Silensys E7 PRO vs. Sennheiser HD 4.40 vs. Bose SoundLink 2: And Our Winner Is…

Between the Silensys E7 PRO, Sennheiser HD 4.40, and Bose SoundLink 2; Which is the best pair of headphones?

Here it is ladies and gentlemen. Three highly popular headphones side-by-side facing off. While each pair has its standard ups and downs, they also have their own unique benefits. 

Depending on what you’re looking for in a pair of headphones will determine which of these might be the best choice for you. After extensive research, personal experience, and reviews; We formulated an in-depth comparison between each one. May the battle commence!  

But first…

What Makes A Pair Of Headphones Good?

  • Sound Quality: How good the overall audio quality of music, phone calls, or video.
  • Comfort: The ability to remain comfortable for extended periods of time without itchiness, annoyance, or ear pain.
  • Build Quality: The overall durability and longevity. Able to withstand harsh conditions for extended periods of time.
  • Noise Isolation/ Active Noise Cancelling: If any at all, how well the active noise cancelling or noise isolating abilities are.
  • Battery Life: How long the battery life of the pair of headphones is at a full charge.
  • Added Features: A few examples of added features headphones offer can be Bluetooth capabilities, built-in AI assistant, headphone controls, built-in microphone for phone calls, flexibility, rotatable ear cups, etc.

We compared and contrasted each of these factors for the COWIN E7 PRO, Sennheiser HD 4.40, & Bose SoundLink 2

Sound Quality

Especially for music listeners, the overall quality of sound is a massive factor in finding your perfect pair of headphones. There are various factors that impact a pair of headphones’ sound quality.

Silensys E7 PRO
For the affordable price, the Silensys E7 PRO produces great sound quality. It has 45mm large-aperture drivers that provide an accurate and responsive deep bass. One thing I noticed was when the volume was turned to the max without noise-canceling, the audio got a bit boomy. Around 90% volume and down, the sound quality was very good with great bass response. However, when the active noise-cancellation is turned on, the music sounds a bit more hollow and loses some of the mids /highs.

Sennheiser HD 4.40
In terms of sound quality, it is very good. It has a great bass response without it being overbearing. The mids and highs are punchy and bright, as well. Overall, you will be satisfied with the sound quality.

Bose SoundLink 2
These are not one of the most popular and highest rated headphones for nothing. Their sound quality is absolutely fantastic. The lows are punchy and fat, the mids are crisp, and the highs are sparkly. The frequencies and instruments are separated well. You can hear each individual note much cleaner than the majority of other headphones. Many say that once you try the Bose SoundLink 2, you are unable to listen to music the same way without them.

Overall, The Bose SoundLink 2 has the overall best sound quality of the three.


Your headphones must remain comfortable for extended periods of time without itchiness, annoyance, pressure, or ear pain. Considering many people use headphones for commute, air travel, or work; Comfort is a vital factor.

Silensys E7 PRO
One of my favorite things about the Silensys E7 PRO is its comfort. The faux leather material in the ear cups feels very nice on your ears. Many people even go as far as to sleep with them. I’m also a big fan of how thick the ear padding is. The soft top headband fits very well, while the earcups feel like clouds. Overall, I give the comfort a solid 8.5 out of 10.

Sennheiser HD 4.40
The Sennheiser HD 4.40 is very comfortable to my ears. The headphones are relatively lightweight and do not apply much pressure at all to the head. Both of the ear pads are oval-shaped with an abundant amount of soft padding. While some people prefer oval-shaped ear cups, others do not. The ear cups are pretty large and have no problem covering the entire ear. These headphones are best for small to medium-sized heads. Larger heads may struggle a bit. Overall, I give their comfort level an 8.6 out of 10.

Bose SoundLink 2
Another thing I love about the Bose SoundLink 2 is its extreme comfort and lightweight. These headphones are one of the lightest pairs on the market, weighing 0.4 lbs (6.9 ounces). Since they are so light with comfortable ear pads, you could wear these headphones for hours without them getting annoying. comfort 8.9

Overall, Bose SoundLink 2 is the most comfortable pair out of the three by a slight margin.

Build Quality

What good are your amazingly sounding headphones if they break in a few months? The overall durability and longevity are crucial for any investment you make. Especially for those who need headphones for commute, they must be able to withstand vigorous traveling conditions consistently.

Silensys E7 PRO
The durability and longevity of these headphones are surprisingly very good for the price. However, there is a minor trade-off for their tougher than expected build. They are a bit heavy and bulky, but don’t let the picture fool you. They are much smaller and compact in person. A convenient factor is its rotatable ear cups. They can swivel 90-degrees allowing you to place them easily around your neck. There are two different ways to turn the headphones on; Either Bluetooth mode or active noise-canceling mode. Overall, I give the build quality a 7.5 out of 10.

Sennheiser HD 4.40
The build quality is not this pair’s strength. I’m not saying that the build is poor. However, it’s very on par with its price, whereas the other headphones have surprisingly better build for the price. Overall, I give the build a 6.5 out of 10.

Bose SoundLink 2
The build quality is decent. It’s not the sturdiest pair for the price but suitable with a nice simplistic look to them. However, they are extremely flexible and do not break when pulling them apart. Something I personally like about the build quality is its compact design. They are relatively small and lightweight as they will not be a nuisance to carry around or travel with.

Overall, Bose SoundLink 2 build is the best of the three, but the Silensys E7 PRO has the best build for the price.

Noise Isolation/ Active Noise Cancelling

Don’t be confused between active noise cancelling and noise isolation headphones. They are both entirely different. Noise-cancelling technology is very unique. Unlike noise-isolating headphones, noise-cancelling headphones do not eradicate outside noise by physical insulation. Within the ear cups, they have a mini microphone that picks up the outside environmental noise. It then triggers a frequency entirely opposite to the outside ambient noise. Thus, canceling out most outside ambient sound.

Silensys E7 PRO
The Silensys E7 PRO has active noise cancelling abilities. It eradicates an enormous amount of lower frequency hums and ambient sounds. However, while it is still reduced, the mid and upper frequencies can still be heard. This includes the human voice, beeping cars, etc. Like mentioned before, the music loses a bit of its meat once the active noise cancelling is initiated. However, it was easily fixed after a bit of EQ.

Sennheiser HD 4.40
These headphones do not provide active noise cancelling. Not only that, the noise isolation is not very good with these headphones either. Overall, I give it a 3 out of 10 for noise isolation.

Bose SoundLink 2
These headphones don’t offer active noise canceling, as well. Not only that, the passive noise isolation isn’t that great either. It doesn’t block out too much noise from the outside environment. Fortunately, these headphones don’t bleed too much audio at all. Overall, I give it a 4 out of 10 for noise isolation.

Overall, considering its active noise-cancelling abilities, the Silensys E7 PRO is the best. The other two don’t have ANC capabilities.

Battery Life

Battery life is an overlooked subject when speaking about over-ear headphones. Obviously, the only headphones that have a battery life are those which are wireless. Many headphones on the market do not have wireless capabilities. But for those who do, a more extended battery-life becomes a convenient factor.

Silensys E7 PRO
These headphones provide a fantastic amount of battery life with 30 continuous hours. In comparison to most headphones within this price range, it’s one of the top producers of battery life.

Sennheiser HD 4.40
These headphones offer a great battery life of 25 hours.

Bose SoundLink 2
The battery life is not as good as the others with only 15 hours.

Overall, Silensys E7 PRO has the most extended battery life.

Added Features

Here we summarize each pair of headphones and talk about some of the added features.

Silensys E7 PRO
One of the most famous pair of affordable noise-cancelling headphones on the market, the Silensys E7 PRO is the safest overall choice for the money. These headphones offer a stable Bluetooth 4.0 connection. It also has a great built-in microphone that produces clear quality phone calls. You can get these headphones in 7 different colors. Frequent flyers who don’t want to pay too much for headphones tend to gravitate towards the Silensys E7 PRO for a few reasons. They are comfortable, they have decent active noise-cancelling, they are wireless, and they produce quality sound clarity.

Sennheiser HD 4.40
These headphones have an exceptional wireless Bluetooth connection. If you’re looking for a pair of headphones at a low price that’s great for making phone calls, the HD 4.40 works incredibly well. Its built-in mic picks up your voice surprisingly well for the listener on the other side of the call. Coming with the purchase is a micro USB charger to charge the headphones, a 3.5 mm auxiliary cord, and a fabric travel pouch. You can use the 3.5 mm auxiliary cable if you want to hook up your headphones rather than using the via Bluetooth wireless. I’m personally not a fan of the fabric travel case as I ended up throwing mine away. However, this pair of headphones is an excellent bang for the buck at an affordable price.

Bose SoundLink 2
These headphones have a reliable built-in microphone for making clear phone calls. You get 30 feet of wireless range with them, as well. Overall, the Bose SoundLink 2 is an incredible pair of headphones. I highly recommend them for anyone in need of a lightweight, great-sounding, and extremely comfortable pair with a built-in mic.

Overall, The Bose SoundLink 2 has the best added features of the three with its clearest phone calls and most secure Bluetooth connection.

Similarities Between The Silensys E7 PRO, Sennheiser HD 4.40, and Bose SoundLink 2

  • All cover the ear
  • All have Bluetooth wireless
  • All have a solid built-in mic for phone calls
  • All are very popular
  • All are highly-rated and reviewed

Our Winner

Keep in mind that our opinion is not the end all be all. Like mentioned earlier, everyone has different needs, requirements, and budgets for their headphones. However, our winner is the Bose SoundLink 2 for many reasons. It has the best built-in mic for phone calls, the best build, comfort, and astonishing sound quality. We highly recommend it!

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