had the ATH-AG1 until the ear cup yokes broke and I was not going to deal with replacing them on my own again. My biggest complaint with the Nu Audio card is the mic gain is really high for this microphone which I have an additional 6 foot extension on to match the length of the cable going to the Magni. The improvement from my Soundblaster Z was mind blowing, I wasn't expecting it to improve so much. 

Sennheiser HD 650, 580
AKG K702
Oppo PM3
 

I'm using a set of Shure SE846 IEMs (9-16ohm)...they're so easy to drive I use an inline attenuator to make sure I don't blow out my eardrums if I accidentally turn the volume way up.

Sometimes I put ear protection earmuffs on over my IEMs for maximum immersion, the only issue being that I can hear almost literally nothing of the outside world. The isolation is -intense-.

The combination of high quality IEM and near top of the line sound card makes music, movies, and games sound great. Unfortunately, it also makes it painfully obvious when you're listening to a poor quality rip or recording.

cliffgoat

Talon5
I’m thinking of possibly purchasing this in the next few weeks to replace my ancient Titanium HD and also get a new headset and I’m curious to see what everyone has used with this new sound card and how it performed. What ohm rating, what microphone you use for those without one attached, etc. I currently have an old Turtle Beach gaming headset and have my eye on the Beyerdynamic DT900 Premium 600 ohm and saw that EVGATech_LeeM said he uses these as well. Thanks in advance for all your helpful input.

I use the Beyerdynamic T1 2nd gen audiophile headphones and let me tell you.  With all application audio forced at 100%, I have to keep the OS audio at 30 or below, or I risk losing all my hearing!  The drive of this card is legit.  Eliminates the need for my Beyerdynamic A20 headphone amplifier for my main gaming PC.
 
 
 
 
 
 

I have the same setup. I haven't used my A-20 for some time now. But the T1 2nd Gen sounds great on the Nu-Audio. My old DT-880 Pro do not sound bad either.