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  • Jan 05, 2026
  • By marcelzxc
  • 0 comments

EarAcoustic SPA High-End: The Most Special Material Used for the Diaphragm

Reviewed by marcelzxc
Source: HEAD-FI
Pros: 
– Aesthetically beautiful (subjective)
– Luxurious-looking design
– Unboxing experience
– “Analog” sound
– Neutral tuning with bass boost
– Good with older recordings
– Good imaging
– Easy to push
– Great fit and comfort
– Good cable
– Good eartips
– Great case
– Freebie: Wristband
Cons: 
– Price (big competitors in this range)
– Could have more eartips (variety)
– Cable heavier and thicker than I would like (subjective)
– Earhooks too curved (but not a problem)
– Not a very wide soundstage
– Slightly muffled bass
– Technicality isn’t the strongest point

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40% OFF Shopping link: KEEPHIFI
INTRO:

EarAcoustic is a newcomer to our audio community, but it already has a well-known past, as it is a sister company to the former TFZ – The Fragrant Zither. When I joined in the hobby, TFZ was one of the most well-known brands.

The SPA line has seven different models: SPA Pro; SPA Pro Ultra; SPA Pro Max; SPA High-End; SPA High-End Ultra; SPA High-End Max; and SPA Limited Edition.

The edition we’ll be reviewing today is the SPA High-End(40% off).

Price: $149,90 USD
Color: Silver
Cable: Without Mic


SPECIFICATIONS:

Single DD:

  • (1) Dynamic Driver (DD) 11mm
– Frequency: 5Hz – 40kHz
– Effective frequency: 20Hz – 20kHz
– Impedance: 23Ω
– Sensitivity: 111dB
– THD: <0.5%
– Termination plug: 3.5mm
– Connectors: 2pin 0.78mm (detachable)
– Cable size: 1.2m
– Cable: Silver-Plated Copper OFC
– Shell: 3D resin with matte silver spraying
– IEM weight: 5.4g (one side)(without eartips)
– Cable weight: 37.6g
– Total weight (packaging, iems, etc): 342g
– Packaging size: 12cm [H] x 12cm [W] x 12cm [D]


UNBOXING:


PHYSICAL ASPECTS:

Construction:

  • The shell is made of 3D resin.
  • Semi-custom design (pre-molded).
  • Aesthetically appealing (luxurious look).
  • Has two vents (ventilation holes).
  • Great build quality.
  • Great unboxing experience. Premium feelings.
  • Good number of accessories.
  • Great case. Rigid. Zipper closure.

Eartips:

  • There are two types: Normal (standard) and Wide Bore.
  • Sizes S/M/L.
  • Standard size; if you use M, then it’s M.
  • They’re good eartips, but generic.
  • For the price, there could be 3 or 4 options (variety).
  • I don’t see the need to buy more eartips (subjective).
  • I don’t usually use Wide Bore eartips.
  • I tested with the “normal” ones [size M].

Cable:

  • Silver-plated cable, aesthetically very nice.
  • The cable is thicker than I’d like, but isn’t a problem.
  • The cable is heavier than I’d like, but isn’t a problem.
  • Good/medium malleability.
  • Doesn’t get tangled.
  • Doesn’t get “memory” (creases).
  • No microphonics.
  • The earhooks have the coating I prefer, without wavys.
  • At first, I found the curvature strange, but in use, they’re fine (earhooks).
  • Chin Slider with few to no function.
  • 2-pin 0.78mm connectors.



Fit and comfort:

  • Good fit – stable in the ears (subjective).
  • Very comfortable. Excellent ergonomics.
  • Good for medium to large ears.
  • Semi-custom design is 8 or 80 (good for some, bad for others).
  • Medium insertion.
  • Great isolation.
  • Quite lightweight, 5.4g.
  • Good for long listening times.
  • Reminds the design of the Celest Wyvern Abyss or Qing.


Earphone kit (accessories):

  • SPA High-End earphones.
  • 7 pairs of eartips (S/M/L).
  • Cable.
  • Carrying case.
  • Bracelet with pendant.
  • Manual.

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SOUND ASPECTS:

Sound:

  • Neutral with an emphasis on bass.
  • More present mid-bass, slightly forward upper-mid, and discreet treble.
  • “Analog” sound. Good with older recordings.
  • Music from the 80s, 70s, or earlier had a better match.
  • Good for recordings with less sub-bass or treble.
  • Technicalities aren’t the strongest point (for the price).
  • Big competitors in the $149 USD price range.
  • In this price range or less, there are the Supermix4, Quatio, NA20, EA500LM, Titan S2, etc.
  • From the products I’ve tested, $99 USD for the SPA High-End would be good (in my opinion).


Bass:

– Quantitative:

  • Moderate to high.
  • Not for bassheads.
  • Greater emphasis on the mid-bass.
  • Sub-bass is present, but not dominant.
  • Slight overlap of the mid-bass with the subs.

– Qualitative:

  • The bass is full-bodied, filled, with good physicality, texture, and extension.
  • They have a more slack, expansive character.
  • The definition is good/ok (for the price, it’s below other IEMs).
  • Sometimes, the bass sounds slightly muffled.
  • For example, a kick drum with a pad inside makes the sound softer.
  • The impact is more “softened.”
  • They don’t invade the midrange.
  • The bass has fun and pair well with older recordings.
  • The bass isn’t overly warm; the reduced subs make the sound less warm.
  • Good for more acoustic instruments or recordings from the 80s, 70s, or earlier.



Mids:

– Quantitative and qualitative:

  • The mids are a bit recessed and the upper-mids are more forward.
  • Pinna gain is well-placed. Coherent.
  • The upper-mids bring clarity just right.
  • I didn’t experience any hearing fatigue in this region.
  • I have more sensitivity in this region and didn’t experience any fatigue.
  • The definition is good/ok (for the price, it’s below other IEMs).
  • I didn’t heard any harshness in any instrument.
  • I didn’t heard harshness in any recording I listened to.
  • I think it could have a little more airy.



Voices:

  • Good performance for both high and low voice types.
  • Low-pitched male voices have a commanding presence.
  • High-pitched female voices have clarity and good projection, without exaggeration.
  • The IEM provide a good balance for both vocal types.
  • Good for both, but not excellent for one specific type.


Treble:

– Quantitative:

  • Moderate to low treble.
  • Not for trebleheads.
  • Recommended for those sensitive to treble.
  • No hearing fatigue.
  • Nothing I heard was overdone.

– Qualitative:

  • The treble are smooth, soft, controlled, and well-defined.
  • I felt a slight roll-off in the higher treble.
  • Natural sparkle. Coherent.
  • Good detailing.
  • Could have more airy.
  • They’re not shrill, sharp, or harsh.
  • I didn’t experience any sibilance, peaks, or coloration.
  • Good for recordings where the treble aren’t the main focus.
  • I don’t consider the SPA High-End to be energetic.
  • Chimes and bells, everything I heard was smooth.
  • Ride cymbals sound natural, without any sharpness.

Soundstage:

  • I found the soundstage to be average.
  • Forward upper-mids diminish the sense of depth.
  • The soundstage is average in height, width, and depth.
  • It plays everything without sounding closed.

Imaging:

  • Good instrumental separation. Positive point.
  • The IEM have separation between bass and treble, which helps with identification.
  • Hybrid IEMs generally have a better advantage here (not a rule).

Driver Flex Test:

  • I didn’t experience any driver flex when inserting the IEMs into my ears.


Amplification:

  • Easy to push.
  • No need powerful amplifier.
  • A simple dongle is enough.
  • I used the SPA High-End with the FiiO KA11.
  • Dongle connected to the computer.
  • It will play well directly from smartphones or iPads.
  • Volume below 20 (of the 100 available on the W10).

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