XR™684/684+ Powered Sound Reinforcement Mixing Console
General Description:
Congratulations on your purchase of the XR™684/684+ powered mixer. Within one compact unit, we
have packed feature after feature, each displaying the latest technology available. Both the XR 684
and the XR 684+ are covered in this guide. The two units share the same preamp functions. They
are different only in the power amp as noted below. Throughout this manual, the term “XR 684” will
refer to both units unless otherwise noted. Here are several features found on your XR 684:
• 8 low-noise, low-Z mic preamps
• 4 true high-Z 1/4" mic inputs
• 3-band equalization (Channels 1—8)
• Monitor send (each channel)
• EFX send (Channels 1—8)
• -25 dB pad (Channels 1—6)
• Low-cut filter (Channels 1—6)
• Stereo line inputs (Channels 7—9)
• 16-bit, DSP-based stereo reverb/effects with two parameter controls
• Two 9-band graphic EQs with FLS®Feedback Locating System®
• 48 V phantom power
• Stereo/Main-Monitor mode switch
• 2x200 W @ 4 ohms internal power amplifier (XR 684 only)
• 420 W @ 8 ohms in bridge mode (XR 684 only)
• 2x400 W @ 4 ohms internal power amplifier (XR 684+ only)
• DDT™speaker protection
The standard channels (1—4) feature discrete low noise mic preamps with globally switched
phantom power, true high-impedance 1/4" mic inputs, low-cut filters, and three-band EQs. Two
additional channels (5—6) offer balanced XLR mic inputs and 1/4" line level inputs. Finally, there are
three stereo channels (7—9) for tape, CD, or synth inputs.
The master section features a unique graphic equalizer/power amp mode switch. Without patching,
the XR 684 can be used as a full stereo mixer amplifier (default). In the Main/Monitor mode, one
graphic and amplifier can be used for monitor and the other graphic and amplifier for the main L and
R (mono) signal.
Also included in the master section are 16 stereo digital effects from the award winning Deltafex™
digital signal processor. By including separate Time/Size and Color/Tone controls, the user can
create many effect settings from the 16 we provided. All channels, except Channel 9, have a
dedicated digital effects send routed directly to the DSP effects processor.
To take advantage of the XR 684’s powerful features, please read this owner’s manual carefully
and keep it as a reference. This manual includes several sections detailing individual areas of mixer
operation, including: control functions, set-up, and applications in sound reinforcement.
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