A breakdown of the review per specifications

Weight

Sony WH CH520 147g

Sennheiser HD 660S2 260g

The Sony WH CH520 have a weight of 147g, these weigh below 320g, which we consider as the highest average a headphone should weigh for comfort during long use. We consider a lower weight best for the reason that lighter devices are more comfortable to carry.

The Sennheiser HD 660S2, at 260g weigh more than the Sony WH CH520 with a difference 113g

Has A Detachable Cable

Sony WH CH520 ✗

Sennheiser HD 660S2 ✓

Detachable cables are cables that have connectors on both ends. One end goes into your headphone cups, while the other end is inserted into an audio source. Some new headphones, and not just the expensive ones, are coming with detachable cables, Sennheiser HD 660S2 are one of those.

Has A Tangle Free Cable

Sony WH CH520 ✓

Sennheiser HD 660S2 ✓

Twisted headphone cables can be a great source of annoyance and inconvenience, Sony WH CH520's cable is designed to minimize tangling. Constant twisting of the cables can also lead to microfractures in the copper wires, affecting sound quality, or completely damaging your headphones.

Sennheiser HD 660S2 too have a cable designed to help prevent tangles.

Has An Open-Back Design

Sony WH CH520 ✗

Sennheiser HD 660S2 ✓

Headphones that are designed to allow air to pass through their ear cups from the rear of the speaker driver unit are known as open-back. This design provides a very natural and accurate sound, Sennheiser HD 660S2 have this kind of design which means that resonances and low-frequency that tend to build up caused by the rear enclosure are no longer a concern.

Sweat Resistance

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

By sweat resistance we mean that the wireless earbuds are protected in the presence of low-pressure water jets at any angle, this is determined by the IP Rating of the earbuds. Based on the ingress protection rating of the Sony WH CH520 they do have sweat resistance

Cable Length

Sony WH CH520 ✗

Sennheiser HD 660S2 1.8meters

A long cable ensures more freedom of movement, but remember that every cable based on the conducting material used has a certain amount of parasitic resistance, inductance, and capacitance. How much depends on the length and construction. Sennheiser HD 660S2 comes with a 1.8meters cable.

Has An Over-The-Ear Foam

Sony WH CH520 ✗

Sennheiser HD 660S2 ✓

Over-ear headphones have larger earpads that fit around your entire ear Sennheiser HD 660S2 have a comfortable full-size form with earcups that fully enclose your ears. This design is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors.

Has An On-Ear Foam

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

On-ear headphones have smaller earpads that sit on top of your ears, this Sony WH CH520 comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.

Has Stereo Speakers

Sony WH CH520 ✓

Sennheiser HD 660S2 ✓

Sony WH CH520 have stereo speakers, devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better listening experience.

The Sennheiser HD 660S2 also have stereo speakers

Sony WH CH520
See price on Amazon

Has Passive Noise Reduction

Sony WH CH520 ✓

Sennheiser HD 660S2 ✓

Passive Noise Cancellation uses well-designed ear cups to seal out environment noise. This is used for both in-ear earphones and over-ear headphones where the headphone itself will keep surrounding noise out. The Sony WH CH520 sits tightly in place, creating an acoustic seal that reduces background noise and prevents your music from leaking out.

Both of these devices have passive noise reduction which means that also the Sennheiser HD 660S2 isolates you from ambient noise instead of actively using technology to cancel it out.

Lowest Frequency

Sony WH CH520 20Hz

Sennheiser HD 660S2 8Hz

Low-frequency response measures if and how well an audio component reproduces low audible frequencies and if it makes any changes to the signal while at it. Sony WH CH520's lowest frequency is at 20Hz, the lower the low-frequency response, the stronger and juicier the bass.

Sennheiser HD 660S2's lowest frequency is at 8Hz, this implies that Sony WH CH520 got a juicier bass than the Sennheiser HD 660S2

Highest Frequency

Sony WH CH520 20000Hz

Sennheiser HD 660S2 41500Hz

High frequency response measures if and how well a particular audio device reproduces high audible frequencies and if it changes to the signal while at it. Sony WH CH520's highest frequency is at 20000Hz, the higher the high-frequency response, the clearer and crispier the treble.

Sennheiser HD 660S2's highest frequency is at 41500Hz, this implies that Sennheiser HD 660S2 got a clearer and crispier treble than the Sony WH CH520

Sound Pressure Level

Sony WH CH520 ✗

Sennheiser HD 660S2 104dB/mW

Sound pressure is the average variation in atmospheric pressure caused by the sound, the sound level .i.e how loud something is can be perceived differently by different people so we need to have a way of getting an objective measurement of sound level expressed in numerical terms.

The sound pressure level, SPL, is the pressure level of a sound, measured in decibels, dB, Sennheiser HD 660S2's measurement is 104dB/mW. Devices with a higher sound pressure level are generally louder when supplied with any given audio source.

Driver Unit Size

Sony WH CH520 ✗

Sennheiser HD 660S2 38mm

The driver unit is basically a mini speaker that produces sound in the device, its size dictates the loudness of the headphone. Sennheiser HD 660S2 driver unit is 38mm in diameter, bigger drivers are more powerful and can produce better bass.

Impedance

Sony WH CH520 ✗

Sennheiser HD 660S2 300Ohms

Impedance is the device's resistance to the electromagnetic current, as electricity flows through a conductor, it experiences electrical resistance that counters the flow of current. The resistance of a conductor is measured in ohms. Sennheiser HD 660S2's impedance is 300Ohms, the lower the impedance, the easier it is to get higher volume and requires less power.

A Review By Comparison Of The Edifier W820Bt Vs. Sony Wh Ch520

Battery Life

Sony WH CH520 40hours

Sennheiser HD 660S2 ✗

If your headphones play wirelessly, cancel ambient noise, or enhance your listening experience with active features, their battery life will reduce over time. The device's battery life is given by the manufacturer, with longer battery life, you get to use it for longer and have to charge the device less often. Sony WH CH520's battery life is 40 hours

Charge Time

Sony WH CH520 3hours

Sennheiser HD 660S2 ✗

It takes 3 hours to fully charge the Sony WH CH520's battery. It is recommended to fully charge the battery before using the headphones for the first time or when they have been unused for extended periods.

Has A Rechargeable Battery

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

A rechargeable battery is a type of electrical battery that can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use. Sony WH CH520's battery can be recharged and used over again.

Sony WH CH520
See price on Amazon

Can Be Used Wirelessly

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

Sony WH CH520 can be used wirelessly, wireless devices allow users more freedom of movement.

Bluetooth Version

Sony WH CH520 v5.2

Sennheiser HD 660S2 ✗

Bluetooth is a wireless technology standard that allows data transfers between devices placed in close proximity, using short-wavelength, ultra-high frequency radio waves. Sony WH CH520 has a v5.2

Has Usb Type-C

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

Sony WH CH520 support USB TYPE-C, an industry-standard connector for transmitting both data and power on a single cable. The USB-C plug is now part and parcel of most current laptops, phones, and tablets, it features reversible plug orientation and cable direction.

Has Aac

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

Sony WH CH520 support AAC, a codec that is used for Bluetooth audio. It supports 24-bit audio at 250kbps. Because it uses psychoacoustic modeling, it can provide better results than other codecs at a similar bit rate.

Maximum Bluetooth Range

Sony WH CH520 10meters

Sennheiser HD 660S2 ✗

Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances. The Sony WH CH520 can connect at a 10meters distance via Bluetooth or infrared to another device.

Has A 3.5Mm Male Connector

Sony WH CH520 ✗

Sennheiser HD 660S2 ✓

Being an industry standard audio plug, a standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards. This means that it is commonly used in stereo headphones to your phone or connecting your phone to an external amplifier, sound bars, your car radio, etc. Sennheiser HD 660S2 has this connector giving it a wider range of connectivity with most of the sound devices out there. All plugs have at least a tip and sleeve with the number of rings that stand as a differentiating factor.

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Number Of Microphones

Sony WH CH520 1only

Sennheiser HD 660S2 ✗

Sony WH CH520 have only 1 microphones, more microphones result in better sound quality and enable the device to filter out background noise.

Sony WH CH520
See price on Amazon

Multipoint Count

Sony WH CH520 2only

Sennheiser HD 660S2 ✗

Sony WH CH520 support multipoint, which allows you to link to more Bluetooth devices and switch between them. For example, you can easily switch calls from one device to another without having to manually disconnect and reconnect.

Control Panel Placed On A Device

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

There is a control panel on the Sony WH CH520 body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.

Can Be Used As A Headset

Sony WH CH520 ✓

Sennheiser HD 660S2 ✗

Sony WH CH520 can be used as a headset. A headset is one headphone or pair with a built-in microphone. Headsets can be used for apps that require communication i.e. Zoom, Google Meet, Skype, games with voice chat, mobile phones, etc.

Travel Bag Is Included

Sony WH CH520 ✗

Sennheiser HD 660S2 ✓

Carrying headphones without a case, or putting them in bags without a casing can easily put them at risk of getting damaged. The Sennheiser HD 660S2 come with their own special case or pouch, which is useful for safe transportation.

A Review By Comparison Of The Edifier W820Bt Vs. Sony Wh Ch520

Category	Features	Sony WH CH520	Sennheiser HD 660S2
DESIGN	weight	147g	260g
	has a detachable cable	✗	✓
	has a tangle free cable	✓	✓
	has an open-back design	✗	✓
	sweat resistance	✓	✗
	cable length	✗	1.8meters
	has an over-the-ear foam	✗	✓
	has an on-ear foam	✓	✗
	has stereo speakers	✓	✓
SOUND QUALITY	has passive noise reduction	✓	✓
	lowest frequency	20Hz	8Hz
	highest frequency	20000Hz	41500Hz
	sound pressure level	✗	104dB/mW
	driver unit size	✗	38mm
	impedance	✗	300Ohms
POWER	battery life	40hours	✗
	charge time	3hours	✗
	has a rechargeable battery	✓	✗
CONNECTIVITY	can be used wirelessly	✓	✗
	bluetooth version	v5.2	✗
	has usb type-c	✓	✗
	has aac	✓	✗
	maximum bluetooth range	10meters	✗
	has a 3.5mm male connector	✗	✓
MICROPHONE	number of microphones	1only	✗
EXTRAS	multipoint count	2only	✗
	control panel placed on a device	✓	✗
	can be used as a headset	✓	✗
	travel bag is included	✗	✓
		See price on Amazon	See price on Amazon

A Review By Comparison of the Sony Wh Ch520 Vs. Sennheiser Hd 660S2

Reasons why you might like the Sony WH CH520

Reasons why you might like the Sennheiser HD 660S2

A summary of the review by comparison

A breakdown of the review per specifications

Design

Weight

Has A Detachable Cable

Has A Tangle Free Cable

Has An Open-Back Design

Sweat Resistance

Cable Length

Has An Over-The-Ear Foam

Has An On-Ear Foam

Has Stereo Speakers

Sound Quality

Has Passive Noise Reduction

Lowest Frequency

Highest Frequency

Sound Pressure Level

Driver Unit Size

Impedance

Power

Battery Life

Charge Time

Has A Rechargeable Battery

Connectivity

Can Be Used Wirelessly

Bluetooth Version

Has Usb Type-C

Has Aac

Maximum Bluetooth Range

Has A 3.5Mm Male Connector

Microphone

Number Of Microphones

Extras

Multipoint Count

Control Panel Placed On A Device

Can Be Used As A Headset

Travel Bag Is Included

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