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Cameron Oatley
ExtremeHiFi
Website author headshot
Julian Shapiro
ExtremeHiFi

Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.

What reviewers think

Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.

What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.

All

Unity Stage IEMs

reviews

[{"title":"Plunge Audio Unity Review - One Of A Kind","link":"https://www.youtube.com/watch?v=i5RZ_ojPTuc","source":"Praised Audio","datePublished":"2025"},{"title":"Plunge Audio, Unity Dynamic IEM review. My favorite gaming IEM so far!","link":"https://www.youtube.com/watch?v=cIpKln3_ivA","source":"Tone Deaf Monk","datePublished":""}]
An excellent review of a great product
/
Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022

Manufacturer details

  • Impedance: 36ohms @ 1kHz
  • Sensitivity: 94dBSPL @1kHz 250mVRmS
  • Frequency Response: 10Hz - 20kHz
  • Attenuation: -28dB
  • Drivers: 4x Sonion Balanced Armature (1x dual high mids/highs, 1x dual bass/low mids)
  • Open Acoustic Mass Nozzle: 0.15cc volume
  • Cable Conductor: Silver plated copper with 80 core OFC copper shielding
  • Cable Specification: 4core coaxial cable, 0.78mm 2pin connector, 3.5mm plug
  • Cable Length: 1.3m (51")
Unity Stage are anatomically coherent, universal-fit IEMs offering a custom-like seal and fit. Featuring a quad-driver tubeless, damper-less design with an open-acoustic mass nozzle, they deliver an ultra-wide, immersive 3D soundstage.
Manufacturer Site

Brand highlights

Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:

Unity Dynamic IEM

  • Position: A cost-effective IEM that brings dynamic driver technology into Plunge Audio's lineup.
  • Description: Features a proprietary tuning method with a dynamic driver that delivers deep bass, balanced mids, and extended highs through a tubeless, damper-less design. Compared to the Unity Stage IEM and the Signature Series, it prioritizes affordability and studio-suitable clarity for users with limited budgets and straightforward functionality needs.

Unity IEM

  • Position: A mid-range IEM offering a universal, custom-like fit with advanced quad-driver performance.
  • Description: Uses a patented shell design and quad-driver tubeless, damper-less construction to create an expansive and natural soundstage with precise imaging. In contrast to the more budget-friendly Dynamic model and the exclusive Signature Series, it provides enhanced sonic detail and a well-balanced sound.

Signature Series

  • Position: An ultra-premium, one-of-a-kind series crafted by Simon Fisk for the most discerning users.
  • Description: These IEMs merge artisanal design with expert sonic tuning, using premium materials like stainless steel or exotic wood and bespoke adjustments that are unique to each creation. Compared to both Unity models, the Signature Series offers a tailored listening experience with exclusive aesthetics and functionality.
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Avg. Product Price
$501-$1,000
Used For Sale
0
 Available (Scroll Down)
Brand Popularity
846
 of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
5
Founding Year
2005

Our take on the brand

Plunge Audio is a hifi headphone brand that rejects driver count marketing in favor of tubeless, damper-less acoustic paths designed to create a distinct "on-stage" spatial perspective that positions listeners within the band rather than in the audience.

Look inside the brand

Brand Page

Our interview with the brand

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What if you spend more?

Product image
Dali
IO-12
1300
1300
/
21
Reviews
DALI is a speaker brand known for its unique hybrid tweeter module that combines a soft dome and planar ribbon tweeter, along with proprietary Soft Magnetic Compound technology that reduces distortion. Their speakers feature distinctive wood fiber cones and are designed to be used without toe-in, which creates a broader, more even spread of sound across the listening area.
Check Amazon
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Product Strengths

  • Incredible sound quality, with neutrality, detail, and balance across the frequency range
  • Excellent build quality with premium materials and comfortable, luxurious design, making them suitable for extended listening sessions
  • Adequate battery life, with reviewers reporting around 35 hours of wireless playback with ANC
  • Effective active noise cancellation reduces low-frequency sounds without significantly impacting sound quality
  • Versatile connectivity options including Bluetooth, USB-C for high-resolution audio, and a 3.5mm analog input that can be used passively

Product Considerations

  • High price point puts them out of reach for many consumers
  • Lack of a companion app limits customization options like EQ settings, firmware updates via mobile, and custom control settings
  • Large earcups and overall weight may not be suitable for those with smaller heads, and the headband may slip
  • Included travel case is large
  • Some reviewers found the dark chocolate color scheme unappealing

Comparisons (according to reviewers)

  • The DALI IO-12 has better ANC than the Focal Bathys
  • The IO-12 is similar in sound signature to the Mark Levinson No. 5909

Takeaway: The DALI IO-12 is a high-end wireless headphone that delivers exceptional sound quality, comfort, and versatility, making it a great choice for audiophiles who want a premium listening experience on the go. Its blend of wired and wireless capabilities, combined with a mature design, makes it an excellent all-around performer.

Video review

Our take on the brand

DALI is a speaker brand known for its unique hybrid tweeter module that combines a soft dome and planar ribbon tweeter, along with proprietary Soft Magnetic Compound technology that reduces distortion. Their speakers feature distinctive wood fiber cones and are designed to be used without toe-in, which creates a broader, more even spread of sound across the listening area.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer
Product Page
Product Page
Product image
T+A
Solitaire T
1700
1700
/
17
Reviews

From the first day the Solitaire T was developed with a single goal in mind: to blur the distinctions between audiophile, working and travel headphones by making the values and convictions which are the hallmark of every T+A product accessible in almost every situation in life. 

Their transducer system is a completely new development, capable of reproducing the most subtle nuances in audiophile quality in active and passive mode alike, while the passive insulation on its own is sufficient to push the outside world into the background. When combined with active background noise suppression, which can be switched on as required, unwanted sounds disappear completely behind the music. 

The pearl-blasted aluminium components are machined from solid, and are much more than a design statement: they are so robust and durable that they ensure the headphones will remain their owner's companion for years. At the same time they emphasise in a subtle but distinctive manner the product's close relationship with our Solitaire P reference headphones. 

Like its physical design, the Solitaire T's inputs are designed with one aspect in mind: versatility. The Solitaire T places no restrictions on its user, as they feature signal transfer via totally symmetrical passive and active analogue inputs as well as USB C and the very highest-quality wireless Bluetooth standards; the design maximises the potential of every imaginable music source.

T+A is a hifi brand that combines transistor and valve technologies in their HV-Series amplifiers, using high voltage for linear performance, while their A 200 Power Amplifier uses PURIFI Eigentakt technology for low distortion regardless of speaker load.
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Expand Details

Product Strengths

  • Impressive sound quality bridges the gap between wired and wireless performance
  • It is a versatile product that can be used as a passive headphone, a USB DAC, or a Bluetooth headphone
  • High build quality, with premium materials like milled aluminum contributing to a robust and luxurious feel
  • Comfortable to wear for extended periods
  • Long battery life, especially in standard mode—up to 70 hours

Product Considerations

  • The fit may not be ideal for those with wider heads
  • The treble response could be sweeter
  • The active noise cancellation may not be class-leading compared to some competitors
  • The volume in wireless mode may not be loud enough for some listeners
  • Soundstage presentation feels intimate compared to full-sized reference headphones

Comparisons (according to reviewers)

  • Vs Mark Levinson No.5909: The Solitaire T has more detail and better organization, though the No. 5909 has a bigger, more spacious presentation
  • Vs Bowers & Wilkins PX8: The noise cancelling of the PX8 is better
  • Vs Focal Celestee: The Solitaire T is comparable when used as a passive wired headphone

Takeaway: The T+A Solitaire T is a versatile and well-built headphone that offers high-quality sound in both wired and wireless modes, making it a great choice for audiophiles on the go or those who want one set of headphones for all situations. Listeners can enjoy music in a lot of different ways with these, and they sound very good.

Video review

Our take on the brand

T+A is a hifi brand that combines transistor and valve technologies in their HV-Series amplifiers, using high voltage for linear performance, while their A 200 Power Amplifier uses PURIFI Eigentakt technology for low distortion regardless of speaker load.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer
Product Page
Product Page
Product image
Dan Clark Audio
E3
1999
1999
/
12
Reviews
Dan Clark Audio sets itself apart with its patented Acoustic Metamaterial Tuning System, which uses waveguides and resonators to shape frequency response to uniquely close adherence to various targets, and a unique tensioning system that ensures consistent performance across their headphone units. Their summit-tier headphones feature an uncommon folding design for portability, and their self-adjusting headbands offer extended comfort during long listening sessions.
Check Amazon
Expand Details

Our summary

Product Strengths

  • Musical sound signature that is fun to listen to, making the experience pleasurable without covering up flaws in recordings
  • Soundstage is expansive and three-dimensional, behaving more like an open-back than a closed-back headphone
  • Excellent comfort with effective clamp pressure and gushy, cushy, supple pads allowing for all-day wearability
  • Bass presence is excellent and extends nicely into the sub-bass with slam when needed
  • New 5th generation driver delivers a smooth, rich, and detailed experience
  • Proprietary connectors for the headphone cable mean that a separate cable may need to be purchased for use with other devices

Product Considerations

  • Aesthetics may not appeal to everyone, particularly the honeycomb pattern and blue text on the earcups
  • Significant amping is required to achieve its full potential, not ideal for portable use without a dedicated amplifier
  • Treble is completely unveiled and may get splashy or fatiguing on the wrong set of ears, so auditioning is recommended
  • Headphone pads are glued in and not easily replaceable

Comparisons (according to reviewers)

  • Vs Dan Clark Audio Stealth—E3 sounds significantly better with better image separation and clarity
  • Vs Dan Clark Audio Expanse—E3 offers better separation between sounds, micro-contrast, and detail, Expanse has more tactile bass
  • Vs Dan Clark Audio ETHER C Flow—E3 is an upgrade with a mellower, sweeter midrange, and tighter bottom end
  • Vs Meze Elite—E3 is as fast in detail retrieval

Takeaway: The Dan Clark Audio E3 is a well-rounded closed-back headphone that provides a fun and engaging listening experience with great comfort. It is a solid choice for those seeking a musical sound signature and excellent detail retrieval in a closed-back design.

Video review

Our take on the brand

Dan Clark Audio sets itself apart with its patented Acoustic Metamaterial Tuning System, which uses waveguides and resonators to shape frequency response to uniquely close adherence to various targets, and a unique tensioning system that ensures consistent performance across their headphone units. Their summit-tier headphones feature an uncommon folding design for portability, and their self-adjusting headbands offer extended comfort during long listening sessions.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer
Product Page
Product Page
Product image
HEDD
HEDDphone TWO
1999
1999
/
11
Reviews
HEDD Audio, founded by physicist Klaus Heinz, pioneered Air Motion Transformer (AMT) technology. Typically reserved for tweeters only due to difficulty achieving low frequency output, HEDD was the first to achieve full 20hz-20khz in a headphone design with the HEDDphone, later refined and improved with the HEDDphone 2 and 2 GT. The brand hand-builds their products in Berlin, with their headphones particularly noted for exceptional detail retrieval and natural soundstage, making them suitable for both professional and audiophile use.
Check Amazon
Expand Details

Product Strengths

  • Improved ergonomics and comfort compared to the original HEDDphone, largely due to a significant weight reduction and the innovative HEDDband system for adjustable fit
  • Highly detailed and resolving sound, particularly in the midrange, with excellent timbral resolution and microdynamic control
  • Unique and expansive soundstage that doesn't restrict the sonic image to inside the head, resembling a good pair of speakers in a well-tuned room
  • High-quality build with premium materials and a 5-year warranty inspires confidence
  • Excellent accessory package including a carrying case, spare earpads, and multiple cable options

Product Considerations

  • Can be picky with recording quality, performing best with well-recorded tracks and less impressive with lower-quality productions
  • Some reviewers find the clamping force of the headband to be too strong, even on the lowest setting
  • Bass response may lack sub-bass extension or 'oomph' for some listeners, especially those craving a strong low-end rumble
  • The treble might be perceived as bright or sibilant by some listeners, particularly due to an elevation in the upper treble region

Comparisons (according to reviewers)

  • Vs HEDDphone One: The Two is lighter, more comfortable, and has a more neutral and technical sound, while the original has more bass impact and a unique timbre
  • Vs Audeze MM-500: Both are aimed at professionals with a neutral tuning, but the HEDDphone Two has greater technical performance, microdynamic control, and detail retrieval
  • Vs Sennheiser HD800S: The HD800S has a greater sense of soundstage, openness, and instrument separation, while the HEDDphone Two has better low-level detail for individual instruments and microdynamics
  • Vs HIFIMAN Arya: The Arya has more midbass punch and upper treble energy, while the HEDDphone Two offers greater technical performance
  • Vs Meze Elite: The Elite offers a more rich and entertaining signature, where the HEDDphone Two is more neutral and reference-like

Takeaway: The HEDDphone Two is an innovative headphone with impressive sound and design, offering improvements over the original and it is worth buying if one is looking for excellent sound quality and detail. While its aesthetics may not be its strongest attribute, it delivers on technical sound and offers an enjoyable listening experience.

Video review

Our take on the brand

HEDD Audio, founded by physicist Klaus Heinz, pioneered Air Motion Transformer (AMT) technology. Typically reserved for tweeters only due to difficulty achieving low frequency output, HEDD was the first to achieve full 20hz-20khz in a headphone design with the HEDDphone, later refined and improved with the HEDDphone 2 and 2 GT. The brand hand-builds their products in Berlin, with their headphones particularly noted for exceptional detail retrieval and natural soundstage, making them suitable for both professional and audiophile use.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer
Product Page
Product Page

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