Nakamichi CM 300 Owners Manual

Page 2

The Nakamichi CM-300 is a studio quality electret
condenser microphone providing the following per-
formance characteristics and featmes:

~ uniform frequency response

- high sensitivity

- wide dynamic range

~ low distortion and coloration

- ruggedness and dependability

~ self-contained power supply and preamplifier
- interchangeable capsules

- built-in 10 dB pre»e|ectronics attenuator

- built-in proximity effect compensator

1. Battery installation

Remove the attenuator housing by unscrewing it.
install the battery (supplied with microphone) with the
positive (+i terminal facing the front of the micro
phone. Make sure that the rubber end sleeves are on
the ends of the battery - this will ensure a snug fit in»
side the microphone body. Battery life is approximate-
ly 220 hours of continuous use (longer for intermittent
use). The 9.1V Mercury battery (type H-7D/A) may be
replaced with the more readily available Mallory type
TR»126 (or Eveready E426). When using the latter, it
will not be necessary to use the rubber end sleeves.

2. Cable Connection
The cable supplied with the CM-3OO is wired for
unbalanced operation, making the microphone im-
mediately compatible with the microphone inputs
found on Nakamichi cassette decks or any low

impedance unbalanced phone jack mic inputs.
Balanced lines should be avoided unless absolutely
necessary (due to noise pick-up problems) since input
transformers necessitated by balanced lines inevitably
introduce coloration. Where balanced lines cannot be
avoided, the CM-300 may be used with standard
2-conductor-plus-shield cable, terminating at the
microphone end in a female Cannon XLR (3) type
connector, to provide a fully balanced 200 ohm
system.

3.

Off-Fiat-Lo Cut" Switch

Always leave this switch in the "off" position when
the CM-300 is not in use to conserve battery power.
For normal applications use the microphone in the
flat" mode. When close-miking with the cardioid
(CF-l) capsule, push the switch into the "L0 Cut"
position. This will provide compensation for pro-
ximity effect as shown in the frequency response
diagram.

CP-l

F

mum :iB

CP-2

requency Response

t

:K . .
F'tmlrncv ii:

interchange the electret elements in the following
manner:
1. Remove existing capsule by unscrewing it from
attenuator housing. (see exploded view)
2. Attach desired capsule in reverse process.
00 NOT OVERTIGHTEN.

4. Attenuator Operation
It may become necessary under high sound level
applications to attenuate the signal going to the - ~ - .
CM-300 preamplifier housed in the body. Access to Spectflcations.
the built-in 10 dB pad is gained by unscrewing and , 7 . or: I Lam-mm mummifi
removing the capsule. Using a thin stylus, move the F'mmcvfiwne 77 3° 'fiWHVEEB . 2° VGDDDHX'JMS,
lever to the desired position as shown on the °W""°W=WL 790 Balms g
diagram below ifilllvllV (lkHIOdB : (Vp Dari i r76d87'725dfi
Attenuation Pod mas
Wngmaai Betterthan same 7
. MaximumSPL At iiDnstort-on i iJEdE --» 7
Current Consumption Lest than MA
MB -lOdB Overalmngullag! i 777v iov cc:
Battery 5 A or 9 IV ercmy
Dynumrc Range gene: inan lNdEV 7
7 LowCur JDnEIOVOHVIV 77
Included Accessories
1. Connecting Cable (XLR to phone)
2. Battery
3. Stand Adaptor
4, Windscreen
5. CP-1 Cardioid Capsule
6. CP-Z Omnidirectional Capsule
5. Interchanging Capsules 7, Foam padded case
8

.Vinyl gadget bag" carrying case (included with

CM-300 x 3 tri-microphone set only)

Optional Accessories

1.
2.

CP-3 Super- omnidirectional pinpoint Capsule
CP-4 Super-directional shotgun Capsule