Michael  |  June 19, 2020

The Hidizs MS1-Rainbow is a single 10.2mm polymer bio-diaphragm driver universal IEM with an external multicolored high-density resin and aluminum design. It is priced at $65 but currently on offer at $54.60.

Disclaimer: The Hidizs MS1-Rainbow sent to us is a sample in exchange for our honest opinion. We thank the team at Hidizs for giving us this opportunity.

To read more about Hidizs products we reviewed on Headfonics click here.

Note, this review follows our new scoring guidelines for 2020 which you can read up on here.

Another month, another Hidizs IEM to review and I couldn’t be happier. The life of an audiophile is a good one, at least…for my ear’s sake. Today, we will be taking a gander at the MS1-Rainbow.

At such a budget-friendly price of only $65, I am extremely excited to “hear” what this little guy has to offer amid the chaos and froth of incredible budget-oriented headphones in the market today!

Note: this model comes in a variety of colors: Black, Red, Blue, Purple, Yellow, Pink, and Transparent Red. I had no clue which I was going to receive for the review, but I am fond of Purple and wish I had that one, hah!

Packaging & Accessories
A standard cardboard box with some design on the top. Inside, a set of light and dark IEM tips to choose from. I’ve found each of them to sound great and each offers a slightly varied sound result.

I’ll be using the tips highlighted in the image below which fit my ear best. No case included. To be honest, as I always say with budget-tier stuff like this, I don’t care for a lot of accessories and I actually don’t want them included. Keep the price down, that is the aim of the product.

It is nice to have a spare little case, but truly? We are audiophiles and likely have a bunch of them already. The general consumer might want more things included though, but at this price, the package is fairly standard and that is just fine.

Stock Cable
Hidizs says the cable is a 4 core “high purity” Silver OFC, with a dreaded inline microphone. I am going to be honest, I strongly dislike being stuck with this cable’s microphone and three-pole.

Thankfully, the design is swap-friendly and I have a ton of backup 2 pin cables I can use. I’m sorry, I personally never use the microphone functions and I feel that a standard cable should be included if there the stock cable had a microphone designed into it.

This is a personal opinion, I know a lot of audiophiles who want this, but I am not one of them. I swapped out immediately for a replacement cable that doesn’t have this for the duration of the review, which is because I dislike the mic swinging around and I don’t want it to interfere with the sound checks I perform often when I am in motion.

The stock cable is really nice though, which makes me sad that it had said mic implemented into it.

MS1-Rainbow Sound Impressions
Yay! Another IEM in the budget tier that remembered not everyone is a critical listener! This IEM is quite musical to me and responds nicely to the bass boost.

The stock experience, with no DSP or EQ active, is one that I find on the low end of moderate in quantity for bass provided. With regard to stock bass, the tonality and density factors are very good. To me, that means the headphone does not sound thin or lacking substance.

What is there, is a bit thick feeling in a good way and not lacking a sense of heft that most budget-tier IEM’s tend to house. Side by side with the Starfield IEM, this MS1-Rainbow feels much denser and deep-reaching. However, noticeably less clean than the Starfield as well. Pick your poison, both are lovely. One is very musical and “fun”, the other is more analytical.

Response to EQ (low end)
I often roll with a +5dB when I use anything via my computer or my Hidizs AP80 portable music player. I love my bass, but I always make sure to disable that when testing and reviewing.

When it comes time for the enjoyment factor, I bass boost because I want more than a flat experience. I like rumble and depth and this MS1-Rainbow is capable of very engaging low-end experiences if you set the EQ system up properly.

Avoid the upper bass dials and stick to the absolutely last few lowest end dials you have available in your EQ system or DSP function. The reason for that is that I found the lower midrange to have some issues, so try not to nuke that area with overly saturated “upper end of the bass EQ range”.

Well, swapping from a few other great IEM’s in this field to this MS1-Rainbow resulted in an odd experience in the lower midrange areas. I would call it a bit of a reverse nasal experience, almost too bloomed and engaging.

I was unable to fix it with Foobar2000 or my MSEB system inside of the Hidizs AP80. Very nice sounding and vocalist inspired headphones, such as my ATH ESW11LTD, make amps with this effect not really pose much of a problem. However, the MS1-Rainbow seems a little problematic in the lower midrange, as mentioned.

It is in the deeper, thicker parts near the bass experience and it really isn’t terrible or anything, just noticeable. In Rock, for example, this isn’t a problem. In slow-paced Jazz, it is. And oddly, that genre is where I think the strength laid most intensely!

This is a great IEM for slow and relaxing sounding music, but I would maybe avoid the Jazz standards and stick to instrumentals with fewer vocal experiences if this is a problem for you. Again, it isn’t at all serious for this price tier.

Despite the offering of the IEM being upward of 40kHz in response, usually denoting excellent treble response and quantity (most of the time), I’ve found this MS1-Rainbow to be quite relaxed and enjoyable up top.

Fidelity is very good, no doubt. For the price, I am so amazed at the current market and what they’ve been able to implement into the sub $100USD category over the last two years.

Dipping backward to some IEM’s from a decade ago in this price range was a really bad idea for me as a reviewer, due to the fact that this MS1-Rainbow and the likes of the Shuoer Tape, Starfield and the Fiio FH1S being absurd values and products that really pushed the limits of what is possible.

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