telephone line. If a coupler is required, make certain the coupler selected and the wiring arrangement are in com- pliance with the telephone company regulations.

When direct connection to a telephone line is not pos- sible, acoustic coupling to a telephone handset may be used. A Shure Model 50AC Telephone Acoustic Coupler can be connected to the 600 ￿￿line or headphone output of the M267 and attached to most telephone handsets.

Telephone Line Surge Protection

When using the M267 connected directly to a telephone line subject to lightning-induced voltage surges, the fol- lowing commercially available part can be installed across the LINE OUT terminals to provide additional protection for output circuit components:

Metal Oxide Varistor, General Electric Co., Type No. V22ZA1

ACCESSORIES

A268R Rack Panel Kit. The Model A268R Rack Panel Kit includes a 19 in. x 3-1/2in. (483 mm x 89 mm) precut rack panel and necessary hardware for rack-mounting the M267 (with its cover in place and end caps removed) in a standard 19 in. (483 mm) rack panel.

RKC169 Rack Panel Bracket Kit. The Model RKC169 Rack Panel Bracket Kit enables owners of the Shure A68R Rack Panel Kit (originally designed for the M67 and M68 Mixers) to rack-mount the M267 with the A68R.

SERVICE

WARNING

Voltages in this equpment are harzardous! Refer servicing to qualified service personnel.

240 Vac Operation

To change the M267 operating voltage from 120 Vac to

240 Vac, follow these steps:

1.Disconnect the M267 from the ac line.

2.Remove the end caps and cover.

3.Locate the voltage selector switch (S201) at the right rear of the main printed circuit board (Figure 3). Move SD201 to the 240V position (toward the front panel).

BLK

 

WHT

 

 

120V

 

F202

T206

 

S201

 

T50/250V

 

 

 

F201

240V

 

 

240 V WIRING

FIGURE 3

4.Remove fuse F201 (0.1A, 250V, time lag) and replace it with the supplied fuse F202 (0.05A, 250V, time lag). Note that the F202 fuse holder is at right angles to the F201 fuse holder.

5.Replace the ac line cord (if necessary) with one de- signed for the 240 Vac source. If the M267 is to be used outside the U.S. and Canada, local regulations may require replacing the line cord with one having wire insulation colors as follows:

 

ªLiveº or

 

Earth or

 

ªHotº

Neutral

Ground

U.S., Canada

Black

White

Green

Europe

Brown

Blue

Green/

 

 

 

Yellow

6. Replace the cover and end caps, and mark the rear panel to reflect the new operating voltage.

5

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Shure M267 specifications Telephone Line Surge Protection, Service, Vac Operation, ªLiveº or Earth or ªHotº Neutral Ground
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M267 specifications

The Shure M267 is a versatile and robust audio mixer designed primarily for professional audio environments. Known for its high-quality sound and reliable performance, this mixer has been a staple in both live and studio applications. One of the standout features of the M267 is its four-channel configuration, which allows for multiple audio sources to be mixed simultaneously. This makes the mixer ideal for a variety of settings, including live events, broadcast, and recording sessions.

The M267 employs a range of advanced technologies to ensure optimal sound quality and user experience. One of the key technologies within the M267 is its low-noise preamps, which are designed to deliver clear and precise audio with minimal background noise. This is particularly important in professional environments where clarity is paramount. The mixer also includes a built-in limiter, which provides additional control over audio dynamics, preventing distortion during loud peaks and ensuring a clean signal.

The M267 features a simple and intuitive user interface that makes it easy for users of all skill levels to operate. Each channel is equipped with individual level controls, EQ settings, and PFL (Pre-Fader Listen) capabilities. With these controls, operators can tailor the audio signal to their specific requirements, whether they are balancing microphones, musical instruments, or playback devices.

Another significant characteristic of the M267 is its rugged construction. Designed to withstand the rigors of frequent transport and use in demanding environments, the mixer is built with high-quality components that ensure durability and longevity. Its compact size also makes it an excellent choice for mobile setups, allowing audio professionals to transport it easily from one location to another.

Furthermore, the Shure M267 incorporates flexibility in its connectivity options. It provides various input and output configurations, allowing seamless integration with other audio equipment. This versatility makes it a suitable choice for both permanent installations and portable setups.

In summary, the Shure M267 is a highly regarded mixer that combines professional-grade sound quality with practical features tailored for audio professionals. Its low-noise preamps, intuitive controls, rugged build, and flexible connectivity position it as an excellent choice for anyone seeking a dependable and effective audio mixing solution in both live and recorded scenarios. Whether in the studio or on stage, the M267 consistently delivers the performance that audio professionals demand.
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