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2. The 6 best-looking window air conditioners that ... - AOL

   www.aol.com/best-looking-window-air-conditioners...

   In comparison, the best-selling TOSOT Quiet Air Conditioner and the DELLA Whisper Quiet Energy Saving Window Air Conditioner, both come in at 54 to 59 decibels and 55 decibels, respectively.

3. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

4. Noise curve - Wikipedia

   en.wikipedia.org/wiki/Noise_curve

   Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

5. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   The effect of adding multiple layers of gypsum wallboard to a frame also varies depending on the framing type and configuration. [14] [15] Doubling the mass of a partition does not double the STC, as the STC is calculated from a non-linear decibel sound transmission loss measurement. [16]

6. Don’t Lose Your Cool—Here Are the Best Window Air ...

   www.aol.com/dont-lose-cool-best-window-193000344...

   LW6017R Window Air Conditioner. This high-performance, 6,000-BTU LG window air conditioner is designed to cool medium spaces quickly, ideal for rooms up to 10 by 25 feet.

7. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...

8. Windmill vs. July: What’s the best air conditioner? - AOL

   www.aol.com/news/windmill-vs-july-best-air...

   The Windmill AC $319.00 at Amazon. The Windmill AC $319.99 at Best Buy. The Windmill AC $299.00 at Windmill air. Windmill, unlike July, has two types of window air conditioners: its original model ...

9. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   A reverberation chamber is used to test the sound absorption coefficients and NRC of a material. The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency ...