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  • Accepts three dual-channel slot-in wireless receivers for a total of six channels.
  • Compatible with existing slot-in and new SuperSlot wireless receivers.
  • Ability to set SuperSlot-compatible receiver frequency and power on/off from the 688.
  • Ability to monitor SuperSlot-compatible receiver battery, audio and RF levels from the 688.
  • Accepts analog or digital audio depending on wireless receiver.
  • Built-in antenna signal distribution
  • NP-1 battery slot for powering 688, receivers and external peripherals.
  • USB charging port.
  • Two 12V isolated outputs.
  • Two non-isolated direct battery outputs.
  • PowerSafe 10-second power reserve.
  • Easy to attach to the 688.

Powering and Wireless System for the 688 Mixer/Recorder

The SL-6 accessory combined with the 688 offers easy integration of multiple channels of wireless connectivity, mixing, recording and power management in a lightweight and easy-to-use package. The SL-6 simplifies interconnection between the 688 and multiple channels of wireless by accepting three dual-channel slot-in receivers, providing a total of six separate audio feeds. Easily attaching to the 688’s top panel, the SL-6 offers all powering and audio interconnection for standard slot-in receivers and additional control and monitoring when used with SuperSlot-compatible receivers. The SL-6 also distributes RF from external antennas to the receivers, creating a more efficient, compact configuration.


The SL-6 unifies powering options for the 688, wireless receivers, and peripherals devices. The SL-6 operates from a standard NP-1 (Lithium Ion or NiMH) rechargeable battery or from an external 10 to 18-Volt source via a 4-pin Hirose connector. There are two 12-Volt isolated, and two non-isolated outputs, each capable of delivering up to 0.5-Amp for powering other peripheral equipment. These power outputs are normally on, but may be switched off via a power selection menu. A 5-Volt USB charging port with a 2-Amp capacity is also included, making it easy to keep a smartphone, tablet, or other USB-powered devices charged.


Regarded as the industry’s first non-proprietary, open wireless control and interfacing standard, SuperSlot, developed by Sound Devices, is the result of its collaboration with a number of leading wireless manufacturers including Lectrosonics, Wisycom, Sennheiser, and Audio Ltd. The standard allows for all powering and audio interconnection, plus control and monitoring between SuperSlot-compatible mixers and receivers. When used with SuperSlot-compatible receivers, the SL-6 enables RF spectrum scanning and frequency assignment directly from the 688’s LCD.

SL-6 Compatible Wireless Receivers


Manufacturer Model Unislot Compatible
(Audio and Powering)
SuperSlot Compatible
(Control, Monitoring & RF Scan from 688 LCD)
Audio Ltd En2 CX2-P
Audio Ltd A10-RX
Lectrosonics SRa
Lectrosonics SRb ✓ with audio board update from Lectrosonics
Lectrosonics SRc
Lectrosonics SRc-941
Sennheiser EK-6042
Sennheiser EK 3241 ✓ (see note)
Wisycom MCR42 ✓ with SLK42-IKSS rear panel adapter

Note: While the EK3241model is Unislot compatible for audio and powering, it is not compatible with the antenna distribution of the SL-6.

What’s in the Box:

  • SL-6 powering and wireless system
  • 3 Wireless receiver mounting gaskets
  • 2 BNC to SMA connection adapters
  • Promo stickers
  • Product registration card

Additional information




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