¡Obtenga asesoría en español!  Llámenos hoy a (800) 222-4701

Beyerdynamic MMX 300 Pro Closed-back Gaming Headset Certified Open Box , $322.99 - Add to Cart Skip to Product Information

Beyerdynamic MMX 300 Pro Closed-back Gaming Headset Certified Open Box

Gaming Headset with STELLAR.45 Drivers, Condenser Microphone, TRRS Connector, and PC Cable Adapter
Item ID: MMX300CProd1
Beyerdynamic MMX 300 Pro Closed-back Gaming Headset
Rebate Image
Limited-time Offer!
Save now!
Purchase this demo at Sweetwater and save while supplies last! The price shown reflects your savings.

Certified Open Box Savings!

Save $57 What is Certified Open Box?

The price below reflects your savings.

Savings: $57.00 New for $379.99
Ask An Expert Our Expertly trained Sales Engineers are ready to help! What is a Sales Engineer?
Beyerdynamic MMX 300 Pro Closed-back Gaming Headset Certified Open Box

Certified Open Box Savings!

Save $57 What is Certified Open Box?

The price below reflects your savings.

Savings: $57.00 New for $379.99

A Stellar Upgrade for Serious Gamers

This article was Written By

Our Product Research Team

Get to know them!

Expanding upon their beloved MMX gaming headset series, Beyerdynamic's MMX 300 Pro brings forth the very same communicative tech and comfort as before — albeit armed with a new and improved Stellar.45 driver design for utmost audio quality. Whether you're at a tournament or simply gaming at home, the Beyerdynamic MMX 300 Pro headset is made to deliver accurate sound while providing a comfortable fit — a necessity for long sessions. At Sweetwater, we appreciate the impressive 5Hz–40kHz frequency response as well as the closed-ear design that helps minimize outside noise and orient the headphones' speakers to your ears correctly. And your teammates will never miss a word given the MMX 300 Pro's high-quality condenser microphone that transmits voice loud and clear — even in noisy tournament situations. Developed with technology from the recording studio and private aviation industries, the MMX 300 Pro headset is built to perform reliably for years to come.

Studio-approved Stellar.45 sound

Beyerdynamic's game-changing Stellar.45 driver has received high praise from Sweetwater's staunchest in-house studio engineers. The system builds upon the company's Classic driver design with a longer voice coil and updated NdFeB magnet, providing efficient signal transfer with a lighter workload. So light, in fact, that the MMX 300 Pro headphones run on at an incredible 48 ohms. The result is signature Beyerdynamic output with minimal audio loss. From audiophiles to studio producers and everywhere in between, fans of Beyerdynamic's crisp, high-definition sound design will revel in the modernity these new drivers have in store.

Serious gaming headset

Combine the MMX 300 Pro's drivers with a high-quality condenser microphone, and you're set for whatever gaming situation comes your way. Even noisy rooms and tournaments are no match for the expert audio this microphone churns out. Developed with comfort in mind, Beyerdynamic attached silky-soft earpads of microfiber to ensure a comfortable fit even after long hours of gaming.

Beyerdynamic: quality you can count on

Sweetwater holds Beyerdynamic in high esteem due to the company’s unwavering commitment to excellence and innovation since its founding in 1924. A majority of Beyerdynamic’s products are designed and crafted at home in Germany to the highest engineering standards, using only the finest materials available. Whether taking the stage with a dynamic vocal mic, hitting the studio with a pair of the company's reference headphones, or leveling up your gaming experience with a top-tier headset, Beyerdynamic is dedicated to fueling your creative passion.

Beyerdynamic MMX 300 Pro Gaming Headset Features:

  • Closed studio-quality headphones with attached high-quality condenser mic
  • Cable remote for quick access to controls like volume, mute, and answering calls
  • Onboard Stellar.45 drivers boast Beyerdynamic's highest standard in audio design
  • 5Hz–40kHz frequency response
  • Silky-soft earpads make for comfort during long gaming sessions
  • Included PC Cable, pop filter, and 3.5mm adapter
What is Certified Open Box Gear?

At Sweetwater, we're so picky that what we call "Certified Open Box" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

Certified Open Box (also known as a demo) means we’ve had it out of the box for our YouTube channel, displayed at events, tested in our studio, or maybe it was in a customer’s hands for a few days and isn’t ‘factory fresh’ as a result. Every Certified Open Box item we sell has Sweetwater’s 2-year Total Confidence Coverage™ warranty and has been tested and verified up to ‘new’ specs by our factory-authorized technicians to make sure it’s in perfect working order before we ship it to you.

When you buy a Certified Open Box item at Sweetwater, you get:
  • 2-year Total Confidence Coverage Warranty™!
  • Products inspected and tested by our factory-authorized techs, guaranteed to function like new (or better)!
  • FREE shipping on most items
  • Equipment that will MEET or EXCEED your expectations!

Click HERE to browse our current inventory of Certified Open Box equipment. Purchasing Certified Open Box gear from Sweetwater is a smart and safe way to save!

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.