Interspace Industries PXB User manual

8
28 High Street
Arlesey
Bedfordshire
SG15 6RA
UK
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.interspaceind.com
Cueing and Presentation Control Specialists
PXB
User Manual

2
Contents
Introduction 3
Safety Instructions 4
SettingUp 5
Operating Instructions 6
Equipment Supplied 7
Technical Support Contact 7
7
For Technical Support or Sales Enquiries:
Interspace Industries Head Office:
[phone]
Emergency Technical Support Hot Line:
[phone]
Website:
www.interspaceind.com
Stereo / Mono Switch
This allows the combining of both left and right stereo channels via an
internal resistive network to protect the source device (output drivers). A
600 ohm, high bandwidth audio transformer provides a fully balanced
output.
Earth Lift
Using PXB it is possible to isolate the computer or consumer audio source
device earth system to defeat possible hum loops. When using the Earth
lift feature it is essential however that the receiving equipment (i.e. the
sound desk) has a reliable balanced input earth.

6
Operating Instructions
PXB is a totally passive - no batteries or external power supply is required.
It provides a simple means of connecting a computer or consumer audio
source to a professional sound system.
Fig 1. Connection Diagram
Pad Switch
Ideal for interfacing line:mic levels in either direction, the pad switch will
attenuate the audio level between input and output by approx 20dB via a
resistive network.
As this unit is passive, it is possible to use it as a line level input to com-
puters with a 3.5mm stereo jack microphone input. This will need to be
checked thoroughly first however. Ensure the pad switch is ‘on’ and the
unbalanced input on the PXB is connected to the computer mic input.
Balanced audio can then be connected from the sound desk to the output
of the PXB. This will enable balanced transmission to unbalanced recep-
tion, thereby reducing line-induced hum.
3
Introduction
PXB is a high bandwidth multipurpose audio interfacing tool designed to
address a multitude of audio needs in the professional AV market.
Features include:
• Phono and XLR input options - ideal for interfacing consumer or
computer audio sources.
• High bandwidth with an insertion loss of approx 2dB.
• Bi-directional balancing - simple conversion of unbalanced stereo audio
to balanced stereo, in either direction.
• -20dB pad switch - attenuation in case of needing to switch between line
and mic levels.
• Stereo to mono switch - simple conversion of stereo to mono.
• Ground lift - switchable grounding on outputs to cure induced hum or
cross-talk effects.
• Passive adaptor - no external or battery power required.
PXB - The AV Professional’s Toolkit!
We hope that PXB exceeds your expectations and welcome any feedback
that you have about this or any of our products.
Thank you.
The Interspace Industries Team
www.interspaceind.com

4
Safety Instructions
All the safety and operating instructions should be read before this product
is operated and should be retained for further reference. Please adhere to
all the warnings on this product and in these operating instructions. Please
follow these instructions carefully:
Power. Only use the power source indicated on the device. Devices
equipped with a grounded plug should only be used with a grounded type
outlet. In no way should this grounding be disconnected, modified or
suppressed.
Power Supply Cord (where applicable). To unplug the device, do not
pull the power supply cord but always the plug itself. The power source
outlet should always be near the MasterCue main unit and easily
accessible. Ensure the power supply cord cannot be walked on or
damaged by items placed on or against it. Do not use if the power
supply cord is damaged. Using the device with a damaged power supply
cord may expose you to electric shock or other hazards. Check the
condition of the power supply cord regularly. Contact your dealer or
service centre immediately for a replacement if damaged.
Keep Away From Harmful Substances. To prevent the risk of electric
shock and fire, do not expose this device to rain, humidity or intense heat
sources (such as radiators or direct sunlight). Avoid using this equipment
in environments where there is excessive heat, dust, moisture, chemicals,
vibration or mechanical shocks.
Slots and Openings. These are designed into the device for ventilation
and to avoid overheating. Always ensure these openings remain clear. Do
not attempt to insert anything into these openingsunder any
circumstances. If liquids have been spilled on, or objects have fallen into
the product it must be checked by a qualified technician before re-using.
5
Connections. All inputs and outputs (except for power input) are TBTS
defined under EN60950.
• DO NOT OPEN SYSTEM DUE TO POSSIBLE HIGH
VOLTAGE.
• DO NOT IMMERSE IN WATER.
If you have any queries regarding these safety instructions or how to
maintain the unit, please do not hesitate to contact us on:
[phone]
Servicing. Do not attempt to service this product yourself. Opening or
removing covers and screws may expose you to electric shocks or other
hazards. Refer all servicing to qualified service personnel.
Federal Communications Commission
NOTE: This equipment has been tested and found to comply with
the limits of a Class A digital device, Pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at their
own expense.