Intro
Open-back headphones have one well-known weakness for the people who mix on them: the low end. You get the soundstage and the honest midrange, you give up some slam and sub weight. Most engineers keep a closed-back pair around for exactly that low-end check.
Audeze's pitch for the MM-520 is that you might not have to. The headphone is built on the MM-500, the open-back planar reference it co-developed with mix engineer Manny Marroquin, and it adds SLAM (Symmetric Linear Acoustic Modulator), a system that manages air pressure inside the cup to push deeper, firmer bass out of an open design.
That's the whole story here, and it's worth being honest about where it stands. Audeze announced the MM-520 on 3 June 2026 at High End Vienna. There are no hands-on reviews yet. What we can do is tell you what the predecessor actually earned in independent testing, what Audeze claims SLAM adds, and who should be paying attention before it ships in August.
Key Features & Benefits
- The MM-500 tuning as the starting point. The MM-520 keeps the 90mm planar magnetic driver with Ultra-Thin Uniforce diaphragms, Fazor phase management, and N50 Fluxor magnets. That's the platform reviewers praised on the MM-500 for its midrange honesty.
- SLAM for real low-end on an open-back. Audeze's Symmetric Linear Acoustic Modulator manages internal air pressure to deliver deeper, more controlled bass. This is the one thing the MM-520 has that the MM-500 doesn't, and it targets the exact weakness open-backs are known for.
- Easy to drive from whatever's on your desk. 18Ω impedance and 102dB/1mW sensitivity mean it runs cleanly off an interface, a console headphone out, or a laptop. No dedicated amp required to hit level.
- Reference-grade measurements. Frequency response 5Hz to 50kHz, THD under 0.1% at 100dB SPL, and a maximum SPL above 130dB. Headroom for tracking loud sources without the driver giving up.
- Magnetic memory-foam earpads. The pads attach magnetically, so swapping or cleaning them is a 2-second job. Long-session comfort was already an MM-500 strength; the MM-520 is heavier, more on that below.
- Pro cabling in the box. A braided dual mini-XLR to 6.3mm TRS cable, a 6.3mm to 3.5mm adapter, and a hard travel case. Studio-ready out of the box, no extra cable order.
Real Reactions
Here's the honest part. There are no MM-520 reviews to quote yet. So this section is two things, clearly labelled: what Audeze says about the new model, and what independent reviewers said about the MM-500 it's built on.
"The MM-520 represents the latest entry in our mission to provide creators and professionals with the ultimate monitoring tool. By adding SLAM™ technology to Manny's signature series, we've created a headphone that delivers even more truth in the low-end while maintaining the signature clarity Audeze is known for." Sankar Thiagasamudram, Audeze CEO (at launch)
"In general, I'm going to go out on a limb and say that the Audeze MM-500 is one of the best tuned Audeze headphones to date" Andrew Park, Headphones.com (on the MM-500)
"The MM-500 is going down as one of the most enjoyable headphone sound signatures for me this year." Marcus, Headfonics (on the MM-500)
Two things stand out. The MM-500's tuning is genuinely well-regarded, and that's the foundation the MM-520 inherits. The only real knock on open-back planars like it has always been low-end weight, which is precisely what Audeze says SLAM fixes. Whether it actually does is the question we'll answer when a unit lands on the bench in August.
How It Compares
| Audeze MM-520 | Audeze MM-500 | |
|---|---|---|
| Transducer | 90mm planar magnetic | 90mm planar magnetic |
| Low-end tech | SLAM (Symmetric Linear Acoustic Modulator) | None |
| Impedance | 18Ω | 18Ω |
| Sensitivity | 102dB/1mW | 100dB/1mW |
| Frequency response | 5Hz to 50kHz | 5Hz to 50kHz |
| THD | <0.1% @ 100dB SPL | <0.1% @ 100dB SPL |
| Max SPL | >130dB | Not published |
| Weight | 555g | 495g |
| Price | €2,199.00 | €2,099.00 |
| Availability | from August 2026 | in stock now |
MM-500 figures from its current Soundium listing; MM-520 from the product page and Audeze's launch specs. Data team to confirm final MM-520 specs against the production unit.
The decision is unusually clean, because it's the same headphone family. You're paying €100 more for SLAM and the newer tuning, and carrying 60g more on your head for it. The MM-500 is in stock today and reviewed; the MM-520 is the bet that the low-end upgrade is worth the wait and the weight.
Who It's For
- Engineers who mix on open-backs. If you love the soundstage of an open design but keep reaching for a closed pair to check the low end, this is aimed straight at you.
- MM-500 owners who want the newer tuning. If the MM-500 sound already works for you and you want more low-end authority, the MM-520 is the direct upgrade path.
- Producers running off an interface or laptop. 18Ω and 102dB mean you don't need a separate amp to get to level.
- Hi-fi listeners after a reference open-back. The same honesty that makes it a studio tool makes it a revealing listen at home.
Who should look elsewhere: if you need isolation, for tracking next to a live mic, for a shared room, or for the train, an open-back leaks by design and the MM-520 is no exception. A closed-back reference is the right tool there. And if you want to read an independent review before spending €2,199, wait for the units to ship and the first hands-on tests to land.
Pros & Cons
✅ Pros
- MM-500's well-reviewed planar tuning as the baseline
- SLAM targets the one real open-back weakness, low-end weight
- Easy to drive: 18Ω, 102dB/1mW, no amp required
- Reference measurements: 5Hz to 50kHz, THD under 0.1%, max SPL above 130dB
- Magnetic memory-foam pads, full pro cabling and hard case in the box
⚠️ Cons
- Open-back, so no isolation and it leaks (not for tracking or noisy rooms)
- 555g, 60g heavier than the MM-500
- €2,199.00, €100 more than the in-stock MM-500
- Ships August 2026, you can't audition it yet
- No independent hands-on reviews exist at launch
Where to Buy
The Audeze MM-520 is €2,199.00 at Soundium, shipping from August 2026.
Order the Audeze MM-520 from Soundium →
Free shipping over the standard threshold, 3 interest-free installments of about €733, secure checkout, and a 30-day money-back window if it isn't for you. Every unit ships with full manufacturer warranty through Soundium.
Final Thoughts
Pick by what you're optimising for. Need isolation, or want a reviewed product in your hands today? The MM-500 is here now and it's excellent. Want the MM-500's tuning with the low-end weight open-backs usually give up, and you're willing to wait until August to get it? The MM-520 is the one to watch. We'll have a proper verdict once we've run it.
Still Deciding?
Not sure whether to wait for the MM-520 or pick up the MM-500 today? Talk to the Soundium team and we'll help you choose for how you actually work.
