Vinnie Rossi L2i-SE Integrated Amp/DAC Lab Report

Lab Report

Tested without the 300Bs in-circuit, the L2i-SE put in a sterling performance. Power output is comfortably higher than its 100W/ 8ohm rated specification at 2x130W/8ohm and 2x210W/4ohm and there's sufficient in reserve to accommodate 180W, 333W and 234W into 8, 4 and 2ohm loads, respectively, under dynamic conditions [see Graph 1, below]. Power is limited to 128W/1ohm (or 11.3A). Distortion trends downwards with increasing output from ~0.01%/1W to 0.009%/10W and 0.0055% at the rated 100W (all re. 1kHz/8ohm) but increases at higher frequency from 0.1%/10kHz to 0.2%/20kHz (all re. 10W/8ohm). Gain is low at +24.1dB, but ideally suited for use with 2V line output sources, and the S/N is fabulously wide at 96.5dB. The response shows a subsonic roll-off of –0.1dB/20Hz and –6dB/2Hz while extending out to –0.1dB/ 20kHz and –1.0dB/100kHz.

Measured via its balanced preamp, VR's AKM AK4497-based DAC stage offers a maximum 4.6V output, and 108dB S/N ratio, from a low 25ohm source impedance. An acceptable ~125psec jitter rejection is achieved (all sample rates) while distortion falls to a minimum of 0.00035%/1kHz and 0.00055%/20kHz over the top 30dB of its dynamic range [see Graph 2], albeit peaking at 0.1-0.15% over the top 10dB. The default NOS filter offers responses of –5.0dB/20kHz, –5.4dB/45kHz and –6.9dB/90kHz with 48kHz, 96kHz and 192kHz files, respectively, trading a very limited alias rejection for zero time distortion. The minimum phase filter offers a superior 70dB image suppression and flatter –1.8dB/20kHz, –2.7dB/45kHz and –4.1dB/90kHz responses. PM


Dynamic power output versus distortion into 8ohm (black trace), 4ohm (red), 2ohm (blue) and 1ohm (green) speaker loads. Max. current is 11.3A


Distortion versus 24-bit digital signal level over a 120dB range at 1kHz (black) and 20kHz (blue)

Continuous power (<1% THD, 8/4ohm) 130W / 210W
Dynamic power (<1% THD, 8/4/2/1ohm) 180W / 333W / 234W / 128W
Output impedance (20Hz–20kHz) 0.01–0.019ohm (25ohm, pre)
Freq. resp. (20Hz–20kHz/100kHz) +0.0dB to –0.1dB/–1.05dB
Digital jitter (48kHz/96kHz) 125psec / 125psec
A-wtd S/N ratio (re. 0dBW/0dBFs) 96.5dB (Analogue) / 108.0dB (Dig)
Distortion (20Hz-20kHz; 10W/–3dBFs) 0.0004–0.15% / 0.105–0.11%
Power consumption (idle/rated o/p) 88W / 460W
Dimensions (WHD) / Weight 438x222x368mm / 23kg
Price £18,995 (£25,985 with phono and DAC modules)

Vinnie Rossi
Holden, MA, USA
Supplied by: Elite Audio Ltd, Fife
01334 570 666