Josephson C720 Manual Download Page 4

ringing.

  

Maintaining

 

acoustical

 

transparency

 

around

 

the

 

capsule

 

is

 

important

 

in

 

achieving

 

the

 

sonic

 

clarity

 

that

 

is

 

this

 

mic’s

 

signature.

  

 

The

 

output

 

cable

 

of

 

the

 

C720

 

terminates

 

in

 

a

 

7

pin

 

XLR

 

type

 

connector.

 

An

 

adapter

 

is

 

provided

 

to

 

bring

 

front

 

and

 

back

 

outputs

 

to

 

normal

 

3

pin

 

XLR

 

connectors.

 

Either

 

the

 

front

 

or

 

the

 

back

 

may

 

be

 

used

 

as

 

a

 

cardioid

 

microphone

 

 

just

 

plug

 

the

 

corresponding

 

connector

 

into

 

your

 

recording

 

chain.

 

 
 

Pattern

 

Control

 

 

 

The

 

user

 

may

 

accomplish

 

the

 

same

 

function

 

provided

 

by

 

a

 

traditional

 

pattern

 

control

 

switch

 

or

 

box,

 

by

 

connecting

 

the

 

front

 

and

 

back

 

signals

 

from

 

the

 

C720

 

to

 

two

 

inputs

 

on

 

a

 

mixer.

 

Use

 

just

 

the

 

front

 

signal

 

or

 

the

 

back

 

signal

 

for

 

a

 

front

‐ 

or

 

rear

facing

 

cardioid.

 

Mix

 

the

 

two

 

signals

 

in

 

phase

 

to

 

make

 

an

 

omni

 

pattern,

 

or

 

flip

 

the

 

phase

 

of

 

the

 

rear

facing

 

signal

 

and

 

mix,

 

to

 

make

 

a

 

figure

8

 

pattern.

 

Any

 

intermediate

 

pattern

 

can

 

be

 

made

 

by

 

mixing

 

the

 

two

 

signals

 

in

 

different

 

proportions.

 

Use

 

this

 

chart

 

as

 

a

 

starting

 

point

 

for

 

your

 

own

 

experiments.

 

 

Pattern

 

Rear

 

Phase

  

Front

 

Gain

 

Rear

 

Gain

   

 

Front

 

Cardioid

 

Normal

 

0

        

       

off

 

Rear

 

Cardioid

 

Normal

 

off

 

 

0

 

Subcardioid

 

Normal

 

2

 

15

 

Omni

 

Normal

 

3

 

3

 

Hypercardioid

 

Invert

 

2

 

15

 

Figure

8

 

Invert

 

3

 

3

 

 

Where

 

the

 

geometry

 

is

 

appropriate

 

(for

 

instance,

 

in

 

an

 

ambient

 

room

 

pickup)

 

the

 

C720

 

may

 

also

 

be

 

used

 

as

 

a

 

stereo

 

microphone,

 

with

 

its

 

two

 

closely

 

matched

 

cardioid

 

capsules

 

facing

 

left

 

and

 

right.

  

 
 

About

 

Directional

 

Patterns

 

 

Microphones

 

achieve

 

their

 

directional

 

response

 

by

 

subtracting

 

sound

 

that

 

comes

 

from

 

some

 

directions,

 

from

 

the

 

overall

 

sound.

 

This

 

doesn’t

 

let

 

us

 

focus

 

a

 

beam

 

of

 

pickup

 

sensitivity

 

in

 

one

 

direction,

 

but

 

it

 

does

 

allow

 

us

 

to

 

steer

 

a

 

“null”

 

in

 

one

 

direction,

 

and

 

the

 

response

 

to

 

sounds

 

arriving

 

from

 

the

 

area

 

of

 

the

 

null

 

may

 

be

 

 

Summary of Contents for C720

Page 1: ......

Page 2: ...JOSEPHSON ENGINEERING Inc 329A Ingalls Street Santa Cruz California 95060 Tel 831 420 0888 Fax 831 420 0890 email info josephson com http www josephson com 2008 Josephson Engineering Inc ...

Page 3: ...l foam basket Unlike traditional microphone housings made of perforated metal or screen with reflective metal support structures this highly open material protects the capsule mechanically provides electrical shielding and some pop and wind screening no supporting structure is necessary A fine acoustically transparent screen inside the basket helps protect the capsule from breath moisture when the...

Page 4: ...ern or flip the phase of the rear facing signal and mix to make a figure 8 pattern Any intermediate pattern can be made by mixing the two signals in different proportions Use this chart as a starting point for your own experiments Pattern Rear Phase Front Gain Rear Gain Front Cardioid Normal 0 off Rear Cardioid Normal off 0 Subcardioid Normal 2 15 Omni Normal 3 3 Hypercardioid Invert 2 15 Figure 8...

Page 5: ...alf of the C720 has this directional pattern one is facing forward and the other faces to the rear If you mix the front and rear signals equally the result is an omnidirectional pattern sounds are picked up evenly from all directions If you mix the front and rear signals in different ratios the result is an omnidirectional type pattern but not perfectly even Mixing the rear signal at 6 dB versus t...

Page 6: ... from cardioid through the figure 8 end of the spectrum will have one or more nulls somewhere in the pattern and the direction and width of this dead zone make a big difference in the overall sound As you change patterns listen to how the overall room sound changes If you re working close to the microphone you ll also notice that the bass boost caused by proximity effect becomes stronger as you ch...

Page 7: ...ear the effect of your adjustments on the overall pattern Adding a little bit of the rear facing cardioid say at 12 dB relative to the front will reduce the depth of the null in the back of the mic producing a sub or wide cardioid pattern less directional than the standard cardioid and with a greater level of room ambience Proximity effect is reduced too so if the performer is moving around too mu...

Page 8: ...tput transformer which uses amorphous metallic glass as the magnetic core material The result is a much higher overload point even when the mic is driving long cables It is the same audio circuit and transformer found in Josephson s acclaimed e22S microphone The internal power supply of the C720 uses a new electrostatic circuit that provides capsule polarization charge without the use of oscillato...

Page 9: ...The breakout cable diagram is shown here for reference The C720 will operate properly with either front or back sides of the microphone connected or both Full P48 phantom power is required ...

Page 10: ... volts 5 mA per output Internal impedance 100 ohms Rated impedance 200 ohms Minimum load impedance 1k ohms Free field and rated sensitivity 1 7 mV Pa Frequency Range 20 20 000 Hz Directional characteristics 2x cardioid Overload sound pressure 136 dB SPL at 1000 Hz Equivalent sound pressure due to inherent noise 15 dB SPL A weighted rms in accordance with IEC 60268 1 ...

Page 11: ...uirements of the European Union directives as follows Machinery 93 68 EEC Exempt passive sensor Low Voltage 93 68 EEC Exempt passive sensor EMC 93 68 EEC Exempt passive sensor RoHS 2002 95 EEC Compliant for Hg Cd Cr6 PBB PBDE and Pb David Josephson CEO Josephson Engineering Inc 329A Ingalls St Santa Cruz CA 95060 USA ...

Page 12: ...y Josephson Engineering will at its option repair or replace any microphone that fails providing that it is returned to the factory prepaid and has not been abused or altered There are no user serviceable parts inside Josephson Engineering microphones Disassembling a Josephson microphone will void its warranty For service information please contact Josephson at 831 420 0888 Repair shipments may be...

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