Elise Audio x Symphonium Helios SE

Custom Tuned True 4-Way Crossover with FLAT Technology

  • Special Collaboration between Elise Audio & Symphonium Audio
  • Limited to 50 Units Worldwide
  • 4 Balanced Armatures
  • Made of machined AL6061 Aluminium alloy
  • Hand-matched Panasonic and Vishay components
  • All pictures are PURELY indicative. The final faceplate design may slightly vary
Style: 4.4mm
Regular price
Regular price
Sale price
9% OFF

All our products ship from the UK. UK prices include local VAT. International orders will incur the destination's local taxes and duty charges.


Elise Audio has a standard 14-day return / exchange policy for electronic products (DAC/DAP):

  • Must be returned in like-new factory condition 
  • Must include all original packaging and accessories

Please note that the return shipping cost is to be paid by the customer.

Returning products that raise hygiene concerns - Products that have contact with the ear, nose or throat can only be returned for a full refund if sent back sealed and in unused condition. This applies all in-ear monitors.

If you are dissatisfied with your product please get in touch with us. We may be able to offer credit for another purchase (subject to inspection of the returned product) or to purchase the product back as used if we can dispose of the item as B stock. Please note the products would need to be inspected before any final offers are made but, as a guidance only, a 20% restocking fee will be applied on most in-ear monitors.

Custom made products - Products that have been custom made to the customer's specification cannot be returned for a refund or credit under this policy.

Read our full Returns, Warranty & Terms of service by clicking here


We offer a range of delivery options to suit your purchasing needs. The options are presented to you at the checkout, in an easy to understand way.

Most orders for In-Stock items are shipped within 1 to 3 business days (Monday to Friday, except bank holidays), subject to stock availability and security checks. Please ensure you provide a valid phone number for us to contact you should verification of your identity be required.

For More information about our Shipping Policy please click here

  • Royal Mail Tracked 24 and 48

    Providing a fully tracked service within the UK, with online tracking and customer and delivery notifications, this is the new normal in standard services.

  • Royal Mail Special Delivery - Next Business Day

Products purchased from Elise Audio are supplied with a manufacturer warranty that is specified on the product page on our website. Most products come with a 1Y manufacturer warranty (or 3 months for B-grade, open box, refurbished, ex-demo and second hand items).

The manufacturer's warranties are limited to physical defects in the materials, parts and workmanship used in making the product. Abnormal conditions, deliberate abuse and damage due to accidents, operator's error, or unauthorized service attempts are excluded from any warranty claims.

Faulty goods returned under the manufacturers warranty are to be returned to Elise Audio at the cost of the customer. Elise Audio will cover the cost of shipping the repaired or replacement product back to the customer.

Elise Audio x Symphonium  Helios SE

Elise Audio x Symphonium Helios SE


Elise Audio x Symphonium Helios SE

Style: 4.4mm

Updating a good product is risky. When it’s iconic, the challenge is even bigger. How do you produce a new impressive sound while retaining the original’s strengths? Such is our ambition with Helios SE.

Passion knows no borders. Helios SE is a celebration of our audiophile community, across continents.

Helios impressed with its unique technology and sound. The SE project started with two main objectives: add body to the lower frequencies and improve the fit.

Helios SE showcases talent and dedication. It is sonic excellence, fun and beauty. A product made for passionate audiophiles, by passionate audiophiles.

With Helios SE, we didn't just want to add bass. It was important to retain the Helios technical excellence.

The new signature adds versatility and caters to audiophiles who listen to a wide variety of music. Helios SE delivers impact, clarity and refinement. And it does so with a touch of fun.

So while bass was the main target, changes were implemented across the frequency response. This includes even more natural, sparkly treble.

The other main objective was to improve the fit. Symphonium developed a new, more ergonomic shell. The new shell has been thoroughly tested and will provide a comfortable fit for hours.

Helios SE is made of the same machined T6 AL6061 Aluminium alloy. This provides the maximum possible strength and hardness.

The colorful faceplate also makes a statement: Helios SE is fun, but it means business.

Featuring Filtered Linear Attenuation Tuning (FLAT) Technology, a proprietary circuit developed in-house with Subtonic, Helios SE will not be affected by impedence mismatch due to difference in source used. You will be able to listen to the same unimpeded sound regardless of the device you are using.

A great earphone deserves a cable of equal quality.

As such, each Helios SE comes with a new generation low impedance hand-built 26 AWG OCC Copper cable from Altalune Audio that has been carefully designed - down to the solder used - to provide the best listening experience possible.

By using a 4-way crossover, the sound frequencies can be separated into four different ranges. This allows to fine-tune each driver to precisely match the specifications needed to produce the best possible sound quality. Each driver's frequency response can be controlled and adjused, ensuring that every aspect of the audio spectrum is reproduced accurately and without distortion.

Perpetuating the collaboration tradition

Helios SE builds on the technological foundation developed by Symphonium, in collaboration with Subtonic. The technology was designed to disprove the stereotypes associated with multi-driver balanced armature earphones. Utilising ground breaking techniques, the balanced armature subwoofers produce exceptionally clean sub-bass punch that hits hard, yet does not colour vocal presentation. Tuned for a smooth and detailed midrange, Helios SE also features class-leading treble extension that pushes the limits of what balanced armature tweeters are capable of. The best just got better.

Hand Matched Components

We only use the highest quality Panasonic and Vishay components; they are further hand-matched to attain better channel matching.

AZLA Sedna Eartips

To squeeze out every bit of performance, Hellios SE comes with AZLA Sedna Earfit tips, for uncompromised listening experience.

Driver Count

4 Balanced Armatures


Custom Tuned True 4-Way Crossover with FLAT Technology

Outer Shell
Machined AL6061 Aluminium alloy
Frequency response
12Hz - 24kHz, ± 2 dB
104dB/Vrms @ 1 kHz
8.5 Ohms @ 1 kHz
Spring Loaded 0.78mm 2-Pin
Cable Details
26 AWG Pure OCC Copper
Cable Impedance
0.20 Ohms (2.5mm), 0.25 Ohms (3.5mm), 0.28 Ohms (4.4mm) @ 1kHz

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