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Nine-driver hybrid reference in-ear monitor

Mockingbird

Successor to the acclaimed W900. Nine drivers across four dedicated frequency bands. Proprietary tuned dynamic woofer for natural sub-bass. Bespoke super tweeter armatures extend to 40kHz. TrueXross 4-way crossover eliminates phase shift for high-end speaker-like coherence. Universal or custom fit.

Price$2,299.00 SGD

  • 9-driver hybrid
  • TrueXross crossover
  • Bespoke super tweeter
  • Universal/custom
Explore the build
AAW Mockingbird nine-driver hybrid reference universal in-ear monitors with detachable cable

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9Hybrid drivers. Universal or custom fit.
4-wayTrueXross crossover network.
10Hz-40kHzFrequency response with bespoke super tweeters.
15 OhmImpedance. Drives from any source.

Design Story

Successor to the W900. Reference, redefined.

Mockingbird is the successor to AAW's acclaimed W900 and represents the summit of our ideology: fusing the best traits of dynamic and balanced armature drivers into a single coherent stage. Instead of using high-order RC crossover networks that introduce chaotic phase shift and scrambled arrival timing, AAW developed TrueXross — a completely new approach to solving the classic coherence issue in hybrid earphones.

The dynamic driver is proprietary tuned at the diaphragm level. A physical low-pass filter further restricts it to a minimal overlapping frequency range relative to the balanced armature drivers. Combined with precise positional arrangement and front acoustic chamber design, the result is improved coherence, minimized phase shift, and optimized arrival timing across the entire spectrum.

Built as true reference equipment: powerful yet natural sub-bass you will never find in a full balanced armature IEM, inherited AAW musical imaging and instrument separation, and a realistic sound stage stepped up with extended treble and superior detail retrieval. Same driver platform, same TrueXross crossover — universal or custom.

Fitment Options

Available in universal and custom fit.

Universal fit ships with LiquidMorph tips, AAW foam tips, and assorted silicone tips. Custom fit is built from ear impressions. Both use the same nine-driver hybrid reference platform.

AAW Mockingbird universal in-ear monitors with detachable cable
Universal fitShips with LiquidMorph and foam tips. Stable seal, quick sizing, daily handling.
AAW custom-fit in-ear monitors showing personalized shell and faceplate finish
Custom fitBuilt from ear impressions. Personalized shell, stronger isolation.

Acoustic Architecture

TrueXross crossover. No chaotic phase shift. One coherent stage.

Traditional high-order RC crossover networks create phase shift and scrambled arrival timing in hybrid earphones. TrueXross eliminates this — the dynamic driver uses a physical low-pass filter so it operates in a minimal overlapping range versus the armatures. Precise positional arrangement and front acoustic chamber design then align the wavefronts. Mockingbird uses a 4-way crossover network with dedicated woofer, mid, treble, and super tweeter paths. The bespoke super tweeter armatures — developed with the world's leading BA manufacturer — sustain sound pressure to 20kHz and extend to 40kHz.

AAW Mockingbird

TrueXross Reference Hybrid

9 drivers across 4 phase-aligned frequency bands

1 x Dynamic Woofer
3 x Mid BA Drivers
3 x Treble BA Drivers
2 x Super Tweeter BA

Key Features

  • Nine-driver hybrid reference architecture
  • TrueXross 4-way crossover network
  • Proprietary tuned dynamic woofer with physical low-pass filter
  • Bespoke super tweeter balanced armatures extending to 40kHz
  • Universal and custom-fit configurations
Sensitivity108dB
Impedance15 Ohm
Frequency Response10Hz - 40kHz
Total Harmonic Distortion≤0.5%
Driver Count9-driver hybrid
Fit OptionsUniversal / custom

Sound Signature & Frequency Response

Reference performance. Measured and verified.

Mockingbird is tuned as true reference equipment. The frequency response is the result of TrueXross 4-way crossover tuning — proprietary dynamic woofer delivers natural sub-bass extension, and the bespoke super tweeters sustain output past 20kHz. Every driver band is shaped for phase coherence, not just amplitude. The end result is high-end speaker-like performance condensed into the tiny footprint of an IEM.

Low

Natural sub-bass

Proprietary tuned dynamic woofer delivers powerful yet natural low-end you will never find in a full BA IEM. Physical low-pass filter keeps it clean and phase-coherent.

Mid

Acclaimed imaging

Inherits AAW's highly praised musical imaging and instrument separation. Vocals and instruments sit in a realistic, layered sound stage with precise positioning.

High

Extended treble

Bespoke super tweeters sustain SPL to 20kHz and extend to 40kHz. Superior detail retrieval without fatigue. Cymbal air, string harmonics, room cues — all present and natural.

Stage

Speaker-like coherence

TrueXross eliminates phase shift and scrambled timing. Wide stage, accurate positioning, layered depth. Nine drivers performing as one coherent source.

AAW Mockingbird frequency response measurement graph showing TrueXross 4-way crossover tuning with extended treble to 40kHz
TrueXross 4-way frequency response. The proprietary dynamic woofer handles the low end with a physical low-pass filter to minimize overlap. The bespoke super tweeters extend treble to 40kHz. Every band is shaped for phase coherence at the crossover points.

Cabling and Accessories

The everyday kit.

Null Audio Symphonym Tiburon UPOCC copper braided cable with 2-pin connector
01

Symphonym Tiburon cable

48 inch Null Audio Symphonym Tiburon UPOCC copper cable. Low microphonics. Detachable 2-pin connector.

LiquidMorph clear ear tips with teal inner bore
02

LiquidMorph tips

Silicone tips with a teal inner bore. Keeps the dynamic woofer sealed for consistent bass and center image.

LiquidMorph ear tip accessory tray with multiple sizes
03

Size tray

Multiple sizes in one tray. Faster fit checks before a show or session.

AAW branded wooden carry case with secure zip closure
04

Wooden carry case

AAW branded semi-rigid wooden case. Protects your Mockingbird monitors on the go with a secure zip closure.

Specifications

Nine-driver hybrid reference numbers.

Proprietary dynamic woofer. Eight armatures including bespoke super tweeters. TrueXross 4-way crossover. 10Hz to 40kHz. 15 Ohm.

Driver Count
Nine
Crossover
4 Way
Sensitivity
108dB
Impedance
15Ohm
Frequency
10Hz - 40kHz
Distortion
≤0.5%

FAQ

Before you choose Mockingbird

What is the Mockingbird driver configuration?

Nine-driver hybrid reference monitor. One proprietary tuned dynamic woofer with physical low-pass filter for natural sub-bass. Eight balanced armature drivers including bespoke super tweeters covering mids, treble, and ultra-high frequencies. TrueXross 4-way crossover network.

What is TrueXross?

TrueXross is AAW's proprietary approach to solving the classic coherence issue in hybrid earphones. Instead of using high-order RC crossover networks that cause chaotic phase shift and scrambled arrival timing, TrueXross uses a physical low-pass filter on the dynamic driver so it operates in a minimal overlapping frequency range relative to the balanced armature drivers. Combined with precise positional arrangement and front acoustic chamber design, this achieves improved coherence, minimized phase shift, and optimized arrival timing.

What are the bespoke super tweeter drivers?

AAW worked with the world's leading balanced armature manufacturer to develop custom super tweeter drivers exclusively for Mockingbird. These bespoke drivers sustain sound pressure level all the way to 20kHz and extend to 40kHz, delivering extended treble and superior detail retrieval that gives Mockingbird its high-end speaker-like performance.

Is Mockingbird available as universal and custom fit?

Yes. Universal-fit units ship with LiquidMorph tips, AAW foam tips, and assorted silicone tips. Custom-fit units are built from ear impressions. Both use the same nine-driver hybrid reference platform.

What sound signature does Mockingbird have?

True reference signature. Powerful yet natural sub-bass that full BA IEMs cannot reproduce. Inherits AAW's highly praised musical imaging, instrument separation, and realistic sound stage. The bespoke super tweeters deliver extended treble and superior detail retrieval. The end result is high-end speaker-like performance in an IEM footprint.

What comes in the box?

48 inch Null Audio Symphonym Tiburon UPOCC copper detachable cable, wooden AAW carry case, LiquidMorph tips, AAW short-stem foam tips (S/M/L), AAW assorted silicone tips (S/M/L x2). One-year limited warranty.

Built by Advanced AcousticWerkes

IEM craft, shaped by listening.

Those who listen will find the way.

Advanced AcousticWerkes (AAW) is a Singapore-based IEM brand founded in 2014 by Kevin Wang. AAW designs and builds custom and universal in-ear monitors across dynamic, balanced armature, electrostatic, planar, and hybrid platforms.

Mockingbird is the successor to the acclaimed W900 and represents AAW's nine-driver hybrid reference flagship: proprietary tuned dynamic woofer, bespoke super tweeter armatures, TrueXross 4-way crossover, and precision-engineered acoustic chambers. High-end speaker-like performance — universal or custom.

About AAW

Where to buy

Hear AAW in Singapore and beyond

AAW is based in Singapore. To audition, buy, or get support, start with the AAW office or a dealer below.

Singapore dealer

Zeppelin & Co.

1 Rochor Canal Rd, #02-78 Sim Lim Square, Singapore 188504
PH: +65 9337 9655
Hours: Tuesday-Saturday 11:30 AM-8:00 PM; Sunday 12:00 PM-7:00 PM. Closed Mondays.

Singapore dealer

JABEN

1 Coleman St, #01-25 The Adelphi, Singapore 179803
PH: +65 6337 0809
Hours: Monday-Saturday 12:00 PM-8:00 PM. Closed Sundays.

Singapore dealer

AV One

1 Coleman St, The Adelphi, Singapore 179803
PH: +65 6337 0080
Hours: Monday-Saturday 11:00 AM-7:30 PM; public holidays 1:00 PM-6:00 PM.

Global listening rooms

Outside Singapore: Hong Kong, Macau, Japan, China, South Korea, Thailand. Dealers include DMA, Fine Up Computer, Let's Go Audio, Music Movie Driver, e-earphone, Step Sound, Sorishop, and SoundProofBros.

Find a listening room

Mockingbird

Successor to the W900. Reference, redefined.

  • 5 stars: 15 (88%)
  • 4 stars: 1 (6%)
  • 3 stars: 1 (6%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Aleksey N.
AAW 500 CIEM Demo

Beautiful and comfortable headphones. Very detailed and rich sound. Headphones are very smooth in sound. Butt joints, as in hybrids, are completely silent.

B
Bruno
Audio library rediscovery ahead !

Hello,
The combination Mockingbird iem + Aoraki cable is really enjoyable, i.e. mind-blowing! Known tracks of various genres (baroque, reggae, trance, ...) are now more detailed. This gain doesn't come at the cost of musicality; you can enjoy beautifully rendered tunes as a whole or focus effortlessly on a counter melody!
I haven't tried them with my phone yet but they are easily driven by an Hiby R6 balanced output, so there shouldn't be any problem.
The only "warning" I would like to share is that these iem are thick (for a good reason, 1 dynamic driver + 2 mid BA + 2 high BA take some space). I own the universal version and they tend to get out of my ears when I get agitated. My advice would be to get the custom version to enhance insertion into the ears.
Anyway this is nothing compared to the pure audio bliss these iem represent!

L
Luigi Maria Larocca
Some problems

First i want write positive impression, like rapid delivery also using economico shipment. In addition no custom duties. But te earphone was packed orribly in plastic bag without pouch or bag. But, the worst was that tips (just six S/M/L) was not for W900 (probable 200 instead 500).Not a good deal.

N
N.O

Very good sound. I am satisfied.

F
Frédéric Cudeiro
Custom process is not OK...

I bought a pair of AAW W500 late 2017 and could never use it due to catastrophic fit. I don't know where it went wrong: myself, the audiologist (prints checked by photos by AAW before buying, I had to go to a second audiologist) or AAW. But in my opinion, the whole process is unsound: when the fit is not correct, it is incredibly difficult for the final user to guess what's exactly wrong. Do we need no remove some thickness here, or to add some thickness here? It turns out to be a "guess game", with a lot of time and money loss for both parties. (Sendind the earbuds to AAW would cost me about 50EUR (60USD) each time, plus there is a risk of tax or parcel loss). Finally, the process was so time consuming and, to avoid additional money loss, I decided not to return the earbuds for re-fit. So I have been having 1000EUR earbuds taking dust on my desk for more than a year. That's, by far, the most disappointing audio buy I ever made...

PS: re-post because my review was just deleted!

G
G.LTan
Retuen Customer

Advanced AcousticWerkes W500 Reference Hybrid Custom In-Ear Monitor and partner with vitesse cryo 7n Cgocc pure copper provide those listener who seek a overall listening pleasure .Performance even better then W900 series

A
Alonzo Johnson
Awesome CIEMs

Fit feels great, W900 definitely is something special. Phenomenal sound!

s
sanj
earphonia.com - review - Extended Aural Immersion

Technically this is strong at all aspects but somehow all the musicality is still present, many other technically strong earphones seem to result in a clinical feel.
With the W900 you get a smoothness, even in all the complexity, the signature is so very well balanced across the whole spectrum.

As I’m sure you can tell I really am impressed with the W900 and it has the perfect balance between musicality and reference.

Sound stage is so very expansive and the signature coherence really gives a level of refinement, placing the W900 in amongst the top tier league of high end earphones.

L
Linda Keh
Advanced AcousticWerkes W500 Reference Hybrid Custom In-Ear Monitor

Perfect combination with Vitesse Cryo 7N CGOCC-A Pure Silver Earphone Cable with the W500.Wide soundstage,sweet vocal ,punchy bass..No regrets for the first CIEM that i have bought.Hope for more improvement after the burn in period.

C
Clifton leong
W500 Bang for Buck!

This is my first CIEM, and would probably be the last.
Paired with Fiio x7 Mark II

I would definitely recommend this IEM if you’re into treble, clarity and brightness with a significant depth of soundstage. This IEM is more focus on the higher fq rather than lower, the bass is just right without engulfing the highs of the music. I placed the ordered with the Lune cable hence pairing it with the best economical combination available from Null Audio and have not regretted my choice since.

I was service by ZX at the studio and she was extremely nice! Fitting done by her was extremely good and comfortable, didn’t had to go back for a refit. If you’re new into CIEM and don’t mind cost, it will be an good investment for the next few years.

I would like to send my appreciation to ZX for assisting my friend in reshelling her CIEM too! =)

J
Jarry H.
After 150hrs review

The sound comes to life and it's very comfortable in the ears, a really unique and promising warm sound signature with its balanced treble energy, quite good layering ability.
Its black background and low frequency naturalness; the craftsmanship and comfort is top notch.
The W500 AHMorph has the addictive bass and it gives W500 a bit of its warm tonality and plus the wide soundstage,
till tend to forget that it was there because you to immersed in the great eargasmic experience.
Oh, and the switch. I'm glad to choice AHMorph. It's more fun than W500. I preferences the tune between Blue and Yellow point. In this tune,(Compare with the Mix tune yellow point) it bring the vocal closer, more deep soundstage, more prominent and slightly more natural hits.

L
Liu W.
Excellent hybrid reference monitor done right

The W900 a hybrid reference monitor with good layering, imaging and instrument separation. It is easy to pick up alot of details and instrument positions with this monitor.

The mids have enough body without being overly forward or aggressive, making vocals a pleasure to listen to.

The bass is another strong trait of the W900, the strong, impactful bass kicks in at the right time and moment with great control.

For years, I have been more accustomed to a warmer/fuller sound signature such as the fitears/westone monitors, but owning a W900 made me appreciate what a hybrid reference monitor can do; bringing out immense amount of details in an exciting manner.

G
Ghifari Daulagiri
Bass bass basss

Deep bass, sparkling treble, forward mids. Really nothing to be desired, it's really end game quality!!

A
Aik Tak Chan
Brilliant piece of musical masterpiece

To start off, i am not a advanced reviewer who can describe a piece of equipment in detail technical aspect. But i would like to share my experience of my W900. i was auditioning W500 back in Nov and really like the bass it was delivering. I then sent a msg to Kevin and realized that W900 will be launching and he was asking if i would like to hold on for a while. When i auditioned the W900 for the first time, i didnt find it as intriguing as W500. The bass didnt seem as impressive as the W500. In fact it sounded a little flat to my taste as i was looking for a V-shape sound signature. However, i noticed that the W900 was a very revealing piece of iem. I could suddenly hear a lot of details that i did not hear before. Essentially it was like upgrading from full HD to 4K. I therefore made the leap and ordered a pair. Now, I am getting hooked to W900 as i am rediscovering all the albums that i have with even more details that i have never heard before. As for the build, they were very well built with no bubbles or flaws. i have requested for custom artwork for my order and they look lovely when i got them. Although there was some fitting issues but it was resolved promptly and now i have perfect fit and sealage. Fantastic job to the guys at AAW.

M
Michael Amouyal
AAW900, an elegant musical reference

I really like this iem, and I have high expectations (I own SE5 Ultimate, KSE1500, S-EM9, Prophile 8. etc.) and I was not disappointed.

It is airy and spacious, very detailed, and musical without being too colored. What is particlulary impressive, is that besides have 9BA + 1dynamic, they sound very coherent. The bass is very punchy but tight, controlled and detailed. Mids are clear and even, high are extended yet completely smooth and non peaky. Some could think the highs are not so sparkly but I like this sound, it is not fatiguing yet technical.

All in all, if you look for a great reference all rounder, you should consider these.

M
Michael A.
AAW900, an elegant musical reference

I really like this iem, and I have high expectations (I own SE5 Ultimate, KSE1500, S-EM9, Prophile 8. etc.) and I was not disappointed.

It is airy and spacious, very detailed, and musical without being too colored. What is particlulary impressive, is that besides have 9BA + 1dynamic, they sound very coherent. The bass is very punchy but tight, controlled and detailed. Mids are clear and even, high are extended yet completely smooth and non peaky. Some could think the highs are not so sparkly but I like this sound, it is not fatiguing yet technical.

All in all, if you look for a great reference all rounder, you should consider these.

T
Trevor V
Gradient multi color schemed W500

Super Happy with the result. Great Sound. Great Finish.

The Good:I have been looking for a set of high end monitors that are not simply flat or too analytical. These deliver all that I have been looking for and so much more, in the sense that it offers the exciting sound that I was looking for but could not find for so long. The sound is very clean but you still have a nice bottom end bump while maintaining accuracy.

The Not so good: I do wish however that there was some grippy section or indentation to make removal easier. The cable while good tend to be a bit sticky and should really be about 5 inches longer. The final bad thing about these is that weird people would want to touch it simply because it is different and then simply dump it back on your desk if you are not careful...treating it like your regular I-buds, so it would be best not to let people touch it.

Happy customer for sure :)
https://www.facebook.com/acousticwerkes/photos/pcb.574295022773281/574294662773317/?type=3&theater

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Mockingbird Reference Hybrid Custom In-Ear Monitor
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