---
title: Difference Between A, C & Z Frequency Weightings
description: Frequency weightings help us adjust noise level readings so that they are more relevant or accurate to different contexts, such as human hearing response.
image: https://blog.echobarrier.com/hubfs/Sound-level-meter.jpg
---

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# Difference Between A, C & Z Frequency Weightings

Posted by [Echo Barrier](https://blog.echobarrier.com/blog/author/echo-barrier) on Feb 25, 2021, 6:35:32 PM  | [acoustics](https://blog.echobarrier.com/blog/tag/acoustics?hsLang=en-us) [a frequency weighting](https://blog.echobarrier.com/blog/tag/a-frequency-weighting?hsLang=en-us) [c frequency weighting](https://blog.echobarrier.com/blog/tag/c-frequency-weighting?hsLang=en-us) [frequency weightings](https://blog.echobarrier.com/blog/tag/frequency-weightings?hsLang=en-us) [z frequency weighting](https://blog.echobarrier.com/blog/tag/z-frequency-weighting?hsLang=en-us)

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![Sound level meter with frequency weighting](https://blog.echobarrier.com/hubfs/Sound-level-meter.jpg)

Frequency weightings allow us to adjust decibel readings taken by noise-measuring instruments in order to more accurately reflect the true noise level as perceived by humans. 

A, B, and Z weightings are examples of the types filters that are applied to adjust noise readings across the full acoustic spectrum (20 Hz to 20,000 Hz), resulting in slightly different measurements based on the desired aim.

 

---

## A Little On Acoustics

We measure sound energy with several units, including amplitude (loudness) and frequency (change in wave direction). Frequency is measured in hertz, Hz, named for the German physicist who studied sound.

The higher the frequency, the more sound waves pass your ear in a given time. High frequency sounds like whistles, sirens, and birds chirping contrast with low frequency sounds like thunder booming and trucks rumbling down a road.

## Not All Frequencies Are Heard Equally

Although two sounds sound may be read as equal in decibels, the human ear will interpret their loudness distinctly, based on where they lie on the frequency spectrum. 

The sensitivity of human hearing is demonstrated by the Fletcher-Munson equal-loudness contours.

 

![Equal-loudness contour - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Lindos1.svg/1200px-Lindos1.svg.png)

 

In order to more accurately read noise in accordance with the human response to noise stimuli, sound level meters apply electronic filters to give greater importance – or *weighting *– to different frequency ranges. 

Two of the most common filters, A and C, are human-weighted; the 'Z' weighting is more or less a control. 

 

![](https://blog.echobarrier.com/hubfs/a-c-and-z-weighting-curves-png.jpeg)

  
*Each filter has a different degree and kind of noise level attenuation. *

## 'A' Frequency Weighting

The 'A' frequency weighting is the most common, as it is designed to most closely match the inverse of the equal loudness curves, in order to more accurately . In fact, according to the international standard IEC 61672, it is mandated to be fitted to all sound level meters.

You can identify an A-weighted frequency measurements as dB(A), or by labels like LAeq, LAFmax, and LAE. 

 

## **C Frequency Weighting**

'C' frequency weighting is the standard weighting of audible frequencies typical with measurements of Peak Sound Pressure level.

This frequency weighting tracks human hearing just as the 'A' frequency weighting, but at higher noise levels (greater amplitude). The flatter curve emphasizes the effects of lower frequency sounds on human hearing.

Look for labels such as dB(C), C, dBC, LCeq, LCPeak, or LCE. LPeak, or Peak Sound Pressure, shows as LCPeak. 

 

## **Z Frequency Weighting**

'Z' stands for *zero*; this weighting produces a flat frequency response between 10 Hz and 20,000 Hz, meaning that there is no alteration to the true measurement, despite how a human might really perceive the noise. In effect, it is like having no filter at all. This is useful for octave band analysis and for determining environmental noise.

Z frequency weighting shows as labels such as dBZ or dB(Z), LZeq, LZFmax, or LZE.

 

---

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[Echo Barriers](http://echobarrier.com) help minimize the impact of noise on your surrounding environment, even in harsh weather and work conditions. They reduce noise by up to 43 dB:

 

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- [outdoor noise enclosure (2)](https://blog.echobarrier.com/blog/tag/outdoor-noise-enclosure)
- [power tool noise (2)](https://blog.echobarrier.com/blog/tag/power-tool-noise)
- [rail noise (2)](https://blog.echobarrier.com/blog/tag/rail-noise)
- [responsible contracting (2)](https://blog.echobarrier.com/blog/tag/responsible-contracting)
- [sound curtain (2)](https://blog.echobarrier.com/blog/tag/sound-curtain)
- [truck noise (2)](https://blog.echobarrier.com/blog/tag/truck-noise)
- [vertical hanging barriers (2)](https://blog.echobarrier.com/blog/tag/vertical-hanging-barriers)
- [water pump noise (2)](https://blog.echobarrier.com/blog/tag/water-pump-noise)
- [waterproof noise barriers (2)](https://blog.echobarrier.com/blog/tag/waterproof-noise-barriers)
- [worker health (2)](https://blog.echobarrier.com/blog/tag/worker-health)
- [1972 (1)](https://blog.echobarrier.com/blog/tag/1972)
- [2015 fracking ban nyc (1)](https://blog.echobarrier.com/blog/tag/2015-fracking-ban-nyc)
- [ARA Show 2019 (1)](https://blog.echobarrier.com/blog/tag/ara-show-2019)
- [ARA show 2022 (1)](https://blog.echobarrier.com/blog/tag/ara-show-2022)
- [Acoustic Barriers (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriers-de)
- [Acoustic Barriers|Background Related (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriersbackground-related)
- [Acoustic Barriers|Construction Related|Rail Relate (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriersconstruction-relatedrail-related)
- [Acoustic Barriers|Council Responsibility Related|N (1)](https://blog.echobarrier.com/blog/tag/acoustic-barrierscouncil-responsibility-relatednoi)
- [Acoustic Barriers|Events Related|Noise Reduction (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriersevents-relatednoise-reduction)
- [Construction Related|Events Related|Noise Reductio (1)](https://blog.echobarrier.com/blog/tag/construction-relatedevents-relatednoise-reductionu)
- [E.N.D (1)](https://blog.echobarrier.com/blog/tag/e-n-d)
- [EIA (1)](https://blog.echobarrier.com/blog/tag/eia)
- [Events Related (1)](https://blog.echobarrier.com/blog/tag/eventsrelated)
- [Events Related|Noise Reduction (1)](https://blog.echobarrier.com/blog/tag/events-relatednoise-reduction)
- [Events Related|Uncategorised (1)](https://blog.echobarrier.com/blog/tag/events-relateduncategorised)
- [Hydraulic Hammers (1)](https://blog.echobarrier.com/blog/tag/hydraulic-hammers)
- [Insider (1)](https://blog.echobarrier.com/blog/tag/insider)
- [LA sound ordnance (1)](https://blog.echobarrier.com/blog/tag/la-sound-ordnance)
- [NoiStop (1)](https://blog.echobarrier.com/blog/tag/noistop)
- [Noise Barriers (1)](https://blog.echobarrier.com/blog/tag/noise-barriers-it)
- [Noise Reduction (1)](https://blog.echobarrier.com/blog/tag/noise-reduction-gb-fr)
- [Noise Reduction (1)](https://blog.echobarrier.com/blog/tag/noise-reduction-gb-it)
- [STC 30 (1)](https://blog.echobarrier.com/blog/tag/stc-30)
- [Tool specific solutions (1)](https://blog.echobarrier.com/blog/tag/tool-specific-solutions)
- [What is the environmental noise directive? (1)](https://blog.echobarrier.com/blog/tag/what-is-the-environmental-noise-directive)
- [a frequency weighting (1)](https://blog.echobarrier.com/blog/tag/a-frequency-weighting)
- [absorption coefficient (1)](https://blog.echobarrier.com/blog/tag/absorption-coefficient)
- [ac noise barrier (1)](https://blog.echobarrier.com/blog/tag/ac-noise-barrier)
- [acoustic barrier hire (1)](https://blog.echobarrier.com/blog/tag/acoustic-barrier-hire)
- [acoustic barrier products (1)](https://blog.echobarrier.com/blog/tag/acoustic-barrier-products-fr)
- [acoustic barrier products (1)](https://blog.echobarrier.com/blog/tag/acoustic-barrier-products-ar)
- [acoustic barrier recycling (1)](https://blog.echobarrier.com/blog/tag/acoustic-barrier-recycling)
- [acoustic barriers for events (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriers-for-events)
- [acoustic barriers live event noise (1)](https://blog.echobarrier.com/blog/tag/acoustic-barriers-live-event-noise)
- [acoustic cutting station (1)](https://blog.echobarrier.com/blog/tag/acoustic-cutting-station)
- [acoustics beginner (1)](https://blog.echobarrier.com/blog/tag/acoustics-beginner)
- [acoustics trees (1)](https://blog.echobarrier.com/blog/tag/acoustics-trees)
- [after hours work permit (1)](https://blog.echobarrier.com/blog/tag/after-hours-work-permit)
- [air compressor noise reduction (1)](https://blog.echobarrier.com/blog/tag/air-compressor-noise-reduction)
- [air conditioner noise reduction blanket (1)](https://blog.echobarrier.com/blog/tag/air-conditioner-noise-reduction-blanket)
- [air conditioner sound proofing (1)](https://blog.echobarrier.com/blog/tag/air-conditioner-sound-proofing)
- [android app (1)](https://blog.echobarrier.com/blog/tag/android-app)
- [austin construction noise (1)](https://blog.echobarrier.com/blog/tag/austin-construction-noise)
- [best app to measure noise level (1)](https://blog.echobarrier.com/blog/tag/best-app-to-measure-noise-level)
- [best hearing protection (1)](https://blog.echobarrier.com/blog/tag/best-hearing-protection)
- [bitcoin (1)](https://blog.echobarrier.com/blog/tag/bitcoin)
- [bitmining (1)](https://blog.echobarrier.com/blog/tag/bitmining)
- [bulldozer noise (1)](https://blog.echobarrier.com/blog/tag/bulldozer-noise)
- [c frequency weighting (1)](https://blog.echobarrier.com/blog/tag/c-frequency-weighting)
- [cancer caused by silica (1)](https://blog.echobarrier.com/blog/tag/cancer-caused-by-silica)
- [children noise pollution impact (1)](https://blog.echobarrier.com/blog/tag/children-noise-pollution-impact)
- [clean echo barrier (1)](https://blog.echobarrier.com/blog/tag/clean-echo-barrier)
- [community relations (1)](https://blog.echobarrier.com/blog/tag/community-relations)
- [construction management (1)](https://blog.echobarrier.com/blog/tag/construction-management)
- [construction noise complaints (1)](https://blog.echobarrier.com/blog/tag/construction-noise-complaints)
- [construction noise florida (1)](https://blog.echobarrier.com/blog/tag/construction-noise-florida)
- [construction safety week (1)](https://blog.echobarrier.com/blog/tag/construction-safety-week)
- [crane noise (1)](https://blog.echobarrier.com/blog/tag/crane-noise)
- [crypto (1)](https://blog.echobarrier.com/blog/tag/crypto)
- [crystalline silica (1)](https://blog.echobarrier.com/blog/tag/crystalline-silica)
- [decibel meter app (1)](https://blog.echobarrier.com/blog/tag/decibel-meter-app)
- [demolition dust (1)](https://blog.echobarrier.com/blog/tag/demolition-dust)
- [difference between loudness and volume (1)](https://blog.echobarrier.com/blog/tag/difference-between-loudness-and-volume)
- [dust barriers (1)](https://blog.echobarrier.com/blog/tag/dust-barriers)
- [echo barrier storage (1)](https://blog.echobarrier.com/blog/tag/echo-barrier-storage)
- [echo barrier storing (1)](https://blog.echobarrier.com/blog/tag/echo-barrier-storing)
- [electrical transformer noise (1)](https://blog.echobarrier.com/blog/tag/electrical-transformer-noise)
- [environmental noise (1)](https://blog.echobarrier.com/blog/tag/environmental-noise)
- [environmental noise directive (1)](https://blog.echobarrier.com/blog/tag/environmental-noise-directive)
- [environmental noise directive explained (1)](https://blog.echobarrier.com/blog/tag/environmental-noise-directive-explained)
- [environmental protection agency (1)](https://blog.echobarrier.com/blog/tag/environmental-protection-agency)
- [equipment rental (1)](https://blog.echobarrier.com/blog/tag/equipment-rental)
- [festival noise complaints (1)](https://blog.echobarrier.com/blog/tag/festival-noise-complaints)
- [florida noise laws (1)](https://blog.echobarrier.com/blog/tag/florida-noise-laws)
- [freight noise (1)](https://blog.echobarrier.com/blog/tag/freight-noise)
- [frequency weightings (1)](https://blog.echobarrier.com/blog/tag/frequency-weightings)
- [glossary (1)](https://blog.echobarrier.com/blog/tag/glossary)
- [hearing protection guide (1)](https://blog.echobarrier.com/blog/tag/hearing-protection-guide)
- [heavy site equipment (1)](https://blog.echobarrier.com/blog/tag/heavy-site-equipment)
- [highway noise wall (1)](https://blog.echobarrier.com/blog/tag/highway-noise-wall)
- [home renovation (1)](https://blog.echobarrier.com/blog/tag/home-renovation)
- [hotel (1)](https://blog.echobarrier.com/blog/tag/hotel)
- [how to install industrial sound blankets (1)](https://blog.echobarrier.com/blog/tag/how-to-install-industrial-sound-blankets)
- [how to reduce air conditioner noise (1)](https://blog.echobarrier.com/blog/tag/how-to-reduce-air-conditioner-noise)
- [how to reduce industrial noise (1)](https://blog.echobarrier.com/blog/tag/how-to-reduce-industrial-noise)
- [how to reduce noise on site (1)](https://blog.echobarrier.com/blog/tag/how-to-reduce-noise-on-site)
- [how to stop fracking noise pollution (1)](https://blog.echobarrier.com/blog/tag/how-to-stop-fracking-noise-pollution)
- [hvac noise barrier (1)](https://blog.echobarrier.com/blog/tag/hvac-noise-barrier)
- [hvac noise barriers (1)](https://blog.echobarrier.com/blog/tag/hvac-noise-barriers)
- [jackhammer (1)](https://blog.echobarrier.com/blog/tag/jackhammer)
- [jobsite safety (1)](https://blog.echobarrier.com/blog/tag/jobsite-safety)
- [krakatoa (1)](https://blog.echobarrier.com/blog/tag/krakatoa)
- [learn more about fracking (1)](https://blog.echobarrier.com/blog/tag/learn-more-about-fracking)
- [logistics noise (1)](https://blog.echobarrier.com/blog/tag/logistics-noise)
- [loud pile drivers (1)](https://blog.echobarrier.com/blog/tag/loud-pile-drivers)
- [loudest noise on earth (1)](https://blog.echobarrier.com/blog/tag/loudest-noise-on-earth)
- [loudness vs volume (1)](https://blog.echobarrier.com/blog/tag/loudness-vs-volume)
- [mayor new york fracking ban (1)](https://blog.echobarrier.com/blog/tag/mayor-new-york-fracking-ban)
- [mine noise (1)](https://blog.echobarrier.com/blog/tag/mine-noise)
- [natural noise absorption (1)](https://blog.echobarrier.com/blog/tag/natural-noise-absorption)
- [neighbourhood noise (1)](https://blog.echobarrier.com/blog/tag/neighbourhood-noise)
- [new york fracking ban (1)](https://blog.echobarrier.com/blog/tag/new-york-fracking-ban)
- [new york noise (1)](https://blog.echobarrier.com/blog/tag/new-york-noise)
- [noise control act (1)](https://blog.echobarrier.com/blog/tag/noise-control-act)
- [noise control laws (1)](https://blog.echobarrier.com/blog/tag/noise-control-laws)
- [noise fence panels (1)](https://blog.echobarrier.com/blog/tag/noise-fence-panels)
- [noise reduction in mining (1)](https://blog.echobarrier.com/blog/tag/noise-reduction-in-mining)
- [noise texas (1)](https://blog.echobarrier.com/blog/tag/noise-texas)
- [nrc (1)](https://blog.echobarrier.com/blog/tag/nrc)
- [pickleball noise (1)](https://blog.echobarrier.com/blog/tag/pickleball-noise)
- [pile driver noise (1)](https://blog.echobarrier.com/blog/tag/pile-driver-noise)
- [portable air conditioner (1)](https://blog.echobarrier.com/blog/tag/portable-air-conditioner)
- [portable cutting station (1)](https://blog.echobarrier.com/blog/tag/portable-cutting-station)
- [project manager (1)](https://blog.echobarrier.com/blog/tag/project-manager)
- [pros and cons of fracking (1)](https://blog.echobarrier.com/blog/tag/pros-and-cons-of-fracking)
- [quiet (1)](https://blog.echobarrier.com/blog/tag/quiet)
- [quiet generators (1)](https://blog.echobarrier.com/blog/tag/quiet-generators)
- [quietest circular saw (1)](https://blog.echobarrier.com/blog/tag/quietest-circular-saw)
- [quietest generators (1)](https://blog.echobarrier.com/blog/tag/quietest-generators)
- [quietest jackhammers (1)](https://blog.echobarrier.com/blog/tag/quietest-jackhammers)
- [quietest table saws (1)](https://blog.echobarrier.com/blog/tag/quietest-table-saws)
- [recycle (1)](https://blog.echobarrier.com/blog/tag/recycle)
- [reducing noise from cutting (1)](https://blog.echobarrier.com/blog/tag/reducing-noise-from-cutting)
- [reducing noise on indoor construction sites (1)](https://blog.echobarrier.com/blog/tag/reducing-noise-on-indoor-construction-sites)
- [remodelling (1)](https://blog.echobarrier.com/blog/tag/remodelling)
- [renovation (1)](https://blog.echobarrier.com/blog/tag/renovation)
- [reusable acoustic barriers (1)](https://blog.echobarrier.com/blog/tag/reusable-acoustic-barriers)
- [road noise barrier (1)](https://blog.echobarrier.com/blog/tag/road-noise-barrier)
- [safe and sound week (1)](https://blog.echobarrier.com/blog/tag/safe-and-sound-week)
- [season (1)](https://blog.echobarrier.com/blog/tag/season)
- [seasonal rentals (1)](https://blog.echobarrier.com/blog/tag/seasonal-rentals)
- [site barriers (1)](https://blog.echobarrier.com/blog/tag/site-barriers-es)
- [solutions for mitigating noise at festivals (1)](https://blog.echobarrier.com/blog/tag/solutions-for-mitigating-noise-at-festivals)
- [sonyc (1)](https://blog.echobarrier.com/blog/tag/sonyc)
- [sound apps (1)](https://blog.echobarrier.com/blog/tag/sound-apps)
- [sounds blankets for live events and concerts (1)](https://blog.echobarrier.com/blog/tag/sounds-blankets-for-live-events-and-concerts)
- [sports and community (1)](https://blog.echobarrier.com/blog/tag/sports-and-community)
- [summer construction (1)](https://blog.echobarrier.com/blog/tag/summer-construction)
- [sustainable (1)](https://blog.echobarrier.com/blog/tag/sustainable)
- [sustainable acoustic barriers, (1)](https://blog.echobarrier.com/blog/tag/sustainable-acoustic-barriers)
- [temporary sound absorbing blankets (1)](https://blog.echobarrier.com/blog/tag/temporary-sound-absorbing-blankets)
- [traffic noise (1)](https://blog.echobarrier.com/blog/tag/traffic-noise)
- [traffic noise barrier (1)](https://blog.echobarrier.com/blog/tag/traffic-noise-barrier)
- [traffic noise wall (1)](https://blog.echobarrier.com/blog/tag/traffic-noise-wall)
- [transformer (1)](https://blog.echobarrier.com/blog/tag/transformer)
- [transformer noise (1)](https://blog.echobarrier.com/blog/tag/transformer-noise)
- [tree noise absorption (1)](https://blog.echobarrier.com/blog/tag/tree-noise-absorption)
- [tree sound absorption (1)](https://blog.echobarrier.com/blog/tag/tree-sound-absorption)
- [truck stop noise (1)](https://blog.echobarrier.com/blog/tag/truck-stop-noise)
- [truck terminal noise (1)](https://blog.echobarrier.com/blog/tag/truck-terminal-noise)
- [truck yard noise (1)](https://blog.echobarrier.com/blog/tag/truck-yard-noise)
- [using echo barriers (1)](https://blog.echobarrier.com/blog/tag/using-echo-barriers)
- [wash echo barrier (1)](https://blog.echobarrier.com/blog/tag/wash-echo-barrier)
- [waterproof acoustic panels (1)](https://blog.echobarrier.com/blog/tag/waterproof-acoustic-panels)
- [wedding (1)](https://blog.echobarrier.com/blog/tag/wedding)
- [what is environmental noise? (1)](https://blog.echobarrier.com/blog/tag/what-is-environmental-noise)
- [winter (1)](https://blog.echobarrier.com/blog/tag/winter)
- [z frequency weighting (1)](https://blog.echobarrier.com/blog/tag/z-frequency-weighting)

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