Rose Technics: Mysteries of the North Forest 
- review by AudioBuko

Rose Technics is a company that first gained fame with their Rose Masya earbuds and from then they started making more diverse products for the audiophile community like the North Forest, a dynamic driver driven IEM released around January that's aimed at the budget audiophile. Let's explore this intriguing forest with a review but before that, I would like to thank Penon and Rose Technics for this review unit. 


Driver: titanium metal rare-earth magnet steel dynamic driver
Earphone cable material: 128 shares 4n oxygen-free copper+ anti-pull bullet-proof wire
Earphone shell: aeronautical magnesium-aluminum alloy
Frequency response range: 14 ~ 23000hz
Sensitivity: 105db
Impendence: 18ohm 

The Rose North Forest comes in a sturdy black cardboard box that's covered by a slip off sleeve. Inside are the IEM's with fitted medium tips, and in the tray is 2 more pairs of silicone tips (Small and Large) as well as a double flange tip (white silicone), under the tray is space for the cable and nothing else. 

The North Forest is a single dynamic driver driven IEM house in an small aluminum case with plastic internal fittings, the simple design allows for easy fitting as a conventional earbud (wires dangling) or over the ear. In either position, the light design of the IEM helps in providing comfort while wearing it. The wire near the IEM has good strain relief and has the L and R markings for each IEM's position, the cable is non-removable and comes in a no microphone model and one with a mic, this sample has no microphone and has a slightly rubbery wire, it has a tendency to retain some curves but generally is resistant to tangling. Though there is no chin strap, the splitter is plastic covered in silver aluminum and looks nice. The plug has a rose branding and is similarly made of aluminum, it is very thin so it'll fit through most phone or DAP cases with no issue. Overall, the build is good and sturdy and will likely last a long time. 

Bass: The sub-bass of the North Forest extends rather well to give a good amount of bass rumble that is clearly felt but is not along the levels of the Ibasso IT01 in terms of reach and quantity, the mid bass has enough punch to make it's presence known and possesses a good amount of body. North Forest has good decay enough for good resolution of complex bass tones and has enough speed to sound complimentary to the music and helps it to be engaging.

Mids: There is a good amount of body with the North Forest, male vocals sound meaty with a good enough separation that the voices are not overwhelmed by the bass. Female vocals sound warm and smooth with a bit of intimacy but is treated nearly equally the same as male vocals as they occupy a neutral positioning. There may not be a lot of transparency in this area and there is a lack of crispness or definition but vocals come out clean and mixed with music provides a good and emotive progression.

Highs: Are naturally extended without sounding sibilant or harsh as they sound like they belong in the song, some high pitch sounds may surprise you on higher volumes but are not piercing. One thing to note is the dip in the 10khz area that prevents cymbal crashes to bloom and may sound rolled off. There is body and a good amount of clarity in the treble area that is not fatiguing and fun to listen to. 

Soundstage: For something that's small, there is a moderate amount of stage for the music to play around that sounds natural, with decent width and some depth that prevents it from feeling congested (St. James), resolution overall is good enough to track instruments and voices and 3d positioning is fairly accurate.

Driveability/Useability: This can easily be driven by the weakest phone in my arsenal and still sound better than certain stock earphones, but it doesn't scale much with the source (better players will push the North Forest to sound better, but not to a great degree). Considering the build, this can easily be seen as gym, exercise IEMs, sweat doesn't seem to bother the cables much, it's light and easy to insert and remove with no fear of a piece falling out (ohhh, two jabs in one paragraph!)

Conclusion: The Rose North Forest is a surprising IEM and shows just how far good tuning can get you at this budget range as it sounds musical where headbanging doesn't seem like a bad idea when listening to heavy rock or just thinking about your ex while listening to Adele, it's not gonna topple mid range IEM's at any time with more detailed, technical and revealing listening, but the fun you can get out of this is considerable and at an incredible value IEM at $24.90 USD, it sounds better than some IEMs in the market that are above it's price tag. 

Pros: Affordable, easily pocketable, sturdy, sounds great, looks nice, very easy to drive, good fit and isolation (with the right sized tips.)

Cons: L/R markings are hard to see (could have marked one and left the other blank for a tactile solution, or made both shell logos face forward for easy identification of left and right), cable is a bit rubbery/springy

Nitpicks: Removable cables or easily replaceable cables, it's a shame since they sound real good but if the cables break, it might be hard to replace the cables.

In case you want to pick one up, you can purchase the Rose North Forest at 

Sound testing was done using a Sony WM1a (Primarily), a Hiby R6 (for comparison) and a phone (for checking driveability) volume matched to 90.X db of safe hearing and calibrated using a 1kh tone on a dedicated DB Meter, all sources patched through a switcher.

Test tracks used:
A Different Way - Lauv
A Foggy Day - Van Morrison
A Question of Lust - Depeche Mode (Live 1988)
Alive - Pearl Jam
Billie Jean - Michael Jackson
Cheap Thrills - Sia
Come Away With Me - Norah Jones
Come Round Soon - Sara Bareilles
Country Road - James Taylor
Deeply Disturbed - Infected Mushroom
Discover Tokyo - Shuta Hasunuma
Do what you have to do - Sarah McLachlan
Dream a Little Dream of Me - Ella Fitzgerald
Get Lucky - Daft Punk
Hail to the King - Avenged Sevenfold
Ignorance - Paramore
Is This Love - Bob Marley
It's a Long Way To the Top - AC/DC
Lithium - Nirvana
Marian Hill - Breathe Into Me
My Curse - Killswitch Engage
One Day - Matishyahu
Photograph - Ed Sheeran
Pull Me Under - Dream Factory
Send My Love - Adele
September - Earth Wind and Fire
So Far Away - Martin Garrix
Staying Alive - Bee Gees
Sugar - Maroon 5
Sunday Morning - No Doubt
The Day The World Went Away - Nine Inch Nails
Way Down Deep - Jennifer Warnes
*St. James - Avenged Sevenfold (is my secret track, I really like this song!)

All the best.

Enjoy your next adventure!

Love from Head pie

TY Hi-Z 150ohm 4.4mm Balanced HiFi Earbud review 
- expatinjapan

Thank you to Penon Audio for sending this product for review

Earlier earbud shoot out:

Whats in the box?


The sound as usual was tested using various FLAC tracks, this time exclusively on the iBasso DX200 due to its 4.4mm amp.
Burn in was over 125 hours for those who care, and those who don't care,...don't care. everybody happy.

The TY Hi-Z 150 ohm balanced HiFi earbud is welcome entry in to the already existing range of earbuds in the TY Hi-Z line up.

See here for an earlier review shoot out of several earbuds:

lets revisit some bullet points from the earlier earbuds review:

"The TY-Hi Z 150S are very close to the HE150 than the differences between the 32/32s. 
The HE 150 is more forward overall whilst the 150S is laid back, or has a more subtle understated approach.
The HE 150 seem quite intimate and dynamic in that the music and vocals are pushed forward together, a little bit brash in its approach. But quite pleasing to my ears.
The 150S takes a more understated approach, softer, rounder, slightly smoother.
The 150S has a bit more layering and underlying detail."

"At this point I removed the foams. to get another angle.
The 150S is more defined than the HE 150, vocals slightly ahead of the music, it doesn't have the wall of sound effect that the HE 150 has. Instrument placement is more accurate.

The reality is that people arent probably going to use TOTL daps but rather smartphones etc to listen to these. I used the humbled yet effective and great sounding ipod Touch 6G as a final set of tests.
Some definition and detail is lost, but is is still a pleasing experience."

"Back to a TOTL, the Opus#2.
Its definitely more effortless and pleasing with both buds, I could honestly listen to both easily. Different flavors to be sure, but I think in the lower regions the 150S wins with more clear definition and no bleed or bloom between sub bass and bass.
Also the Ty Hi-Z 150S performs better at lower volume levels.
Overall it has more control."

So how does the TY Hi-Z 150ohm 4.4mm Balanced HiFi earbud compare. Sadly there must be some inaccuracies between my reviews in terms of time and space, yet also in the change of Amps for the iBasso amp 1 to Amp 4 and its different signature. Hopefully I can gather enough information to stitch together a decent impression for the reader.

Using the iBasso DX200 with the 4.4mm amp 4 module.

The sound is very smooth.
I can get a sufficient amount of volume on gain 1. At about the three quarter mark
The sound is close to the HE 150 with music and vocals fairly even, the vocals being a touch ever so slightly more forward than the music.
On gain 2 the results are fairly much the same.

The TY Hi-Z is an intimate earbud with a full sound, sound stage is medium, separation is quite good, layering is minimum. A bit warm at times in the lows. Mids are active and energetic, although not a defining feature.Treble reaches just far enough to give a sense of space, not extended.

 The TY Hi-Z when it comes to comparisons earbud to earbud using the Opus#2 (for 3.5mm buds) and DX200 (for the 4.4mm bud)  resembles the 150s more in overall signature.

The overall smoothness becomes more apparent. the TY-Hi-Z 150 4.4mm being a little bit warmer in the mids.
The 150s being a bit more airy and more transparent and lighter.
the 150 having a bit more warmer low end, and smaller stage.

At times the 4.4mm version seems to sit in the middle and take the best of both worlds of the afore mentioned buds.

If I had a 4.4mm to 3.5mm SE adapter I would have liked to run it through amp 1 on the ibasso DX200 for a better A/B test.

Results may perhaps vary when using with different 4.4mm daps.
Note: It is especially tuned for the Sony 4.4mm daps, perhaps the more warmer model I expect.

TY Hi-Z 150ohm 4.4mm Balanced HiFi Earbud


Its tuned specifically for the Sony series 4.4mm balance port.
Impedance: ≈150ohm
Cable Material: 8 core silver-plated handmade twisted wire
Sensitivity:115+-5 db
Frequency range: 16-23000Hz
Plug: 4.4mm balanced



From Penon Audio


The TY Hi-Z 150 ohm 4.4mm balanced earbud is an earbud for the newly knighted aficionados of the 4.4mm brigade.

Coming in at a middle ground between the previous HE/150 (Xxx) and TY-Hi-Z 150s (xxX).
The 4.4mm version shares the same cable to my eyes as the 150s, whilst the HE/150 and 150s share the same shell.

It is a fairly even earbud with deep bass where needed, sightly forward vocals but never excessively so. It exhibits a slight v shape, or soft L shape. It has enough treble to please, and like the mids isnt its defining feature.
It is generally accurate and pleasing to the ears, presenting each track reasonably true to its intended original intent.

It doesn`t fit securely into my particular ear shape, mine preferring a smaller Yuin type shell. This might be alleviated by using some ear hooks to hold them more flush If one wants the more fuller, deeper sound it can offer.

One can tailor the sound slightly with using donuts or full covers. Also having them hard against the ear canals increases the low end, whilst having them sit loose gives a bit more air to them.

A decent dap or added amp with a bit of power is needed to get the most out of any of these earbuds.

Thank you to Penon audio for sending the TY Hi-Z 150ohm 4.4mm Balanced HiFi Earbud for review