by Crutchfield's Dave Bar

Travel in style with these compact, high-quality headphones

iPhone users get extra-convenient operation. An in-line microphone and remote let you make and receive calls, as well as control basic music playback without even touching your phone. And these headphones are compatible with your iPod® or iPad®, too. Plus, AKG includes two detachable cords — one with the in-line remote/microphone, and a standard headphone cable. Each is designed to be tangle-resistant for fewer hassles on the go.

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Travel in style with these compact, high-quality headphones

A compact, folding design makes the K 451s easy to take along everywhere.

Take AKG's compact K 451 portable headphones with you everywhere to enjoy your music to the fullest, and manage your phone calls with hands-free ease. They deliver the top-to-bottom clarity and accuracy that music lovers demand. Soft, comfortable ear pads team up with the K451's closed-back, lightweight design to block out most ambient noise for undistracted listening. An innovative folding mechanism allows these 'phones to collapse down to a super-compact size for easy carrying inside the included protective case.

The in-line microphone and remote let you easily answer calls on your iPhone and adjust the volume.

Switch between calls and music on your iPhone®

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Product highlights:

lightweight, on-ear earcups with padded headband
compact, portable design with 3D-Axis2 folding mechanism for easy storage and portability
closed-back earcup design helps attenuate outside noise
in-line microphone and remote control for iPhone® iPod®, and iPad®
frequency range: 11-29,500 Hz
impedance: 32 ohms
50" detachable single-sided headphone cord with in-line remote/mic and stereo mini plug
51" detachable standard headphone cord with stereo mini plug
carrying case included
weight: 4.2 oz.
warranty: 2 years
MFR # K451 BLK

What's in the box:

AKG K 451 owner's manual

On-ear headphones
50" Headphone cable with in-line remote/mic (terminated by a male 2.5mm connector on one end and a male 3.5mm connector on other end)
51" Headphone cable (terminated by a male 2.5mm connector on one end and a male 3.5mm connector on other end)
1/4" adapter
Carrying case
In-Line Remote Control Diagram
"Attention!" booklet
Warranty Card

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Researched by Crutchfield's Mark G.

Features & specs

General
Fit Style	On-ear
Earcup Type	Closed
Earcup Width x Height	2.3125 x 2.3125
Noise-canceling	No
Bluetooth	No
Bluetooth Version	---
Single-earbud Operation	---
Mic For Taking Calls	Yes
Voice Assistant Access
Amazon Alexa	No
Google Assistant	No
Siri	No
Connectors
3.5mm	No
1/4"	Yes
Lightning	No
4.4mm balanced	No
XLR4 balanced	No
2.5mm	No
Other	None
Specs
Frequency Response	11-29.5k Hz
Sensitivity	126 dB
Impedance	32 Ohms
Weight	4.2 ounces
Cord Length	50"
Parts Warranty	2 Years
Labor Warranty	2 Years

Product Research

Features

Closed-Back Design: The K451 on-ear headphones feature a closed-back design that naturally attenuates ambient noise for a more relaxed listening experience.

Comfortable Fit: The AKG on-ear headphones feature a lightweight design, leatherette padded ear-cups, and adjustable headband to provide a comfortable fit.

3-Button Remote Control + Mic: The AKG K451 features a 3-button remote & microphone (on headphone cable) so you can use your iPod, iPhone, or iPad on the go with in-line controls. The integrated remote lets you initiate play/pause, change tracks, adjust volume, or take a call (iPhone only) without ever touching your player. The built-in microphone supports both voice control (for iPod/iPhone/iPad) and hands-free communication (iPhone only). The K451 is "Made for iPod/iPhone/iPad" compatible and supports the following models and functions (as of 8/15/2012).

iPod Model	Generation	Tested Version	Audio Output		Integrated Remote		Built-in Mic
iPod Model	Generation	Tested Version	3.5mm Connector	Audio Playback	Playback Controls	Answer/End Call	Voice Control	Hands-Free Communication
Shuffle	1st	n/a	Y	Y	N	N	N	N
	2nd	n/a	Y	Y	N	N	N	N
	3rd	n/a	Y	Y	Y	N	N	N
	4th	n/a	Y	Y	Y	N	N	N
dock connector	3rd	2.0.2	Y	Y	N	N	N	N
clickwheel color	4th	3.1.1	Y	Y	N	N	N	N
mini	1st	1.4.1	Y	Y	N	N	N	N
mini	2nd	1.4.1	Y	Y	N	N	N	N
video	5th	1.3	Y	Y	N	N	N	N
classic	80GB	1.1.2	Y	Y	N	N	N	N
	120GB	2.0.1	Y	Y	Y	N	Y	N
	160GB	2.0.4	Y	Y	Y	N	Y	N
nano	1st	1.3.1	Y	Y	N	N	N	N
	2nd	1.1.3	Y	Y	N	N	N	N
	3rd	1.1.3	Y	Y	N	N	N	N
	4th	1.0.4	Y	Y	Y	N	Y	N
	5th	1.0.2	Y	Y	Y	N	Y	N
	6th	1.1 PC	Y	Y	Y	N	Y	N
touch	1st	2.2.1	Y	Y	N	N	N	N
	2nd	4.2.1	Y	Y	Y	N	Y	N
	3rd	5.1.1	Y	Y	Y	N	Y	N
	4th	5.1.1	Y	Y	Y	N	Y	N
iPhone	2G	3.1.3	Y	Y	N	N	N	N
	3G	4.2.1	Y	Y	N	N	N	N
	3GS	4.3.5	Y	Y	Y	Y	Y	Y
	4	5.1.1	Y	Y	Y	Y	Y	Y
	4S	5.1.1	Y	Y	Y	Y	Y	Y
iPhone	1	5.1.1	Y	Y	Y	N	Y	N
iPhone	2	5.1.1	Y	Y	Y	N	Y	N

Note: Apple iPod/iPhone software updates may change functionality results. If you download a newer software version, you may need to reset your iPod/iPhone to regain functionality. If this doesn't work, you may need to wait until a newer software update is available.

Headphone Cable: The AKG K451 utilizes a detachable single-sided 99.99% oxygen-free cable (OFC) terminated by a gold-plated 3.5mm connector for maximum signal transfer and sound quality. A 1/4" adapter is also included.

3D-Axis Folding Design: The AKG on-ear headphones feature a unique 3D-Axis folding mechanism for ease of handling, storing, and transporting.

Storage Case: The K451 on-ear headphones comes supplied with a carrying case that features polyester construction and a zippered closure to protect the headphones during transport or storage.

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