Don't get an MM-500 for just music enjoyment. They're designed for mixing and mastering, with no colorization of the sound. It's designed to be flat, a magnifying glass only of what was recorded.

You say you record and mix music, so the MM-500 could be good for that purpose. but I think you would be better off buying a good $300 mixing headphone for your composition work and then a quality $1,500 headphone for musical enjoyment. Goldilocks doesn't really exist in audiophile headphones.

While that sounds pure and honest on the surface, most of us want some sort of sugar or spice added to our frequency curves. Pure can be beautiful; it also can be boring or expose recording warts you don't want to hear.

First, Abyss makes overrated, overpriced products. It would be one thing if one site or reviewer questioned their wonky measurements and distortion, but too many do to ignore it.

Second, you're taking a MASSIVE leap from a pair of $300 Momentums to a $3,000 pair of headphones. Way too big, to be frank.

Start smaller. It's cheaper, and it's a better way to discover what you really want.

There is no instant gratification, Goldilocks headphone unless you truly know what you want and have done the research to indicate the headphone matches that preference. You didn't, and that's OK, but you never would have bought the Diana TC if you did. Plus, the Diana TC are VERY hard to drive, so I bet your amp lacks the power to elicit peak fidelity and enough volume.

It sounds like you want more of a V-shaped, aggressive sound signature with more bass. I recommend these cans in the $500-$1,200 price range:

Meze 109 Pro (Rich bass, bright treble. Very comfortable and well built.)

Focal Clear (Original, not MG)

Focal Elex (Punchy, aggressive, detailed)

Audeze LCD-2C (Warm, rich bass, aggressive midrange that puts vocals front and center, rolled-off, less-detailed treble. Needs EQ to sound its best.)

Audeze LCD-X (My daily driver. Better, more balanced tuning than the LCD-2C, but still nice bass. Excellent detail throughout. Needs EQ to sound its best.)

Sorry if my words above come off harsh. But you did the headphone equivalent of jumping from a passenger car to a Formula One car with no in-between steps. That method is more likely to end in disappointment.

Feel free to ask ANY questions, dude. Good luck with your audiophile journey.

I’m slow on the reading uptake. 😂

I've owned HiFiMan Edition XS and HE-400se. Definitely the best I've heard in their respective price categories. Mine lasted, too!

But I have moved on to Audeze LCD-X 2021, and I'll probably never part with my trusty, venerable HD 6XX.

I take it you've never owned a HiFiMan headphone. They are notorious for quality control and build issues, even if you handle them with white gloves like the Crown Jewels.

Just because you've never had a headphone break doesn't mean that everyone who gets a bum unit from HiFiMan treats their gear like shit.

HiFiMan and Focal are neck and neck in the shitty quality control derby among audiophile headphone brands.

Nope. Not that simple.

There's acoustic dampening and other trickery in the cups that differ in open-back and closed-back models. Even if you somehow added closed-back cups to the LCD-2C, they would sound like shit because they're tuned to be an open-back.

Wooden cups

Famous last words. :)

But the entire HD 600 series is comprised of damn fine headphones. Enjoy.

Try "thank you."

It's the thought that counts, dude. Not every kid has a dad who is around or gives a shit about him or her.

The bass is far too low on that FR curve for it to be a real Raycon. The bass curve on Raycon's reaches the stratosphere.

Don't worry: The lead will kill you only if it leaks into your ears while in the state of California.