Audio-Technica AT4021

Small-diaphragm Condenser Microphone with Cardioid Pickup Pattern, 10dB Pad, Switchable 80Hz Highpass Filter, and 20Hz-20kHz Frequency Response
Audio-Technica AT4021 image 1
Audio-Technica AT4021 image 1
Sweetwater Savings: $150.00 MSRP: $499.00
Special Financing - Ends Jul 6

Or just $10/month§ for 36 months

0% interest for 36 months**. 36 equal monthly payments required. Valid through 7/6/2017. Learn more

Special Order
Special-ordered from Audio-Technica and usually arrives to you within 1-2 weeks. Please note: special orders cannot be canceled or returned.
Note: While most of the items we sell ship for free, this item does not qualify for free shipping due to special circumstances.

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Audio-Technica AT4021
Special Order

Focused, Flat Response!

The Audio-Technica AT4021 is versatile small-diaphragm condenser microphone that's perfect for both the studio and the stage. The AT4021's cardioid pickup pattern helps to improve isolation of your sound source, and an onboard switch lets you choose between a flat response, or a rolled-off response at 80Hz, to eliminate low-frequency rumble. It's a good choice for miking acoustic guitars or for using as a drum overhead microphone. Essential accessories, including a stand clamp, a windscreen, and a protective carrying case, are included with the Audio-Technica AT4021 small-diaphragm condenser microphone.

Audio-Technica AT4021 Small-diaphragm Condenser Microphone at a Glance:
  • Studio and stage-worthy microphone, great for acoustic guitar and drums
  • 10dB pad and 80Hz highpass filter, for tailoring the AT4021 to the source

Studio and stage-worthy microphone, great for acoustic guitar and drums
A member of Audio-Technica's rugged 40-series microphones, the AT4021 is a worthy choice for both stage- and studio-miking needs. It features a cardioid pickup pattern for excellent sonic isolation from other instruments, and its low self-noise keeps it usable in critical studio applications. You'll find the AT4021 to be an especially good choice for miking acoustic guitars, as well as for using as drum overhead microphones, in a pair.

10dB pad and 80Hz highpass filter, for tailoring the AT4021 to the source
The Audio-Technica AT4021 lets you tailor its response to whatever source you happen to be miking. Already, it features high SPL handling - 146dB - and, with its 10dB pad engaged, you can comfortably handle sources up to 156dB SPL, without distortion. This makes the AT4021 especially useful in drum-miking situations. What's more, an onboard highpass filter at 80Hz helps to take out the muddy low frequencies, giving you a cleaner sound when recording more articulate, high-frequency-emphasized instruments.

Audio-Technica AT4021 Small-diaphragm Condenser Microphone Features:
  • Polar pickup pattern: Cardioid
  • Frequency Response: 20Hz-20kHz
  • Low-frequency Roll-off: 80Hz, 12dB/octave
  • Open Circuit Sensitivity: -34dB (19.9mV) re 1V at 1 Pa
  • Impedance: 250 ohms
  • Maximum SPL: 146dB SPL, 1 kHz at 1% T.H.D.; 156dB SPL, with 10 dB pad (nominal)
  • Self-noise: 14dB SPL
  • Dynamic Range (Typical): 132dB, 1kHz at Max SPL
  • Signal-to-noise Ratio: 80dB, 1kHz at 1 Pa
  • Switches:Flat, roll-off; 10dB pad
  • Weight: 4.2 oz.
  • Dimensions: 5.67" long, .83" maximum body diameter
  • Output Connector: Integral 3-pin XLRM-type
  • Included Accessories: AT8405a stand clamp for 5/8"-27 threaded stands; windscreen; protective carrying case
  • Requires +48V phantom power
Choose the Audio-Technica AT4021 for a focused pickup pattern and flat response - on the stage or in the studio!

What Does "Special Order" Mean?

A special-order product is one that we don't normally keep in stock. We order it from the manufacturer as soon as you order from us. We have great relationships with all the manufacturers we carry, so we can get your special order to you as fast as or faster than anyone else. Remember that special orders are non-returnable and non-cancelable, so make sure the item is right for you. A Sweetwater Sales Engineer can help you decide — call (800) 222-4700 for assistance!

Additional Media

AT4021 Spec Sheet
Studio Microphone Buying Guide

Tech Specs

Microphone Type Condenser
Polar Pattern Cardioid
Diaphragm Size 0.64" (16.3mm)
Frequency Response 20Hz-20kHz
Max SPL 146dB (156dB w/Pad)
Output Impedance 250 ohms
Signal to Noise Ratio 80dB
Self Noise 14dB
Low Cut Filter 80Hz (-12dB/octave)
Pads -10dB
Connector XLR
Weight 0.26 lbs.
Manufacturer Part Number AT4021

Customer Reviews

Based on 4 reviews
Write your review

Great Acoustic Mic

Did a shootout of mics including the AT4021, Rode NT5, Josephson C42, AKG C 451 B, Telefunkin M60, Bock 195. The AT4021 won by far. More focused, clarified sound. Overall character of the sound was awesome. Captured the sound of my Martin 000-17sm perfectly.
Music background: Songwriter/Producer

Audio-Technica AT4021 for acoustic guitar

Great mic for acoustic, it brings the shimmer and sparkle.

Best Acoustic Mic ever

I always loved the mojo of the 2021 but it had the nastiest noisefloor at 19 db!! This baby has less noise than the SM81 but it just has a better coloration (though still very flat response) and just brings that magical presence out in string noise/harmonics that NEVER gets annoying. Amazing Mic (try on toms too)
Music background: Chief Engineer at the STudio of Light


The only reason that I'm giving this mic a 4.5 and not a 5.0 is that I wish the pad, & response switch wasn't inset. Now to the meat and potatoes. I bought this mic for acoustic guitar in my studio. Upon opening the box, I'll say that the build of this mic is solid. Doesn't feel lightweight and cheap.The sound is fantastic. I play a Breedlove so was looking for something that would fit well with it, and this mic does all that. Very nice flat response, not too bright. Last night I mic'd up a mandolin and did a comparison against my Shure Ksm44. Myself, and the mandolin player both agreed that the AT4021 sounded better. Or maybe I should say that it did a better job capturing the mandolin. I've also used this mic for recording tambourine, and shakers, and it works great. When I was shopping for a new mic, I almost bought the more expensive AT4051, I'm glad I didn't as you get your monies worth with this baby.
Music background: Singer/Songwriter/Studio Owner
See also: Condenser Mics, Audio-Technica, Audio-Technica Condenser Microphones, Audio-Technica Condenser Microphones