KB/A™ 30
KEYBOARD/ACOUSTIC AMPLIFIER
OPERATING GUIDE
R
Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
CAUTION: Risk of electrical shock — DO NOT OPEN!
CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer servicing to qualified service personnel.
WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before using this appliance, read the operating guide for further warnings.
Este símbolo tiene el propósito, de alertar al usuario de la presencia de “(voltaje) peligroso” que no tiene aislamiento dentro de la caja del producto que puede tener una magnitud suficiente como para constituir riesgo de corrientazo.
Este símbolo tiene el propósito de alertar al usario de la presencia de instruccones importantes sobre la operación y mantenimiento en la literatura que viene con el producto.
PRECAUCION: Riesgo de corrientazo — No abra.
PRECAUCION: Para disminuír el riesgo de corrientazo, no abra la cubierta. No hay piezas adentro que el usario pueda reparar. Deje todo mantenimiento a los técnicos calificados.
ADVERTENCIA: Para evitar corrientazos o peligro de incendio, no deje expuesto a la lluvia o humedad este aparato Antes de usar este aparato, Iea más advertencias en la guía de operación.
Ce symbole est utilisé pur indiquer à l’utilisateur la présence à l’intérieur de ce produit de tension nonisolée dangereuse pouvant être d’intensité suffisante pour constituer un risque de choc électrique.
Ce symbole est utilisé pour indiquer à l’utilisateur qu’il ou qu’elle trouvera d’importantes instructions sur l’utilisation et l’entretien (service) de l’appareil dans la littérature accompagnant le produit.
ATTENTION: Risques de choc électrique — NE PAS OUVRIR!
ATTENTION: Afin de réduire le risque de choc électrique, ne pas enlever le couvercle. Il ne se trouve à l’intérieur aucune pièce pouvant être reparée par l’utilisateur. Confier I’entretien à un personnel qualifié.
AVERTISSEMENT: Afin de prévenir les risques de décharge électrique ou de feu, n’exposez pas cet appareil à la pluie ou à l’humidité. Avant d’utiliser cet appareil, lisez les avertissements supplémentaires situés dans le guide.
Dieses Symbol soll den Anwender vor unisolierten gefährlichen Spannungen innerhalb des Gehäuses warnen, die von Ausreichender Stärke sind, um einen elektrischen Schlag verursachen zu können.
Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam machen, die Handhabung und Wartung des Produkts betreffen.
VORSICHT: Risiko — Elektrischer Schlag! Nicht öffnen!
VORSICHT: Um das Risiko eines elektrischen Schlages zu vermeiden, nicht die Abdeckung enfernen. Es befinden sich keine Teile darin, die vom Anwender repariert werden könnten. Reparaturen nur von qualifiziertem Fachpersonal durchführen lassen.
ACHTUNG: Um einen elektrischen Schlag oder Feuergefahr zu vermeiden, sollte dieses Gerät nicht dem Regen oder Feuchtigkeit ausgesetzt werden. Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.
2
ENGLISH
KB/A™ 30
Full-Range Biamped Combo
When you’ve got to have it all in a portable, high-powered, full-range amplifier — the KB/A™ 30 is it! This amp provides the perfect combination of size, power and features, and is the latest edition to
Peavey’s popular KB/A™ line of amplifiers.
MOBILITY
The KB/A 30 is compact enough to fit in the tightest locations and weighs only 34.3 pounds.
FULL RANGE SOUND
The KB/A 30 offers a special two-way coax speaker system featuring a 10" woofer with a 1" ferro fluid compression tweeter for exceptional full-range output. The coax design provides the advantages of a point source system, therefore when you move your head, the center point
doesn’t change. The dome tweeter provides a clean extended response that is extremely smooth.
The KB/A 30 cabinet, borrowed from our bass division, offers an isolated, sealed enclosure which provides optimum bass response.
BIAMPLIFICATION EXPONENTIALLY INCREASES OUTPUT
Unlike any other combo in its class, the KB/A 30 is biamped, which provides dedicated power amps to both the woofer and tweeter. Biamping greatly increases the sound output as the amplifiers work much more efficiently. The signal passes through a specially-designed electronic crossover which feeds the two amplifiers. A 40-watt amp powers the woofer, and a dedicated 10-watt amp powers the tweeter. Biamping greatly increases the available headroom and enables the KB/A 30 sound output to go beyond what you would expect.
FOUR INPUTS
Channel one is optimized for mic or line input (XLR combo input) and features two-band EQ. Channel two is optimized for line or acoustic inputs and features a gain switch to better handle acoustic inputs in addition to the two-band EQ. Channel three is a dedicated line/instrument input and features two-band EQ. A fourth channel is located on the rear panel and offers a monitor input. This signal passes only to the amp and is not part of the line output signal. This is handy for click tracks or other monitoring. You could even have the console monitor signal fed to the amp through this input giving the KB/A 30 a dual function. An effects insert (send/return) is also provided for adding your favorite EFX device to the master signal. The variety of inputs provided on the KB/A 30 make it a versatile power packed system.
OUTPUTS
The KB/A 30 offers an XLR balanced line output in addition to a 1/4" effects send jack that can function as a direct output. Also, the all-important headphone output is placed on the front for easy access. When the headphone is used, the amplifier signal is automatically muted.
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MORE...
This amp provides the perfect combination of size, power, and features. With excellent sound, roadworthy design, and unmatched reliability, the KB/A 30 is the amplification choice for your keyboard, acoustic guitar, and vocal applications.
And don’t forget ... with every KB/A series amplifier, you get Peavey’s excellent warranty and the best in support from its award-winning service department.
FRONT PANEL
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8
CHANNEL ONE
1.LOW-Z INPUT
For use with low-impedance microphones or low level sources equipped with a male XLR connector.
2.HIGH-Z INPUT
For use with high-impedance microphones or high level sources equipped with a 1/4" phone plug.
3.GAIN CONTROL
Controls the channel one input level.
4.LOW EQ
An active tone control (shelving type, ±15 dB) that varies the low-frequency range.
CAUTION: Excessive low-frequency boost causes greater power consumption and increases possibility of speaker damage.
5.HIGH EQ
An active tone control (shelving type, ±15 dB) that varies the high-frequency range.
CHANNEL TWO
6.HIGH-Z INPUT
A 1/4" phone jack input is provided with extremely wide dynamic range. This input will accept very high level signals generated by synthesized keyboard systems or very low signals generated by practice or home keyboard units.
4
7.LEVEL CONTROL
Controls the channel two 1/4" phone jack input level.
8.GAIN SWITCH
Boosts the gain of its channel by 12 dB. Depress to the “in” position to activate.
9.LOW EQ
An active tone control (shelving type, ±15 dB) that varies the low-frequency range. CAUTION: Excessive low frequency boost causes greater power consumption and increases possibility of speaker damage.
10.HIGH EQ
An active tone control (shelving type, ±15 dB) that varies the high-frequency range.
CHANNEL THREE
11.HIGH-Z INPUT
A 1/4" phone jack input is provided with extremely wide dynamic range. This input will accept very high level signals generated by synthesized keyboard systems or very low signals generated by practice or home keyboard units.
12.LEVEL CONTROL
Controls the channel three 1/4" phone jack input level.
13.LOW EQ
An active tone control (shelving type, ±15 dB) that varies the low-frequency range. CAUTION: Excessive low-frequency boost causes greater power consumption and increases possibility of speaker damage.
14.HIGH EQ
An active tone control (shelving type, ±15 dB) that varies the high-frequency range.
15.POWER LED (RED)
The red power LED will illuminate when AC power is being supplied to the amp.
16.HEADPHONE JACK
A stereo jack is provided in order to allow the signal to flow to each side of any stereo headset.
When a stereo headset is plugged in, the internal speaker is automatically turned off so that a totally private rehearsal situation can be accomplished. NOTE: The headphone system will not work with headsets that have a mono phone plug.
5
REAR PANEL
18 19
22
17.LINE OUT
Balanced XLR output can be used to route signals to a mixing console, tape recorded, etc.
18.EFFECTS PATCH
A stereo out/in jack allows the use of various auxiliary units (chorus, flanging, tape/digital/analog delays, equalizers, etc.) in line before the power amp section. To utilize this system, a stereo plug (tip/ring/sleeve) to a “Y” cord must be used. The tip portion of the 1/4" stereo jack serves as the signal send (output) while the ring portion will return the processed signal to the system. The sleeve portion serves as the ground.
Since this is a stereo jack configuration, the first click on the jack may be used as a pre power amp output with a mono 1/4" plug if desired. This first click will not disturb the signal flow to the remainder of the system as it is fed into the power amp section. NOTE: If the second click of the out/in jack is utilized without returning any signal to the system from an effects device the power amp will be disabled.
CHANNEL FOUR
19.MONITOR LEVEL
Controls the channel four 1/4" phone jack input level.
20.MONITOR INPUT
A 1/4" phone jack input is provided to be used as a monitor input. This signal does not route to the line output.
21.POWER SWITCH
Depress the switch to the “on” position. The red pilot light (LED) will illuminate indicating power is being supplied to the unit.
22.(120V PRODUCTS ONLY)
For your safety, we have incorporated a three-wire line (mains) cable with proper grounding facilities. It is not advisable to remove the ground pin under any circumstances. If it is necessary to use the equipment without proper grounding facilities, suitable grounding adapters should be used. Less noise and greatly reduced shock hazard exists when the unit is operated with the proper grounded receptacles.
6
KB/A™ 30 SPECIFICATIONS
PREAMP SECTION
The following preamp specs are measured at 1 kHz with the master EQ set flat at 0 dB, all gain switches in the out position, nominal signal levels are with channel level controls set at five. Minimum levels are with channel level controls set at 10.
CHANNEL ONE INPUTS
Low-Z Input Impedance: 5k ohms Nominal input Level: -30 dBV, 32 mV RMS Minimum input Level: -40 dBV, 10 mV RMS
High-Z Input Impedance: 5k ohms Nominal input level: -30 dBV, 32 mV RMS Minimum input level: -40 dBV, 10 mV RMS
CHANNEL TWO and CHANNEL THREE INPUTS
Input impedance: 22k ohms
Nominal input level: -21 dBV, 90 mV RMS Minimum input level: -40 dBV, 10 mV RMS
CHANNEL FOUR INPUT
Input impedance: 10k ohms Nominal input level: 0 dBV, 1 V RMS
Minimum input level: -25 dBV, 56 mV RMS
EFFECTS PATCH : (STEREO JACK TIP)
Function: Low level effects send Load impedance: 1k ohms or greater
Nominal output: -10 dBV, 316 mV RMS
PRE EQ PATCH: (STEREO JACK RING)
Function: Low level effects return Impedance: High-Z, 10k ohms Input level: -10 dBV, 316 mV RMS
(Switching stereo jack provides patch output to patch input connection when not used.)
LINE OUTPUT:
Function: High level signal send
Load impedance: 100 ohms or greater Nominal output: -6 dBV, 0.5V RMS Maximum output: 18 dBV, 8V RMS (XLR pin 2 positive/pin 3 negative)
HEADPHONE OUTPUT: (STEREO JACK)
Load impedance: 8 ohms or greater Nominal output: 100 mW
(Switching jack will disconnect internal speaker when headphone plug is inserted.)
The following specs measured at nominal setting, all phone jack inputs terminated with 47k ohms.
FREQUENCY RESPONSE
(Channel input/preamp output at 1 V RMS level) +0, -3 dB, 20 Hz to 20 kHz
PREAMP DISTORTION
(Channel in/preamp out, 20 Hz to 20 kHz at 1 V RMS)
Less than .05% THD, typically below .01%
PREAMP HUM AND NOISE
Greater than -95 dBV
CHANNEL EQUALIZATION
±15 dB at 80 Hz and 10 kHz, shelving
POWER AMPLIFIER SECTION
POWER AT CLIPPING (TYPICALLY)
40 W RMS into 8 ohms/low channel
10 W RMS into 8 ohms/high channel (Both channels driven, 5% THD, 3.5 kHz, 120 V AC Line)
TOTAL HARMONIC DISTORTION
Less than 0.3%, 30 W RMS/low channel into 8 ohms, 50 Hz to 2 kHz Less than 0.3%, 7 W RMS/high channel into 8 ohms, 5 kHz to 20 kHz (Typically below 0.2%)
FREQUENCY RESPONSE
+0,-1 dB, @ 30 W RMS/low channel into 8 ohms, 50 Hz to 2 kHz
+0,-1 dB, @ 7 W RMS/high channel into 8 ohms, 5 kHz to 20 kHz
HUM and NOISE
Greater than 90 dB below rated power
POWER CONSUMPTION (DOMESTIC)
100 W at 120 V AC, 50/60 Hz
CROSSOVER
Fixed, 18 dB/octave, 3.5 kHz crossover frequency
ALL SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
7
ESPAÑOL
KB/A™ 30
Biamplificador combinado de banda ancha
Si usted dispone de todo que necesita en un amplificador portátil de alta potencia y banda ancha, ¡tiene un biamplificador combinado KB/A™ 30! Este amplificador ofrece la combinación perfecta de tamaño, potencia y funciones. Además, es la última novedad en la renombrada línea de amplificadores KB/A™ de Peavey.
MOVILIDAD
El biamplificador combinado KB/A 30 es suficientemente compacto como ser instalado en los lugares más estrechos y sólo pesa 15,5 kg.
SONIDO DE BANDA ANCHA
El biamplificador combinado KB/A 30 ofrece un sistema especial de altavoces bidireccionales coaxiles con un altavoz de graves (woofer) de 10 pulg. y un altavoz de agudos (tweeter) de 1 pulg. con compresión y núcleo de fluido ferroso que permiten alcanzar una excepcional salida de banda ancha. El diseño coaxil ofrece las ventajas de un sistema de origen puntual por lo que, al girar la cabeza, el punto central no cambia de posición. El altavoz de agudos de forma convexa brinda un sonido de respuesta extendido y limpio que es extremadamente homogéneo.
El diseño del gabinete de este biamplificador combinado KB/A 30, diseñado por nuestra división de altavoces para graves, ofrece una caja acústica aislada y sellada que brinda una respuesta óptima de sonidos bajos.
LA BIAMPLIFICACIÓN AUMENTA EL VOLUMEN EN FORMA EXPONENCIAL
A diferencia de cualquier otro biamplificador combinado de su clase, el KB/A 30 es biamplificado, lo que le significa que cuenta con amplificadores de potencia dedicados, tanto para el altavoz de graves como para el de agudos. La biamplificación aumenta considerablemente el volumen del sonido debido a que el funcionamiento con dos amplificadores es mucho más eficiente. La señal pasa por un punto de entrecruzamiento electrónico de diseño especial que alimenta ambos amplificadores. El altavoz de graves recibe alimentación de un amplificador de 40 W y el altavoz de agudos de un amplificador dedicado de 10 W. La biamplificación multiplica la tolerancia de máximo nivel de señal disponible y permite que la salida de sonido del biamplificador combinado KB/A 30 exceda todas las expectativas.
CUATRO ENTRADAS
El canal uno está optimizado para una entrada de micrófono o de línea (entrada combinada XLR) y ofrece ecualización de dos bandas. El canal dos está optimizado para entradas de línea o señales acústicas y tiene un conmutador de ganancia que posibilita un mejor manejo de las señales acústicas, además de ofrecer ecualización de dos bandas. El canal tres es una entrada dedicada de línea o instrumento que también ofrece ecualización de dos bandas. El cuarto canal se encuentra en el panel posterior y ofrece una entrada para monitor. Esta señal pasa sólo al amplificador y no forma parte de la señal de salida de línea. Resulta de utilidad para seleccionar pistas o realizar otras operaciones de monitoreo. Asimismo, es posible hacer que la señal del monitor de la consola sea enviada al amplificador a través de esta entrada, para obtener una doble función del biamplificador combinado KB/A 30. También se ofrece una inserción de efectos (señal de muestra/retorno) para procesar la señal de control maestro con el dispositivo de efectos especiales que usted prefiera. La
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