Sonus faber Homage Amati G5 Loudspeaker Lab Report

Lab Report

The Amati G5 may be likened to an integrated sub/sat – the 150mm mid and 28mm DAD tweeter working into their own 'Intono' chamber (including a controlled vent for the mid) – while the two 220mm woofers fill-in the lower decade of bass (20Hz-200Hz/270Hz). The off-axis response of this hardworking 'mid/treble' duo is well controlled [see Graph 1, below], especially over the vertical axis where the slightly dished mid/presence output remains consistent ±20° above or below the main axis. This dip, and the eventual rise at 20kHz, results in response errors of ±3.1dB and ±3.0dB, respectively, although Sonus faber's QC ensures the pair matching remains a tight 0.7dB (ignoring a narrowband 1.6dB error at the 2.2kHz crossover). It also diminishes the sensitivity from its 'peak' of 91.9dB/1kHz – better still than Sonus faber's claimed 91dB – to 89.3dB when averaged between 500Hz-8kHz. The response is otherwise very 'smooth' but note a slight discontinuity at the 2.2kHz crossover, and +40° peak in impedance phase, revealed as a resonance on the CSD waterfall [see Graph 2]. The elastic 'wire' grille introduces mild HF effects only [blue trace, Graph 1].

The lower woofer rolls off a little earlier than the upper bass unit (49Hz-220Hz vs. 49Hz-280Hz, re. –6dB) but they combine with the 32Hz port tuning (note strong quarterwave mode at 128Hz – see green shaded area, Graph 1) to yield a corrected bass extension of 36Hz (–6dB re. 200Hz). However, deep bass and high sensitivity is bought at the expense of a tougher load than has been typical of past Sonus faber speakers, so the Amati G5 fully warrants its 4ohm nominal rating. PM


Response inc. nearfield summed drivers/ports [green], freefield corrected to 1m at 2.83V [yellow], ultrasonic [pink]. Left, black; right, red; w. grille, blue

Sonus faber Amati G5_Left_Waterfall 35dB

There is one mode at the 2.2kHz crossover [also visible on Graph 1] but DAD tweeter is 'clean'

Sensitivity (SPL/1m/2.83V – 1kHz/Mean/IEC) 91.9dB / 89.3dB / 88.1dB
Impedance modulus: minimum & maximum (20Hz–20kHz) 2.36ohm @ 93Hz, 25.7ohm @ 24Hz
Impedance phase: minimum & maximum (20Hz–20kHz) –74° @ 57.6Hz, +42.8° @ 20Hz
Pair matching/Resp. error (200Hz–20kHz) 1.5dB/ ±3.1dB/±3.0dB
LF/HF extension (–6dB ref 200Hz/10kHz) 36Hz / 42.9kHz/40.2kHz
THD 100Hz/1kHz/10kHz (for 90dB SPL/1m) 0.35% / 0.35% / 0.7%
Dimensions (HWD) / Weight (each) 1176x411x512mm / 56kg
Price £30,000

Sonus faber SpA (Fine Sounds Group)
Supplied by: Fine Sounds UK
07714 232033