Audio Technica AT4033 ASM
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Audio Technica
https://www.audio-technica.com
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A Classic Recording Microphone, in a Complete aSM Version
The AT4033aSM follows the tradition of studio microphones designed to deliver detailed sound, usable on a wide range of sources. Its transformerless design aims to maintain clean and controlled low end while preserving natural attack. The aSM version emphasizes practicality, with accessories suited for regular use in home studios, control rooms, or on the go.
For Which Recordings and Profiles?
If you are looking for a reliable cardioid microphone to capture a voice with presence, defined overheads, or acoustic instruments requiring precision, the AT4033aSM is a solid choice. Its pad and high max SPL also make it suitable for more aggressive sources (brass, close percussion, guitar amp), while the high-pass filter helps clean up vibrations, stage rumble, or excessive proximity effect. It is also suitable for broadcast uses and fixed installations thanks to its controlled reproduction and connectors designed for professional audio chains.
Key Features for Clean and Controlled Capture
80 Hz High-Pass Filter: Clearer Low-End Spectrum
The 80 Hz high-pass filter (12 dB/octave) reduces mechanical noise, plosives, and room resonances. Very useful on vocals and overheads, it facilitates a cleaner mix right from the recording stage by limiting corrective work.
-10 dB Pad: More Headroom Before Saturation
Activating the -10 dB pad provides extra headroom to record loud sources without clipping your preamp input. Combined with a max SPL of 145 dB, it allows close placement and energetic takes while maintaining usable dynamics.
Technical specifications
| Frequency response | 30 Hz - 20 kHz |
| Category | studio microphone |
| Directivity | cardioid |
| Capsule | Large Diaphragm |
| Connection | XLR |
| Color | Black |
| Type | condenser microphone |
| Polar pattern | cardioid |
| Max SPL | 145 dB |
| Sensitivity | 32 dB (25.1 mV) ref 1 V/Pa |
| Nominal impedance | 100 ohms |
| High-pass filter | 80 Hz / 12 dB per octave |
| Attenuator pad | -10 dB |
| Required power | +48 V phantom |
| Included | carrying case and AT8449 shock mount |
| Dimensions | 170 x 53.4 mm |
| Weight | 380 g |
Questions frequently asked
Is the Audio Technica AT4033 ASM suitable for recording vocals?
Its cardioid pattern and large diaphragm allow for precise vocal capture. The 80 Hz high-pass filter with a 12 dB per octave slope reduces plosives and unwanted vibrations.
What equipment is included with this studio microphone?
The ASM version includes the AT8449 shock mount and a carrying case.
Is phantom power required for the AT4033aSM?
A +48 V phantom power supply is required to operate this condenser microphone. The connection is via XLR to a preamp, interface, or mixer that provides phantom power. Its nominal impedance is 100 ohms.
Can this microphone be placed in front of a guitar amp or brass instruments?
The switchable -10 dB pad provides additional headroom on loud sources. With a maximum SPL of 145 dB, this model handles close miking of guitar amps, brass, or percussion.
What are the dimensions and weight of the AT4033aSM?
The body measures 170 x 53.4 mm and weighs 380 g, not including the supplied AT8449 shock mount.



