The ATT100-T74 is designed to interface a 100V line speaker system to a
balanced microphone input such as those found on many Ampetronic induction
loop amplifiers. The unit provides a transformer isolated attenuation of 70dB.
Restrictions on usage
The ATT100-T74 is not suitable for use with line level inputs. It should only be
connected to inputs intended for balanced microphones. Ensure that the phantom
power on the microphone input is switched off.
1. Output connection.
The ATT100-T74 should be plugged directly into the microphone input of the loop
amplifier. Note the restrictions listed above.
Under no circumstances
should the output be extended, not even using a
screened cable. The extended connection would be susceptible to interference.
ATT100-T74
Adapter
+
-
100V
LINE
SAFETY
EARTH
(IF FITTED)
INSIDE VIEW OF CONNECTOR
}
2. 100V line connection
The 100V speaker line should be connected to the 3-pin input plug as shown
below.
The safety ground connection is not essential and does not connect through the
ATT100-T74. Similarly, the polarity of the 100V line connections is not critical.
Plug into ATT100-T74.
Adjust Input Gain on amplifier as required.
Safety Notice
The ATT100-T74 contains connections to speaker systems which may carry
hazardous voltages. If any damage to the unit is visible do not use the ATT100-
T74, but switch off all attached systems and disconnect the unit from them before
switching on again. Never attempt to open or modify the unit.
Warranty Information
This product carries a five year parts and labour warranty from date of shipment
from Ampetronic. To qualify for the five year warranty, the product must be
registered at www.ampetronic.com (products/warranty), without which the
warranty will be valid for two years only.
The warranty could be invalidated if the instructions in this handbook are not
followed correctly, or if the unit is misused in any way.
ATT100-T74 is designed and manufactured in England by Ampetronic Ltd.
DECLARATION OF CONFORMITY
Manufacturer:
Ampetronic Ltd.
Address:
Northern Road, Newark,
Nottinghamshire, NG24 2ET.
United Kingdom.
Declares that the product:
Description:
Input Adapter
Type Name:
ATT100-T74
Conforms to the following Directive(s) and Norm(s):
Directive 2004/108/EC
EMC:
EN55103-1 (2009)
EN55103-2 (2009)
Directive 2006/95/EC
Safety: EN60065 (2002)
Jan 2011J.R. Pieters
Managing Director
Ampetronic Ltd.
UP13009-1
Ampetronic Ltd,
Northern Road, Newark,
Nottinghamshire, NG24 2ET
United Kingdom
Tel: +44 (0) 1636 610062 Fax: +44 (0) 1636 610063
www.ampetronic.com Email: sales@ampetronic.com
