Canadian Shipping Details
We offer free shipping in Canada on most items when an order totals $99 or more before tax. Some exceptions apply; click here for our full shipping policy.
Estimated free shipping transit time
- Greater Toronto Area: 1-2 business days
- Rest of Ontario: 2-3 business days
- Quebec: 2-3 business days
- Maritimes, Manitoba: 3-4 business days
- Alberta & Saskatchewan: 4-5 business days
- British Columbia: 5-6 business days
- Territories: 6-10 business days
Express options available at checkout. Orders dispatch next business day.
Toronto Store Pickup
Select in-store pickup at checkout and collect your order from our store in Toronto.
Find our entrance on Bay Street, near Charles Street West. We also have a pickup area in the Manulife Centre parking garage. Click here for directions. Before coming to the store, please wait for a confirmation email indicating your order is ready for pickup.
⚠️ No Returns on Headphones Once Opened
Buy with confidence, backed by Price Protection: if our advertised price goes down within 30 days of your purchase, contact us and we'll refund the difference.
For hygienic reasons, there are no returns on headphones and earphones once opened.
All in-stock headphones are available for personal demonstration in-store. We encourage you to try before buying to ensure satisfactory sound, fit, and functionality.
Click here for our full return policy.
If an item is defective upon receipt, please notify us within 30 days of purchase so we can arrange an exchange. For issues following 30 days, we will work with you and the manufacturer within the scope of each brand’s warranty and service policies.
Description
A4s
Four Driver Custom In-Ear Monitor
Custom-Fit, Custom-Look, Custom-Made
Used on stage by touring bassists and drummers for artists like Twenty One Pilots and Billie Eilish, 64 Audio's quad driver CIEM is a "hybrid" design incorporating two different driver types, DD and BA.
Following proven targets for fidelity and preference, these CIEMs are powerful, enveloping, and deep while avoiding being muddy; this kind of bass can only be produced by a dynamic driver. We chose a dynamic driver (DD) for the lows for its enveloping and deep response. This new driver is paired with three balanced armature drivers (BA), one of which is 64 Audio's signature Tia high driver for clear highs.
Inside A4s is our Tia technology, LID and our patented Apex and 3Dfit tech. While this model is targeted at musicians looking for a rich enveloping monitoring experience, the frequency response, detail, and soundstage capabilities of A4s even exceeds other audiophile products at this price point.
Bay Bloor Radio in Toronto makes custom in-ear monitors easy:
1. Decide and customize.
At our store in downtown Toronto, we have "universal" versions of 64 Audio's custom IEMs available for testing. While they won't perfectly conform to your ears or have the insertion depth like the final product, they'll give you an idea of sound signature so you can make the best decision for your tastes and needs. Our expert staff can also guide you through customization options and accessories.
2. Make impressions.
Once your order is in, you'll need to have impressions taken of your inner ears. To make things easy, we've partnered with a nearby audiologist familiar with 64 Audio's specifications. Our $49 CAD custom shipping package takes care of international shipping in both directions, and covers all cross-border import fees and customs brokerage — no need to worry about surprise charges upon delivery.
3. In production.
Each 64 Audio CIEM is hand built by highly specialized technicians in Vancouver, Washington. They will scan your impressions to perfectly recreate the intricacies of your ear shape, mapped to fit all internal components, then printed into 3D shells made from hypoallergenic acrylic. Once drivers are installed and tested by hand, your custom faceplate is the final touch to a truly one-of-a-kind earphone.
A4s is also available in a universal version, U4s.
The popular U4s universal IEM carries the same driver configuration in an elevated solid aluminum shell. It features upgraded packaging and accessories, including all three sets of Apex modules, a premium cable, multiple eartip styles and sizes for fit and sound flexibility, and leatherette case.
As UIEMs are not customized to each wearer, multiple people can enjoy the earphones throughout their lifespan. They are also available for purchase with minimal to no wait time.
SOUND
This is a true audiophile grade IEM in every aspect, incorporating many of the essential elements found in our upper-midrange and top-of-the-line CIEMs like N8 and A18s.
A4s sounds light on its feet while effortlessly delivering physically engaging sub-bass without bleeding into the mid-bass. Balanced mid frequencies and a pleasant high-mid band respond well to a wide array of music and recording styles at every volume level; present but not fatiguing.
High frequency response toes the line between neutral and detailed; balanced enough to mix a record on while offering the extension needed to make a recording really come alive. The tia high-driver’s open airy quality couples with the extended sound-stage provided by apex for a lifelike sonic experience.
Adding apex modules (sold separately) allows the listener to further customize the sound of the A4s based on their taste and the needs of the music.
"The new A4s are a joy to listen to. They’re clear, balanced, and have rich gorgeous low-end. A perfect choice for drummers and bass players. Like all of 64 Audio’s IEMs, the fit is super comfortable and the apex vent makes it so you can wear them for hours without any ear fatigue, which really comes in handy for those long rehearsal days. There is no better option at this price point!"
– Andrew Marshall (Drums: Billie Eilish)
– Andrew Marshall (Drums: Billie Eilish)
"I love how the A4s low end response is focused right where my bass sits. In a crowded mix with a loud auience and tons of stage noise, the booty never shrinks on me."
– Skyler Acord (Bass: Twenty One Pilots)
– Skyler Acord (Bass: Twenty One Pilots)
CUSTOMIZATION
Along with a number of acrylic shell options, there are dozens of faceplate colours and materials, which translates to hundreds of unique combinations. On top of all those options, you can even add custom artwork to make your IEMs truly one-of-a-kind. Left and right sides can be configured separately. Costs vary based on the options selected.
Also offered are a selection of connector types and cable. 2-pin connectors are an industry standard socket for IEMs, opening up more aftermarket cable options, ideal for audiophiles looking for flexibility. IPX (sometimes referred to as T2) connectors are moisture resistant snap-in sockets made by Estron A/S, which have proven to be a most robust choice for live music performers. Along with the socket you can choose between two cable colours and lengths.
TECHNOLOGY
3D-Fit for Custom IEMs
Exclusive technology preserves the detail of your ear impressions using a new process of digital rendering and 3D-printing. Compared to conventional wax-dip molding, this process reduces distortion in the impression for the most precise and comfortable custom in-ear monitors available. All of our Custom In-Ear Monitors and Custom Earplugs are crafted using this process.
The patented process of incorporating acoustical tuning features within an IEM’s shell allows for designs that would otherwise be impossible to build using traditional methods. We incorporate these advanced and uniquely complex features into the shell in order to manipulate the audio produced by the IEM.
Tubeless In-Ear Audio
64 Audio's tia is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. A4s features two major elements of the tia system:
The tia driver is an open balanced armature speaker design that brings new meaning to resolution and transparency. It delivers airy, crisp, and microdetailed upper frequencies with characteristics not often found in a headphone or in-ear monitor. By opening a balanced armature, the diaphragm becomes fully unobstructed, unleashing the sound potential of the driver. This eliminates a lot of the vibrations and resonances that are inherent in conventional, closed balanced armature designs. With this new method of producing and delivering sound to the ear, conventional sound tubes and dampers are no longer necessary.
The tia single-bore design is a huge leap forward in eliminating unwanted tube resonance. The large bore itself serves as a sound-shaping chamber and aids the tia high driver in delivering a linear and coherent frequency response. Because of the extremely short sound path of the tia high driver, a remarkable high-frequency extension and smoothness is achieved. The large single bore also helps prevent clogging of the tip and obstruction of sound.
Air Pressure Exchange
Apex is a patented vent that releases air pressure in a sealed ear canal all while retaining a level of isolation; this venting alleviates listener fatigue and allows for a much more realistic soundstage.
When you seal a miniature speaker in an ear canal, the air inside becomes trapped. As the speaker produces sound, it moves the air and causes the eardrum to work excessively. The pneumatic pressure exerted on the eardrum causes ear fatigue. Apex relieves this pressure, allowing the eardrum to move naturally, so you can comfortably listen longer.
Apex enables air to move freely in the ear canal, which extends the perceived soundstage and allows for a more natural listening experience. Everything from inserting, wearing, and removing the IEMs becomes a much more natural and painless process.
Apex is implemented in A6t via interchangeable modules, so you can quickly switch between different levels of isolation and sound signatures. Although the modules technically only affect the low frequencies, this psychoacoustically affects your perception of the whole frequency range.
- The m20 module (included and fitted by default, -20dB noise isolation) greatly increases sub-bass response while keeping the mid-bass clean. While this module shrinks the sound-stage width, it works especially well for synth heavy or modern pop music.
- The m15 module (sold separately, -15dB noise isolation) allows you to hear the clarity of your music along with some of your surroundings. Great mid-range presence and staging.
- The mX module (sold separately, -10dB noise isolation) delivers the widest imaging with a reduction in noise isolation. Because of the reduction in sub-bass response, it creates a slight tilt in perception towards high frequencies.
Linear Impedance Design
Smartphones, body packs, amps, and DAPs produce audio with different output impedances. The interaction of the earphone impedance curve with the sources may result in the same IEM sounding different with different sources.
LID is a proprietary circuit that corrects the non-linear impedances of the drivers that comprise this four-driver IEM, restoring proper interaction with the source and preserving the desired sound signature, so you can enjoy the same sound reliably across sources.
IN THE BOX
- A4s Custom In-Ear Monitors
- 64 Audio Personalized Protective Case
- Dehumidifier
- Cleaning Tool
- Shirt Clip
- 48" or 64" Detachable Professional Cable
- m20 apex Modules
- Round Sticker
- Product Manual
SPECIFICATIONS
Driver Type
Dynamic & Balanced Armature
Driver Configuration
1 dynamic low, 1 BA low-mid, 1 BA high-mid, 1 tia high
Frequency Response
10Hz – 20kHz
Sensitivity
107 dB/mW (94mV) @ 1kHz
Impedance
11Ω @ 1kHz
Crossover
Integrated 4-way passive crossover
Isolation
-20dB with m20 apex module (included)
-15dB with m15 apex module (sold separately)
-10dB with mX apex module (sold separately)
Due to their bespoke nature, there are no returns on custom earphones once ordered.
When you purchase from Bay Bloor Radio, our expert staff will assist with each step of the custom fit process. Universal demo earphones are available in-store to assist you in selecting the right model.
Because of the many variables involved in creating a custom product, sometimes a fit adjustment may be needed. For this reason, 64 Audio offers a 30 Day Fit Guarantee to ensure that your IEMs fit comfortably and retain a proper seal.
If a fit adjustment is required 64 Audio will need the IEMs sent back for the shells to either be shaved down or built up in the specified problem areas. 64 Audio may, at their discretion, rebuild your IEMs for which new impressions may be required. In some cases, prior to starting the rebuild process, empty test shells may be sent to you to determine if the adjustments have corrected the fit issue. The cost of two-way international shipping, import, and brokerage for all refits is $49 + tax. Customers may alternatively choose to ship items back to 64 Audio at their own expense. Cosmetic properties such as the height of the IEMs due to space required for drivers, cable connectors or faceplates are not considered a defect and would not be covered under the fit guarantee.
Specs
Dimensions
About 64 Audio
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We’re here to answer your questions and help you make the right choice.
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