Letshuoer S15 - The King of Planar Iems
Pros
- Very punchy and dynamic sound for a planar
- Excellent Fit and comfort
- Good Stock Cable
- Laid back yet detailed sounding
Cons
- Sub-bass roll-off
- Some people may want more vocal presence.
- Price to performance ratio
- Stage fells 2D lacks front and back depth
- Imaging performance can be better
Specs And Driver Configuration
- 3rd generation 14.8mm planar + 6mm R-sonic 6mm passive filtering module
- Impedance: 35Ω@1kHz.
- Sensitivity: 106 db
Unboxing and Accessories Package
Let’s start with the unboxing experience, which I have to say is very good. The accessories provided in the box are good. Things provided include - 1. Hockey puck style case 2. Modular Cable 3. Eartips 4. 3.5mm, 4.4mm and 2.5mm termination, and 5. Iems itself. The cable feels very premium and sturdy, which is always expected from Letshuoer. The hockey puck style case is well built, but I find it too small to fit the iems properly. Letshuoer could consider enlarging the charging case slightly to make removing and inserting the IEMs more convenient. The eartips provided are average so I suggest you to tip roll, I will highly suggest divinus velvets and dunu s&s tips with this iem.
Design, Fit, and Comfort
Lately, Letshuoer has changed the design language and color schemes of their iems. They are now opting for a more understated and professional look instead of a flashy and blingy look. We saw this design language in cadenza 4 and we see this continue in S15 as well. The iem has 3d printed resin shells with aluminum face plates. The shells are on the lighter side with a grippy texture. Despite the light shells the iem feels well built. This lightness also provides excellent fit and comfort. It sits flush in the ear, so this can be a great option as a sleeping iem. The isolation provided is good, but not the best.
Frequency Response
If I talk about sound, this is the best planar I have ever heard. It is the most dynamic and punchy planar that has been released to date. The tuning is opposite to its predecessors S12 and S12pro, they have a V-shaped signature with a lot of treble emphases where whereas S15’s sound signature is warm and laid-back yet detailed sounding.
Bass
It is the most dynamic, punchy, and tactile bass that I have ever heard on any planar iem. It still has planar characteristics like speedy bass but the decay is more natural. I don’t what Letshuoer did to achieve this, in my assumption it is the 6mm R-sonic 6mm passive filtering module at work here.
The sub-bass is slightly rolled off, but you can put tape on the top vent to fix this. Without the mod, the sub-bass is good with decent rumble and texture, I wish Letshuoer did something to fix this sub-bass roll-off. The mid-bass thumps and slams come across very authoritatively. After reading this you might ask. Is the bass comparable to a good DD iem Bass, I still have to say no but when compared among planars this is the best bass I have ever heard.
Midrange
Mids are the part that can make or break this iem for you. The lower mids are on the warmer side plus the pinna gain starts at 1k and peaks at around 1.5k and then starts taper off. This tuning leads to female vocals sounding dull. Male vocals sound good tho, they are hefty and meaty sounding. Due to the upper midrange dip, the instruments also sound a bit dull. But due to this tuning choice there is no hint or harshness and fatigue present in this iem. Extended music sessions are a breeze on this iem. Now people who like warm back sound will love this iem but people who like lively vocals and listen to a lot of K-pop will not like this iem.
Treble
The treble is good, it is non-fatiguing yet detailed sounding. The air region is well extended, which helps the iem to sound more open and detailed. This is the region that needed reduction from s12 and I liked the direction that Letshuoer has chosen. People who didn’t like planar iems due to its treble should definitely try this iem.
Technical Performance
Now, let’s talk about technical performance and detail retrieval. The detail retrieval is good for the price. Maco and micro detail pick is good despite of the tuning. The technical performance is average thoo. The staging feels very 2 dimensional, side depth is good, but it fails to present front and back depth well. Instrumental separation and layering is also decent but i feel it lacks a bit in instrumental imaging, I was unable to exactly pinpoint instruments. Overall the the technical performance is good enough for the price.
Conclusion
So, what’s my conclusion, letshuor has released a very good competitor, in planar iem space. It takes a radically different tuning approach from its predecessor. This is my favorite planar iem currently. But, It is a bit on the pricier side for me to straight up recommend it. I would suggest you wait for a sale and try to give it a listen before pulling the trigger.
I will also release a video review of this iem, so if you want to watch that please subscribe to my YouTube channel - https://youtube.com/@sushiifi?si=OVzMVqeoThyYIS9d