Tennmak Crazy Cello In-Ear Headphones Review: All about high-resolution audio

This inexpensive Chinese headset doesn’t seem like much but is geared for high-resolution audio.

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Tennmak Crazy Cello 3 5
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  • The Tennmak Crazy Cello in-ear headphones are priced at Rs 3,745.

  • The headset has a frequency response range of 5-70,000Hz.

  • You don't get a microphone and in-line remote on the headphones.

If there is one consumer electronic product category where there is no shortage of choice, it’s personal audio. The sheer volume of headphones and earphones available in various price categories is baffling to say the least. There are plenty of brands from all over the world present in India, along with affordable, almost disposable options imported by the truckload and sold at prices that are less than what I usually pay for lunch.

In the coming years, we’re likely to see the mid-range space grow considerably, as more users see the sense in investing up to Rs 5,000 on good headphones. And what you choose depends entirely on the kind of features, fit or sound you want. There are various technological aspects that also go into the choice, including the new push towards high-resolution audio.

While the loose interpretation of the term can mean pretty much anything beyond run-of-the-mill radio and MP3 audio, the High-Res Audio consortium considers headphones and speakers that can reproduce sounds from 5-40,000Hz as high-res audio compatible. Today, we’re reviewing a pair of in-ear headphones that touts its frequency range as its USP. The Tennmak Crazy Cello is priced at Rs 3,745 and is marketed as an affordable high-resolution audio compatible headset. We review to find out what it’s about.

Tennmak Crazy Cello Design and Specifications

The Crazy Cello in-ear headphones are, like many other products we’ve seen from small Chinese brands, are fairly ordinary when it comes to design and build. With a metal casing that is solid enough but doesn’t look special in any way, the Tennmak headset has no aesthetic appeal. It isn’t bad, but it isn’t great either. In terms of fit, the silicon ear tips make for a comfortable enough listening experience.

The headset doesn’t have an in-line remote and microphone, and is entirely geared for listening as such. The cable is twisted and wrapped in plastic, which makes it quite tangle-resistant. You also get a carry case with the headset, along with replacement ear tips.

In terms of specifications, the Tennmak Crazy Cello in-ear headphones have 9mm dynamic drivers, an impedance of 28 Ohms, a sensitivity rating of 105dB, and uses the standard 3.5mm plug to connect to a source device. The big differentiator here is the frequency response range – the Tennmak Crazy Cello can reproduce sounds from 5-70,000Hz. Needless to say, it’s an incredibly wide frequency response range, comfortably qualifying for the high-res audio tag.

Tennmak Crazy Cello Performance

Now, it’s important to point out before we get into the details that the human ear can hear sounds in the frequency range of 20-20,000Hz. Most headphones tend to stick to this range, because it exactly covers the entire audible frequency range. While it would seem pointless to go outside this listening range, experts in audio have argued that even though you can’t actually hear outside the range, it is possible to perceive the actual vibrations and benefit from the extended frequency range.

My personal experience with this is that a stretched frequency response range does have some effect on the sound, with everything sounding crisper and more defined. However, this is usually the case with high-end headphones that pack in not only larger drivers, but also in many cases, more capable drivers. A good pair of electrostatic or planar magnetic headphones will be able to do more with an extended frequency range than a simple dynamic pair. This is unfortunately the case with the Tennmak Crazy Cello; the driver simply doesn’t have the capability to properly make use of the extended frequency range.

For my review, I stuck exclusively to high-resolution audio files routed through my OnePlus 5T, which were primarily FLAC and WAV format tracks. Listening to Pharrell Williams’ Gust of Wind, the first thing I noticed is that the sound is rather, well, ordinary. The expected tonal definition and crisp sound was entirely missing, and it’s at this point that I realized that a wide frequency range means nothing when the drivers can’t do justice to it.

Coming to the specifics of the sound, the sonic signature is a typical V-shaped one, giving that slight boost to the low and high ends. The excellent violin riffs in the track made for plenty of scope to show off frequency range, but alas, the Tennmak comes across as rather ordinary in this case. It’s a sound that is typically found on headphones priced at around Rs 1,500 to Rs 2,000, so the premium for the extended range seems to go to waste here.


The Tennmak Crazy Cello in-ear headset may have a rather odd name, but unfortunately that’s where the excitement ends. As such, it’s an ordinary pair of in-ear headphones that only occasionally shows signs of its wide frequency range and high-resolution audio credentials. To be clear, it isn’t a bad pair of in-ears at all; it’s just far too ordinary to really make an impact, especially considering the price of the headphones. However, if you do want to give high-resolution audio and an incredibly wide frequency range a shot, the Tennmak Crazy Cello is available to buy through Indian audio distributor Hifinage.

  • Published Date: March 6, 2018 9:23 AM IST