SCM810 Speech Gate for Mixing Console

SCM810 Speech Gate for Mixing Console

The SCM810 can be used in conjunction with large mixing consoles to pro- vide automatic mixing for talk shows, panel discussions, and news shows. Large consoles have channel insert jacks so that external signal process- ing devices can be patched into individual channel signal paths. With this modification the SCM810 can be placed into unbalanced insert jacks, and the SCM810 used as a high-quality, external, 8-channel speech gate. This arrangement allows the operator complete control of each channel via the console's input control strip, while the SCM810 keeps the number of open microphones to a minimum.

In this operational mode:

1.The Direct Out jack tip is the input from the mixing console, and the ring is the output to the mixing console.

2.The SCM810 channel inputs, faders and EQ do not function.

3.NOMA does not function, channel Off-Attenuation is infinite.

4.The front-panel channel overload indicators indicate gating and over- load for each input.

5.The “Local” operating mode provides a non-automatic audio signal at the output for use in external mixes.

6.If the insert point on the mixing console is pre-fader, the gain trims should be set such that all microphone levels are similar.

Procedure: Short jumpers X103, X107, X108 and X906 (in the Master sec- tion). Remove resistors R1011, R1019, and R1020.

MUTE IN Precedence to OVERRIDE IN Precedence

With this modification and when both MUTE IN and OVERRIDE IN logic are grounded for a channel, the Override mode will take precedence (as sup- plied, the MUTE IN takes precedence over OVERRIDE IN).

Procedure: Short jumper X114. Remove resistor R1046.

Dead Zone on MUTE IN Defeat

As supplied, MUTE IN is intended for use as a momentary cough button or	Procedure: Short jumper X115.
privacy function (mute when necessary). However, if the MUTE IN is in-
tended to be used so that the talker must unmute microphones to enable
speech pickup (unmute when needed), this modification is needed. This re-
moves the muted channel from the MaxBus which eliminates “dead zones.”
A dead zone is an area in which a microphone picks up a talker through a
muted microphone and other microphones do not activate for that talker.

Change MUTE IN to Inhibit

As supplied, a channel will mute when its MUTE IN terminal is grounded.	Procedure: Short jumper X111.
The mute function can be changed to “Inhibit” by an internal modification
for each channel. After the modification, a logic “Low” at the MUTE IN ter-
minal prevents that channel from gating on if it is off, but allows it to remain
on if it is already on.
IMPORTANT: To prevent high-frequency oscillation, never connect a
channel's GATE OUT to its own MUTE IN unless the “Inhibit” modification
has been made.

Change OVERRIDE IN to MUTE IN for Use with Filibuster Mode

This modification should only be performed with the Change MUTE IN to Inhibit modification described above.

Procedure: Short jumper X113. Remove resistors R1046 and R1058.

Change Off-Attenuation Level

This modification changes the off-attenuation level from -15 dB to a select- ed value. Select from the following resistor values.

Off-Attenuation Level	Resistor Value

10 dB	18 kΩ

20 dB	50 kΩ

30 dB	150 kΩ

Procedure: Remove resistors R9088 and R9145. Install new resistor at jumper points X904 and X908.

SCM810AZ specifications

The Shure SCM810AZ is a highly regarded automatic mixer designed specifically for professional audio applications. It is an essential tool for sound reinforcement in situations where multiple audio sources need to be managed efficiently, such as in conference rooms, broadcast environments, and live events.

One of the standout features of the SCM810AZ is its advanced Automatic Mixing technology. This allows the unit to intelligently mix multiple microphones by reducing comb filtering and minimizing background noise. It utilizes an algorithm that automatically detects the level of each input and gradually adjusts its gain to create a balanced output. This results in a cleaner and more intelligible audio feed, ideal for environments with dynamic speaker presence.

The SCM810AZ is equipped with eight input channels, each with individual gain adjustments and the capability to accommodate various types of microphones, from handheld to lavalier. Each channel is designed with a low-cut filter to eliminate unwanted low-frequency noise, improving overall clarity. Additionally, the mixer includes a mic preamp with high headroom, ensuring that even the loudest sources can be captured without distortion.

Another significant characteristic of the SCM810AZ is its intuitive control interface. The front panel features legible LED indicators that provide real-time feedback on levels and activity, allowing users to quickly identify which channels are active. The mixer also includes a comprehensive monitoring section, allowing operators to listen to both individual channels and the overall mix.

In terms of connectivity, the SCM810AZ provides multiple output formats, including balanced XLR and unbalanced 1/4" outputs. This versatility makes it compatible with a variety of audio equipment, ensuring seamless integration into existing setups.

Durability is key in professional audio; thus, the SCM810AZ features a rugged design suitable for both permanent installations and portable use. Its compact form factor allows for easy rack mounting, saving valuable space in equipment setups.

In summary, the Shure SCM810AZ stands out as a professional-grade automatic mixer. With its intelligent automatic mixing technology, robust input options, intuitive interface, and versatile connectivity, the SCM810AZ is an indispensable tool for achieving high-quality audio in any multi-mic environment. Whether used for conferences, broadcasts, or live performances, it delivers consistent and reliable audio performance, meeting the demands of professional sound applications.