Superlux CMH8CH User Manual

Spe cific ations

J U S T P L A Y I T

CMH8CH 8BH 8AH

Large-diaphragm

Condenser Microphone

User Guide

G O A N G - F A N N C O . , L T D .

2007, S UPERLUX I
LB100H8 AH01EN ( Rev. 1)

Type

Condenser Microphone

Element

Pressure gradient,
FET preamplifier

Polar pattern

Max. SPL (1 kΩ l oad)

CMH8AH: 132dB SPL
CMH8BH: 142dB SPL
CMH8CH:
Cardioid: 138dB SPL
Figure 8: 142dB SPL
Omni.: 142dB SPL

(THD≦0.5% 1kHz)

250 Hz

500 Hz

1000 H z

CMH 8AH/H 8BH

TYP ICAL PO LAR PAT TERN igu re 1 (F )

2000 H z

4000 H z

8000 H z

Ext ernal s witch

onl y for CMH 8CH

Blu e LED lig ht

CMH8AH/CMH8BH:
Cardioid (Figure 1)
CMH8CH: Cardioid / Figu re 8 /
Omnidirectional (Figure 2)

Frequency response

30 to 20,000 Hz (Fig ure 3)

Sensitivity

(at 1,000 Hz Open Circu it Voltage)

CMH8AH/CMH8BH:

-34dBV/Pa (20mV/Pa)
CMH8CH:
Cardioid: -31dBV/Pa (28mV/Pa)
Figure 8: -35dBV/Pa ( 17m V/Pa)
Omni.: -35dBV/Pa (17 mV/ Pa)
1Pa=94dB SPL

Rated impedance

200Ω

Minimum load impedance

1000Ω

Equivalent noise level

(A-weighted)

CMH8AH/CMH8BH: 18dB
CMH8CH:
Cardioid: 14dB
Figure 8: 18dB
Omni.: 18dB

nc.

Dynamic range at 1 kΩ Lo ad

CMH8AH: 114dB
CMH8BH/CMH8CH: 124dB

Power supply

48 Vdc phantom power

Current consumption

CMH8AH/CMH8BH: 2.7mA
CMH8CH: 4mA

Polarity

Pin 2 outpu t positive vo lta ge
(related to pin 3) when dia phr agm
receives positive pressure.
(Diaphragm moving inwa rd)

Connector

3 pin male XLR type

Finish

Black leather finish

Dimensions

Φ54.0mm(2.13in.) X 2 09. 0mm

(8.23in.) (Figure 4)

Net weight

CMH8AH/CMH8BH: 550g(19.40oz.)
CMH8CH: 570g(20.11oz.)

－1－

250 Hz

500 Hz

1000 H z

CMH 8CH

2000 H z

4000 H z

8000 H z

CAR DIOID T YPICA L POLAR P ATTER N

200 Hz

1000 H z

1000 0 Hz

CMH 8CH FIG URE 8

TYP ICAL PO LAR PAT TERN

1000 H z 8000 H z

2000 H z

4000 H z

CMH 8CH OMN I.

TYP ICAL PO LAR PAT TERN

(Fi gure 2)

dB

10

0

-10

-20

RELATIVE RESPONSE IN dB

20 50 10 0 200 500 1000 2000 5000 10000 20000 Hz

dB

Cardio id

10

Roll-o ff

-10dB

0

-10

-20

RELATIVE RESPONSE IN dB

20 50 10 0 200 500 1000 2000 5000 10000 20000 Hz

dB

Cardio id
Fig.8
Omni.

10

Roll-o ff

-10dB

0

-10

-20

RELATIVE RESPONSE IN dB

20 50 10 0 200 500 1000 2000 5000 10000 20000 Hz

FREQUENCY IN Hz

FREQUENCY IN Hz

FREQUENCY IN Hz

TYP ICAL FR EQUEN CY RESP ONSE (F igure 3)

－2－

1600 0 Hz

CM- H8AH

CM- H8BH

CM- H8CH

Ext ernal s witch f or

CMH 8BH/8 CH

(Figu re 4)

Des cript ion

CMH8AH/CMH8BH are condenser c ardioid microphones with la rge

diaphragm of 1" in diameter; while C MH8 CH features conver tible polar

patterns o f cardioid, figure-of-8 and omni. Th eir tailored frequency

response make them ideal candidate for the recordin g of m usi c program.

They are also suitable for general recording, broadcasting, stage

reinforcement, etc.

Fe atures

! Larg e-dia phrag m capsule o f g old-evaporat ed memb rane 1" in

diameter and 3μm in thickness.

! Low-noise transformer circuit.

! Wide frequency res pon se.

! Blue LED light o n the f ront indicating the working condition of the

phantom power supply.

! CMH8AH has an internal low-cut filter switch.

! CMH8BH has an external switch for low-cut filter and -10dB ro ll-off.

! CMH8CH has a dual-membrane capsule with an exter nal s wit ch fo r

low-cut filter and -10dB ro ll- off. At the back of the body, there is a
switch for converting polar patterns among cardioid, figure-of-8 and
omni.

Converting

polar patterns

H8CH

Low Frequency

Rol l-o ff

H8BH H8CH

－3－

-10dB PAD

H8BH H8CH

Package

Large crash-proof carrying cas e ---------- -------- A5 carrying case---

Acc essories

Supplied accessories

Anti-shock bracket --- --- --- --- --- --- --- --- - - --- --- --- --- --- H M26 A
Standard rotatable conn ect or --------------------------------- HM8B
Black pop screen ------ --- --- --- --- --- --- --- --- --- ------------ S6 5
Metal screw adaptor --- --- --- --- --- --- --- --- --- --- ------------ YA1

--

Knowing your microphone

Superlux provides variety selection of microphones for professionals and amatures. To
know your microphone is the first step to successful result.

Type of transducer

Condenser

Extremely light weight diaphragm, very sensitive to sound. Ver y small versions
available for hiding applications. High performance condenser microphones are
regarded as standard equipment of recording studios for extreme detail capturing.
Operates with power, such as phantom or battery.

Cardioid

Picks up most signal on axis. Rejects side and picks up least to the back. Suitable for
live sound re-inforcement. Apparent proximity effect and most singer likes to take this
bass boost advantages which is not good for speech.

Figure 8, bi-directional

Equal s ensitive to both ends, and rejects the sides. Good to noisy environment to reject
distant noise and low frequency. Also a good choice for stereo recordings, such as
Blumlein. Typical pressure gradient characteristic.

A5

Car rying c ase

HM2 6A

Ant i-sho ck brac ket

HM8 B Rotat able

con necto r

Pop sc reen

S65

YA1 s crew

ada ptor

Optional accessories

Phantom power supply ------------------------------------- PS2A
Desktop holder ---------- --- --- --- --- --- --- --- --- --- -------- HM 48B
Desktop holder ---------- --- --- --- --- --- --- --- --- --- -------- HM 58B
Black foam windshield -------------------------------------- HM18AG

HM1 8AG

Foa m winds hield

PS2 A

Pha ntom

pow er supp ly

Powering microphone

Condenser microphones work with power. Professional standard is 48VDC phantom
power. Some microphones work with lower voltage as low as 1.5VDC, such as battery
power m odel. CMH8CH/BH/AH work with 48VDC phantom only. Please make sure your
sound system provide adaquate power to the microphone.

About Frequency Response

Flat

Suitable for working at controlled environment, or for acoustic measurements.
Although people persuit flatness, but for none-professionals, it is a challenge to makes
it works as expectation.

Popular cur ve response

Based on years of practical experience of pro users. There are curves to be build for
various applications, so that it is very simple to use the microphone for the purpose.
Limiting bandwidth, and emphasing are typical skill.

Variable response

Incorporating switchable filters to elliminates interference, such as sub-sonic filter to
cut air-conditioner and floor vibrations. And allows full flat when used in controlled
environment.

Directivity

Select or set the directivity of your microphone for stereo recording, for various music
instrument, vocal, speech, and environmental sound pick-up. Pair of spaced omni for
A/B stereo, pair of near coincident cardioid for ORTF, and pair of coincident XY for
Blumlein stereo.

CMH8CH polar variation

Double diaphragm structure with cardioid acoustic nature, CMH8CH can be set at
OMNI, Cardioid, and Figure-8 polar mode.

Distance to source

Close miking or distant miking sound very differently. Vocal recording or live
performance practice close miking mostly. Suitable proximity effect is one desired
target, and lower feedback problem is another factor for live sound application.

While distant miking is common practice for recording, especially stereo pair
recording with large group of performers, such as orchestra or choir.

Distant miking generally picks up less bass section with pressure gradient type of
microphone (cardioid, figure-8, shotgun...) due to acoustic nature and lack of
proximity effects.

Rich bass with distant miking can be recorded with pressure type of microphone
(Omni), which performs the same frequency response with close or distant pick-up.

Mounting the microphone

Pressure gradient microphone is very sensitive to vibration. Suitable shock mount for
high performance microphone is necessary for extreme low noise recording. Sturdy
stand can set the microphone excatly at the sweet spot and keep it there. Choose heavy
duty microphone stand for studio condenser microphone which weights much more
than handle microphone.

Superlux provides wide range of microphone stands for various demands. Big Foot
Willie is specially developed for large condenser microphones that able to support 2
large microphones with stereo bracket for single point stereo recording.

Extension foot on all the 'E' versions serve to mount heavy studio microphone in limit
space live sound applications.

HM4 8B

Des ktop ho lder

HM5 8B

Des ktop ho lder

Omni

Equal se nsi tiv ity t o all d irectio n, so t hat t he mi crophone
doesn t n eed t o pointi ng towar d the s oun d sou rce. Low
handli ng a nd w ind nois e. Welcome by ne ws g ath ering, and
music re cor din g applica tio ns.

－5－－4－ －6－

Maintainence

Condenser microphone shall be kept in low humidity environment for best sound
performance. S tore the condenser m icrophones in airconditioned room or dehumidifier
to keep away form moisture. Clean air is another important factor. Keep away from
smoking environment to avoid tar residuals.