Two Compact Stereo Mics for On-Camera Audio
If you are looking to upgrade your camera’s built-in audio, the Azden SMX-20 and Sony ECM-MS908C are two compact stereo microphones designed for DSLR and camcorder use. Both mount via a shoe attachment, connect with a 1/8" (3.5mm) plug, and aim to deliver cleaner stereo sound than your camera’s internal mic. However, their design philosophies and power requirements differ in ways that may affect your choice.
Key Specifications at a Glance
- Azden SMX-20 DSLR Stereo Microphone: The Azden SMX-20 measures 5" (12.7cm) long and is powered by an included LR44 battery. Battery power means the SMX-20 does not draw power from the camera, which can be useful for cameras with limited plug-in power. Its compact length keeps it unobtrusive on small DSLR bodies.
Azden SMX-20 DSLR Stereo Microphone - Sony ECM-MS908C Stereo Condenser Microphone for Camera: The Sony ECM-MS908C uses a Mid/Side (MS) stereo capsule design and offers a switch to select 90° or 120° pickup angle. The MS design and adjustable pickup angle give you control over stereo width, letting you match the mic’s coverage to your shot — tighter for close-ups, wider for landscapes.
Sony ECM-MS908C Stereo Condenser Microphone for Camera
Power and Connection Differences
The Azden SMX-20 runs on an LR44 battery (included), which means it does not rely on the camera’s plug-in power. This can be a practical advantage if your camera does not supply consistent power through the microphone jack, or if you simply prefer a self-powered mic. The SMX-20 connects via an attached coiled cable with a 1/8" (3.5mm) plug.
The Sony ECM-MS908C, by contrast, uses an L-shaped stereo mini-plug and is designed to work with cameras and recorders that supply plug-in power. The supplied information does not confirm whether it includes a battery or operates solely on camera power. If your camera does not provide plug-in power, the Sony mic may not function correctly. Check your camera’s specifications before choosing.
Pickup Pattern and Stereo Imaging
Both mics record stereo sound, but they achieve it differently. The Azden SMX-20 is described as a highly directional stereo microphone. Its fixed pickup pattern is suited for capturing sound in front of the camera, similar to a shotgun mic but in stereo. This makes it a good fit for interviews or vlogging where the subject is centered.
The Sony ECM-MS908C uses a Mid/Side (MS) stereo technique, with separate capsules for mid and side channels. An MS switch lets you choose between 90° (narrower, for close-ups or noisy environments) and 120° (wider, for quieter scenes or wide shots). This flexibility is valuable if you shoot a variety of scenes and want to adjust the stereo spread without post-processing.
- Azden SMX-20: Highly directional stereo mic; fixed pickup. Best for focused, centered audio capture.
- Sony ECM-MS908C: MS stereo with switchable pickup angle (90° or 120°). More control over stereo width depending on the scene.
Which Mic Fits Your Setup?
Choose the Azden SMX-20 if you want a self-powered, compact stereo mic that works independently of your camera’s power output. It’s a straightforward upgrade for DSLR video, especially if you often shoot interviews or need a mic that remains largely out of the frame.
Choose the Sony ECM-MS908C if you value adjustable stereo width and shoot varied scenes — from close-ups to wide landscapes. Its MS design gives you creative control that the SMX-20 does not offer. However, ensure your camera provides plug-in power, as the Sony mic’s operation may depend on it.
