KEF LSX II

Drive units (per speaker)
Uni-Q driver array:
HF: 19mm (0.75in.) aluminum dome
LF/MF: 115mm (4.5in.) magnesium/aluminum alloy cone
Frequency range (-6dB) measured at 85dB/1m
49Hz – 47kHz
*Depends on EQ settings
Frequency response (±3dB) measured at 85dB/1m
54Hz – 28kHz  
*Depends on EQ settings
Amplifier output power (per speaker)
LF: 70W  
HF: 30W 
Amplifier class (per speaker)
LF: Class D  
HF: Class D
Max SPL measured at 1m
102 dB 
Wireless streaming features
AirPlay2
Google Chromecast 
Roon Ready*
UPnP Compatible 
Bluetooth 4.2
Streaming services
Spotify via Spotify Connect 
Tidal via Tidal Connect 
Amazon Music 
Qobuz 
Deezer
QQ Music via QPlay 
Internet Radio
Podcast
*Depends on services availability in different countries
Source resolution
Network up to 384kHz/24bit 
Optical up to 96kHz/24bit 
USB Type C up to 192kHz/24bit
HDMI up to 1.411Mbps PCM
*Depends on source resolution
Interspeaker connection
Wireless:  all sources resampled to 48kHz/24bit PCM 
Wired:  all sources resampled to 96kHz/24bit PCM
Supported format (network)
MQA^, DSD, FLAC, WAV, AIFF, ALAC, AAC, WMA, MP3, M4A, LPCM and Ogg Vorbis
Dimensions (HWD per speaker)
240 × 155 × 180 mm (9.5 × 6.1 × 7.1 in.)
Weight (per set)
7.2kg (15.6lbs)
Power input
100 – 240VAC 50/60Hz
Power consumption
200W (operating power) 
<2.0W (standby power)
Inputs
Primary speaker
HDMI ARC
TOSLINK Optical
USB Type-C
Analog 3.5mm Auxiliary
RJ45 Ethernet (network)
RJ45 Ethernet (inter-speaker)

Secondary speaker
RJ45 Ethernet (inter-speaker)
Output
RCA Subwoofer output
Wi-Fi network standard
IEEE 802.11a/b/g/n/ac
IPv4, IPv6
Wi-Fi network frequency band
Dual band 2.4 GHz / 5 GHz