ddHiFi TC35 Pro Eye Mountain Tetris Review

ddHifi TC35 Pro Eye Tetris Mountain

In this review, we take a look at 3 new TC35 DAC/AMPs: the ddHifi TC35 Pro Eye, Mountain and Tetris. Available for $94,99 USD.


Disclaimer: the ddHiFi units were sent to us free of charge by ddHifi in exchange for our honest opinion. 

About ddHiFi

Established in 2017, ddHiFi is a new brand of adapters, DAC, and more recently, earphones. Led by Demond Ding, a former member of FiiO and Oppo, the brand has gained some fame recently, and I was pretty curious to try their products.


The company goal?

“To use concise and brief design language to make user-friendly accessory products, abandon any decorative design that is irrelevant to practical usage and pay more attention to product material and craftsmanship details with cost-controlled”

Or in simple terms: good products at an affordable price. Which is often equal to Chi-Fi if you want to shorten it even more.

We have reviewed many of ddHifi’s USB units before. You can find them all here. The previous TC35 review can be found here: https://www.headfonia.com/ddhifi-tc35i-tc35b-review/

Today I’m reviewing three of their newest and coolest looking DAC/AMP units of the ddHifi TC35 Pro model: the Eye, Mountain and Tetris.

ddHifi TC35 Pro Eye Tetris Mountain

Delivery, Design & Build Quality


ddHifi has released these 3 new units all at the same time, the difference being the form factor and the “using method”, how ddHifi calls it. We will go over all 3 models in this article.

The ddHifi TC35 Pro Tetris, Eye and Mountain all use the same DAC chip from ESS, the ES9281AC. I pretty sure that we haven’t reviewed this chip before, so that’s quite refreshing. You can find out all about this chip, right here: https://www.esstech.com/wp-content/uploads/2021/04/ES9281A_80A_PRO-Product-Brief-v0.2.5.pdf


ddHifi stopped using the nice wooden boxes of their early days, and now they’re using small card wood boxes. On the inside you next to your unit (packed in a small plastic bag) you will find a card with info on the warranty, a bag of desiccant gel, filling and a card explaining the TC35 models specs (with the color codes for the LED)

It’s simple but it works well and at these awesome prices, we can’t expect too much either.

ddHifi TC35 Pro Eye Tetris Mountain

Size & Design

Size and design wise we this time get 3 completely different models, all selling at the same price: $94,99 USD. Why 3 different designs? Easy, according to ddHifi they all 3 have different use cases.

ddHifi TC 35 Pro Eye: Based on the TC44B design, but a whole lot smaller. It’s small, thin and light and it has a non-detachable cable terminated in USB-C to connect it to your source of choice. ddHifi made the body into a waisted arc edge in order to reduce the weight. It also looks like an eye with the 3.5mm connector right in the middle. Eye weighs 8g and measures 28 x 22 x 8mm.


ddHifi TC35 Pro Eye Tetris Mountain

ddHifi TC 35 Pro Mountain: Also small with a slick T-design. It’s smooth, it’s sexy and it has the ddHifi house design all over it. This time the shell is thinner. Mountain weighs 5.8g and measures 30 x 14,8 x 7 mm. The cable length is 6cm.


ddHifi TC35 Pro Eye Tetris Mountain

ddHifi TC 35 Pro Tetris: Perhaps the coolest looking unit, with a 90° angled design. It’s pretty obvious where the name comes from as we all know the game. Absolutely adorable and ddHifi even calls it a piece of art. It’s made from 6063 aviation aluminum alloy and you need to hook it up by using a USB-C cable. Tetris weighs 8g and measures 28 x 28 x 8mm.


ddHifi TC35 Pro Eye Tetris Mountain

All of the units have a tiny indicator light incorporated in their design. In addition to it displaying the on/Off status it also identifies the different sample rates as you can see explained in the image below:

ddHifi TC35 Pro Eye Mountain Tetris (1)

Build Quality

All of the units have very good finishing and the units feel solid. I do have to note that I on the Mountain unit see some glue residue around the USB-C connector. But all-in-all, I really couldn’t ask for more.

Usage and Specifications

All ddHifi TC35 Pro units support remote control and microphone for CTIA standard earphones. The units al share the same specs as the same chip is being used in all three units.

Usage-wise these are very simple, it’s plug and play. For Tetris, make sure you’re using an OTG cable that works. This sounds weird but not all of my OTG USB-C to USB-C cables work with the Tetris. Also plug in your ear/headphone using the 3.5mm socket before you connect the USB-C connector to your source.

Using these on the go is awesome as they only take up little space. Their size however is the biggest disadvantage of the TC35 Pro as well, especially for the Titan and Tetris. They’re so small that they’re easy to lose when you’re out. I never just put them in my pockets, but I use a Pelican hard case to store them in when they’re not being used.


Output Power 1: ≥30mW(16Ω)

Output Power 2: ≥62mW(32Ω)

Output Power 3: ≥7mW(600Ω)

SNR: -118dB

THD+N: 0.0004%

DAC (DSD): Native DSD512

DAC (PCM): Up to 32bit/768kHz

The three devices also are MQA enabled renderers. You either like that or you don’t but they will complete the final unfold of an MQA file and the LED will glow Magenta to indicate that the unit is rendering an MQA stream/file.

The units also automatically detect the ear/headphone’s impedance and they switch between low and high gain modes. Pretty cool!

The part on sound starts on the second page. Click here or use the jumps below.

Page 1: ddHifi + TC35 Pro

Page 2: Sound + Conclusion

4.1/5 - (92 votes)

Lieven is living in Europe and he's the leader of the gang. He's running Headfonia as a side project next to his full time day job in Digital Marketing & Consultancy. He's a big fan of tube amps and custom inear monitors and has published hundreds of product reviews over the years.


  • Reply June 25, 2022


    Well yes it is all well and good talking up the sound of these USB C DAC dongles but how durable is it???
    I haven’t known many of these to make it past 6 months much less a year before they fall apart, stop working or have some other issue.
    I am sure it does sound as good as you say but ultimately I am guessing these will turn out to be a waste of money like all the others on the market when they stop working shortly after purchasing one.
    To be fair I don’t think anyone has perfected the durability aspect with these yet, and yes I am sure some folk will fare better than others in terms of life span use. But again I read too many reviews from people reporting early failures during even limited use.
    Nor is there presently anyone out there with a consumer reputation for robustness in regard to these DAC’s, it seems (though do please let me know if there is one)
    So it really is to hit and miss as to you how long ones USB C DAC dongle will last. As I say there are just too many misses than hits from what I see from customer reviews and the ones giving them high ratings seem do so within a few months of having them so a bit premature in the praise as their failure will likely be imminent
    DD ddHiFi adapters also have reports for poor build quality, like all the other makes out there but hey ho you never know maybe these ones are actually better assembled and not held together with adhesive that melts under heat resulting on the thing falling to bits.
    Oh and not to mention had two myself fail early both within 4-5 months with no method of recompense

  • Reply February 17, 2023


    Have you found any for the iPhone that last and sound good?

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