Tin HiFi T4 Plus Review

Bedrock Reviews
Published in
6 min readFeb 18



The TinHiFi T4 Plus is an in-ear monitor (IEM) featuring one 10mm carbon nanotube dynamic driver per housing. The T4 Plus retails for $119.99. I am not receiving any compensation, financial or otherwise, for writing this review.


I have used the TinHiFi T4 Plus with the following sources:

  • Qudelix 5K
  • Truthear Shio


I tested these headphones with local FLAC and Spotify Premium. Visit my last.fm page to get an idea of what I listen to:

XenosBroodLord’s Library | Last.fm


The TinHiFi T4 Plus comes in a square black cardboard box with a black slipcover. The slipcover displays an image of a satellite that resembles TinHiFi’s iconic tube-shaped IEM design. I’m grateful for the refreshing change from the now-commonly featured anime waifu illustrations on IEM packaging. The rear face of the slipcover features several scannable Quick-Response (QR) codes that link to TinHiFi’s social media profiles.

The IEMs are securely held in place under the box lid, via a white foam mounting sheet. The T4 Plus comes with nine pairs of eartips — three each of generic silicone eartips with black and red cores (in sizes S, M, and L), as well as three pairs of Symbio-like hybrid silicone-foam eartips (also in sizes S, M, and L). The hybrid eartips come packaged in a sturdy, transparent plastic container, whereas the generic eartips come in a clear plastic bag. The T4 Plus comes with a card with quick response (QR) codes that link to TinHiFi’s Twitter and Facebook pages, as well as a user manual written in both Chinese and English. The T4 also includes a semi-rigid pleather carry case with a magnetic closure.


The TinHiFi T4 Plus largely resembles the iconic TinHiFi T2. The IEM is composed of a three-part polished copper assembly, featuring a circular faceplate with a faux-wood grain finish. At the base of the nozzle and the middle housing section, where the two housing sections meet, there are small ventilation holes. The nozzles are equipped with perforated metal covers and robust lips that ensure a secure fit for eartips. The 2-pin ports are fitted flush into a circular base that matches the diameter of the pin connector base on the cable side. This base is marked with a dab of blue paint to indicate polarity. The base of the right-hand side IEM connector and the base of the 2-pin connector of the corresponding cable are red plastic. The corresponding left-hand side bases are composed of clear resin. The housings otherwise lack directional indicators. In fact, the housings lack any branding or text whatsoever.

The only TinHiFi branding on the T4 Plus is found on the metal chin-adjustment choker on the cable, which bears TinHiFi’s logo. I appreciate this subtle approach to branding. I’m always impressed with the aesthetics and quality of the stock cables TinHiFi includes with IEMs at this price point, and this cable is no exception. It uses a quad-braid below the Y-split and double-helix patterns above the Y-split. The metal 3.5mm jack hardware, Y-split hardware, chin-adjustment choker, and 2-pin housings are all similar in appearance to the coppery alloy used for the IEM shells. The jack and Y-Split hardware feature an intriguing fluted pattern engraved onto them. There is strain relief above the 3.5mm jack, but not above or below the Y-split. The cable has pre-formed heat-shrink earguides. The 2-pin housings have “L” and “R” indicators printed in white. The cable is moderately microphonic even with the use of the chin-adjustment choker.


The TinHiFi T4 Plus is intended to be worn cable-up. The earpieces have a moderate-to-deep insertion depth. The T4 Plus is neither comfortable nor securely fitting. The housings are on the larger side, which, combined with the deepish insertion depth, makes the user acutely aware that they are using IEMs. Isolation is average. The housings also frequently need to be pushed back into the ear canal. I did not experience driver flex with the T4 Plus.


My measurements of the TinHiFi T4 Plus can be found on my expanding squig.link database:

TinHiFi T4 Plus — Squiglink by Bedrock Reviews


The TinHiFi T4 Plus has a V-shaped sound signature that places more emphasis on bass than treble.

The T4 Plus has excellent bass technicalities, managing to strike a good balance between staying nimble in articulation yet still having impact. Bass is adequately resolving for the price and highly textured. There is ample sub-bass rumble. However, I do feel there is too much mid-bass, particularly between 100–200 Hz, which clouds the lower midrange. Midrange clarity is not great. Fast analog percussion, down-tuned and distorted electric guitars, and harsh male vocals can blur together. Combined with the T4 Plus’s limited soundstage, this creates a sense of vertical compression.

The T4 Plus centers its pinna gain region at roughly 2.5 kHz. I find that this causes the vocals and midrange instruments to blend together more than I would prefer. Male vocals do have plenty of warmth, grit, and body. Male vocal intelligibility is moderate. Female vocals enjoy notably better intelligibility and separation from the rest of the frequency response compared to male vocals. However, female vocals do sound a little husky. Midrange timbre is natural-sounding overall.

The T4 Plus has a subdued and unremarkable treble region. There is less in the way of sparkle or air than the T4 Plus’s measured frequency response would suggest. Overall detail retrieval is not quite up to the standard I would expect for this price. As mentioned above, instrument separation and soundstage are quite limited as well.


The TinHiFi T4 Plus can be powered by the Apple dongle, though I needed to set the volume on my Pixel 7 to 21/25 to reach my usual listening level when Spotify Normalization was set to “Normal.” Depending on your typical listening volume, music player of choice, and feelings on volume normalization when using a streaming service, you may have more leeway when using the Apple dongle than I do. I did not notice hiss with any of my devices.


The TinHiFi T4 Plus is not a bad IEM, but it is overpriced given what it brings to the table. If you are dead-set on a warm, bassy IEM under $150 and are more interested in strong bass technicalities than other performance aspects, it may be worth considering. Otherwise, I would look elsewhere.

The TinHiFi T4 Plus can be purchased below:

TINHIFI T4 PLUS Space Station

TINHIFI T4 PLUS 10mm Magnetic CNT Driver In Ear Monitor — Linsoul Audio