Sennheiser SL DW Boundary Set

SL DW Boundary Set is a ready-to-use wireless system for conference and meeting rooms, combining the SL Boundary 114-S DW boundary microphone with the SL Rack Receiver DW. It offers a versatile setup for clear speech, flexible placement and a tidy workspace without cables.

The boundary microphone is engineered specifically for speech applications: its cardioid pattern ensures focused voice pickup, while the boundary-layer design reduces sound reflections from the table surface. As a result, speech sounds natural, intelligible and consistent even in acoustically challenging rooms.

The microphone operates for up to 13 hours on the BA 40 battery and supports two charging methods – via USB or wirelessly using the CHG 2W induction charger. Clear LED indicators show battery status and activity.

The set includes the SL Rack Receiver DW – a professional receiver module with reliable RF transmission, automatic frequency management, AES 256 encryption and advanced audio processing features. It supports speech presets, a low-cut filter and a 7-band EQ, along with full remote control via Sennheiser Control Cockpit.

SL DW Boundary Set is an ideal solution for meeting rooms, conference environments, online collaboration, educational spaces and corporate installations where high-quality audio and flexible microphone placement are essential.

Key features:

• Full conference set: boundary microphone + receiver
• Boundary-layer design for natural and focused speech
• Cardioid pickup pattern
• Up to 13 hours of battery operation
• Charging via USB or CHG 2W induction station
• AES 256 encrypted transmission
• Automatic frequency management
• 7-band EQ, low-cut and speech profiles
• Full remote control through Sennheiser Control Cockpit
• Discrete design and compact form factor

Set components

• SL Boundary 114-S DW (wireless boundary microphone)
• BA 40 accupack
• SL Rack Receiver DW (incl. power supply)
• GA 4 rackmount kit
• USB cable, Quick Guide, Safety Guide

System (wireless link)

• AF frequency response: 20 Hz – 20 kHz
• Dynamic range: > 120 dB(A)
• THD (1 kHz): typ. 0.1%
• Audio sampling: 24-bit / 48 kHz
• Signal-to-noise ratio: > 90 dB(A)
• Encryption: AES 256
• Modulation: GFSK with back channel
• Transmission method: TDMA, space diversity
• Latency: 19 ms
• Max relative humidity: 95%
• Temperature range: operation -10 °C to 55 °C; storage -20 °C to 70 °C

RF frequency ranges

• EU: 1880–1900 MHz
• USA: 1920–1930 MHz
• Brazil: 1910–1920 MHz
• Taiwan: 1880–1895 MHz
• Japan: 1893–1906 MHz

SL Rack Receiver DW

• RF sensitivity: < -90 dBm
• RF back-channel output power: adaptive, up to 250 mW (country-specific)
• Audio outputs
• Balanced XLR: max. +18 dBu
• Unbalanced RCA: max. +6 dBu
• Audio processing
• Low cut: -3 dB at 120 Hz
• Equalizer: 7-band graphic EQ with sound presets
• Sound profiles: female voice, male voice, media
• User interface: OLED display, jog dial; pairing/escape/power buttons
• Networking: RJ-45, Media Control Protocol, TCP/IP IPv4 (DHCP/manual) and IPv6
• Connections
• AF outputs: XLR / 2× RCA
• Antenna: 2× reverse SMA
• Power: 12 V DC
• Current consumption: 350 mA
• Weight: approx. 828 g

Power supply units (receiver)

• NT 12-4C / NT 2-3
• Input: 100–240 V AC, 50/60 Hz
• Input current: max. 120 mA
• Output: 12 V
• Standby power: ≤ 0.3 W
• Energy efficiency level: V (NT 12-4C), IV (NT 2-3)
• Operating temperature: -10 °C to 55 °C
• Storage temperature: -20 °C to 70 °C
• Max relative humidity: 95%
• Weight: approx. 100 g (NT 12-4C), approx. 105 g (NT 2-3)

Accupack

• BA 40
• Capacity: 2200 mAh
• Output voltage: 3.6 V

SL Boundary 114-S DW

• AF frequency response: 40 Hz – 20 kHz
• Pickup pattern: cardioid
• Dynamic range: < 100 dB(A)
• Sensitivity: 10 mV/Pa
• Battery: BA 40 accupack (Li-Ion 3.6 V)
• Operating time: typ. 13 h
• Charging: inductive wireless charging or via USB
• Max relative humidity: 95%
• Temperature range: operation 10 °C to 45 °C; storage -20 °C to 70 °C
• Dimensions: 114 × 85.3 × 30.8 mm (4.49 × 3.36 × 1.21 in)
• Weight: approx. 208 g (without accupack)

Product variants (frequency / region / PSU)

• DW-3-EU (506614): 1880–1900 MHz, EU PSU, Europe/India/Indonesia/Malaysia
• DW-3-UK (506617): 1880–1900 MHz, UK PSU, UK/Hong Kong/Singapore
• DW-3-AU (506620): 1880–1900 MHz, AU PSU, Australia
• DW-4-EU (506633): 1920–1930 MHz, EU PSU, Latin America
• DW-4-US (506630): 1920–1930 MHz, US PSU, USA/Canada
• DW-5-US (506653): 1893–1906 MHz, US PSU, Japan
• DW-6-US (506643): 1880–1895 MHz, US PSU, Taiwan
• DW-7-BR (506968): 1910–1920 MHz, BR PSU, Brazil