ELAC Uni-Fi Reference UBR62 Bookshelf Speaker Review || Soundstage Matters

Product reviewed

ELAC Uni-Fi Reference UBR62 — new bookshelf speaker (pair), released recently at about $1,000/pair.

Overall listening experience (subjective)

• Listening done in a living room; speaker levels typically ~80 dB up to upper 80s/low 90s maximum, sometimes “as loud as comfortable,” including near-field in mono.
• Biggest strength: exceptional soundstage
  • Very wide with excellent depth/3D imaging.
• Tonality is described as very good (no major “don’t buy it” tonal flaw).
• Main areas lacking:
  • Low-bass / “grunt” (less impact than desired)
  • Overall sensitivity (requires more amplifier power than typical bookshelf speakers)

Key technical / measurable observations (data takeaways)

• Sensitivity is low: about 83.3 dB mean (anechoic reference).
  • Compared to typical single-mid-bookshelf speakers around ~85 dB @ 2.83V/1m, this is a disadvantage.
  • Practical implication: the reviewer needed a more powerful amplifier to reach satisfying levels.
• Impedance / amp load
  • Nominal impedance around ~5 ohms, dipping to about 4 ohms around ~50 Hz.
  • Reviewer view: an amp that can handle 4–5 ohms is “okay.”
• Bass extension / impact
  • Reviewer felt it lacks low-end “grunt.”
  • Measurements suggest reduced bass output/extension relative to what they wanted.
• Midrange resonance / “honking” character
  • Subjectively noticed extra character in female vocals.
  • Measurements indicate a broad peak ~500–700 Hz around ~2–3 dB, which may match that impression.
  • Also mentions additional response irregularities (including a possible issue region around ~250 Hz), though that part is more anecdotal.
• Off-axis / radiation behavior supports the soundstage claim
  • Estimated/observed wide radiation pattern roughly ~60° consistently up to about ~8 kHz, where the tweeter starts beaming.
  • Unusual for concentric/coaxial designs, which often show narrower radiation patterns.

Pros (unique points mentioned)

• Remarkable wide + deep soundstage (3D imaging).
• Wide horizontal and vertical listening window
  • Reviewer suggests a sweet spot of roughly ±10° horizontally/vertically and encourages experimenting with toe-in/tilt.
• Controlled distortion / damping
  • Mentions no out-of-band resonances and no midrange breakup evident in measurements.
• Design choices to reduce diffraction
  • Curved baffle and curved/concentric driver geometry aimed at minimizing diffraction effects.
• In-room response target seems mostly achieved
  • Despite uneven on-axis response, the reviewer believes in-room response is comparatively neutral, aligning with what they heard.

Cons (unique points mentioned)

• Low sensitivity → needs a stronger amplifier than many bookshelf speakers.
• Not enough low-bass “grunt” / less extended bass than desired.
• Vocal “honking” / resonance area
  • Likely tied to the ~500–700 Hz peak (plus possible other mid-bass concerns).
• On-axis response isn’t flat
  • Includes dips/peaks typical of concentric designs.
• Tonal trade-off risk from wide dispersion
  • Wide radiation can increase side-wall reflections, potentially making high frequencies sound flatter/possibly brighter than ideal (though the reviewer personally didn’t find it too bright).

Comparisons made

• Compared against typical bookshelf speakers and typical concentric behavior:
  • Typical single-mid bookshelf sensitivity ~85 dB vs 83.3 dB here.
  • Many tested concentric speakers tend to have narrower soundstages/radiation; this model is described as unusually wide.
  • The reviewer favors wide soundstage (vs narrower) and says this design matches that preference.

Ratings / numerical scores

• Sensitivity: ~83.3 dB mean (anechoic).
• Output/linearity vs level (compression/linearity behavior)
  • At 76 dB @ 1m, increasing to 86 dB yields minimal output change (about ~0.4 dB difference).
  • At 96 dB @ 1m, control is still fairly good, but more compression/reduced linearity appears at higher output.
  • At ~102 dB @ 1m, the reviewer believes the speaker is being pushed beyond what it needs, with more significant compression/limitations.
• Impedance: nominal around ~5 ohms, dipping to about 4 ohms near ~50 Hz.
• Soundstage-related dispersion estimate: about ~60° wide up to roughly 8 kHz.

Verdict / recommendation

Recommended if you prioritize soundstage width/depth and can provide adequate amplification.

If you specifically want more bass impact and/or you often listen at high volume with a lower-powered amp, the low sensitivity and limited low-end “grunt” may be deal-breakers.

Speaker-specific points by the reviewer (unique themes consolidated)

• Subjective
  • Outstanding soundstage (width + depth)
  • Good overall tonality
  • Vocals show mild “honking” character
• Technical
  • Low sensitivity (83.3 dB) → needs more amp power
  • Impedance dips to ~4Ω
  • Midrange peak ~500–700 Hz
  • Wide dispersion (~60°) supports the listening impression
  • Curved baffle intended to reduce diffraction
  • No out-of-band resonances/breakup measured
• Measurement-to-listening interpretation
  • Despite on-axis irregularities, the reviewer’s focus is in-room response.
  • They recommend not listening dead-on.

Speakers / contributors

• Only the main reviewer (Aaron, “Aaron’s Audio Corner / Soundstage Matters”) is present in the provided subtitles.