AKG C747 User Manual

C 747
Condenser Microphone
Description
The AKG Model C 747 gradient condenser microphone
uses a short section interference tube to enhance its
directional characteristics, making it an excellent choice for
unobtrusive speech applications when mounted on a podium
or lectern, or for teleconferencing activities. The microphone
is about the size of a ballpoint pen and the mini-gooseneck
extension facilitates adjustment and height. The finish is dark
gray matte. Frequency response extends from 30 Hz to 18
kHz, and polar response is very uniform. The microphone
can handle sound pressure levels of 133 dB with only 1%
THD and operates with phantom powering over the standard
ranges from 12 to 48 volts.
Features
• Slim profile for unobtrusive podium
mounting
• Extended low and high frequency
response
• Hypercardioid pattern for
excellent off-axis rejection
• High sensitivity (8.5 mV/Pa)
• High acoustic level capability
(133 dB-SPL for 1.0% THD)
Specifications
Transducer Principle: Pre-polarized condenser
Frequency Range: 30–18,000 Hz
Polar Pattern: Hypercardioid
Sensitivity at 1,000 Hz: 8.5 mV/ Pa =
^
-42 dBV
Equivalent Noise Level: 21 dB-A
Sound Pressure Level for 1% THD: 133 dB
S/N Ratio (A-weighted): 73 dB
Electr. Impedance: ≤ 400 ohms
Load Impedance: > 1,500 ohms
Power Requirement: 9-52 volts phantom powering
Connector: 3-pin XLR type
Cable Length: 10 ft. (3 m)
Finish: Dark gray matte
Size: Dia 0.35 in. (9 mm),
Length 5.4 in. (137 mm)
Net/Shipping Weight: .9 oz. (25 g)/26.5 oz. (750 g)
Included Accessories: H 47 Shock mount/adapter
W 70 Windscreen,
MSH 70 Short gooseneck,
SA 47 Swivel stand adapter,
SA 80 Clamp, SHZ 80 screw link
Optional Accessories: ST 45, ST 46 Table stands
MSH 80 Long gooseneck;
B 18 E Battery supply
MF-DA Mounting flange

AKG C747 Specifications

General

Type	Condenser
Polar Pattern	Hypercardioid
Sensitivity	8 mV/Pa (-42 dBV)
Impedance	200 ohms
Connector	XLR
Recommended Load Impedance	>= 1000 ohms
Supply Voltage	9 to 52 V phantom power
Power Source	Phantom Power
Equivalent Noise Level	21 dB-A
S/N Ratio	73 dB

Summary

Product Description

Key Specifications

Transducer Principle

Pre-polarized condenser microphone.

Frequency Range

Frequency response from 30 Hz to 18,000 Hz.

Polar Pattern

Hypercardioid pattern for excellent off-axis rejection.

Sensitivity

Sensitivity of 8.5 mV/Pa at 1,000 Hz.

Equivalent Noise Level

Self A-weighted noise level of 21 dB-A.

Sound Pressure Level

Handles 133 dB SPL with 1% THD.

S/N Ratio

A-weighted signal-to-noise ratio of 73 dB.

Electrical Impedance

Electrical impedance is less than 400 ohms.

Power Requirement

Operates on phantom powering from 9 to 52 volts.

Connector

3-pin XLR type connector.

Included Accessories

Comes with shock mount, windscreen, and gooseneck.

Optional Accessories

Options include table stands and battery supply.

Product Features

Architects and Engineers Specifications

Graphical Data

On-axis Frequency Response

Chart showing frequency response from 20 Hz to 20 kHz.

Polar Response

Diagrams illustrating polar patterns at different frequencies.

Limited Warranty Information