Big‑system muscle in a half‑size chassis.
The Rialto 400 packs a 100 W‑per‑channel Class AB amp, a Wolfson® hi‑fi DAC, and Audiocontrol’s AccuBASS® processing into a case small enough to hide behind a bookshelf speaker. Whether you’re juicing a pair of towers, driving outdoor speakers, or giving your Sonos/HEOS zone a serious upgrade, Rialto delivers velvet mids, iron‑fisted bass, and 24‑bit/192 kHz clarity—all backed by Skadi’s 1‑year warranty.

Key reasons you’ll love it

Serious power – 100 W × 2 @ 8 Ω, 200 W × 2 @ 4 Ω, or 400 W bridged mono for sub duty. AudioControl Pro
Wolfson WM8740 DAC handles 16/24‑bit PCM up to 192 kHz for ultra‑low noise. AudioControl Pro
Smart input‑priority switching – Optical, coax, RCA, or speaker‑level with signal‑sense auto‑wake—ideal for voice devices like Alexa / Google Home. AudioControl Pro
Dedicated subwoofer pre‑out plus AccuBASS® to restore low‑end punch at low volume. AudioControl Pro
Tiny footprint – only 8.5 ″ W × 5.4 ″ D × 2.9 ″ H, weighs 2.7 kg. AudioControl Pro
Built in the USA & designed for 24/7 custom‑install reliability; 5‑year manufacturer warranty (Skadi adds 1 year on refurbished units). AudioControl Pro

What’s in the box

Rialto 400 amplifier (factory‑refurbished)
Power cord (North‑American)
Quick‑start sheet

(Skadi repacks each unit with recyclable foam inserts; carton may show minor cosmetic wear.)

Technical specifications

Spec	Value	Source
Power output (8 Ω)	100 W × 2	AudioControl Pro
Power output (4 Ω)	200 W × 2	AudioControl Pro
Bridged mono	400 W × 1 @ 8 Ω	AudioControl Pro
DAC	Wolfson 24‑bit / 192 kHz	AudioControl Pro
Inputs	TOSLINK, Coax S/PDIF, RCA, 3.5 mm, speaker‑level	AudioControl Pro
Outputs	5‑way binding posts, mono‑summed sub out, 12 V trigger	AudioControl Pro
Frequency response	20 Hz – 20 kHz (±0.5 dB)	AudioControl Pro
THD+N	0.09 %	AudioControl Pro
S/N ratio	> 95 dB	AudioControl Pro
Dimensions	8.5 ″ W × 5.4 ″ D × 2.9 ″ H	AudioControl Pro
Weight	2.7 kg (6 lb)	AudioControl Pro

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AudioControl Rialto 400 Compact 2.1‑Channel Amplifier & Hi‑Res DAC —White (Factory Refurbished)

AudioControl Rialto 400 Compact 2.1‑Channel Amplifier & Hi‑Res DAC —White (Factory Refurbished)