Dynacord Xa 4000 User Manual
OWNER‘S MANUAL
BEDIENUNGSANLEITUNG
MODE D‘EMPLOI
TABLE DES MATIÈRES
IMPORTANT SAFETY INSTRUCTIONS ....................... 3
IMPORTANT SERVICE INSTRUCTIONS ....................... 3
DESCRIPTION ....................... 4
UNPACKING & WARRANTY ....................... 5
INSTALLATION NOTES ....................... 5
FRONT VIEW ....................... 6
REAR PANEL ....................... 7
INPUT ....................... 7
POWER AMP OUTPUT ....................... 8
GROUND-LIFT SWITCH ....................... 8
MAINS INPUT ....................... 8
MAINS OPERATION & RESULTING POWER AMP
TEMPERATURES ....................... 9
NOTES ON ADJUSTMENTS ....................... 10
GENERAL INSTALLATION NOTES ....................... 11
EXAMPLES FOR ACTIVE 2-WAY APPLICATIONS ....................... 12
SPECIFICATIONS / TECHNISCHE DATEN ....................... 42
BLOCK DIAGRAM ....................... 43
DIMENSIONS / ABMESSUNGEN ....................... 44
WICHTIGE SICHERHEITSHINWEISE ....................... 17
WICHTIGE SERVICEHINWEISE ....................... 17
BESCHREIBUNG ....................... 18
AUSPACKEN & GARANTIE ....................... 19
INSTALLATIONSHINWEISE ....................... 19
FRONTSEITE ....................... 20
RÜCKSEITE ....................... 21
INPUT ....................... 21
ENDSTUFENAUSGÄNGE ....................... 22
GROUND-LIFT SCHALTER ....................... 22
NETZEINGANG ....................... 22
NETZBETRIEB & WÄRMEENTWICKLUNG ....................... 23
EINSTELLHINWEISE ....................... 24
AUFBAUHINWEISE ....................... 25
BEISPIELE FÜR AKTIV 2-WEG ANLAGEN ....................... 26
SPECIFICATIONS / TECHNISCHE DATEN ....................... 42
BLOCK DIAGRAM ....................... 43
DIMENSIONS / ABMESSUNGEN ....................... 44
INSTRUCTIONS DE SÉCURITÉ IMPORTANTES ....................... 31
INSTRUCTIONS DE RÉPARATION IMPORTANTES ....................... 31
DESCRIPTION ....................... 32
DÉBALLAGE ET GARANTIE ....................... 33
REMARQUES CONCERNANT L‘INSTALLATION ....................... 33
FACE AVANT ....................... 34
ARRIÈRE ....................... 35
INPUT ....................... 35
NECTEURS DE SORTIE
DE L’AMPLIFICATEUR DE PUISSANCE ....................... 36
COMMUTATEUR GROUND-LIFT ....................... 36
ENTRÉE SECTEUR ....................... 36
FONCTIONNEMENT SUR LE SECTEUR
ET TEMPÉRATURES RÉSULTANTES ....................... 37
REMARQUES SUR LES RÉGLAGES ....................... 38
REMARQUES SUR L‘INSTALLATION ....................... 39
EXEMPLES D‘APPLICATIONS ACTIVES À 2 VOIES ....................... 40
CARACTÉRISTIQUES ET DONNÉES TECHNIQUES ....................... 42
SCHÉMA DE PRINCIPE ....................... 43
DIMENSIONS ....................... 44
CONTENTS
2
3
The lightning ash with arrowhead symbol, within an
equilateral triangle is intended to alert the user to the
presence of uninsulated „dangerous voltage“ within the
product’s enclosure that may be of sufcient magnitude
to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintance (servicing) instructions in the
literature accompanying the appliance.
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 manufactures instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including ampliers) 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. If the provided plug does not t into your outlet, consult an
electrican 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 specied by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged
in any way, such as 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.
14. Do not expose this equipment to dripping or splashing and ensure that no objects lled with liquids, such as vases,
are placed on the equipment.
15. To completely disconnect this equipment from the AC Mains, disconnect the power supply cord plug from the AC
receptacle.
16. The mains plug of the power supply cord shall remain readily operable.
CAUTION: These servicing instructions are for use by qualied personnel only. To reduce the risk of
electric shock, do not perform any servicing other than that ontained in the Operating
Instructions unless you are qualied to do so. Refer all servicing to qualied service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when
servicing the appliance.
2. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be
operated and is connected to the mains.
3. Switch off the power before retrotting any extensions, changing the mains voltage or the output voltage.
4. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure),
respectively between the mains poles has to be 3 mm and needs to be minded at all times. The minimum distance
between parts carrying mains voltage and any switches or breakers that are not connected to the mains (secondary
parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only
permissible when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the location where the appliance is being serviced have to be
strictly obeyed. This applies also to any regulations about the work place itself.
8. All instructions concerning the handling of MOS - circuits have to be observed.
SAFETY COMPONENT ( MUST BE REPLACED BY ORIGINAL PART )NOTE:
IMPORTANT SERVICE INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
Management of WEEE (waste electrical and electronic equipment) (applicable in Member States of the European
Union and other European countries with individual national policies on the management of WEEE) The symbol
on the product or on its packaging indicates that this product may not be treated as regular household waste, but
has to be disposed through returning it at a Telex dealer.
Félicitations ! En achetant un amplicateur de puissance Dynacord Xa4000 vous avez choisi un
appareil haut de gamme employant la technologie la plus avancée qui soit. L’amplicateur de puissance
à deux voies Xa 4000 d’emploi universel combine la technologie Classe-H à une alimentation à commutation.
Les amplicateurs de puissance Xa 4000 associent des performances audio inégalées, à un fonctionnement able et durable.
DESCRIPTION
Le XA4000 permet une installation et un fonctionnement facile des systèmes à deux voies, avec une
fréquence de séparation située à 140 Hz entre les enceintes basses et medium/aiguës.
La capacité de sortie de l’ampli de puissance, de 1100W/4ohms pour les basses et de 900W/4ohms
pour les medium/aigus, permet le branchement de quatre enceintes 8 ohms par voie. Le ltre séparateur
de fréquence intégré sépare les basses des medium/aigus à 140 Hz. Ce ltre de séparation est basé
sur un ltre Butterworth modié ayant une pente de 18dB/octave. La fréquence de séparation située à
140 Hz permet la connexion de pratiquement toutes les enceintes basses et medium/aiguës. L’usage
de systèmes de haut-parleurs 2 ou 3 voies large bande, par exemple les DYNACORD F150, comme
enceintes medium/aiguës est également possible. Bien sûr de tels systèmes ne pourront pas reproduire
les niveaux de pression élevés d’une enceinte medium/aiguë équipée d’une trompe, comme la FX12.
Des contrôles séparés gradués en dB pour les canaux SUB et TOP, sous forme de potentiomètres
crantés montés en retrait, ont une fourchette de contrôle allant de +6 dB à -∞, ce qui permet de combiner
les enceintes basses et medium/aiguës avec une réelle efcacité.
La réponse en fréquence du Xa 4000 est particulièrement adaptée aux applications “live”. Un ltre LoCut (coupe-bas) intégré atténue les signaux basse fréquence an d’éviter les grondements et bruits
subsoniques, et ainsi protéger les enceintes basses des surcharges mécaniques.
Optimisés pour l’usage avec des enceintes basses ouvertes de taille moyenne à grande, des hautparleurs à trompe basse, des trompes Manifold et guide d’onde Planar, les ltres LPN (Low Pass Notch,
ltres passe-bas éliminateur de bandes à pentes raide) équipant l’égalisation des basses corrigent la
réponse aux transitoires des enceintes basse connectées. Les sorties de puissance des amplis sont
équipées de connecteurs SPEAKON (femelle). L’assignation des broches du connecteur système est la
suivante : voie basse sur les broches 1+ et 1–, voie medium/aiguë sur les broches 2+ et 2–. L’usage de
câbles de haut-parleur à 4 brins permet une installation pratique, rapide et aisée; sans risque d’erreur
de câblage des haut-parleurs. Des prises SPEAKON, SUB et TOP, séparées sont fournies en plus du
connecteur SYSTEM. Le signal de sortie au niveau de ces connecteurs est présent sur les broches 1+
et 1–, ce qui permet le branchement aisé de pratiquement tout type de système de haut-parleurs, même
s’ils ne sont pas équipés de possibilités de câblage simplié.
La qualité de restitution du Xa 4000 est tout simplement superbe. Son alimentation secteur dérivée
de la gamme SWITCHMODE PRECISION et l’usage cohérent de la technologie Classe-H fournissent
une réserve importante allant bien au-delà de la puissance nominale mesurée en sortie, ainsi qu’une
réduction évidence de la perte de puissance. Les étages de puissance du XA4000 ont eux aussi
été conçu en employant la technologie Classe-H c’est-à-dire que cet ampli de puissance fournit une
commutation extrêmement rapide de la tension de fonctionnement en fonction du signal, ce qui a pour
effet de doubler la tension d’alimentation normale lorsque c’est nécessaire. Comparés à des amplis de
puissance de Classe-AB, les Classe-H génèrent, et de loin, beaucoup moins de perte de puissance
pour une sortie identique. Conséquence directe, cette perte de puissance ou dissipation réduite est
synonyme d’un échauffement moindre et donc d’un meilleur usage de l’énergie. Vous pouvez donc
installer vos amplis de puissance Classe-H dans des armoires de rack en laissant moins d’espace
entre les appareils. De plus, et tout en offrant une sortie identique, la consommation électrique est bien
moindre qu‘avec des amplis de Classe-AB.
Le Xa 4000 est protégé contre les surcharges thermiques et électriques, les courts-circuits et l’apparition
de composantes HF/DC aux sorties. Une protection contre la force électro-motrice (Back-EMF) élimine
le risque d’endommager les transistors de sortie par un retour de l’énergie électrique. Les sorties de
puissance sont commutées via relais avec une temporisation lors du démarrage, et un limiteur de
courant évite que les fusibles ne sautent de façon intempestive.
4
Sa construction mécanique et artisanale satisfait aux standards de fabrication de haute précision. Son
châssis robuste est extrêmement rigide. Deux ventilateurs très performants à trois allures (off/slow/fast)
garantissent une stabilité thermique totale avec un bruit très faible. La ventilation est dirigée de l’avant
vers l’arrière ce qui permet un fonctionnement sans problème, même dans les armoires de racks les
plus exiguës. L’entrée, symétrisée électroniquement s’effectue sur des embases XLR. Une sortie directe (Direct Out) pour le transit du signal audio s’effectue via des embases de type XLRM. Un afchage à
LED très lisible donne un aperçu rapide de l’état de fonctionnement de l’ampli de puissance. Ce mode
d‘emploi décrit et explique les diverses fonctions de votre amplicateur de puissance Xa 4000. Veuillez
le lire attentivement dans son ensemble et respecter les instructions mentionnées.
DÉBALLAGE ET GARANTIE
Ouvrez avec précautions l’emballage et sortez l’amplicateur de puissance. En plus de l’amplicateur
de puissance lui-même, l’emballage contient également le présent mode d’emploi, un cordon secteur
ainsi que le certicat de garantie. Conservez en lieu sûr l’original de la facture, qui doit mentionner la
date d’achat et de livraison ainsi que le certicat de garantie.
REMARQUES CONCERNANT L’INSTALLATION
Généralement, l’installation ou le montage en rack des amplis de puissance doit être effectué de manière
à assurer une circulation constante de l’air de l’avant vers l’arrière. L’installation d’appareils ayant une
circulation d’air contraire dans une même armoire fermée n’est pas recommandée. Si plusieurs appareils
sont installés dans une armoire fermée veillez à ce qu’il y ait une ventilation sufsante. Laissez un
espace d’au moins 60mm x 330mm (au-dessus des ouîes de ventilation) pour permettre la circulation
de l’air entre l’arrière de l’amplicateur de puissance et le fond de l’armoire. Veillez à laisser au moins
100 mm d’espace libre au-dessus de l’armoire ou du rack. Comme les températures à l’intérieur de
l’armoire peuvent facilement atteindre les 40°C en fonctionnement, n’oubliez pas que la température
ambiante maximale doit aussi pouvoir être supportée par tous les autres appareils installés dans cette
armoire (reportez-vous également au § “FONCTIONNEMENT SUR LE SECTEUR ET TEMPÉRATURE
RÉSULTANTE”).
Attention: Pour assurer un fonctionnement sans problème et en toute sécurité, ne pas faire
fonctionner l’amplicateur de puissance au-delà d’une température de +40°C.
Pour éviter toute déformation de la face avant, l’usage de rails d’installation ou de glissières, disponibles
en option, est obligatoire pour installer l’appareil dans une armoire de rack.
L’amplicateur de puissance doit être protégé contre : d’éventuels éclaboussures ou fuites de liquides,
les rayons directs du soleil, les températures élevées ou l’inuence directe de sources de chaleur, une
humidité élevée, trop de poussières et de vibrations.
S’il n’est pas possible de garantir à long terme ces conditions, une maintenance régulière est absolument
obligatoire pour éviter une possible panne de l’amplicateur de puissance, due principalement aux
effets néfastes de son environnement.
De la condensation peut se former sur les éléments internes lorsque l’amplicateur de puissance est
transporté d’un endroit froid à un endroit chaud. Dans ce cas, il faut attendre que l’appareil se soit
adapté à la nouvelle température pour le faire fonctionner (après approximativement une heure). Si des
corps étrangers ou du liquide ont pénétrés dans le châssis de l’amplicateur de puissance débranchezle immédiatement du secteur et contactez un service technique agréé qui procédera à une inspection
avant de le remettre en marche.
DESCRIPTION
5
FRONT PANEL
This indicator lights when the power amplier has been switched on. Causes for the
POWER-indicator not lighting are: the appliance is not connected to the mains
network or a defective primary fuse
The PROTECT LED lights indicating that one of the internal protection circuits
against thermal overload, short-circuit, Back-EMF, HF-occurrence at the output,
etc., has been activated. The output relays interrupt the connected load from the
power amps while input signals are interrupted as well, preventing the connected
loudspeaker systems and the power amplier itself from being damaged.
Whatever caused the fault – e.g. a short-circuited speaker cable – needs to be
remedied. In case of thermal overload you have to wait until the power amplier
automatically regains normal operation.
The SIGNAL LED lights as soon as an audio signal of approximately 30dB below full
modulation is present at the output. The LED is dimmed when speaker cables are
short-circuited or a protection circuit has been activated
The 0dB LED lights whenever the power amplier is driven at its limits. Higher input
voltage does not result in higher peak output voltage. In addition, the 0dB indicator
comes in handy when adjusting external limiters.
This indicator lights as soon as one of the integrated dynamic audio signal limiters is
being activated and the power amplier is driven at the clipping limit or generally at its
maximum capacity. Short-term blinking is not a problem, because the internal limiter
trims input levels of up to +21dBu down to a S/N-ratio of approximately 1%. If, on the
other hand, this LED lights constantly, reducing the volume is recommended to prevent
the loudspeaker systems connected from being damaged by probable overload.
Detent potentiometers scaled in dB for adjusting amplication
levels of SUB and TOP channels. To prevent distortion in
mixing consoles connected to the amp, setting these controls
to a value between 0dB and +6dB is generally recommended.
The dB-scale provides direct indication of the control
attenuation applied to the xed internal amplication.
Use the POWER switch located on the front panel to power-on the appliance. The soft-start function
protects against current inrush peaks on the mains, which in addition prevents the mains line protection
switch from activating during power-on. The loudspeaker outputs are activated via relay switching with
a delay of approximately 3 seconds to efciently attenuate eventual power-on noise. The PROTECT
LED lights during the delay time and the fans run at maximum speed. This is normal, conrming the
protection circuitry’s immaculate operation.
6
INPUT
The electronically balanced INPUT offers an input sensitivity
of 0dBu (775mV) for direct connection of mixing consoles,
equalizers, etc.
The XLR-type connector OUTPUT is prepared for “through connecting” input signals to additional external power amps.
The input signal is directly routed to the output connector.
There are no repeaters or other electronic components within
that signal path. Accordingly, input and output connectors
are directly interconnected in parallel, offering permanent
electrical connection, without regard to the setting of the
Power-ON switch.
NF-CONNECTION CORDS
Choosing high-quality balanced cables (two conductors for the audio signal plus separate shielding mesh) with XLR-type connectors is recommended for LF-signal connection. Although connecting
unbalanced cables to the power amplier inputs is possible as well, using balanced cables is always
preferable. A great number of today’s audio appliances employ balanced outputs. With balanced cabling, the shield connects all metal enclosure parts and therefore efciently eliminates the introduction
of external interference – mostly noise and hum.
XLR-type connector pin-assignment
XLR (male) XLR (female)
REAR PANEL
7
REAR PANEL
Power amp output connection for SYSTEM, SUB and
TOP channels is provided via professional SPEAKONtype output connectors. This mechanically and
electrically safe connection method complies with any
safety standard allowing the use of high-performance
loudspeaker cables with diameters of up to 4 x 2.5mm2.
The DYNACORD accessory program offers single
connectors and couplings as well as high-performance
loudspeaker cables.
The four poles of the system connector are assigned
as follows: the low-frequency signal is present via
pins 1+ and 1- while pins 2+ and 2- carry the Mid/
Hi-range audio signal. Using four-pole SPEAKON
speaker cables allows quick, trouble-free and correct
connection of loudspeaker cabinets that provide
system connectors – like FX 12 and FX 20.
A plastic lid covers SUB and TOP connectors to
prevent inadvertent erroneous connection. Remove
these covers only in the event that you are going to
connect speaker systems that do not provide system
connectors. Keep in mind that the bass and mid/hi
audio signals are present on the SUB and TOP
connectors’ pins 1+ and 1-.
POWER AMPLIFIER OUTPUT CONNECTORS
Caution:
The FLASH symbol “ ” at the loudspeaker connectors indicates that high voltages are present at
these connectors which, when getting in contact, can cause harm to someone’s health.
The ground-lift switch allows eliminating noise loops. When operating
the power amplier in a 19” rack-shelf system or cabinet together
with other equipment, setting the switch to its GROUNDED position is
recommended. When operating the power amplier together with
appliances with differing ground potentials, set the switch to its
UNGROUNDED position.
Under normal circumstances, the mains fuse only blows in case of
fault. Replacing the fuse is only permissible for authorized service
personnel using a new fuse of the same type with identical amperage,
voltage and blow characteristics. The high-performance mains cord
supplied with your power amplier complies with applicable
safety regulations, plus that its diameter corresponds to the power
amp’s power output capacity. Whenever possible make sure to use the
supplied mains cord for connecting the power amp to the mains
network. Using a different mains cord with a smaller diameter results
in higher leakage, consequently reducing the amplier’s maximum
power output capacity.
GROUND-LIFT SWITCH
MAINS INPUT
8
MAINS OPERATION & RESULTING POWER AMP TEMPERATURES
The following tables are useful in determining power supply and cabling requirements.
The power drawn from the mains network is converted into acoustic output to feed the connected
loudspeaker systems plus heat. The difference between drawn power and dispensed power is referred
to as leakage power or dissipation (Pd). The amount of heat resulting from power dissipation might
remain inside of a rack-shelf and needs to be diverted using appropriate measures. The following table
is meant as auxiliary means for calculating temperatures inside of rack-shelf systems/cabinets and the
ventilation efforts necessary.
The column “Pd” lists the leakage power in relation to different operational states. The column “BTU/
hr” shows the dispensed heat amount per hour.
MAINS OPERATION & RESULTING TEMPERATURES
Xa 4000
U
mains
[V]
I
mains
[A]
P
mains
[W]
P
out
SUB+TOP
[W]
Pd
(5)
[W]
BTU/hr
(1)
idle 230V 1 80 - 80 273
Max. Output Power @ 8Ω
(1)
230V 10,6 1640 600+500 540 1840
Max. Output Power @ 4Ω
(1)
230V 18,2 3000 1100+900 1000 3410
1/3 Max. Output Power @ 4Ω
(1)
230V 10,3 1580 366+300 914 3120
1/8 Max. Output Power @ 4Ω
(1)
230V 4,5 610 137+113 360 1230
1/8 Max. Output Power @ 4Ω
(2)
230V 5,5 790 137+113 540 1840
1/8 Max. Output Power @ 4Ω
(2), (4)
254V 5,5 840 166+137 537 1830
Normal Mode (-10dB) @ 4Ω
(1)
230V 4,1 550 110+90 350 1190
Rated Output Power (0dB) @ 4Ω
(1)
230V 17,2 2800 1000+800 1000 3410
Alert (Alarm) Mode (-3dB) @ 4Ω
(1)
230V 12,3 1920 500+400 1020 3480
1/3 Max. Output Power @ 2Ω
(2)
230V 16,7 2720 600+533 1587 5420
1/8 Max. Output Power @ 2Ω
(1)
230V 7,2 1050 225+200 625 2130
1/8 Max. Output Power @ 2Ω
(2)
230V 8,8 1260 225+200 835 2850
(1)
Sine Signal Modulation (80Hz/1kHz)
(2)
Band-limited Pink Noise
(3)
1BTU = 1055.06J = 1055.06Ws
(4)
10% Mains Over Voltage
(5)
Pd = Leakage Power
The following factors allow direct proportional calculation of the power consumption for different mains
supply voltages:
100V = 2.3; 120V = 1.9; 220V = 1.05; 240V = 0.96
9
NOTES ON ADJUSTMENTS
1. Turn the EQ controls on the mixing desk to a central position (linear setting).
2. Switch any third-octave or octave equalisers to “Bypass” or set the equaliser controls to a
central position.
3. Connect a microphone and use the SUB and TOP control of the power amplier to set the
signal in such a way that the human voice sounds “natural”.
4. This concludes the basic system setup.
5. Using the EQ controls, a wide variety of microphone and instrument inputs can now be
adjusted on the mixing desk to match personal preference.
EQUALISER
Third-octave or octave equalisers should be set very carefully, if at all. With many third-octave or octave equalisers, even slight alterations in Lo or Mid range lead to unacceptable sound falsications
which cannot be eliminated via other EQ controls.
ADJUSTMENTS WITH REAL TIME ANALYSER AND EQUALIZER
“Fine tuning” of amplier and loudspeaker systems with real time analysers and third-octave or octave
equalisers is not normally advisable. Depending on the setting in question, third-octave equalisers in
particular cause phase and group time distortions which falsify the sound considerably. The measuring
microphone evaluates both the cabinet direct sound eld and the reections simultaneously, thus preventing any proper interpretation of the readings from a sound point of view.
If particularly unfavourable acoustic conditions make ne tuning seem necessary, the following principles should be adhered to when tuning amplier and speaker systems:
1. Only measure in the direct speaker sound eld, normally at a distance of 3 - 5 metres
maximum. If the measuring microphone is set up further away, (e.g. in the middle of the
hall), both direct and room sound is measured. Any attempt to linearize this “blend” with EQ
normally produces an extremely mid-, tinny- sounding, obtrusive sound image.
2. When measuring in the “critical” range between ca. 250 Hz - 5 kHz, only cut with the EQ - do
not boost on any account! A “gap” in the spectrum is not considered so obtrusive as a “hump”.
It is essential to avoid substantial increases in the bass range as this would drastically impair
the transient response of the entire system.
3. When measuring, only work with 5 W maximum capacity (pink noise). This prevents
amplier clipping and related distortions. With conventional noise generators the peak value of
the noise voltage is approximately 10 dB higher than the RMS value, meaning that even 5 W
amplied power can lead to short-term peaks of up to 50 W.
4. Dominant acoustic feedback can sometimes be suppressed somewhat by third-octave
equalisers or parametric EQ’s. In applications of this nature, great care should be taken to
ensure that the gain in volume does not mean reduced clarity and naturalness.
NOTES ON ADJUSTMENTS
10
GENERAL INSTALLATION NOTES
• When installing a sound reinforcement system for halls or festival tents over
their entire length, the loudspeaker systems have to be set up on the left
and right sides of the stage, slightly pointing to the center, resulting in a beamshape coverage pattern over the length of the hall or festival tent. Placing
Mid/Hi cabinets on both sides on top of each other (“STACKING”) provides
improved long-throw coverage. Stacking the loudspeaker systems in this way
almost doubles coverage while at the same time near eld reproduction is not
too loud.
• When installing a sound reinforcement system for halls or festival tents on
the wider wall side, the loudspeaker systems have to be set up on the left
and right sides of the stage, aimed towards the audience. Because of the
wider horizontal dispersion angle needed (“covering the front and the sides”),
this kind of sound reinforcement application can only be satisfactory realized
when employing two Mid/Hi cabinets per side. Exceptionally preferable for
these applications is the “stack and splay” technique - turning the two MID-HI
cabinets, which are placed on top of each other – which results in smoother
sound reproduction over the entire audience area.
• In many halls and festival tents low-frequency response can be dramatically
improved by placing the woofer systems directly on the oor instead of on
the stage. In return this requires installing the Mid/Hi cabinets on loudspeaker
pole-stands.
• Arraying woofer systems in a center “cluster” results in extreme lowfrequency SPL in the proximity of the “woofer cluster” with SPL dropping
rapidly over distance.
• Compared to woofer-cluster-conguration, de-centralized placing the woofer
systems on the oor along the edge of the stage results in reduced lowfrequency SPL in the audience area next to the stage. De-centralized placing
on the oor along the edge of the stage on the other hand provides
considerably improved low-frequency response over wider distances.
GENERAL INSTALLATION NOTES
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Fig. 1 shows a standard setup consisting of 2x Xa 4000, 2x FX12 used as Mid/Hi cabinets and 4x FX 20 used
as woofer cabinets. This all-purpose setup fullls the requirements of most applications. The use of four FX
20 bass cabinets produces solid low-frequency sound reproduction, which is most favorable for revival and
jazz-rock bands as well as for other bass drum-oriented musical styles when performed in medium size clubs
or festival tents.
Sound reinforcement of side areas can be realized through employing additional „sidell” speaker systems,
like for example compact 2- or 3-way fullrange cabinets, which are simply connected via the TOP-Speakon
socket of the Xa 4000. This connector carries the Mid/Hi audio signal via pins 1+/1-.
EXAMPLES FOR ACTIVE 2-WAY APPLICATIONS
Fig. 2 shows a variation of the standard setup that is advantageous for wider stages. Whenever placing the
loudspeaker cabinets on stage is possible, in most cases the use of a single FX 20 woofer to elevate the FX
12 Mid/Hi cabinet in the correct height on top of the woofer is sufcient. The remaining two woofer cabinets
are congured as center cluster in the middle and in front of or under the stage providing homogeneous
coverage of the audience area. In addition to that extra degree of homogeneous coverage this left-centerright setup allows achieving higher SPL in the low-frequency range.
Fig. 1
Fig. 2
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Fig. 3 shows the possibility of how to achieve even higher SPL through employing an additional FX 20 woofer
and Mid/Hi cabinets on each side of the stage. Additional cabinets are simply connected in parallel to the
existing speaker systems. Of course, conguring woofers in a left-center-right setup – as outlines in Fig. 2 – is
possible without problem. Stacking the Mid/Hi cabinets on top of each other almost doubles coverage, without
the drawback of too high acoustic output in the proximity of the stage. Using the “stack & splay” technique
– turning the stacked Mid/Hi cabinets so that they aim at slightly different angles – even improves coverage of
the audience area.
Fig. 3
Fig. 4 shows a setup consisting of a complete Xa standard installation per side, which is especially suitable
for major clubs and large festival tents up to a size of approximately 3000 sqm. If needed, this conguration
allows expanding each Xa system through adding additional loudspeaker cabinets (please refer to Fig. 3).
The left-center-right setup delivers noticeably more SPL in the low-frequency range and most of all provides
truly homogeneous dispersion and coverage in the audience area, without the annoyance of interference. This
conguration is particularly recommendable for wide stages.
Fig. 4
EXAMPLES FOR ACTIVE 2-WAY APPLICATIONS
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BEDIENUNGSANLEITUNG
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