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Belt-Pack 4-Wire Headphone Amp
For the latest Sonifex handbook information please visit the Sonifex website at www.sonifex.co.uk
This handbook is for use with the following product:
CM-BH4W Beltpack Belt-Pack 4-Wire Headphone Amp.
Stock Code: 30-292
©Sonifex Ltd, 2019
All Rights Reserved
Revision 1.03, November 2019
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: +44 (0)1933 650 700
Fax: +44 (0)1933 650 726
Email: sales@sonifex.co.uk
Website: https://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a commitment
on the part of the vendor. Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from
the use of information or any error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying, recording, information storage and retrieval systems, for any purpose
other than the purchaser’s personal use, without the express written permission of Sonifex Ltd. Unless
otherwise noted, all names of companies, products and persons contained herein are part of a completely
fictitious adaptation and are designed solely to document the use of Sonifex product.
Made in the UK by
Product:
Serial No:
As standard, Sonifex products are supplied with a 1 year back to base warranty.
In order to register the date of purchase and so that we can keep you informed
of any product design improvements or modifications, it is important to
complete the warranty registration online. Additionally, if you register the
product on the Sonifex website, you can increase your product warranty to 2
years. Go to the Sonifex website at: www.sonifex.co.uk/register to apply for
your 2 year warranty.
‘the Company’ means Sonifex Ltd and where relevant includes companies within
the same group of companies as Sonifex Limited.
‘the Goods’ means the goods or any part thereof supplied by the Company and
where relevant includes: work carried out by the Company on items supplied by
the Purchaser; services supplied by the Company; and software supplied by the
Company.
‘the Purchaser’ means the person or organisation who buys or has agreed to
buy the Goods.
‘the Price’ means the Price of the Goods and any other charges incurred by the
Company in the supply of the Goods.
‘the Warranty Term’ is the length of the product warranty which is usually
12 months from the date of despatch; except when the product has been
registered at the Sonifex website when the Warranty Term is 24 months from
the date of despatch.
‘the Contract’ means the quotation, these Conditions of Sale and any other
document incorporated in a contract between the Company and the Purchaser.
This is the entire Contract between the parties relating to the subject
matter hereof and may not be changed or terminated except in writing in
accordance with the provisions of this Contract. A reference to the consent,
acknowledgement, authority or agreement of the Company means in writing
and only by a director of the Company.
a. The Company agrees to repair or (at its discretion) replace Goods which
are found to be defective (fair wear and tear excepted) and which are
returned to the Company within the Warranty Term provided that each of
the following are satisfied:
i. notification of any defect is given to the Company immediately
upon its becoming apparent to the Purchaser;
ii. the Goods have only been operated under normal operating
conditions and have only been subject to normal use (and in
particular the Goods must have been correctly connected and
must not have been subject to high voltage or to ionising radiation
and must not have been used contrary to the Company’s technical
recommendations);
iii. the Goods are returned to the Company’s premises at the
Purchaser’s expense;
iv. any Goods or parts of Goods replaced shall become the property of
the Company;
v. no work whatsoever (other than normal and proper maintenance)
has been carried out to the Goods or any part of the Goods without
the Company’s prior written consent;
vi. the defect has not arisen from a design made, furnished or specified
by the Purchaser;
vii. the Goods have been assembled or incorporated into other goods
only in accordance with any instructions issued by the Company;
viii. the defect has not arisen from a design modified by the Purchaser;
ix. the defect has not arisen from an item manufactured by a person
other than the Company. In respect of any item manufactured
by a person other than the Company, the Purchaser shall only be
entitled to the benefit of any warranty or guarantee provided by
such manufacturer to the Company.
b. In respect of computer software supplied by the Company the Company
does not warrant that the use of the software will be uninterrupted or
error free.
c. The Company accepts liability:
(i) for death or personal injury to the extent that it results from the
negligence of the Company, its employees (whilst in the course of
their employment) or its agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as
to title, quiet possession and freedom from encumbrance.
d. Subject to conditions (a) and (c) from the time of despatch of the Goods
from the Company’s premises the Purchaser shall be responsible for any
defect in the Goods or loss, damage, nuisance or interference whatsoever
consequential economic or otherwise or wastage of material resulting
from or caused by or to the Goods. In particular the Company shall not
be liable for any loss of profits or other economic losses. The Company
accordingly excludes all liability for the same.
e. At the request and expense of the Purchaser the Company will test the
Goods to ascertain performance levels and provide a report of the results
of that test. The report will be accurate at the time of the test, to the best
of the belief and knowledge of the Company, and the Company accepts
no liability in respect of its accuracy beyond that set out in Condition (a).
f. Subject to Condition (e) no representation, condition, warranty or
other term, express or implied (by statute or otherwise) is given by
the Company that the Goods are of any particular quality or standard
or will enable the Purchaser to attain any particular performance or
result, or will be suitable for any particular purpose or use under specific
conditions or will provide any particular capacity, notwithstanding that
the requirement for such performance, result or capacity or that such
particular purpose or conditions may have been known (or ought to have
been known) to the Company, its employees or agents.
g. (i) To the extent that the Company is held legally liable to the
Purchaser for any single breach of contract, tort, representation
or other act or default, the Company’s liability for the same shall
not exceed the price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to any
liability accepted by the Seller in Condition (c).
h. Where the Goods are sold under a consumer transaction (as defined by
the Consumer Transactions (Restrictions on Statements) Order 1976) the
statutory rights of the Purchaser are not affected by these Conditions of
Sale.
Each product is shipped in protective packaging and should be inspected for
damage before use. If there is any transit damage take pictures of the product
packaging and notify the carrier immediately with all the relevant details of the
shipment. Packing materials should be kept for inspection and also for if the
product needs to be returned.
The product is shipped with the following equipment so please check to ensure
that you have all of the items below. If anything is missing, please contact the
supplier of your equipment immediately.
Item Quantity
Product unit 1
A3 Folded Handbook 1
Please contact Sonifex or your supplier if you have any problems with your
Sonifex product. Email technical.support@sonifex.co.uk for the repair/upgrade/
returns procedure, or for support & questions regarding the product operation.
The products in this manual comply with the essential requirements of the
relevant European health, safety and environmental protection legislation.
The technical justification file for this product is available at Sonifex Ltd.
The declaration of conformity can be found at:
https://www.sonifex.co.uk/declarations
The Waste Electrical and Electronic Equipment (WEEE) Directive
was agreed on 13 February 2003, along with the related Directive
2002/95/EC on Restrictions of the use of certain Hazardous
Substances in electrical and electronic equipment
(RoHS). The Waste Electrical and Electronic Equipment Directive (WEEE)
aims to minimise the impacts of electrical and electronic equipment on the
environment during their life times and when they become waste. All products
manufactured by Sonifex Ltd have the WEEE directive label placed on the case.
Sonifex Ltd will be happy to give you information about local organisations that
can reprocess the product when it reaches its “end of use”, or alternatively all
products that have reached “end of use” can be returned to Sonifex and will be
reprocessed correctly free of charge.
This apparatus should be installed in an area that is not subject to excessive
temperature variation (<0°C, >50°C), moisture, dust or vibration.
This apparatus shall not be exposed to dripping or splashing, and no objects
filled with water, such as vases shall be placed on the apparatus.
5 6 7 8
Fig 1-1: CM-BH4W Belt Pack Headphone Amplifier 4 Wire
The CM-BH4W is a portable, battery powered 4 wire beltpack for use in talkback
and IFB applications, providing two-way communication with a wide range of
studio equipment, including the Sonifex CM-TB8.
The built in automatic gain control (AGC) ensures a constant line output level is
maintained for a wide range of headset microphones, and in IFB mode the input
audio is passively switched to the output when the talk button is not pressed,
giving a fail-safe audio path through the unit.
A low battery warning LED flashes when the 9V PP3 battery has depleted to
6V, giving plenty of notice to swap the battery. The low power circuitry of the
CM-BH4W gives up to 150 hours use from a single alkaline 9V PP3 battery,
and removing the jack plug from the headset socket switches the unit off to
conserve battery life.
Fig 1-2: CM-BH4W Block Diagram
Fig 2-1: Top Panel View of CM-BH4W
The headset connector is a ¼” jack socket that provides an unbalanced
microphone input alongside an unbalanced, mono headphone output. The
socket has the following connections:
Tip: Headphone Output
Ring: Microphone Input
Screen: Headphone/Microphone Common
Volume Control
The volume control modifies the headphone output volume, giving up to 10dB
of gain for low level line inputs. The control also acts as a power switch, turning
the unit off when fully anticlockwise.
Should the battery voltage fall below 6V, the 3mm red low battery indicator will
flash, warning you that the battery should be changed as soon as possible to
prevent failure.
The TALK button routes the microphone audio via an automatic gain control
(AGC) circuit to the line output. The AGC maintains the output level at +2dBu
for a wide range of microphone input levels. The TALK switch can be set as a
momentary or latching switch by inserting/removing an internal pin (set as
momentary by default). Contact Sonifex for more information on this.
The mode of operation is set using the 4 wire/IFB mode switch.
• In 4 wire mode, the line output remains silent until the TALK button is
pressed.
• In IFB mode, the line input is routed to the line output until the TALK button
is pressed, after which it is interrupted by the microphone audio.
Fig 2-2: Side Panel View of CM-BH4W
Fig 2-3: Bottom Panel View of CM-BH4W
The audio connections are found on the bottom panel, and both have the
following connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase
The line input is a transformer balanced audio input with >10kΩ input
impedance. The line input can accept input levels of up to +24dBu.
The line output is either a direct connection to the line input (if IFB mode is set
and talk is not pressed) or is a transformer balanced audio output containing
post AGC microphone audio.
This is a version of the CM-BH4W with a 4 pin XLR headset connection instead
of a stereo jack connector. In all other respects it is the same as the CM-BH4W.
Fig 2-4: Top Panel View of CM-BH4WX
The XLR connections are:
Pin 1: Microphone non-phase (-)
Pin 2: Microphone phase (+)
Pin 3: Headphone non-phase (-)
Pin 4: Headphone phase (+)
Mic In to Line Out
Mic Input Impedance: 1k5Ω Unbalanced for 200Ω dynamic microphone
Limiter Input Threshold: -60dBu
Line Output Level: +2dBu
Line Output Impedance: 150Ω Transformer balanced
Line In to Headphone Out
Line Input Impedance: >10kΩ Transformer balanced
Input Gain/Volume: Adjustable off to +10dB
Maximum Input Level: +24dBu
Maximum HP Output Level: +7dBu (ref 9V battery voltage, <1% THD, 100Ω
load)
Minimum HP Impedance: 100Ω
Connections
Line Input: 1 x XLR 3 pin female socket (balanced)
Line Output: 1 x XLR 3 pin male plug (balanced)
Headset (CM-BH4W): 1 x ¼” (6.35mm) mono unbalanced jack socket
Headset (CM-BH4WX): 1 x XLR 4 pin male plug (balanced)
Equipment Type
CM-BH4W: Belt-pack 4-wire headphone amplifier
CM-BH4WX: Belt-pack 4-wire headphone amplifier with 4 pin
XLR headset connector
Physical Specification
Dimensions (Raw): 12.5cm (W) x 6.7cm (D) x 4.8cm (H)
4.9” (W) x 2.6” (D) x 1.9” (H)
Dimensions (Boxed): 23cm (W) x 13cm (D) x 8cm (H)
9.1” (W) x 5.1” (D) x 3.1” (H)
Weight: Nett: 0.3kg Gross: 0.4kg
Nett: 0.6lbs Gross: 1.0lbs
Line input
Low
battery
Headset
Tip - HP
Ring - MIC
Volume
Talk
<6V
Off/On
Line output AGC
4 Wire/IFB
Talk
CM-TB8 Channels 1, 3, 5 & 7 in IFB Mode with IFBA sent
All CM-BH4Ws in 4-Wire Mode
Line
Out
Line
In
Line
Out
Line
In
Line
Out
Line
In
Line
Out
Line
In
All CM-BH4Ws in IFB Mode
IFB IN
Line
Out
Line
In
Line
Out
Line
In
Line
Out
Line
In
Line
Out
Line
In
CM-TB8 Channels 1, 3, 5 & 7 in 4-Wire Mode
CM-TB8 Channel 1 in 4-Wire Mode
All CM-BH4Ws in IFB Mode
Line
Out
Line
In
Line
Out
Line
In
Line
Out
Line
In
Line
In

Produktspecifikationer

Varumärke: Sonifex
Kategori: mottagare
Modell: CM-BH4W

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