Sennheiser CX 7.00BT In-Ear Wireless Review

Sennheiser CX7.00BT In-Ear Headphone Review

It’s already October and the year is nearing a close but not without a few more headphone surprises from Sennheiser. The latest one is Sennheiser’s second in-ear wireless headphone ever and it’s called the CX 7.00BT. This earphone is priced well at just under $150 and promises slightly different sound and modified features compared to the HD-1 in-ear wireless. I’m about to dig in to one of the first CX.700BT headphones to hit the streets and see what it’s all about.

In The Box

  • CX 7.00BT headphone
  • Charging cable
  • Carry Bag
  • 4 sets of silicone eartips
  • Quick user guide
  • Safety guide
Sennheiser CX 7.00BT Wireless In-Ear - In The Box
Sennheiser CX 7.00BT Wireless In-Ear – In The Box


The CX 7.00BT features Bluetooth v4.1 which supports both aptX and SBC audio codecs.

This headphone also has integrated NFC wireless capability which will allow 2 devices at one time (eg – Phone & PC). That’s a handy feature that can have you at your workspace one minute and out the door in a flash… with constant connection to your headphone.

The Sennheiser CX 7.00BT wireless in-ear headphone also has a fast charge time of only 1.5hrs for up to 10hrs of use.

The integrated controls (3-buttons plus power button) are quite comprehensive giving you remote control Play, Pause, Track Skip, Mute, Voice Dial, Redial and Call Start/Stop.


Connecting the CX 7.00BT is as simple as pressing the Power button and waiting for the flashing blue and red light. Once that’s done just select the (CX 7.00BT) on your mobile device and you’ll hear a lovely British voice tell you “CONNECTED”. From there you have full control of your music and phone calls.

Wireless Range

I tested the wireless range of this headphone and found it went about 25 feet (connected via Bluetooth) before getting any dropouts on my smartphone and about 10 feet using the aptX codec on a Fiio X7 MkII. That’s not too bad for a wireless earphone and most of the time you’ll have your device close by anyway.

Walking around town I got the same results as most Bluetooth earphones. The CX 7.00BT stayed connected 95% of the time with no issues but it did drop out a few times. Overall, it was great.

Different From The HD-1 Wireless In-Ear

Sennhiser’s first wireless in-ear was the Sennheiser HD-1 wireless earphone. Although the look is very similar to the CX 7.00BT I found a few differences. The first difference is you don’t get a hard case with the CX 7.00BT. The second difference is you don’t get the vibration feature in the neckband for smartphone notifications and calls with the CX 7.00BT. The final difference is the HD-1 in-ear wireless has “slightly” more bass like it’s wired predecessor. For many people these are small differences overall but it all depends on what you want in a wireless earphone and what your budget is.


The “neckband” style wireless earphone is a point of contention for some. Critics claim it’s too bulky and defeats the purpose of being wireless. But I say give it a try. It’s honestly not as bad as you’d think and the controls are very easy to use.

The ergonomic earphone housing on the CX 7.00BT reminds me of the Sennheiser CX 3.00 which is a popular wired earphone that has great Hi-Fidelity sound and features no inline controls. They fit nicely in the ear and don’t seem to bother me at all. In fact I could see myself wearing them for hours without a problem.


The Sennheiser CX 7.00Bt claims a frequency range of 17Hz to 21kHz. That’s great for a Bluetooth earphone. To start I listened to a wide range of music from my smartphone including (pop, rock, hip-hop and podcasts). After that I connected to a Fiio X7 to see how the aptX connection sounded.

What I found was controlled and balanced bass equivalent to the Sennhieser CX 3.00. As with most Sennheiser earphones I was equally impressed with the mids and high frequencies. From Geneva Jaccuzi to R.E.M. my streaming music sounded crystal clear and didn’t front with any boomy bass.

Listening via aptX on the Fiio X7 was even better. The clarity was incredible and even the volume sounded a bit louder. Although this headphone is definitely geared for use with smartphones you’ve got the added ability to connect to your computer or Hi-Res player and get really amazing sound.

Final Analysis

The Sennheiser CX 7.00BT is another hit in my book. The neckband is very similar to the HD-1 wireless and the earphones are very reminiscent of the CX 3.00 wired. Combining these two design elements into a wireless in-ear headphone priced at under $150 makes the CX 7.00BT a great product for the price.

This earphone is designed for the frequent traveler or commuter looking for excellent music clarity and access to high quality sounding phone calls at the touch of a button. The CX 7.00BT sounds best with most pop genres and works especially well with electronic and rock music. Overall I give this Sennheiser headphone 4-stars and a MajorHiFi stamp of approval.

Get the best price on the Sennheiser CX 7.00BT Wireless In-Ear Headphone at the following online retailers:

Audio46 Headphone Store: Sennheiser CX 7.00BT Wireless In-Ear Headphone
Amazon: Sennheiser CX 7.00BT Wireless In-Ear Headphone

Sennheiser CX 7.00BT Wireless Earphone with aptX
Sennheiser CX 7.00BT Wireless Earphone with aptX



Frequency response: 17Hz – 21,000Hz
Sound pressure level: (SPL) 112 dB (1 kHz/0 dBFS)
THD, total harmonic distortion: <0.5% (1kHz/100dB SPL)


Pick-up pattern: Omni-directional
Sensitivity as per 121 TR 9-5: – 44 dB V/Pa