System Audio Legend 40.2 Silverback Loudspeaker Lab Report

Lab Report

Tested here without any 'RAM Tweaks' this active version of the Legend 40.2 employs the same cabinet and trio of 135mm carbon-fibre reinforced bass and mid units, but with the rear-facing reflex port internally 'shorted' to yield a 2nd-order sealed-box bass alignment. Incidentally, there's a ~27msec latency on the analogue input... Meanwhile, the two lower woofers are driven in parallel from one TI Class D amp, delivering a –6dB bandpass of 45Hz-250Hz while the upper mid/woofer extends over a far wider 25Hz-2.9kHz (–6dB re. 200Hz). Thanks to SA's actively-tailored bass, the diffraction-corrected LF extension (–6dB re. 200Hz) is far lower at 31Hz [green shaded area, Graph 1] than the 50Hz we saw in the passive Legend 40 [HFN Aug '20]. Distortion is also reduced to <0.25% through bass and midrange at 90dB SPL but increases closer to the Legend 40's 1% once the DXT tweeter takes over.

The forward response, measured just above the cabinet at the likely listening axis, is not especially uniform but follows the uptilted presence/treble trend of the Legend 40, its HF response extending out to 34kHz (–6dB re. 10kHz) following a +3.0dB peak at 22.5kHz. There is a ~3dB dip at 1.5kHz here, seen closer to 1.2kHz in the Legend 40 and suggesting the mid/treble crossover has been adapted, together with a 'new' ~3dB reinforcement at 6kHz that skews the response uniformity to ±3.1dB and ±3.3dB, respectively. Pair-matching, again, was a slightly poor 2.2dB as one of our speakers possessed a higher 2kHz-20kHz output than the other [black/red traces, Graph 1].

The effect of the grille [blue trace, Graph 1] is to diminish the presence output, while the ±6dB gain settings do just what they say [grey traces]. On both speakers, there is some fine structure in the response between 3-5kHz that's also reflected in a persistent but low-level resonance seen on the CSD waterfall [Graph 2, below] – and also the Legend 40 before it. PM


Response inc. corrected nearfield <200Hz [green], freefield corrected to 1m [yellow], ultrasonic [pink]. Left speaker, black (with grille, blue); right speaker, red; ±6dB settings, grey (from 400Hz)


Resonances typically decay quickly here with low-level modes remaining at 1-2kHz and 3-5kHz

Pair matching/Resp. error (200Hz–20kHz) 2.2dB/ ±3.1dB/±3.3dB
LF/HF extension (–6dB ref 200Hz/10kHz) 31Hz / 34.1kHz/33.4kHz
THD 100Hz/1kHz/10kHz (for 90dB SPL/1m) 0.2% / 0.1% / 0.9%
Dimensions (HWD) / Weight (each) 955x190x265mm / 19.4kg
Price £4500

System Audio A/S
Supplied by: Karma-AV Ltd, York
01423 358846