XTA apa-4e8 User manual

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APA-4E8 Operator’s Manual Page 3
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CONTENTS
THANKS
THANKSTHANKS
THANKS ................................
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INTRODUCTION
INTRODUCTIONINTRODUCTION
INTRODUCTION ................................
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IMPORTANT SAFETY
IMPORTANT SAFETY IMPORTANT SAFETY
IMPORTANT SAFETY INSTRUCTIONS
INSTRUCTIONSINSTRUCTIONS
INSTRUCTIONS ................................
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INSTRUCTIONS DE SECU
INSTRUCTIONS DE SECUINSTRUCTIONS DE SECU
INSTRUCTIONS DE SECURITE IMPORTANTES
RITE IMPORTANTESRITE IMPORTANTES
RITE IMPORTANTES ................................
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DECLARATION OF CONFO
DECLARATION OF CONFODECLARATION OF CONFO
DECLARATION OF CONFORMITY
RMITYRMITY
RMITY ................................
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INSTALLING YOUR APA:
INSTALLING YOUR APA:INSTALLING YOUR APA:
INSTALLING YOUR APA: ................................
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1111
11
Unpac ing 11
Electrical Considerations 12
Mechanical Considerations 13
CONNECTING TO YOUR A
CONNECTING TO YOUR ACONNECTING TO YOUR A
CONNECTING TO YOUR APA:
PA:PA:
PA: ................................
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1414
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Audio Inputs Wiring 14
RS485 Output Wiring 14
Spea er Outputs Wiring 15
GETTING TO KNOW YOUR
GETTING TO KNOW YOURGETTING TO KNOW YOUR
GETTING TO KNOW YOUR APA:
APA:APA:
APA: ................................
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Front Panel Layout and Controls 16
Rear Panel Controls and Soc ets 18
Rear Panel Status LED Groups 19
GPIO Connections 19
Signal Paths and Bloc Diagram 20
Input Sources 21
AES Inputs 21
Pre-Matrix Processing 22
Processed Input Channel Bloc s 23
Mix Matrix to Power Amp Processing Channels / Networ Outputs 24
Power Amp Channels Processing Bloc s 25

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OPERATING YOUR APA:
OPERATING YOUR APA:OPERATING YOUR APA:
OPERATING YOUR APA: ................................
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2727
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Powering Up 27
Powering Down and Returning Home 28
Home Screen Layout 29
The “Monochrome Concept” 29
User Metrics 30
ncoming Mains Monitor 30
Amplifier Temperatures 31
Quick nputs Monitor 32
Amp Channel Loads 33
Auto Scrolling of User Metrics 34
Tri Colour Panel Metering 35
Output Channel Menu 36
Overview 36
Quick Gain Trim 36
Output Preset 37
Limiter Threshold 37
Output Polarity (Phase Reverse) 37
System Menu 38
Overview 38
UNDERSTANDING YOUR A
UNDERSTANDING YOUR AUNDERSTANDING YOUR A
UNDERSTANDING YOUR APA
PAPA
PA ................................
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Memories, Presets and File Structures 39
nternal SD Card 39
USB Flash Drives: Firmware Upgrades and Presets/Memories 39
The Concept of File Syncing 41
Recalling Unit Memories 42
Upgrading Firmware via USB 44
Mains RMS Current Limiter 47
Identify Unit 48
Default Audio 48
Default User Settings 49
Emergency Voice Evacuation Playbac 50
System Security 51
Overview and Locking Procedure 51
Forgotten Your Password? 51
SYSTEM WARNINGS
SYSTEM WARNINGSSYSTEM WARNINGS
SYSTEM WARNINGS ................................
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REMOTE CONNECTION TO
REMOTE CONNECTION TOREMOTE CONNECTION TO
REMOTE CONNECTION TO YOUR APA
YOUR APAYOUR APA
YOUR APA ................................
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Overview 54
Connect to a Network 54
Adhoc Connections (no DHCP Server) 55
Manual (fixed) P Address Selection 55
LOOKING AFTER YOUR A
LOOKING AFTER YOUR ALOOKING AFTER YOUR A
LOOKING AFTER YOUR APA:
PA:PA:
PA: ................................
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Maintenance 57
Warranty 57
PERFORMANCE OF YOUR
PERFORMANCE OF YOUR PERFORMANCE OF YOUR
PERFORMANCE OF YOUR APA:
APA:APA:
APA: ................................
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Technical Specifications 58
General 58
Audio System 58
Digital Audio 59
Storage & Losses 59
Physical and Mechanical 59
nput Power 60
Output Power: Peak Performance 60
Output Power: Continuous Performance 61
Power Measurement Test Types 62
Test type 1: Continuous RMS Sine Wave 62
Test type 2: Continuous Pink Noise 62
Test type 3: Short Burst Sine Wave 62
Test type 4: Long Burst Sine Wave 62

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ADDITIONAL INFORMATI
ADDITIONAL INFORMATIADDITIONAL INFORMATI
ADDITIONAL INFORMATION ABOUT YOUR APA:
ON ABOUT YOUR APA:ON ABOUT YOUR APA:
ON ABOUT YOUR APA: ................................
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Appendix I: Dynamic EQ 63
Mode : “Cut Above” 63
Mode : “Cut Below” 64
Mode : “Boost Above” 65
Mode V: “Boost Below” 66
Appendix II: Program Limiter and Pea Limiter 67
Program Limiter 67
Peak Limiter 68
Setting Accurate Limiter Thresholds — Program Limiter 70
Setting Accurate Limiter Thresholds — Peak Limiter 71
Setting Appropriate Attack and Release Times 71
Appendix III: Parametric Filter Types and Uses 72
Standard Parametric EQ 72
High/Low Shelving EQ 73
Creating a Flat-topped EQ Response 73
Bandpass Filter 74
Notch Filter 74
All Pass Filter 75
Phase Filter 75
Low/High Pass Variable ‘Q’ Filter 76

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Than s
Than sThan s
Than s
Thank you for choosing the APA-4E8 adaptive processing amplifier for your application.
Please spend a little time reading through this manual, so that you obtain the best possible
performance from the unit and become familiar with its operating requirements.
All XTA products are carefully designed and engineered for cutting-edge performance and
world-class reliability. f you would like further information about this or any other XTA
product, please contact us.
We wish you many years of flawless service from this unit and look forward to hearing from
you in the near future.
I
II
Introduction
ntroductionntroduction
ntroduction
The APA Series — Adaptive Processing Amplification — are four channel Class D amplifiers
with extensive processing, connectivity and control capabilities. The new power and DSP
platforms have been designed to interact intelligently and adapt to prevailing conditions,
protecting drivers, and significantly enhancing performance from all speaker systems.
The power stages and processing tightly integrate with the power supply featuring 96k
analogue to digital converters not only on the analogue inputs but also directly at the speaker
outputs, monitoring voltage and current. nputs and outputs are simultaneously being
processed by the DSP, along with data about the mains supply, allowing the APA to adapt and
correct to keep your music sounding better than ever.
n addition to this adaptive processing, you still have full control over a powerful suite of
filtering and protection, including multiple bands of our legendary dynamic EQ, F R filtering
and phase linearisation, ultra-transparent compression and limiting, plus all the classic
crossover and EQ components traditionally used to set up your system.
Add to this a fully flexible matrix with the ability to source audio either locally from AES or
analogue inputs, or via a networked audio connection (Dante/AVB). With native Mac and PC
remote software also available, you’ll understand why we don’t think this is just an amplifier
with some DSP built in…

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Import
ImportImport
Important Safety Instructions
ant Safety Instructionsant Safety Instructions
ant Safety Instructions
CAUT ON: R SK OF ELECTR C SHOCK.
DO NOT OPEN
WARN NG: Apparatus with CLASS construction shall be connected to a MA NS socket outlet with a protective
earthing connection.
WARN NG: To prevent injury, this apparatus must be securely attached to the rack in accordance with the
installation instructions.
1.
Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings, install in
accordance with the manufacturer’s instructions.
8. Do not install near any heat sources, such as
radiators, heat registers, stoves or other apparatus
(including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. f
the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience
receptacles and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the
manufacturer.
12. Use only with the cart, tripod, bracket or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury
from a tip over.
13. Unplug this apparatus during lightning storms or
when unused for a long period of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as if the power-supply cord or
plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally,
or has been dropped.
15. Do not expose this equipment to dripping or
splashing and ensure that no objects filled with liquids,
such as vases, are placed on the equipment.
16. To completely disconnect this equipment from the
AC mains, disconnect the power cord from the mains
circuit breaker.
17. This unit is fitted with a 3-wire power cord. For
safety reasons, THE EARTH LEAD SHOULD NOT BE
D SCONNECTED N ANY C RCUMSTANCE.
The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert the user to the presence
0f uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufficient magnitude to constitute a
risk of electric shock to persons.
The exclamation mark within an
equilateral triangle is intended to alert
the user of important operating and
maintenance (servicing) instructions in
the literature accompanying the
appliance.

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Instructions De Securite Importantes
Instructions De Securite ImportantesInstructions De Securite Importantes
Instructions De Securite Importantes
ATTENT ON: R SQUE DE CHOC ELECTR QUE.
NE PAS OUVR R
ATTENT ON: Appareils de construction de CLASSE doit être raccordé au réseau électrique via une prise de courant
reliée à la terre.
ATTENT ON: Pour éviter toute blessure, cet appareil doit être solidement fixé à la torture, conformément aux
instructions d'installation.
1.
Lisez ces consignes.
2. Conservez ces consignes.
3. Respectez tous les avertissements.
4. Respectez toutes les consignes d’utilisation.
5. N’utilisez jamais l’appareil à proximité d’un liquide.
6. Nettoyez l’appareil avec un chiff on sec.
7. Veillez à ne pas empêcher la bonne ventilation de
l’appareil via ses ouïes de ventilation. Respectez les
consignes du fabricant concernant l’installation de
l’appareil.
8. Ne placez pas l’appareil à proximité d’une source
de chaleur telle qu’un chauff age, une cuisinière ou
tout appareil dégageant de la chaleur (y compris un
ampli de puissance).
9. Ne supprimez jamais la sécurité des prises
bipolaires ou des prises terre. Les prises bipolaires
possèdent deux contacts de largeur diff érente. Le
plus large est le contact de sécurité. Les prises terre
possèdent deux contacts plus une mise à la terre
servant de sécurité. Si la prise du bloc d’alimentation
ou du cordon d’ali-mentation fourni ne correspond
pas à celles de votre installation électrique, faites
appel à un électricien pour eff ectuer le changement
de prise.
10. nstallez le cordon d’alimentation de telle façon
que personne ne puisse marcher dessus et qu’il soit
protégé d’arêtes coupantes. Assurez-vous que le
cordon d’alimentation est suffisamment protégé,
notamment au niveau de sa prise électrique et de
l’endroit où il est relié à l’appareil; cela est également
valable pour une éventuelle rallonge électrique.
11. Utilisez exclusivement des accessoires et des
appareils supplémentaires recommandés par le
fabricant.
12.
Utilisez exclusivement des chariots, des diables, des
présentoirs, des pieds et des surfaces de travail
recommandés par le fabricant ou livrés avec le produit.
Déplacez précautionneusement tout chariot ou diable
chargé pour éviter d’éventuelles blessures en cas de
chute.
13. Débranchez l’appareil de la tension secteur en cas
d’orage ou si l’appareil reste inutilisé pendant une
longue période de temps.
14. Les travaux d’entretien de l’appareil doivent être eff
ectués uniquement par du personnel qualifié. Aucun
entretien n’est nécessaire sauf si l’appareil est
endommagé de quelque façon que ce soit (dommages
sur le cordon d’alimentation ou la prise par exemple), si
un liquide ou un objet a pénétré à l’intérieur du châssis,
si l’appareil a été exposé à la pluie ou à l’humidité, s’il
ne fonctionne pas correctement ou à la suite d’une
chute.
15. N'exposez pas cet équipement au fait de tomber
goutte à goutte ou au fait d'éclabousser et garantissez
qu'aucun objet rempli des liquides, comme les vases,
n'est placé sur l'équipement.
16. Pour complètement débrancher cet équipement de
la conduite principale de courant alternatif, débranchez
la corde de pouvoir du disjoncteur de conduite
principale.
17. Cette unité est correspondue avec une corde de
pouvoir de 3 fils. Pour les raisons de sécurité, L'AVANCE
DE TERRE NE DEVRA T ÊTRE DÉBRANCHÉE DANS
AUCUNE C RCONSTANCE.
Le symbole repr
é
sentant un éclai
r fl
é
ch
é
dans un triangle équilatéral a pour but
d’alerter l’utilisateur de la présence
d’une “tension dangeruese” non isolée à
l’intérieur du boitier, pouvant être d’une
force suffisante pour constituer un risqué
d’électrocution.
Le point
d’exclamation dans un triangle
équilat é ral a pour but d’alerter
l’untilisateur de la présence
d’instructions importantes concernant le
fonctionnement et la maintenance, dans
la documentation qui accompagne
l’appariel.

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Declaration Of Conformity
Declaration Of ConformityDeclaration Of Conformity
Declaration Of Conformity
We, the manufacturer:
XTA Electronics Limited,
The Design House
Vale Business Par
Worcester Road
Stourport on Severn
Worcestershire
England
DY13 9BZ
acknowledge our responsibility that the following products:
Kind of equipment: Audio Amplifier
Commodity Code: 8518408990
Type Designation: APA-4E8
is manufactured:
in accordance with EMC Directive 2004/108/EC,
in compliance with the following norm(s) or document(s):
Technical Regulations: EN55103-1:1996, EN55103-2:1996
and
in accordance with the Low Voltage Directive 2006/95/EC,
in compliance with the following norm(s) or document(s):
Technical Regulations: EN/IEC60065:2002 7
th
Edition
Signed: ……………………………………………………………………
Name: Alex Cooper
Position: Research and Development Manager
Date: May 2015