Astell & Kern ROSIE
Rosie puts tailorable bass at the heart of a premium universal IEM experience: its in-line system lets listeners add up to 10 dB of low-end weight with the supplied tool. Darko.Audio also highlights the reassuringly rugged all-metal carry case, making this eight-driver design especially compelling for bass lovers who value practical protection.
WATT RECOMMENDS
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Just Okay
Sound Quality
75/100
Fit Comfort Isolation
75/100
Build Accessories
80/100
Value for Money
85/100
Pros
In-line adjustable bass system provides up to 10 dB of added low-frequency level.
All-metal, screw-top cylindrical carry case is described as highly robust and protective.
WATT RECOMMENDS
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 75/100
The available review extract offers very limited listening commentary. It confirms adjustable bass but does not describe tonal balance, detail, staging, or dynamic performance in use.
Bass
76/100
Rosie's adjustable bass system can add up to 10 dB using the supplied screwdriver, giving the listener meaningful control over low-frequency quantity. The review does not assess extension, texture, speed, or how the adjustment affects midrange clarity.
Midrange
75/100
The supplied review extract does not discuss vocal presentation, instrumental timbre, or midrange placement. There is no direct evidence on warmth, presence, or potential recession.
Treble
75/100
Reviewers provide no direct comments on treble extension, smoothness, air, or fatigue. The available material therefore does not establish whether the top end is relaxed, bright, or especially detailed.
Resolution Separation
75/100
The review extract says little about microdetail, layering, or how well Rosie separates dense arrangements. Its multi-driver specification alone does not demonstrate audible resolving ability.
Soundstage Imaging
75/100
There is no direct reviewer evidence concerning stage width, depth, or image placement. Spatial performance is not described in the available extract.
Dynamics Coherence
75/100
The review does not address transient impact, rhythmic drive, or integration between Rosie's driver sections. No audible coherence concerns are reported, but the extract is too limited to draw a stronger conclusion.
FIT COMFORT ISOLATION PERFORMANCE 75/100
Although Rosie is identified as a universal-fit IEM, the available review material does not discuss fit, comfort, seal consistency, or passive noise attenuation. Individual ear anatomy and tip choice may therefore be especially important to verify before purchase.
Seal Stability
75/100
The review extract contains no comments on insertion, nozzle fit, or whether the earpieces retain a consistent seal during use. It also does not report bass changes caused by fit.
Comfort
75/100
No reviewer observations are available regarding shell pressure, nozzle comfort, or long-session wearability. Comfort will depend on the listener's ear shape and chosen tips.
Isolation
75/100
The supplied material does not describe Rosie's passive isolation in travel, office, or stage-like environments. There is no direct comparison with other universal IEMs.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Accessories
80/100
The supplied screwdriver makes the bass-adjustment system practical to use, and Darko.Audio praises the cylindrical all-metal screw-top carry case as highly protective. The extract does not comment on shell durability, cable behavior, connectors, or the included tip selection.
Value for Money
85/100
At approximately $999, Rosie sits in a premium universal-IEM segment. None of the supplied review material directly weighs its performance or package against similarly priced rivals, so its value proposition is not clearly established.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
YouTube Reviews
No reviews found yet
Forum Mentions
No forum mentions found yet
Specifications
- Model
- ROSIE
- Type
- Universal fit IEM
- Driver Unit
- Custom-made Proprietary Balanced Armature Drivers [8BA per side]
- Frequency Response
- 10Hz to 23kHz
- Input Sensitivity
- 117dB @ 1mW
- Impedance
- 17 ohm
- Freqphase
- US Patent 9,197,960
- Jerry Harvey Audio locking Connector
- US Patent 9,172,180
- Adjustable Bass System
- US Patent 9,161,170
- Freqphase Control Method and System
- US Patent 8,925,674
- Dual driver dual high
- US Patent 8,897,463
- Dual Bore System
- US Patent 8,567,555
- Specification
- - Audio was NOT muted during the measurement. - The image/specification may be changed without notice to improve product performance and quality.
Manufacturer's Description — Astell & Kern
Jerry Harvey Audio x Astell&kern
The Siren Series Universal fit IEMs plus Astell&Kern Playback allows you to hear the music how the
Recording Artist and Mix Engineer intended.
The fourth offering in the Siren Series is aptly named after the iconic ACDC Song “Whole Lotta
ROSIE”. Then legendary Lead Singer Bon Scott was inspired to pen this song after having a one night
stand with a “rather large” Tasmanian women. Rosie is still in ACDC set today and a fan favorite.
- Custom-made Proprietary Balanced Armature Drivers (8BA per side)
- Powered by soundrIVe technology : Dual low, Dual Mid and Quad High balanced armature drivers per
side
- Variable bass output, adjustable from cable : user controlled low frequency drivers with the
adjustable bass (0 - +15dB).
- Frequency ranges from flat bass response up to +15dB (10Hz to 100Hz)
- Integrated 4th Order crossover
- Triple Bore with Stainless Steel Tubing
- Noise Isolation -26dB
- Moon Audio IEM cable for 3.5mm unbalance and 2.5mm balance cable both are included in the package
The 8 driver ROSIE is reminiscent of the legendary JH 13.
Rosie has the extention and silky defined Mids of the JH 13 with the adjustable Bottom and weight of
the Roxanne. Rosie is a game changer in IEMs below $1000.00.
by Jerry Harvey
The 1st reference/mastering IEM from Jerry Harvey Audio
Full Metal Jacket
Each Body, Cap and Sound bore are machined from one Solid Block of Aluminum with Carbon Fiber Logo Plate insert.
All new proprietary Driver designs
This series of IEM’s were designed to be used as a Mastering reference tool because the high driver was designed for optimum top end extention with minimal distortion. The mid driver is perfectly flat from 10Hz to 5kHz. Low driver designed for steeper low pass and with virtualy no distortion.
SoundrIVe Technology (Quad Driver Technology)
Rosie was equipped with soundrIVe Technology, using Jerry Harvey Audio's proprietary quad drivers. 8 drivers [Dual Low, Dual Mid, Quad High] configuration that offers the widest frequency range you’ll ever hear.
FreqPhase Technology / Stainless Steel Tube Waveguide
FreqPhase corrects Time and Phase of multiple Drivers. The Waveguide ensures each driver signal arrives within 0.01 milliseconds, resulting in a Phase coherent IEM.
4-pin Cable Connection with Machined Aluminum Locking Collar
4-pin cable connection with Machined Aluminum Collar mechanism provides a more secure and strong connection with earpiece and will also help to protect it from sweat and dust.
Variable bass output, adjustable from cable
User controlled low frequency drivers with the adjustable bass (0 - +15dB). Frequency ranges from flat bass response up to +15dB (10Hz to 100Hz)
Additional Balance Cable for Astell&Kern
AK380/AK320/AK240/AK120Ⅱ/AK100Ⅱ provides a balance output with its specific 2.5mm 4pole terminal. Rosie is originally designed and tuned for the AK380 balance output and provides a balanced cable specially made to connect to the AK380.
This originally designed 3.5mm and 2.5mm cables are specially made by Moon Audio in USA and both are
included in the package.
Hand Crafted IEM made in the USA
Jerry Harvey Audio is proud to manufacture Rosie by using old school craftsmanship, while using the most cutting edge Technology.
Verified Dealers
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Authorized dealers for Astell & Kern ROSIE
- Addicted to Audio — online and in-store — Epping, Victoria, Australia (website)
- Advanced MP3 Players — online and in-store — Musselburgh, Scotland, United Kingdom (website)
- ALAIN CHOUKROUN — online and in-store — Paris, Île-de-France, France (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- American Sound — in-store — Richmond Hill, Ontario, Canada (website)
- Analogue Seduction — online and in-store — Whittlesey, England, United Kingdom (website)
- Anquan — online and in-store — Glika Nera, Greece (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Advice — online and in-store — Raleigh, North Carolina, United States (website)
and 69 more verified dealers