SKU: 37638668774

Symphonium Audio Helios Earphone

$56250.00 $62500.00
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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18

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Description

Symphonium Audio Helios EarphoneTrueX 4 Way Crossover FLAT Technology Full Balanced Armature Design Tuned in Collaboration with Subtonic. Anodized AL6061 Aluminium Shell Azla Sednafit Standard and Sednafit Short Eartips 26AWG Altalune Nova in 4 Wire Configuration Available in 3. 5mm and 4. 4mm terminations Hand Crafted in Singapore The Technical Reference The Helios is a statement class product that represents a generational leap for us. Recognized for it's legendary technical

  • TrueX™ 4-Way Crossover 
  • FLAT™ Technology 
  • Full Balanced Armature Design
  • Tuned in Collaboration with Subtonic.
  • Anodized AL6061 Aluminium Shell 
  • Azla Sednafit Standard and Sednafit Short Eartips
  • 26AWG Altalune Nova in 4 Wire Configuration
  • Available in 3.5mm and 4.4mm terminations
  • Hand-Crafted in Singapore

The Technical Reference

The Helios is a statement class product that represents a generational leap for us.
Recognized for it's legendary technical ability, the Helios disproves the stereotypes commonly associated with multi-BA driver earphones. The Helios offers an exceptionally clean sub-bass punch that hits hard, without coloring the clarity of vocal presentations.

Tuned for a smooth and detailed midrange, the Helios also features class-leading treble extension that pushes the limits of balanced armature tweeters. We combined the best features from different monitors into one exceptional product.

Powered by an integrated TrueX™ 4-Way crossover and FLAT™ technology, the Helios is sure to impress with its dynamism and vigour and will deliver an unrivalled audio experience.

Tuned in Collaboration with Subtonic

Infinite Linearity

Featuring Filtered Linear Attenuation Tuning (FLAT™) Technology - a proprietary circuit developed in-house with Subtonic.

Working synergistically with Helios’s TrueX™ 4-way crossover, the Helios will not be affected by impedance 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.

Premium Cables

The Helios comes bundled with premium quality Altalune Audio Nova 26AWG Type 2 Litz OCC copper cables that are designed to deliver an exceptional listening experience with great ergonomics and low impedance.

Each cable is designed down to the finest details such as solder used and are completely hand built in Singapore.

Exceptionally Durable

Crafted from high-grade T6 heat-treated AL6061 Aluminium alloy, the Helios is engineered for durability and long-lasting performance. The T6 heat treatment significantly improves its strength, hardness, and durability while also enhancing its resistance to corrosion and fatigue. This gives the maximum possible strength and hardness for our IEMs, ensuring that the Helios can withstand even the most rigorous use.

Whether you're performing on stage or listening on the go, the Helios Earphone is built to last

TrueX™ 4-Way Crossover

By utilizing a true 4-way crossover, we are able to tune each driver to the exact specifications we require to achieve the best possible sound.

PrecisionMatch™

Each earphone undergoes rigorous channel matching and reference matching with PrecisionMatch™ technology to guarantee a superior listening experience.

Quality Eartips

To squeeze out every last bit of performance, the Helios comes with Azla Sednafit Standards for an uncompromised listening experience.

Specifications
  • Driver Crossover: TrueX™ Custom 4-Way Crossover with FLAT™ Technology
  • Frequency Response: 12Hz - 24kHz, ± 2 dB
  • Sensitivity: 104dB/Vrms @ 1 kHz
  • Impedance: 8.50 Ohms @ 1 kHz
  • Socket: Spring Loaded 0.78mm 2-Pin
  • Cable: 26 AWG Pure OCC Copper Litz Nova
  • Cable Impedance: 0.20 Ohms (2.5mm), 0.25 Ohms (3.5mm), 0.28 Ohms (4.4mm) @ 1kHz
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 37638668774

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4.6 ★★★★★
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Product Reviews
C
Verified Purchase
Charlie Horse 75
Boise, US
★★★★★ 5
Great fit!
Size: Large, Color: Beige
Most comfy undies THANK YOU!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
L
Verified Purchase
Lindsay
Grantham, US
★★★★★ 5
Love the "B00" Colors, but the "RX" colors are a totally different boyshort!!!!
Size: 3X-Large, Color: B004
The packs that have a color name starting with "B00" are fantastic! I bought the black and grey ones, and a set of the multi-colored ones, and they are the best boyshorts, ever!!! I attest to this now, after 6 months of everyday wear and wash. This first part of this review is only for boyshorts that have a color name starting with "B00"! Read the end for my review of the ones with a color that starts with "RX". Completely different panty. The B00 colors are sewn impeccably well, and they are a beautiful, quality material that resembles very thick, very soft leg stockings (panty hose). They stretch easily in every direction, so they hug your curves perfectly. These are not cotton! I hate cotton undies. These are nylon, or something synthetically similar. Unlike stockings, I think it would be very difficult to put a snag in the material because of how much thicker the material is than stockings. I actually tried to snag them with my torn finger nail just to see, but the material is very strong, so I could not put a run in them. Even though these are thick and soft, they dry remarkably fast, because of the looser weave of the synthetic material. They do not roll at all at the waist or on the legs, and I am a very curvy girl, so if they were going to roll, they would definitely roll on me. They wash very well. I've machine-washed them all weekly for 6 months now, and also tumble dried them on the low setting, at a laundromat. No issues at all with fading, color-bleed. shrinking, ravels, and no pilling. These are definitely my everyday undies. One really nice feature is that since these are tagless, they sewed a few raised lines of soft stitching in the back, so you'd always know where your rear-end goes. One thing some people may not like, is that there is no separate liner on the crotch. It is pretty much the same material as the rest of the panty, but a bit thicker, with an extra light layer of lighter-colored stitching incorporated into the inside of the fabric, to make it a bit more absorbent. I actually prefer this, because it means they dry faster, and they are less likely to fall apart in the gusset, but some people may prefer the extra liner of fabric that is typical for most undies. These are not binding at all, so not a shaper panty by any means, but they are certainly very comfortable and stay where you put them. I would think these would be fantastic for backpacking (I love backpacking!) for all the features I mentioned. I have micromodal boy shorts by meundies that I used to wear for hiking, but I will definitely wear these instead because of the reduced drying time after washing, or when sweating. The other micromodal bamboo/cotton-like materials just hold too much moisture for hiking. Undies that retain moisture can cause painful chafing, and can even contribute to hypothermia. I love these! I am buying more!! REVIEW UPDATE! Well, I did buy more. I bought the 5-pack of color that starts with "RX", and I was super disappointed! The "RX" ones are NOTHING like the "R00" ones I described above. Look closely at the pictures. Those ones with a different fabric panel on the hip are tight, not nearly as stretchy, roll instantly on my inner thighs, dip in the back, are not nearly as soft, and do not dry quickly. They are a completely different boyshort, and I do not like "RX" model of boyshort at all. I suppose if you had no meat on your thighs and you wanted a shaper-type panty, the "RX" might be exactly what you're looking for, but not for me, for sure.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2024
A
Verified Purchase
Ashley olson
Port Orchard, US
★★★★★ 5
Soft and comfortable
Size: Medium, Color: B005
Cute I must have a huge ass cuz they fit like short short underwear they do not cover my thighs like in the Pic and I got a medium I weight 145 and am 5'4" i can fit between and small and medium but I went a size up to a medium and they fit smaller then expected ill keep them cuz there stretchy and not tight but definitely fit short. Over all soft and comfortable material.
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Reviewed in the United States on February 5, 2026
N
Verified Purchase
Narissa
Massapequa, US
★★★★★ 5
Full Coverage
Size: Large, Color: B2207sp
They're nice and light, super stretchy, and not too tight around the edges. Im a size 14 and got a large amd They're a smidge tight, but I think if I would get an xl theyd fit perfectly, They're still comfy as is. One stipulation I had is I wanted them to cover my whole butt cheeks, nothing cutsie short cut, not for this. They cover my entire booty cheeks and stay there pretty well. Oh and also no camel toe! Id buy them again and would recommend them to anyone.
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Reviewed in the United States on December 15, 2025
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 4
Make sure you size up!!
Size: 4X-Large, Color: B004
Allllllmost 5 stars if the sizing was correct. I’ve been on the hunt for a decent fitting pair of women’s boxer briefs. I would say these are more so boyshorts. That being said, I wanted something loose for sleeping in so I got TWO sizes up. I normally go for a 2x and got a 4x and they’re perfect fitting. So, you didn’t get what I was looking for but did end up with some decent fitting undies. So I can’t complain too much. Just not the boxer briefs I was hoping for. Super stretchy and soft. Comfortable for sleeping in.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 3, 2026

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