BHI NEIM 1031 MKII User manual

Page 1
Amplified DSP Noise Eliminating
In-Line Module
1031-106D
IssueF
bhi
NEIM 1031 MKII
DSP Noise Cancelling Products from bhi
Page 24
bhi
bhi Ltd
22 Woolven Close
Burgess Hill
West Sussex
RH159RR
England
Telephone: + 44 (0)1444 870333
Skype: bhi-sales
email: [e-mail]
web: www.bhi-ltd.com
DSP Noise Cancelling Products from bhi

Page 2
Important Information
Copyright
This publication, including all photographs and illustrations
isprotectedunderinternational copyrightlaws, withall rights
reserved. Neitherthis manual,nor anyof thematerial within,
maybecopied orreproduced without thewritten consentof
bhi Ltd.
Disclaimer
Theinformation inthisdocumentissubject tochangewithout
notice. bhiLtdmakes norepresentations orwarranties with
respectto thecontentshereofandspecificallydisclaimsany
implied warranties of merchantability or fitness for any
particular purpose. Furthermore, bhi Ltd reserves the right
to revise this publication and to make changes from time to
time in the content hereof without obligation of bhi Ltd to
notifyany personofsuch revisionorchanges.TheNEIM1031
MKII may be connected to audio recording equipment. The
user is responsible for complying with any copyrights, or
legislationregarding recordingof material.
Weee Statement for correct disposal of this product:
(Applicable in the European Union and other European
countries with separate collection systems). This marking
shown on the product or its literature, indicates that it
should not be disposed of with other household wastes at
the end of its working life. To prevent possible harm to the
environment or human health from uncontrolled waste
disposal, please separate this from other types of wastes
and recycle it responsibly to promote the sustainable reuse
of material resources. Household users should contact either
the retailer where they purchased this product, or their local
government office, for details of where and how they can
take this item for environmentally safe recycling. Business
users should contact their supplier and check the terms and
conditions of the purchase contract. This product should not
be mixed with other commercial wastes for disposal.
Page 23
Notes:
9. bhi Support
TheNEIM1031MKIIDSPnoiseeliminatingin-linemodule
comes with a 12 month guarantee against defective
materialsandworkmanship.
If you do have a problem then please refer to the
troubleshootingguide(section6).Ifyouhavenotresolved
your problem then please contact us.
Before you make your call please have the following
information to hand:
√Yourserialnumber (found ontheback of the
NEIM1031MKII)
√Detailsofwhen and whereyoupurchased the
module
See our website for FAQs, otherwise most queries can
be resolved over the telephone, if not we will arrange
withyou to have your NEIM1031MKII sentback to us for
analysis,repair or replacement (if within 12months from
date of purchase, if outside the guarantee period an
estimate of the cost of repair will be given).
For contact details please refer to the back cover of this
manual.
If you have any suggestions for improvements please
complete and return the customer feedback form.
Note:
Opening the case will void the warranty. No user
serviceable parts inside.

Page 3
Contents
1. Introduction 4
2. Packing List 4
3. Connections 5
3.1 Connector description 5
3.2 Connectorlayout 6
3.3 Typical connections 7
3.4 Radio communications 8
3.5 Audio restoration 9
3.6 Surveillance/CCTV/Video 10
3.7 Recording using a PC sound card 11
3.8 Connecting several audio sources 12
4. Controls 13
4.1 Controllayout 13
4.2 Control functions 14
5. Setup 16
5.1 Signal levels 16
5.2 Noise cancellation 16
6. Troubleshooting/FAQs 18
7. Specifications 19
8. Accessories 21
8.1 Power 21
8.2 Audio 21
8.3 Audio adaptors 22
8.4 Headphoneadaptors 22
9. bhi Support 23
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8.3 Adaptors for connecting NEIM1031MKII to
other equipment.
8.4 Adaptors for connecting earphones/head
phones to NEIM1031.

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3. Connections.
All audio connections are at the rear of the unit. The
headphone connection has been placed at the front of
the unit for easy access.
As the audio signals are bypassed when the power is
removed there is no need to disconnect the unit when
not in use.
The diagram on the following page shows the position
of all the connectors.
3.1 Connector Description:
Line In: Phono socket.
Low level audio input.
Audio In: 3.5mm mono jack socket.
Speaker level input (for example an
extension speaker socket).
DC Power: 2.1mm power connector. Centre +Ve.
12-24VDC 500mA Input.
Headphone: 3.5mm mono jack socket.
Amplified output. This connection
over rides the audio out socket. This
socket may also be used to drive an
extension speaker.
Audio out: 3.5mm mono jack socket
Amplified output to drive an extension
speaker. This socket is disabled when
the headphone socket is used.
Page 20
DC power: 12-24 VDC
500mA
DC connector: 2.1mm power
connector
(centre +ve)
Size: 170 x 85 x 34mm
Weight: 265 gms

Page 6
7
10
7
10
Connections
NEIM1031
Overload
Output Level
Input Level
Line Out Level
Noise Eliminating In-Line Module
4
2
3
1
Power
56
Off On
OK
2
1
3
45 6
Out
Audio
Headphone Socket
Noise Cancellation
9
8
Filter Level
On
bhi
0=MIN
9
8
7=MAX
12-24VDC Input
Input Selector
+-
AudioLine In Line
Audio In
Line In
Audio out
Line out
3.2 Connector Layout.
DC Power
Supply
Headphones
(or extension speaker)
Line out: Phono socket
Low level audio out. For connection to
an amplifier, recorder, or any other line
level device.
Top View
Page 19
7. Specifications.
Noise attenuation: 9 - 35dB
Noise attenuation levels 8
Level Attenuation
1 9dB
2 11dB
313dB
415dB
517dB
620dB
724dB
835dB
Tone rejection 65dB max
Audiooutput power 2.7W RMSmax.
Audio bandwidth 50Hz - 4.6KHz (-3dB)
Audio connections:
Line level in/out RCA phono
Audio in/out 3.5mm mono jack
Line input impedance 10K
Line output impedance 100R
Line in sensitivity 300mV - 2V rms
Headphone socket 3.5mm mono jack
Headphone power 2.5W rms max.