SKU: 30738034710

Shure SM81-LC Cardioid Condenser Instrument Microphone for Guitar, Piano, and...

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Description

Shure SM81-LC Cardioid Condenser Instrument Microphone for Guitar, Piano, and...The Shure SM81 is a high quality, unidirectional condensermicrophone designed for studio recording, broadcasting, and soundreinforcement. Its wide frequency response, low noise characteristics, and lowRF susceptibility have made it a standard for applications involving acousticinstruments, especially guitar, piano, and cymbals. POWER REQUIREMENTS NOTE: This microphone requires phantom power and performs best with a 48 Vdc supply(IEC 61938). However,

The Shure SM81 is a high-quality, unidirectional condensermicrophone designed for studio recording, broadcasting, and soundreinforcement. Its wide frequency response, low noise characteristics, and lowRF susceptibility have made it a standard for applications involving acousticinstruments, especially guitar, piano, and cymbals. POWER REQUIREMENTS NOTE:This microphone requires phantom power and performs best with a 48 Vdc supply(IEC-61938). However, it will operate with slightly decreased headroom andsensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantompower. You must use a balanced microphone cable: XLR-to-XLR or XLR-to-TRS. Built to withstand the rigors of regular stage and studio use, theShure SM81 unidirectional condenser microphone is a great choice for studiorecording, broadcasting, and sound reinforcement. Its wide frequency response,low noise characteristics, and low RF susceptibility make it a perfect matchfor applications involving acoustic instruments, especially guitar, piano, andcymbals. Ruggedly constructed, the SM81 operates on phantom power and performsover a wide range of temperatures and humidity conditions. It comes with aswivel adapter, attenuator-switch lock, foam windscreen, and case for carryingand storage. Key Features Frequency response. Polar pattern.Flat responsecurve for accurate reproduction of sound sources Low noise and high outputclipping level Low distortion over a wide range of load impedances Cardioidpolar pattern, uniform with frequency and symmetric about axis, providingmaximum rejection and minimum coloration of off-axis sounds Low RFsusceptibility Selectable low-frequency response: flat, 6 or 18 dB/octaverolloff 0 dB/10 dB lockable attenuator switch Phantom powering (DIN 45 596voltages of 12 to 48 Vdc) Rugged steel construction for durability Field-usable over wide range of temperature and humidity conditionsSpecificationsType: Condenser (electret bias) Frequency Response: 20 to 20,000Hz Polar Pattern: Cardioid (unidirectional) response-uniform with frequency,symmetrical about axis Output Impedance: Rated at 150 ohms (85 ohms actual)Recommended minimum load impedance: 800 ohms (May be used with loads as low as150 ohms with reduced clipping level) Output Configuration and Connector:Balanced, transformer-coupled output; male XLR connector Sensitivity (at 1,000Hz): Open Circuit Voltage: -45 dBV/Pascal (5.6 mV); (1 Pascal = 94 dB SPL)Clipping Level (at 1,000 Hz): 800 ohm Load: -4 dBV (0.63 V); 150 ohm Load: -15dBV (0.18 V) Total Harmonic Distortion Less than 0.5% (131 dB SPL at 250 H: zinto 800 ohm load) Maximum SPL (at 1,000 Hz): 800 ohm load: 136 dB (attenuatorat 0) 146 dB (attenuator at -10) 150 ohm load: 128 dB (attenuator at 0) 138 dB(attenuator at -10) Hum Pickup: -3 dB equivalent SPL in a 1 mOe field (60 Hz)Self-Noise (equivalent sound pressure levels; measured with true rmsvoltmeter): 16 dB typical, A-weighted; 19 dB typical, weighted per DIN 45 405Signal-to-Noise Ratio: 78 dB (IEC 651) at 94 dB SPL S/N ratio is differencebetween 94 dB SPL and product's equivalent self noise (SPL A-weighted).Overvoltage and Reverse Polarity Protection: Max. external voltage applied topins 2 and 3 with respect to pin 1: +52 Vdc Reverse polarity protection: 200mA max. (diode-clamped) Polarity: Positive pressure on diaphragm producespositive voltage on pin 2 relative to pin 3 Cartridge Capacitance: 54 pF LowFrequency Response Switch Positions: Flat; -6 dB/octave below 100 Hz; -18dB/octave below 80 Hz Attenuator Switch Positions (Lockable): 0 or -10 dBPower: Supply Voltage: 11 to 52 Vdc, positive, pins 2 and 3 Current Drain: 1.2mA max. Case: Steel construction with vinyl metallic paint finish andstainless steel screens Weight: 8 ouncesThis microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom power. You must use a balanced microphone cable: XLR-to-XLR or XLR-to-TRS.The SM81 is ruggedly constructed. It operates on phantom power and performs over a wide range of temperatures and humidity conditions. It is furnished with a swivel adapter, attenuator-switch lock, foam windscreen, and case for carrying and storage. Other accessories are available.20 Hz to 20 kHz frequency response. Flat response curve for accurate reproduction of sound sources.Low noise and high output clipping level. Low distortion over a wide range of load impedances.Cardioid polar pattern, uniform with frequency and symmetric about axis, providing maximum rejection and minimum coloration of off-axis sounds.Low RF susceptibility.Selectable low-frequency response: flat, 6 or 18 dB/octave rolloff.
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SKU: 30738034710

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4.6 ★★★★★
Based on 26 reviews
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Tara
Draper, US
★★★★★ 5
Love it
Size: Queen, Color: White
This is such a nice pillow protector. It is super soft, the zipper works great, it has a decent weight to it, and definitely keeps the pillow cooler. I’m very impressed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
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Verified Purchase
Julie Lopp
Los Angeles, US
★★★★★ 5
Great product! I love the feel of these.
Size: Queen, Color: White
“I recently purchased the Serta Power Chill Cooling Pillow Protectors, and they have been a game-changer for my sleep comfort. These pillow protectors have exceeded my expectations in several ways. First and foremost, the cooling technology is fantastic. I tend to sleep hot, especially during the summer months, and these pillow protectors have made a noticeable difference. They keep my pillows cool and comfortable throughout the night, which has led to more restful and uninterrupted sleep. The fit is also excellent. They easily slip over my standard-sized pillows and stay securely in place without any annoying bunching, wrinkles or slipping during the night. And the zipper is amazing. Having no wrinkles in my cover is easier on my hair. What’s great about these protectors is that they not only keep my pillows cool but also protect them from spills, stains, and allergens. It gives me peace of mind knowing that my pillows are safeguarded while I enjoy a cool and refreshing sleep environment. There is no noise when sleeping on this cover, it’s soft. Cleaning is a breeze. They are machine-washable and maintain their cooling properties even after multiple washes. The quality of the materials used is evident. These protectors feel durable and well-made, promising long-lasting use. While they are slightly more expensive than basic pillow protectors, the added cooling benefits and protection they offer are well worth the investment. They’ve made a significant difference in my sleep quality, and I highly recommend the Serta Power Chill Cooling Pillow Protectors to anyone seeking a cooler and more comfortable night’s sleep.”
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Reviewed in the United States on October 6, 2023
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Verified Purchase
Birdie
Waukegan, US
★★★★★ 4
Loose on standard pillow.
Size: Queen, Color: White
Too large for standard pillow. It would fit a queen size pillow much better. It does stay cool.
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Reviewed in the United States on November 20, 2025
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AmazonSmile
Pawtucket, US
★★★★★ 5
Soft and cool. Very cool. 🧊
Size: Queen, Color: White
I bought these for my memory foam pillow and they’re excellent for cooling it. I use 2 of these on the pillow for maximum chill factor and it works. They’re very soft, the zippers are high quality. Easy to put on with a bit of stretch- generously sized. They’re stain resistant. I’m glad they’re NOT waterproof because they’d be too hot then. They’re very durable. Wash on delicate setting in a mesh bag and air dry and they last long. They’re very quiet- smooth and silky. Definitely recommend!
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Reviewed in the United States on January 15, 2026
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Verified Purchase
Jamie Cowan
Pawtucket, US
★★★★★ 3
Cool enough
Size: Queen, Color: White, Size: Queen, Color: White
I thought I had purchased pillows so when I received these I was a little disappointed. However that was 100% on me for not reading the listing and just trusting my search. I decided to give them a try and so far they seem ok. They don’t stay cool even though I have them on cooling pillows. They are super thin but very soft. They fit on my pillows perfectly. I don’t think it has improved my sleep quality but it hasn’t made it any worse either. I don’t think they are waterproof but I don’t really want to test that. I like that the zipper is small and seems to be decent quality. Smelled heavily of chemicals when I first took it out of the package but that disappeared after a few minutes.
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Reviewed in the United States on March 21, 2026

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