If you want a wider stated frequency range and lower impedance for meetings, choose SONY MDR-M1ST; if you need a traditional studio monitor with a standard stereo plug, choose Sony MDR-CD900ST. Both are wired, sealed over-ear headphones with 40 mm dynamic drivers, so neither is a wireless headset built around calls. My pick for most meeting setups is the MDR-M1ST, while the MDR-CD900ST makes more sense if its studio-monitor specifications and connector fit your gear.
• SONY MDR-M1ST: Its 5–80,000 Hz stated frequency response and 24-ohm impedance are its clearest spec advantages; the trade-off is that it is wired and has no noise control.
• Sony MDR-CD900ST: It offers a 5–30,000 Hz response, 63-ohm impedance, and a standard stereo plug; it is also wired, with no noise control.
• Both: Each has a sealed dynamic design, a 40 mm dome driver, and a cable listed at about 2.5 meters.
• Pick the MDR-M1ST if you want the lower-impedance option and broader published frequency range for a wired listening setup.
• Pick the MDR-CD900ST if you specifically want its studio-monitor format and standard stereo plug.
The MDR-M1ST is a wired, sealed dynamic headphone with a 40 mm dome driver. Its listed impedance is 24 ohms, and its stated frequency response runs from 5 to 80,000 Hz. Those figures make it the more compelling option on paper if you want a monitor headphone with a broad published range and an easier impedance match for a range of wired sources.
For meetings, the practical limitation is clear: the supplied specifications describe a headphone, not a complete headset. There is no listed microphone, Bluetooth connection, or noise-control feature. You would need a separate microphone or another call setup if your meetings require voice input. The 2.5-meter cable can suit a desk, but it is still a cable to manage.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-09 · 6 min read · Independent comparison
I’d choose the MDR-M1ST if listening detail and its lower impedance matter more than wireless convenience. Skip it if your priority is a self-contained calling device, or if you are shopping for Bluetooth headphones for meetings. The product information does not list Bluetooth or a built-in mic.
The MDR-CD900ST is also a sealed dynamic, over-ear headphone with a 40 mm dome driver. Its listed impedance is 63 ohms, sensitivity is 106 dB/mW, and frequency response is 5–30,000 Hz. It comes with a roughly 2.5-meter cable and a standard stereo plug, so the connector is an important point to check against the equipment you plan to use.
For a desk setup, this is a straightforward wired monitor option. Its stated frequency range is narrower than the MDR-M1ST’s, and its impedance is higher, but that does not by itself settle how either headphone will sound with your particular source. The published numbers are useful for comparison, not a substitute for listening or matching the headphone to your equipment.
For meetings, the same caveat applies: no microphone, wireless connection, or noise-control feature is listed. This is not a ready-to-use headset for calls. I’d consider it if you specifically want a wired studio-monitor headphone with a standard stereo plug; I’d skip it if your real need is a wireless headset or a microphone-equipped meeting solution.
• Lower listed impedance → SONY MDR-M1ST. Its 24-ohm specification is below the MDR-CD900ST’s 63 ohms.
• Wider stated frequency response → SONY MDR-M1ST. It is listed at 5–80,000 Hz, compared with 5–30,000 Hz for the MDR-CD900ST.
• Higher listed sensitivity → Sony MDR-CD900ST. It is specified at 106 dB/mW; the MDR-M1ST is listed at 103 dB/mW.
• Standard stereo plug → Sony MDR-CD900ST. Its sheet explicitly names a standard stereo plug. Check the connection you need before buying either model.
• A wired desk listening setup → either. Both are sealed dynamic over-ear headphones with 40 mm drivers and cables listed at about 2.5 meters.
• Meetings with a built-in microphone → neither, based on the listed features. Neither sheet identifies a microphone, so plan on a separate mic or choose a headset that includes one.
• Bluetooth headphones for meetings → neither. Both are wired, with no Bluetooth connection listed.
• Noise control for a busy room → neither. The listings specify no noise-control feature. A sealed design is not the same as an advertised active noise-cancellation or transparency system.
The meeting angle is worth being blunt about: neither model is a complete communications product on the available specifications. They may serve as wired headphones while you listen to a call, but a separate microphone is needed for your voice. They also do not answer searches for sports earbuds for meetings; these are over-ear wired headphones, not earbuds. And if you are searching for the best transparency mode gaming headphones for meetings, neither listing describes a transparency mode or gaming-specific feature.
That does not make either headphone a poor fit for a desk. It means the choice should be based on the headphone and connection you actually need, not on features the sheets do not show. If a laptop or audio interface is central to your setup, confirm its connector compatibility and decide whether you already have a separate mic.
I’d buy the SONY MDR-M1ST for a wired desk setup because its 24-ohm impedance and broader stated frequency response make it the more appealing spec choice for my priorities. For meetings, I would pair it with a separate microphone rather than expect a complete headset. If the standard stereo plug is the deciding factor for your equipment, I’d choose the MDR-CD900ST instead.
Neither lists a built-in microphone, Bluetooth, or noise control, so neither is a complete meeting headset. For listening to calls on a wired setup, choose based on the headphone specifications and connection you need, and plan for a separate mic.
The listed frequency response is broader on the MDR-M1ST, while the MDR-CD900ST has higher stated sensitivity. Those specifications alone do not establish which will sound better to you; they describe different measurable characteristics, not a complete listening comparison.
Are either of these Bluetooth headphones?
No Bluetooth connection is listed for either model. Both are described as wired headphones, and both have a cable listed at approximately 2.5 meters.
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