bose noise canceling headset manual

1 post / 0 new
flotaganis
bose noise canceling headset manual

bose noise canceling headset manual

LINK 1 ENTER SITE >>> Download PDF
LINK 2 ENTER SITE >>> Download PDF



File Name:bose noise canceling headset manual.pdf

Size: 3529 KB

Type: PDF, ePub, eBook

Category: Book

Uploaded: 24 May 2019, 23:38 PM

Rating: 4.6/5 from 704 votes.



Status: AVAILABLE



Last checked: 4 Minutes ago!

In order to read or download bose noise canceling headset manual ebook, you need to create a FREE account.

Download Now!

eBook includes PDF, ePub and Kindle version



✔ Register a free 1 month Trial Account.

✔ Download as many books as you like (Personal use)

✔ Cancel the membership at any time if not satisfied.

✔ Join Over 80000 Happy Readers




bose noise canceling headset manualLearn more or change settings here. Just type your request belowQuick tip: Try searching for just one or two words (e.g., connection help). Changes or modifications not expressly approved by Bose Corporation could void the user’s authority to operate this equipment. No part of this work may be reproduced, modified, distributed or otherwise used without prior written permission. Checking the battery.Contact your authorized Bose dealer immediately or call Bose customer service. For contact information, refer to the quick start guide in the carton. Using noise reduction only Noise reduction is activated when you power on the headphones. Note: If the headphone battery is depleted, you cannot use noise reduction.While charging, the battery indicator blinks amber. Before you can stream music from a Bluetooth device, you must pair the device with your headphones.Once paired, you hear “Connected to ” or the Bluetooth indicator glows solid white. Refer to the owner’s guide for your device to learn more about these features. 3. All Bluetooth devices are cleared and the headphones are ready to pair a new device. Answer a second incoming call While on a call, press once. The scrim is the inner screen which covers and protects the components inside the earcup. Important Safety InstructionsInstall in accordance with the manufacturer’s instructions.If this happens, turn the headphones off and contact. Bose customer service.Contains small parts which may be a choking hazard. Not suitable for children under age 3. This product contains magnetic material. Consult your physician on whether this might affect your implantablePart 15 of the FCC Rules.http://m-isc.com/userfiles/bosch-washer-manual-english.xml

    Tags:
  • bose noise cancelling headphones 700 manual, bose noise cancelling headphones user manual, bose noise canceling headphones manual, bose noise canceling earbuds manual, bose noise cancelling headphones manual pdf, bose noise cancelling earphones manual, bose noise cancelling earbuds manual pdf, bose noise canceling headphones instructions, bose noise canceling headphones 700 manual, bose noise cancelling headphones instruction manual, bose noise canceling headset manual.

These limits are designed to provide reasonable protection against harmful interference in aThis equipment generates, uses, and can radiate radio frequency energy and, if not installed andHowever, there is noIf this equipment does cause harmful interferenceChanges or modifications not expressly approved by Bose Corporation could void the user’s authority to operate thisThis device complies with part 15 of the FCC Rules and with Industry Canada license-exempt RSS standard(s).OperationThis device complies with FCC and Industry Canada radiation exposure limits set forth for general population. It must not be co-located or operating in conjunction with any other antenna or transmitter. Meets IDA Requirements. Management Regulation for Low-power Radio-frequency Devices. Article XII. According to “Management Regulation for Low-power Radio-frequency Devices” without permission granted by the. NCC, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter originalArticle XIV. The low power radio-frequency devices shall not influence aircraft security and interfere legal communications; If found,The said legal communications means radioThe low power radio-frequency devices must be susceptible with the interference from legal communications or ISMBose Corporation hereby declares that this product is in compliance with the essential requirements and other. The complete declaration of. Please dispose of used batteries properly, following local regulations. Do not incinerate.Proper disposal and recycling helps protect natural resources,For more information on disposal and recycling of this product,Please contact your local Bose retailer or see for furtherNames and Contents of Toxic or Hazardous Substances or Elements. Toxic or Hazardous Substances and Elements. Part Name. LeadMercuryCadmiumHexavalentBiphenylMetal Parts. Plastic Parts. Speakers.http://milkexim.ru/imgeditor/bosch_washer_manual_release.xml CablesDate of Manufacture: The eighth digit in the serial number indicates the year of manufacture; “5” is 2005 or 2015.EU Importer: Bose GP, Castleblayney Road, Carrickmacross, County Monaghan, Ireland. Taiwan Importer: Bose Taiwan Branch, 9F-A1, No.10, Section 3, Minsheng East Road, Taipei City 104, TaiwanApp Store is a service mark of Apple Inc. Android and Google Play are trademarks of Google Inc.The N-Mark is a trademark or registered trademark of NFC Forum, Inc.Unpacking. Headphone components. Powering on your headphones. Using noise reduction only. Charging the Battery. Connecting the USB cable. 10. Checking the battery. 10. Headphone Status Indicators. Battery indicator (Pre-installed languages. 12. Changing the language. 12. Disabling voice prompts. 12. Choosing your pairing method. 13. Managing Multiple ConnectionsMedia playback and volume functions. 18. Call functions. 19. Connecting a Device to the AUX Connector. Using the back-up audio cable. 20. Care and Maintenance. Storing your headphones. 21. Cleaning your headphones. 21. Replacement parts and accessories. 22. Limited Warranty. 22. Technical Information. 22. Troubleshooting. 23Carefully unpack the carton and confirm that the following parts are included. USB charging cable. Carry case. Back-up audio cable. Airline adapter. If any part of the headphones appears to be damaged, do not attempt to use it. Contact your authorized Bose dealer immediately or call Bose customer service. For contact information, refer to the quick start guide in the carton.Back-upMicrophone. Headphone controls. Battery andNFC touchpoint. USB chargingSlideUsing noise reduction only. Noise reduction is activated when you power on the headphones:If the headphone battery is depleted, you cannot use noise reduction.While charging, the battery indicator blinks amber. When the battery is fully charged, the battery indicator glows green. Checking the battery.https://congviendisan.vn/vi/3m-attest-1291-manual Each time you power on the headphones, the voice prompt announces the hWhile the headphones are in use, the battery indicator blinks red when the batteryIf you are connected to an iOS device, the device displays the headphone bSystem state. Blinking blue. Ready to pair. Blinking white. Connecting. Solid white. Connected. Battery indicator (. Indicator activity. System state. Green. Medium to full charge. Amber. Low charge. Blinking red. Need to chargePre-installed languages. To download another languageChanging the languageDisabling voice prompts. Press and holdNote: Repeat to re-enable voice prompts.Before you can streamChoosing your pairing methodWhat is NFC?Refer to your device owner’sNFC or if you are unsure. Follow the instructions for Bluetooth pairingIf your device supports Bluetooth pairingFollow the instructions for NFC pairing onNote: If your device supports Bluetooth pairing via NFC, you can use eitherTip: The Bluetooth menu is usually found in the Settings menu. Once paired, you hear “Connected to ” or the Bluetooth indicatorRefer to the owner’sYour device may prompt you to accept pairing.Note: You can only play audio from one device at a time.SlideRepeat until you hear the correct device name.Clearing the headphone pairing listVolume up. Multi-function button. Volume down. Media playback and volume functions. Function. What to do. Press. Skip Forward. PressFast Forward. PressSkip Backward. PressRewind. PressVolume Up. Volume Down. PressCall functions. Answer a call. End a call. Decline an incoming call. Press and hold. Answer a second incoming call. While on a call, press. Decline a second incoming callWhile on a call, press and holdWhile on a call, press and hold. Switch between two calls. With two active calls, pressCreate a conference call. With two active calls, press and hold. Activate voice control.http://ambarevleri.com/images/bose-noise-canceling-headset-manual.pdf Refer to the owner’s guide for your device for moreUse the supplied back-up audio cable to connect a non-wireless device, or if the headphone battery is depleted.The earcups rotate for easy, convenient storage. Place the headphones flat into the caseCleaning your headphones. The headphones do not require scheduled cleaning. Should cleaning be necessary. Do not allow moisture to getDo not use liquids or sprays.Replacement parts and accessoriesLimited WarrantyFailure to register will not affect your limitedThe warranty information provided with this product does not apply in. Australia and New Zealand. Technical Information. Input Rating: 5VDCWhat to do. Headphones do notHeadphones do notBluetooth list on your device. Pair again. Headphones do not pairNo soundPoor sound qualityWhat to doPoor sound quality fromHeadphones won’t chargeAMXXXXXX Rev. XXPDF Version: 1.4. Linearized: Yes. Create Date: 2015:12:01 11:56:47-05:00. Metadata Date: 2015:12:01 11:56:57-05:00. Modify Date: 2015:12:01 11:56:57-05:00. Creator Tool: Adobe InDesign CC 2015 (Windows). Instance ID: uuid:8c9b8b45-f8fa-4aef-9b42-dac9849b666b. Original Document ID: xmp.did:24289986-4e07-4942-93b1-62c962ede61b. Document ID: xmp.id:1384baf3-56d2-744a-a4aa-e80e8015732a. Rendition Class: proof:pdf. Derived From Instance ID: xmp.iid:af6147bc-caa3-b749-b9f4-d4c414e92ab7. Derived From Document ID: xmp.did:fd3c6db2-9a83-414b-82a1-ba5ba0c065bf. Derived From Original Document ID: xmp.did:24289986-4e07-4942-93b1-62c962ede61b. Derived From Rendition Class: default. History Action: converted. History Software Agent: Adobe InDesign CC 2015 (Windows). History When: 2015:12:01 11:56:47-05:00. Producer: Adobe PDF Library 15.0. Trapped: False. Page Count: 26. Creator: Adobe InDesign CC 2015 (Windows). Sony news in your inbox. Download our apps.https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1626c3c3e9a68d---cameron-u-bop-manual.pdf Support Support Self Support Contact Support Community Register a Product Sign In Favorites Sony Rewards Electronics Registration Electronics Community Favorites Favorites Search Sony Sony Sites Search Sony To get the full experience on Sony.com, please change your settings to allow JavaScript. The Bluetooth wireless headset will not charge. We recommend downloading and installing the latest version of one of the following browsers: Our site is not optimized for your current browser. A newer version of your browser may be available Chrome Chrome Download the latest version IE Internet Explorer Download the latest version Firefox Firefox Download the latest version Apple Safari Download the latest version Proceed with current browser for now Proceed with current browser for now. Ask your question here. Provide a clear and comprehensive description of the issue and your question. The more detail you provide for your issue and question, the easier it will be for other Bose Noise Cancelling Headphones 700 owners to properly answer your question. Ask a question This manual comes under the category Headphones and has been rated by 1 people with an average of a 6.9. This manual is available in the following languages: English, Chinese. Do you have a question about the Bose Noise Cancelling Headphones 700 or do you need help. Ask your question here Bose Noise Cancelling Headphones 700 specifications Brand When the volume exceeds 120 decibels, direct damage can even occur. The chance of hearing damage depends on the listening frequency and duration.ManualSearcher.com ensures that you will find the manual you are looking for in no time. Our database contains more than 1 million PDF manuals from more than 10,000 brands. Every day we add the latest manuals so that you will always find the product you are looking for. It's very simple: just type the brand name and the type of product in the search bar and you can instantly view the manual of your choice online for free.argo-naut.com/userfiles/files/canon-camera-sd630-manual.pdf ManualSearcher. com If you continue to use this site we will assume that you are happy with it. Read more Ok. Here's my review of the Bose QC35 ii. The redesign does not change much but adds a bit more functionality and a dedicated button for Google Assistant and to switch between noise canceling modes which is a welcomed addition. This is good choise for noise cancelling wireless headphones. You can get the important information of Bose QuietComfort 35 II with its user manual, user guide and instruction manual.Bose QuietComfort 35 II manual available online, you can read PDF user manual for Bose QuietComfort 35 II. They have decent audio reproduction with a. Along with the included wireless subwoofer, its ability to. One of the best parts of using a Bose Headset is the Bluetooth capability. With Bluetooth, you connect a device by pairing it wirelessly with a source; you do not need a cord to make the connection. Pairing connects other Bluetooth devices with your Bose headset, but first, you must turn on pairing mode. Here is how. Manually Turning on Pairing in Your Bose Headset To pair your Bose headset with a Bluetooth-enabled device: Turn the headset upside down so that you are looking at the bottom of the headset. Move the power switch to the On position to turn on the headset. Move the headset close to the Bluetooth-enabled device that you want to pair it with so it can be discovered. The second device must also be powered on. Press and hold the call button (or another button specified in the instructions for your specific device) on your headset for about five seconds to put the headset into discoverable mode. You will see a slow-blinking indicator light. From the second device's Bluetooth device list, choose the option for the name of the Bose device you are pairing. If the device name does not up, go back to the Bose device and repeat the steps to get it to show up.https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1626c3c4a80554---camfrog-user-manual.pdf After you select the device, you may be prompted to enter a password or to confirm to accept the connection. If you are asked for a password, Bose says to type in 0000 and then press OK. When the pairing has completed the connection, the Bluetooth indicator light flashes again and turns a solid color. Ten seconds after the pairing is complete, the light turns off. Turning on Pairing Mode With Bose Connect App In addition to manually pairing your Bose headset with a Bluetooth-enabled device, you can use the Bose Connect app to turn on pairing mode. The Bose app manages the Bluetooth settings for multiple Bose devices. To pair your Bose headset with the Connect App: If you have not already, download the Bose Connect app from the iOS App Store or Google Play. Open the app and go to the Connections section. If this is your first time connecting, click the Connect New option. On your headset, make sure the power light is on and that you held down the Call button to turn on pairing mode. Your device should now show up on the Bose Connect app. Select it by its name. Once the device is connected, the indicator light blinks for two seconds, and the app reports that it is Connected to (Name of the Device). If you need to disconnect your device, you can do so from the app, and if you choose to reconnect it later, locate your device's name in the app under the Connections subcategory History. There, devices that were previously connected are available to reconnect. When Bose Headset Does Not Pair in Connect If your wireless headset does not show up in the Bose Connect app, confirm that the headset is on and try again. If that does not work, reboot the device. You can also try closing and reopening the Connect app, and if you are on Android, enable location services or clear the app's cache to reset the app's settings and, hopefully, fix the problem.https://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1626c3c523dfae---camileo-b10-manual.pdf Bose QuietComfort 35 Not Pairing Certain headsets, such as the QuietComfort 35 wireless headphones, sometimes have issues struggling to connect. If you find your Bose QuietComfort 35 not pairing, clear the Bluetooth list on both your headset and the Bluetooth devices you are trying to connect with. To clear this pairing list, slide the power switch of the headset to the Bluetooth symbol and hold it for 10 seconds. You should hear Bluetooth Device List Cleared. Then, do the same on the Bluetooth connected device and delete the QuietComfort 35 name from the device's Bluetooth list. That should solve any issues of Bose QuietComfort 35 not pairing. Bose SoundLink Speaker Not Pairing While it is not a headset, you might find that your Bose SoundLink speakers have trouble pairing too. If this happens, reset Bose SoundLink and the Bose SoundLink app. To do so: Hold the Mute button down on your SoundLink speakers for 10 seconds until the LED lights flash. Press the Power button to turn the SoundLink back on. Clear the pairing list on both the Bose SoundLink speakers and the Bluetooth device you were trying to connect to. To reset the Bose SoundLink pairing lists, hold down the Bluetooth button for 10 seconds. A tone sounds when it is done, indicating you cleared all Bluetooth devices from the speaker's memory. Try to pair the device again. To make your speakers discoverable, hold down the Bluetooth button for three seconds. This light blinks on and off about once per second, which is how you know that pairing mode is on. Now, connect to the speakers from your Bluetooth-enabled device, and your device should be paired. References Bose: Pairing the Headset With Your Device Bose: My Headphones Will Not Pair With My Bluetooth Device About the Author Grant Harvey is a writer with experience in the tech and crowdfunding space. Appliances All Appliances Large Appliances Small Appliances Vacuum Cleaners More categories. Wirecutter is reader-supported.applestudenttours.com/ckfinder/userfiles/files/canon-camera-sd1200-is-manual.pdf When you buy through links on our site, we may earn an affiliate commission. Learn more Photo: Rozette Rago Electronics Headphones The Best Noise-Cancelling Headphones Updated June 10, 2020 We’ve replaced our top noise-cancelling earbud pick with its successor, the 1More Dual Driver ANC Pro, which offers improved noise cancellation and battery life. Show more We’ve replaced our top noise-cancelling earbud pick with its successor, the 1More Dual Driver ANC Pro, which offers improved noise cancellation and battery life. We’ve also added recently tested models to the Other noise-cancelling headphones we like and Competition sections. Show less Your guides Brent Butterworth Lauren Dragan Share this review For frequent flyers or commuters on public transit, reducing the noise around you is the difference between enduring a trip and enjoying it. Noise-cancelling headphones can make your music easier to hear and your world a little more peaceful. We recommend the over-ear Bose Noise Cancelling Headphones 700 and the in-ear 1More Dual Driver ANC Pro, depending on which headphone style you prefer. Our pick Bose Noise Cancelling Headphones 700 The best over-ear noise-cancelling headphones The Bose 700 headphones deliver excellent noise cancellation in a comfortable, lightweight design that’s traveler friendly—but they carry a high price. These headphones are expensive, but we think they’re worth the investment for the frequent traveler who puts a high premium on performance and comfort. They offer the superior noise cancellation that Bose is known for, plus more adjustability than on any other noise-cancelling headphones we’ve tested. You can adjust the level of the active noise cancellation (ANC) on a scale from 0 to 10, so if you find that intense noise cancellation causes a feeling of pressure or discomfort (what we call “ eardrum suck ”), as we noticed with the Bose QuietComfort 35 Series II —or if you just want a little more sense of your surroundings—you have more flexibility to find a level that works for you. These noise-cancelling headphones also have a lightweight design that is comfortable to wear for hours, and they feature an easy-to-use combination of touch controls and physical buttons that you can access without looking. Plus, you can use them in wired mode with the ANC engaged if, for example, you want to access an in-flight entertainment system. They fold flat for easy storage in the supplied case, too. They aren’t entirely without flaws, however: The sound quality is good but not as crisp as on the best over-ear headphones we’ve tested, the app can be vexing, and the battery life isn’t the longest we’ve seen—though at 20 hours it’ll still get you through a very long flight. Advertisement Our pick 1More Dual Driver ANC Pro The best noise-cancelling earbuds The ideal travel companion, this pair of earbuds offered the best noise reduction in our tests and allows you to listen via Bluetooth or an included cable. These collar-style Bluetooth earbuds (which have a flexible band connecting them) cancel an impressive amount of noise and have enough battery life to last through a long flight and beyond. (1More claims 20 hours with the noise cancelling off and 16 hours with it on, consistent with what we found in our tests.) The quick-charge mode will give you three hours of use after just 10 minutes of plug-in time. These earbuds also function corded—with the active noise cancellation on or off—for those trips when you want to use an in-flight entertainment system. The voice-enhancement mode lets you carry on a conversation by tapping a button to pass the sound through so you don’t have to remove the earbuds. Plus, unlike wireless earbuds that use a hard-plastic collar (such as the Bose QuietControl 30 ), this pair’s flexible collar allows them to coil up small enough to fit into a trouser pocket. The noise cancellation is effective, the sound quality is pretty decent (though a bit bass heavy), and the lightweight chassis and soft foam earcups are comfortable. The 30-hour battery life is impressive for a model in any price range. You can use these headphones in wired mode, and the controls are easy to operate. Budget pick TaoTronics TT-BH042 The best budget noise-cancelling earbuds The wireless TT-BH042 pair offers good sound and okay noise cancelling at an amazingly low price. These earbuds sound quite good, their noise-cancelling performance is at least helpful, their design is practical and comfortable, and they carry an IPX5 moisture-resistance rating. Battery life is middling, around eight hours. The downside is that you can’t use them in wired mode, so you can’t connect this pair to in-flight entertainment systems without some type of adapter. Everything we recommend Our pick Bose Noise Cancelling Headphones 700 The best over-ear noise-cancelling headphones The Bose 700 headphones deliver excellent noise cancellation in a comfortable, lightweight design that’s traveler friendly—but they carry a high price. Other noise-cancelling headphones we like What to look forward to The competition Sources Why you should trust us Wirecutter senior staff writer and headphone reviewer Lauren Dragan researched the models for this article, collected the test samples, and did her own extensive testing of all the headphones we received. Senior staff writer Brent Butterworth also tested all of the finalists and performed the noise-cancelling measurements. Brent has been reviewing audio gear professionally since 1990. Brent is one of the extremely small number of audio journalists (maybe two or three total) who own laboratory-grade headphone test equipment, which he used for part of our testing here. In the past eight years, he has evaluated and measured more than 350 headphones and done more in-depth analysis of noise-cancelling headphones than any other journalist. Who should get these Noise-cancelling headphones are designed to reduce low-pitched humming and droning sounds, which you encounter in an airplane cabin and, to a lesser extent, on buses and trains (and probably on boats, too, although we haven’t tried that). They can also reduce sounds from some machinery, such as loud air conditioners. A decent set of headphones with active noise cancelling (ANC) can make airplane travel much more enjoyable because the feature allows you to hear movies, music, and in-flight entertainment clearly without having to turn the volume way up. You can also use these headphones even when you’re not listening to anything, just to make the cabin noise less annoying; some people use noise-cancelling headphones to help themselves fall asleep on long flights. Noise-cancelling headphones work by using microphones to capture the noise around you and then feed an opposite (or phase-reversed ) version of that sound into the tiny speakers (or drivers ) built into the headphones. The technology never works perfectly, but it can work well enough in certain environments to make listening more enjoyable. The best noise-cancelling headphones combine this “active” noise cancelling with passive noise cancelling—that is, physical barriers and dampers built into the headphones that help block or absorb noise. It’s a popular misconception that ANC headphones cancel out all noises equally. They don’t. If you want to learn more about how ANC works, and what sounds it works on, check out “ What Your Noise-Cancelling Headphones Can and Can’t Do.” The short version: If you travel on airplanes a lot, you’ll benefit from having a set of ANC headphones. If, on the other hand, you just want something that reduces street sounds or the chatter of your office colleagues or fellow Starbucks patrons, conventional headphones will probably do about as good a job as noise-cancelling headphones—and they’ll often cost less. The Best Over-Ear Headphones Whether you’re looking for the best sound or just to cancel out the noise, we’ve picked the best headphones for anyone who wants an immersive experience. The Best Bluetooth Wireless Headphones The Jabra Elite 85h Bluetooth headphones sound great and are a pleasure to wear and use, which is why this pair is our new top pick. We know that the choice between in-ear and over-ear headphones is a personal one, so we’ve included picks for both types of noise-cancelling headphones. Earbuds are more compact and easier to travel with, and they can sound just as good and cancel noise just as well as over-ear and on-ear models. They may also work better if you wear glasses, because a thick set of glasses frames may prevent over-ear and on-ear headphones from making a good seal against your ears and cheeks. The downside is that you have to stick earbuds into your ear canals, which some people find uncomfortable. How we picked The four main things to consider in a set of noise-cancelling headphones are: efficacy of the noise cancelling sound quality battery life (in wireless models) overall comfort Since we first published this guide, we’ve tested more than 100 active-noise-cancelling headphones and considered dozens more. Although we have tested wired-only models in the past, most new noise-cancelling headphones feature Bluetooth wireless technology, which is now available at very affordable prices. However, many of these wireless headphones also support a wired connection, which is important if you want to connect to an in-flight entertainment system or if you want to conserve battery life. We set no lower or upper price limits because this guide covers the entire range of noise-cancelling headphone models. How we tested We measured the noise-cancelling performance of the over-ear headphones using a GRAS 43AG ear-and-cheek simulator. Photo: Brent Butterworth To judge the sound quality, we listened to the headphones with noise cancelling on and off—because some headphones sound great in one mode and not so great in the other. We used the test music of the panelists’ choice, sourced from various smartphones. Testing the noise cancelling was more complicated. We did this both by ear and by using test equipment. To test the noise cancelling by ear, Lauren and John played noise at a loud level through a JBL L16 wireless speaker and then tried each of the headphones to see which ones best cancelled the noise. Brent did his test in his audio lab, using a mix of cabin noise recorded in four different airliners, fed through four speakers and a subwoofer at a level of 80 decibels, which is about the level you’d experience in the fairly loud cabin of an older jet such as a Boeing 737 or a McDonnell Douglas MD-80. Brent followed up by testing the best models during rides on Los Angeles’s Metro transit system, which includes buses and subways. We measured in-ear headphones using a GRAS 43AG ear-and-cheek simulator and KB5000 simulated pinna. Photo: Brent Butterworth Brent then performed lab tests, measuring the degree to which the headphones blocked different frequencies of sound.