A27M - Camera tripod SHURE - Free user manual and instructions

Product Type	Stereo Microphone Adapter
Brand	Shure
Model	A27M
Mounting Thread	5/8";-27 threaded studs (top and bottom)
Vertical Separation Options	1 1/4 in (31.8 mm), 2 5/8 in (66.7 mm), or 4 in (102 mm)
Rotation	Two vertically stacked sections rotate independently, with reference marks every 45°
Microphone Compatibility	Accepts microphones with 5/8";-27 thread or via swivel adapters (e.g., Shure A57D/A57E)
Stand Compatibility	Standard microphone stands with 5/8";-27 thread
Included Accessories	Cable clamp for microphone cables
Construction	Two black plastic sections on a vertical rod with knurled knob
Weight	Approximately 0.5 lb (0.23 kg)
Power Requirements	None (passive device)
Intended Use	Stereo broadcasting, recording, or sound reinforcement
Stereo Techniques Supported	X-Y, ORTF, NOS, Blumlein, MS (mid-side)
Maximum Microphone Spacing	4 in (102 mm) vertical separation
Minimum Microphone Spacing	Coincident (0 in) when sections aligned
Cleaning Instructions	Wipe with a dry, lint-free cloth
Warranty	2 years from date of purchase
Country of Origin	United States
Certifications	Not specified

Frequently Asked Questions - A27M SHURE

How do I adjust the vertical spacing between microphones on the A27M?

Loosen the knurled knob at the top, slide the two sections off the rod, reposition them with the studs at the desired spacing (1 1/4 in, 2 5/8 in, or 4 in), and retighten the knob.

What microphones are compatible with the A27M?

Any microphone with a 5/8";-27 threaded mount, or use a swivel adapter like the Shure A57D or A57E for microphones with a different thread.

Can I use the A27M with a camera tripod?

The A27M is designed for microphone stands with a 5/8";-27 thread. If your tripod has that thread, it may work, but the A27M is not a camera tripod itself.

What is the maximum and minimum vertical separation between microphones?

Maximum is 4 in (102 mm), minimum is coincident (0 in) when the sections are aligned. Preset positions are 1 1/4 in, 2 5/8 in, and 4 in.

How do I set the angle between microphones?

Loosen the top knob, rotate the sections to the desired angle using the 45° reference marks, then tighten the knob.

What stereo microphone techniques does the A27M support?

It supports X-Y, ORTF, NOS, Blumlein, and MS (mid-side) techniques by adjusting spacing and angles.

Is the A27M powered?

No, it is a passive mechanical adapter with no power requirements.

How do I clean the A27M?

Wipe it with a dry, lint-free cloth. Do not use liquids or abrasive cleaners.

What is the warranty on the A27M?

Shure provides a two-year warranty from the date of purchase covering defects in workmanship and materials. Contact Shure or your distributor for service.

Does the A27M come with a cable clamp?

Yes, a cable clamp is included to secure microphone cables to the adapter.

USER MANUAL A27M SHURE

A27M -- Stereo Microphone Adapter

General Description

The Shure model A27M is a stereo microphone adapter designed to hold two microphones in selectable positions for stereo broadcasting, recording or sound reinforcement. It allows two microphones to share one stand without losing independent positioning flexibility. The A27M permits coincident or closely spaced mounting with a wide range of directional angles, and vertical microphone separations of 1 1/4 inches (31.8 mm), 2 5/8 inches (66.7 mm) or 4 inches (102 mm).

The A27M consists of two vertically stacked sections that rotate on their centers. Each contains a 5/8"-27 threaded stud and locking ring to accept a variety of microphones. The bottom section contains a 5/8"-27 adapter for mounting on a microphone stand. A cable clamp for holding microphone cables is included.

Installation

To install the A27M, follow these steps:

1. Determine the vertical separation between microphones you desire. Minimum separation (coincident spacing) is generally desirable, but it may be necessary to provide greater spacing to accommodate the size or style of the microphones. By repositioning the sections of the A27M, the threaded studs may be 1 1/4 inches (31.8 mm), 2 5/8 inches (66.7 mm) or 4 inches (102 mm) apart.
2. To reposition the sections, unscrew the knurled knob at the top of the A27M and slide the two black sections off the vertical rod. Reposition the sections with the studs positioned for the vertical spacing desired. Replace the knurled knob.
3. Attach the microphones or swivel adapters (such as the Shure A57D or A57E) to the 5/8"-27 studs.
4. Attach the A27M to a microphone stand with a 5/8"-27 mounting thread.
5. Insert the microphones in the swivel adapters, loosen the knurled knob on the top of the A27M, and position the microphones for the desired response angles. The top of the knurled knob contains reference marks every 450; these may be used to position the microphones at the desired angle (see Figure 1).
6. Tighten the knurled knob, attach the microphone cables, and use the supplied cable clamp to fasten the microphone cables to the A27M.
7. Raise the microphone stand to the desired height. Fig-ure 2 shows a pair of Shure SM81 microphones mounted in an "ORTF" configuration on the A27M.

Stereo Recording Options

The A27M supports various popular pickup systems. Those described below result in (1) improved imaging over widely spaced microphones, and (2) superior depth reproduction over individually miked instruments. The spaced microphone technique creates a stereo effect mainly because of differences in the arrival time of the sound at each microphone. Coincident systems produce minimal arrival time differences. The stereo effect they create is due to in-terchannel amplitude differences. Closely spaced or near-coincident placement lends both time and amplitude differences to the stereo effect.

The table below describes five popular stereo pickup sys-tems. It specifies microphone types, angles and spacing. Those with coincident spacing have their diaphragms vertically in line. Closely spaced microphones have their dia-phragms separated by the specified distance. These and other microphone systems are detailed in the book "Stereo Microphone Techniques" by Bruce Bartlett (1991, Focal Press. ISBN 0-240-80076-1) and in "Microphone Tech-niques for Music Studio Recording" (AL1265) available from Shure Incorporated.

Stereo Pickup Systems	Microphone Types Microphone Configurations
X-Y 2 Cardioid Axes of maximum re-	sponse at 135°; spacing: coincident
ORTF (French Broadcasting Corporation)	2 Cardioid Axes of maximum re-sponse at 110°; spacing: 17 cm. (7 in.)
NOS (Dutch Broadcasting Foundation)	2 Cardioid Axes of maximum re-sponse at 90°; spacing: 30 cm. (12 in.)
Blumlein Pair or stere-osonic	2 Bidirectional Axes of maximum re-sponse at 90°; spacing: coincident
MS (Mid-Side) 1 Cardioid	1 Bidirectional	Cardioid and bidirectional forward pointed; spacing: coincident

Full Two Year Warranty

Shure warrants this product to be free in normal use of any defects in workmanship and materials for two (2) years from the date of purchase. If your Shure product fails within this period, call 1-800-516-2525 in the United States for details on repair, replacement, or refund. In Europe, contact Shure Incorporated Europe GMBH at +49 (7262)

924911 4 or [phone] (service hotline) or contact your authorized Shure distributor. This warranty does not cover abuse or misuse of the product, use contrary to Shure's instruction, ordinary wear and tear, an act of God or unauthorized repair.