AKG CGN 99 C Condenser Gooseneck Microphone Instruction Manual

: June 13, 2024
: AKG

Table of Contents

Safety and Environment
Description
Microphone Applications
Installation and Connection
Introduction
Specifications
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

**AKG CGN 99 C Condenser Gooseneck Microphone Instruction Manual

**

Safety and Environment

Do not spill any liquids on the equipment and do not drop any objects through the ventilation slots in the equipment.
Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. and do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock.
The packaging of the equipment is recyclabe. To dispose of the packaging, make sure to use a collection/recycling system provided for that purpose and observe local legislation relating to waste disposal and recycling.

Description

Introduction

Thank you for purchasing a Discreet Acoustics module. The Discreet Acoustics Compact Series comprises four gooseneck microphones, one flown microphone, and dedicated accessories for every application and every type of venue.

Microphones

Refer to figs. 9 to 14

CGN 99 C/S (order no. 2965H00110): 380-mm (15-in.) cardioid gooseneck microphone with integrated DPA XLR phantom power adapter and external foam windscreen.

CGN 99 H/S (order no. 2965H00120): 380-mm (15-in.) hype cardioid gooseneck microphone with integrated DPA XLR phantom power adapter and external foam windscreen.

CGN 99 C/L (order no. 2965H00130): 576-mm (23-in.) cardioid gooseneck microphone with integrated DPA XLR phantom power adapter and external foam windscreen. CGN 99 H/L (order no. 2965H00140): 576-mm (23-in.) hype cardioid gooseneck microphone with integrated DPA XLR phantom power adapter and external foam windscreen.

CHM 99 (order no. 2965H00150): cardioid flown microphone with spring clamp and 10-m (33-ft.) special cable with DPA XLR phantom power adapter

Always use the supplied windscreen (unless it would be too visually obtrusive). It protects the microphone from dust and moisture, and reduces pop and wind noise to a minimum.

B 18 battery power supply for all Discreet Acoustics Compact microphones.

PS3 F-Lock panel mount socket for all Discreet
Acoustics Compact gooseneck microphones (not for CHM 99).

H 500 shock mount for all Discreet Acoustics Compact gooseneck microphones (not for CHM 99).

H 600 shock mount for all Discreet Acoustics Compact gooseneck microphones (not for CHM 99).

SA 60 stand adapter for all Discreet Acoustics Compact gooseneck microphones (not for CHM 99).

ST 1, ST 45 table stands for all Discreet Acoustics Compact gooseneck microphones (not for CHM 99).

Optional Accessories

Refer to fig. 9.
Refer to fig.10.
Refer to fig.11.
Refer to fig.12.
Refer to fig.13.

Microphone Applications

Note that both the maximum working distance and the area covered by the microphone depend on the pickup angle. The smaller the pickup angle (hype cardioid), the longer the maximum distance between the talker and the microphone and the smaller the area covered by the microphone.

Whether a cardioid or hype cardioid capsule will give the best results therefore depends on the specific application situation).

Microphone| Polar Pattern| Speaker position| Working distance| Application
---|---|---|---|---
CGN 99 C/S| Cardioid| Beaned the micro- phone only| 30 to 60 cm(1 to 2 feet)| Sound system
CGN 99 H/S| Hypercardioid| 90° to 135° offmicrophone axis| 30 to 90 cm(1 to 3 feet)| Sound system
CGN 99 C/L| Cardioid| Behind the micro- phone only| 30 to 60 cm(1 to 2 feet)| Sound system
CGN 99 H/L| Hypercardioid| 90° to 135° off microphoneaxis| 30 to 90 cm(1 to 3 feet)| Sound system
CHM 99| Cardioid| Behind the micro- phone only| 1 to 3 m*(3.5 to 10 feet)| Sound system

Table 1: Microphone applications.

Depending upon Acoustic environment

Installation and Connection

Introduction

All Discreet Acoustics Compact microphones are condenser microphones and therefore require a power supply (phantom power). The microphones have been designed for connection to microphone inputs with 9 to 52 V phantom power. To connect Discreet Acoustics Compact microphones to inputs without phantom power, refer to Section 4.4.

CGN 99 … Gooseneck Microphones

Refer to figs. 9 and 12.

Use the optional PS 3 F-Lock panel mount socket to install the microphone in a tabletop or an optional SA 60 stand adapter to mount the microphone on a floor or table stand.
Note: For even better vibrational noise rejection, you can fix the microphone to the tabletop with an optional H 500 or H 600 shock mount.
Refer to figs. 10 and 11.
Use a shielded cable to connect the microphone to a microphone input with phantom power.
If the phantom power on your mixing console is switchable, switch the phantom power on. (Refer to the instruction manual for your mixing console.) The microphone is powered directly from the phantom power source on the console.

CHM 99 Flown Microphone

Prior to installing the microphone , straighten the cable by carefully pulling it through your fingers. Make sure not to buckle or twist the cable. Let hang for 1 day to untwist.
Fasten a hook to the ceiling, use an existing hook, or stretch a fishing line across the hall.
Pass the cable through the hook or over the line so that it will hang at the desired height.

Important!

Do not tie a knot into the cable to hang it on the hook. This may cause the cable to twist and misalign the microphone after a while.

Fig. 1: Aligning the microphone.

Note :

The cable on the CHM 99 will twist as the ambient temperature changes, e.g., in the heat generated by spotlights.
The angle of twist depends both on the ambient temperature and the cable length. The shorter the cable, the smaller the amount of twist.
If you use spotlights, be sure to turn them on before aligning the microphone.
When you turn the spotlights off, the microphone will rotate out of alignment. Upon turning the spotlights back on, the microphone should rotate back into its original position.

Stabilizing the Microphone

To stabilize the microphone,

Leave an appropriate length of fishing line through the eyelet on the spring clamp of the CHM 99.
Fix the fishing line to two opposite walls so as to create just enough downward pull to steady the microphone laterally.

Applications

Fig. 2: Theater stage **making

**

**Fig. 3: Making up a choir

**

Audio Connection

Use a shielded balanced cable to connect the microphone to a microphone input with phantom power.
If the phantom power on your mixing console is switchable, switch the phantom power on. (Refer to the instruction manual for your mixing console.) The microphone is powered directly from the phantom power source

Connecting to Inputs without Phantom Power

If your mixer has no phantom power, insert an external phantom power supply between the DPA phantom power adapter and mixer input. We recommend the optional B 18 power supplies from AKG. Using any power supplies not recommended by AKG may damage your microphone and voids the warranty. You may also consider having a qualified technician retrofit a phantom power supply as per IEC 61938 to balanced or unbalanced mixer inputs. The IEC 61938 standard specifies a positive voltage of 12, 24, or 48 V on the audio lines versus the cable shield.

Balanced Inputs

Input transformer with center tap (ungrounded)

Input transformer with no center tap (ungrounded)

If your equipment inputs are grounded or transformer less, wire either capacitors or extra transformers into the audio lines as shown in fig. 9 above in order to prevent any current leakage into the input stage.

Unbalanced Inputs

Unbalanced input stage

Table 2: Standard values for Rv and 2 x Rv

VDC	Rv	2 x Rv*
12 V ±2 V	330 Ω	680 Ω
24 V ±4 V	680 Ω	1,200 Ω
48 V ±4 V	3,300 Ω	6,800 Ω

In order to satisfy the IEC 61938 symmetry requirement, make sure the actual values of the two resistors 2 x Rv do not differ by more than 0.5%!

Bass Cut

The DPA phantom power adapter is equipped with a bass cut filter to minimize low-frequency noise.

Fig. 7: Fixing screw.

Refer to fig. 7.

Unscrew the fixing screw on the microphone or DPA phantom power adapter.
Pull the circuit board out of the case WITH CAUTION so as not to break the internal leads.
Fig. 8: DPA circuit board.
Refer to fig. 8
To acitvate the bass cut filter, plug the jumper J1 into the central contact pair on the circuit board.

Specifications

Microphone| CGN 99 C/S CGN 99 C/L| CGN 99 H/S CGN 99 H/L| CHM 99
---|---|---|---
Type| Pre-polarized condenser microphone
Polar pattern| Cardioid| Hype cardioid| Cardioid
Frequency range| 70 to 18,000 Hz| 50 to 19,000 Hz| 70 to 18,000 Hz
Sensitivity| 18 mV/Pa -35 dBV| 12 mV/Pa -38 dBV| 18 mV/Pa -35 dBV*
Max. SPL for 1% THD| 125 dB| 125 dB| 125 dB
Equivalent noise level| <21 dB-A| <21 dB-A| <21 dB-A
Signal/noise ratio(A-weighted.)| >73 dB| >73 dB| >73 dB
Electrical impedance| <600 L| <600 L| <600 L
Receommendedload impedance| >2000 L| >2000 L| >2000 L
Power requirement| 9 to 52 V phantom power to IEC 61938(DPA adapter integrated)
Current consumption| <3 mA| <3 mA| <3 mA
Connector| XLR-3| XLR-3| XLR-3
Finish| matte black| matte black| matte black
Size(capsule dia. x length)| 13.5 x 380 mm (0.5 x 15 in.)13.5 x 580 mm(0.5 x 23 in.)| 13.5 x 380 mm (0.5 x 15 in.)13.5 x 580 mm(0.5 x 23 in.)| 13.5 x 55 mm (0.5 x 2.1 in.)
Net/shipping weight| 160/480 g (5.7/17 oz.) 170/500 g(6/17.7 oz.)| 160/480 g (5.7/17 oz.) 170/500 g(6/17.7 oz.)| 20/480 g (0.7 x 17 oz.)
Order no.| 2965H001102965H00130| 2965H001202965H00140| 2965H00150

re 1 V/Pa
This product conforms to the standards listed in the Declaration of Conformity. To
order a free copy of the Declaration of Conformity, visit http://www.akg.com or contact sales@akg.com.
- CGN 99 C/S Frequency Response & Polar Diagram
- CGN 99 C/S Frequency Response & Polar Diagram
- CGN 99 C/L Frequency Response & Polar Diagram
- CGN 99 C/L Frequency Response & Polar Diagram
- CHM 99 Frequency Response & Polar Diagram