The ATT30 is intended to interface a low impedance speaker output to a high
impedence balanced line input such as those found on Ampetronic preamplifiers
and induction loop amplifiers. The unit provides a balanced resistive attenuation
of -30dB.
The standard version of the ATT30 is not suitable for use with unbalanced or low
impedance inputs, nor should it be connected to microphone inputs of any type. It
should not be used with 100V line speaker systems; use the ATT100 instead.
1. Speaker output connection
The speaker output 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
ATT30. Similarly, the polarity of the speaker connections is not critical.
Do NOT insert the 3-pin plug into theATT30 at this stage.
ATT30
30 Volt Adapter
+
-
FROM
SPEAKER
OUTPUT
SAFETY
EARTH
(IF FITTED)
INSIDE VIEW OF CONNECTOR
}
2. Output connection.
The ATT30 should be plugged directly into the line level input of the amplifier or
preamplifier. This input must be balanced and high impedance. Note the
restrictions on use at the head of this sheet.
Under no circumstances should the output be extended, not even using a
screened cable. The connection is high impedance and would be susceptible to
interference.
When the ATT30 has been connected to the equipment input, the 3-pin plug from
the speaker line may be inserted into the ATT30. The unit is now installed and
ready for use.
The ATT30 contains connections to speaker systems which may carry hazardous
voltages. If any damage to the unit is visible do not use the ATT30, 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 (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.
TheATT30 is designed and manufactured in England byAmpetronic Ltd.
DECLARATION OF CONFORMITY
Manufacturer: Ampetronic Ltd.
Address: Northern Road, Newark,
Nottinghamshire, NG24 2ET.
United Kingdom.
Declares that the product:
Description: Low Impedance Speaker LineAdapter
Type Name: ATT30
Conforms to the following Directive(s) and Norm(s):
Directive 2004/108/EC
EMC: EN55103-1 : 2009 Emission
EN55103-2 : 2009 Immunity
Directive 2006/95/EC
Safety: EN60065 : 2002
Date: December 2011
J.R. Pieters
Managing Director
Ampetronic Ltd.
www.ampetronic.com
UP11101-4
Ampetronic Ltd,
Northern Road, Newark,
Nottinghamshire, NG24 2ET
United Kingdom
Tel: +44 (0) 1636 610062 Fax: +44 (0) 1636 610063
