I recently purchased the NXG NX-HTDJ from an amazon seller for just over $15. (I am new to head-fi so forgive me if this post is improperly located.) I needed a cheap set of cans to open up and play with. I am a new father so I am on a budget, but want to explore more impressive options in the future and gain a little practice without sweating over $$$. $15 allows for less pressure to get acquainted with modding. I discovered that the NX-HTDJ was supposedly a rebrand of the popular 8323, but slightly more comfortable with the velour headband. I can’t say if the two cans share the same sound signature, but the NX-HTDJ sounds great for the price. What can you really expect for $15.
The fit is a different story. I have a normal sized head, in my opinion, but felt like I was stringing a bow-and-arrow when putting the cans on. A strange squarish shape ensued. I understood this as a common criticism of both the 8323 and NX-HTDJ. The fit wasn’t too tight, but I felt like there was one small contact point on the top of my head allowed by the recurve design. After looking at the headband, I decided to get out my screwdriver and take things apart.
The swivel angle of the gimbels (?) was limited by the headband. I decided to remove a small amount of material from the headband to allow for a wider angle. I hoped this would get rid of the strange look of the headband and it did! In fact, it allowed for a more ergonomic curve to the headband and has greatly improved in the overall comfort of the headband as the pressure is spread across a wider surface area.
I am not one to frequently post on forums (this is my first), but I feel this mod so greatly improved my appreciation of these headphones it was worth passing on. Below, I have a few shots of the mod.
1. I eyeballed the general angle I wanted to achieve. Obviously, removing too much material could result in insufficient clamping force.
2. To disconnect the cup and mounting brackets, remove the two screws and gently pry the bracket back. The ball joint should easily slide out of the mount without completely removing the bract.
2. I ended up removing about 2mm with a diamond file. I am sure a Dremel tool would be wonderfully expeditious for the removal process. I would recommend covering the wire with tape to prevent inadvertently removing material from the wire jacket. I also removed the inward facing stopper protruding from the top of the ball joint. It seemed to restrict the movement for the angle I was looking to achieve. Both areas I removed are visible in this photo.
4. Like I said, the fit is greatly fit is greatly improved and consequently the comfort. I also noticed little reduction in clamping force. Don’t be fooled by the mundane facial expression, they are considerably more comfortable.
I also punched holes in the rear facing vent covers and placed a discernible amount of polyfill inside the cups. I hoped the polyfill would tighten up the bass and reduce the slight flabbiness. Opening the vents freed up the bass a bit, counteracting any loss from the polyfill. Now the bass seems much more musically varied. Lastly, I lined the inside of the cups with coaches tape. That's right, coaches tape. After reading that dynamat, which I do not have access to, reduced the soundstage making the sound more canned in, I still wanted to have some damping for the top end to reduce the subtle graininess without reducing soundstage. Not sure if this had a major effect, but over all the cans sound great.
I was considering a headband pad mod, but I think the comfort has been improved to the point that a new pad is unnecessary.