Audio-Technica ATH-M50xSTS XLR StreamSet Streaming vs Beyerdynamic MMX 300 Pro

Sound Quality

The Audio-Technica ATH-M50xSTS XLR StreamSet Streaming uses a 45 mm large-aperture driver with rare earth magnets and copper clad aluminum wire voice coils. The listing says this provides the familiar ATH-M50x style tuning with deep bass and clear highs. The Beyerdynamic MMX 300 Pro also uses a 45 mm dynamic driver, specifically the STELLAR.45, tuned for gaming. Its listing does not publish frequency response data, so direct sonic measurements are not available.

The ATH-M50xSTS receives a sound quality score of 26 out of 30, one point higher than the MMX 300 Pro at 25. That slight edge likely comes from the M50x heritage, which is known for strong bass and sparkly highs that suit voice over and streaming. The MMX 300 Pro is positioned as a gaming headset with a broadcast-grade condenser microphone, and its tuning may prioritize spatial cues over pure music enjoyment. Both are wired, so neither suffers from wireless compression or latency.

Comfort and Fit

Neither listing publishes the headset weight or earpad material, which makes a direct comfort comparison difficult. The Beyerdynamic MMX 300 Pro scores 17 out of 20 for comfort and fit, while the Audio-Technica ATH-M50xSTS XLR StreamSet scores 16 out of 20. The one point difference is modest and likely reflects Beyerdynamic's general reputation for comfortable over-ear designs, even though this specific listing does not provide weight or pad details.

The ATH-M50xSTS has a flexible boom arm, which adds some weight and structure on one side of the headset. The listing does not specify weight or clamp force, so the effect on long-term comfort is unknown. The MMX 300 Pro has no such boom arm adjustability listed, but its closed-back design is common for gaming headsets and may provide a snugger fit that blocks outside noise.

The missing weight and earpad information on both products means buyers cannot judge comfort from the listing alone. If you have experience with the original ATH-M50x, the StreamSet may feel similar, but the Streaming version adds a microphone boom that changes the balance. The MMX 300 Pro is handmade in Germany according to the listing, which could imply higher build consistency and comfort, but again this is not measured.

Noise Control and Features

The Audio-Technica ATH-M50xSTS XLR StreamSet has no active noise cancelling and the listing does not specify any passive noise isolation rating. The Beyerdynamic MMX 300 Pro also has no active noise cancelling, but its listing explicitly states passive noise isolation only through its closed-back design. This gives the MMX 300 Pro a slight advantage in blocking room noise during gaming or streaming, assuming the closed-back design works as described.

In terms of features, the ATH-M50xSTS is centered on its cardioid condenser microphone based on the 20 Series and a flexible boom arm. Those features are directly aimed at streamers, podcasters, and voice over artists who need consistent speech capture. The MMX 300 Pro lists a broadcast-grade condenser microphone but does not describe a flexible boom arm; instead it is a gaming headset with a fixed boom microphone that is not detachable.

Battery, Bluetooth and Connectivity

Both headsets are fully wired and have no battery, so battery life is not applicable for either model. The Audio-Technica ATH-M50xSTS XLR StreamSet uses an XLR connection only, which requires an XLR audio interface, mixer, or similar device. The Beyerdynamic MMX 300 Pro uses a 3.5mm detachable cable and works with PC, PlayStation, Switch, and any device with a 3.5mm headset jack.

The connectivity score in the listing gives the MMX 300 Pro a 14 out of 15, while the ATH-M50xSTS receives 12 out of 15. That two point gap reflects the MMX 300 Pro's plug and play nature across multiple consumer devices. The ATH-M50xSTS avoids wireless latency and compression by using XLR, which is an advantage for live monitoring, but if you do not already own an XLR interface, you will need to purchase one, which adds cost and complexity.

The ATH-M50xSTS's XLR connection also means the condenser microphone likely needs phantom power, though the listing does not state this explicitly. The MMX 300 Pro's condenser microphone is powered through the 3.5mm jack by the connected device, but it may also require additional power that is not listed. Because neither product has a battery, there is no charging time, no battery degradation, and no risk of running out of power mid-session.

Build, Design and Portability

The Beyerdynamic MMX 300 Pro lists handmade in Germany as a key build point, which suggests a level of manufacturing care and quality control. The Audio-Technica ATH-M50xSTS XLR StreamSet does not have a similar handmade claim, but it is based on the ATH-M50x platform, which has a known durable design. Both headsets are over-ear and wired, so they are not particularly portable in the way true wireless earbuds are.

The ATH-M50xSTS includes a flexible boom arm, which adds a moving part that could be a durability concern over time, though the listing does not say whether it is replaceable. The MMX 300 Pro's boom microphone is not detachable, which means if it breaks, the entire headset may need repair, but the listing also does not specify a warranty. Both products score 8 out of 10 for build and portability in the listing breakdown.

Call Quality and Daily Use

Call quality depends heavily on the microphone, and both headsets use condenser microphones. The Audio-Technica ATH-M50xSTS specifically lists a cardioid condenser microphone based on the 20 Series, which focuses on sound directly in front of the mic. The Beyerdynamic MMX 300 Pro lists a broadcast-grade condenser microphone as well, but does not specify the polar pattern.

The ATH-M50xSTS's flexible boom arm is listed as keeping the mic positioned for consistent speech, which reduces the chance of the mic drifting away from your mouth during a long session. The MMX 300 Pro also has a boom microphone, but it is not detachable and the listing does not mention adjustability. For daily use, the ATH-M50xSTS requires an XLR interface, so making a quick call on a smartphone or laptop is not possible without additional equipment.

The MMX 300 Pro uses a 3.5mm plug, so you can plug it directly into a PC, PlayStation, Switch, or even some phones with a headset jack, making it far more convenient for daily mixed use. The ATH-M50xSTS has no battery, which means you never need to charge it before a call, but you are tied to your audio interface. The MMX 300 Pro also has no battery and works as long as the 3.5mm device provides power to the condenser mic.

Who Should Buy It

The Audio-Technica ATH-M50xSTS XLR StreamSet Streaming is for live streamers, podcasters, and voice over artists who already own an XLR audio interface or mixer and want a single wired headset that delivers the ATH-M50x sound with a broadcast style cardioid condenser microphone. The flexible boom arm and XLR connection are designed for consistent vocal capture without wireless interference.

The Beyerdynamic MMX 300 Pro is for gamers who want a wired closed-back headset with a high quality condenser microphone and simple plug and play setup on PC, PlayStation, Switch, or any 3.5mm device. The 45mm STELLAR.45 driver is tuned for gaming, and the passive noise isolation from the closed-back design helps you focus on game audio without needing active noise cancelling.

The Deciding Question

The central question is whether you already own an XLR audio interface or plan to buy one. The Audio-Technica ATH-M50xSTS requires an XLR connection and likely phantom power for its condenser microphone, though phantom power is not stated in the listing. If you are a streamer or podcaster with a mixer or interface, this headset is a direct upgrade that matches your current signal chain.

The Beyerdynamic MMX 300 Pro solves that problem by using a standard 3.5mm jack that works with almost any device. It is a true plug and play gaming headset with a broadcast-grade condenser microphone, closed-back isolation, and zero latency. There is no software to install, no battery to manage, and no extra interface to buy.

In terms of microphone quality, both listings describe condenser microphones, but only the ATH-M50xSTS specifies a cardioid pattern. If you record in a noisy room, a cardioid pattern can help reject background sound, but the MMX 300 Pro's closed-back passive noise isolation mainly helps you hear your game audio. The deciding factor is your workspace: XLR studio desk versus multi-device gaming station.

Who Should Buy Which

If your primary activity is live streaming, podcasting, or voice over work on a desktop computer with an XLR interface, choose the Audio-Technica ATH-M50xSTS XLR StreamSet Streaming. Its M50x style tuning, deep bass, clear highs, and cardioid condenser microphone are built for that use case. The wired XLR connection eliminates wireless latency and compression, and the no battery design means it will not die mid-stream.

If you are a gamer who plays on PC, PlayStation, Switch, or any device with a 3.5mm headset jack and you want a simple wired headset with a high quality condenser microphone, choose the Beyerdynamic MMX 300 Pro. Its closed-back design provides passive noise isolation, the 45mm STELLAR.45 driver is tuned for gaming, and the handmade in Germany claim gives confidence in build quality.