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MOUNTING REQUIREMENTS
MUSICA volume control units are slightly taller, wider, and deeper than most volume
controls. Use of a low voltage mounting bracket or a 22.5 cu. in. E.O. box with a minimum
inside depth of 2.75” and a minimum inside height of 2.985” is recommended.
CALCULATING THE PROPER IMPEDANCE SETTINGS FOR THE SYSTEM
The MUSICA volume control is an impedance-matching stereo volume control that allows
multiple loudspeaker pairs and volume controls to be connected, in parallel, without the
additional cost of a separate impedance-matching device. For flexibility in system design, a
MUSICA volume control has three impedance matching capabilities: 2X, 4X, and 8X as well
as a 1X non-impedance matching setting that allows the unit to be used volume control.
To determine which setting should be used (1X, 2X, 4X, and 8X) you will need to know the
number of loudspeaker pairs, the loudspeaker impedance, and the load capability (output
impedance) of the amplifier. Most amplifiers will handle a load down to four or two ohms
with some going as low as 1 ohm.
Using the chart on page one; cross reference the number of loudspeaker pairs to the
amplifier impedance. Notice that the 4X jumper setting will allow twice as many loudspeaker
pairs.
EXAMPLE
If you have 8 pairs of 8 ohm loudspeakers and an amplifier capable of handling a 4 ohm
load you must set the volume control at the 4X setting for the amplifier to drive all 8 pairs of
speakers at full volume. Note that the 2X setting allows only 4 pairs of 8 ohm loudspeakers
to operate on a 4 ohm load. If however, you could select an amplifier with a 2 ohm output
impedance, the same 8 loudspeakers could operate on a 2 ohm load (at the 2X setting) or
16 loudspeaker pairs (at the 4X setting). Whenever possible, the lowest jumper setting for
a given amplifier should be selected.
IMPEDANCE JUMPER SETTINGS
@1X @2X @4X @8X
REQUIRED
AMPLIFIER
OUTPUT
IMPEDANCE
MAX. QTY. 8 OHM
LOUDSPEAKER PAIRS
JUMPER SETTING
MAX. QTY. 4 OHM
LOUDSPEAKER PAIRS
JUMPER SETTING
8 OHM
4 OHM
2 OHM
1 OHM
1 2 4 8
2 4 8 16
4 8 16 32
8 16 32 64
0 1 2 4
1 2 4 8
2 4 8 16
4 8 16 32
@1X @2X @4X @8X
CHANGING IMPEDANCE JUMPERS
Once the proper impedance setting is determined, locate the impedance jumpers (black
plastic modules) on the back side of the circuit board. One jumper is for the right channel,
the other for the left. Next, locate the 1X, 2X, 4X and 8X settings on the circuit board for
each channel. If the settings are correct, continue to the next step. If the settings need to
change, simply slide the jumper modules off and reinstall them on to the correct two pins.
LIMITATIONS
The MUSICA volume control limits the degree of impedance matching to eight times so
that music quality and overall performance is not sacrificed. We do not recommend that any
quality, multi-room music system be connected to a device which provides 16X impedance
matching as it may limit the amplifier’s power and system performance.
DESCRIPCIÓN GENERAL
El control de volumen MUSICA es un dispositivo de 8 ohmios con una placa decorativa de
pared. Este control permite reproducir música estéreo nítida y sin distorsiones cuando se
conectan uno o varios pares de altavoces a un solo amplificador.
La respuesta de frecuencias es de 20 Hz a 20 kHz (-3 dB, -0). La atenuación se logra en
once pasos, además de la posición de apagado positivo (OFF). Hay seis pasos de 3 dB
para lograr control de sintonización precisa a bajos niveles de audición; los siguientes tres
pasos son de 6 dB, luego viene un paso de 9 dB y, finalmente, un paso de 28 dB, antes de
la posición de apagado.
La perilla de control mide 1 1/4 de plg. de diámetro y sobresale sólo 11/16 de plg., lo cual
permite operarlo de manera discreta, pero funcional. Las unidades miden 2 11/16 de plg. de
profundidad y se pueden usar con un soporte de montaje de bajo voltaje o una caja E.O.
estándar de 22.5 pulgadas cúbicas (no suministrada). Cada control de volumen tiene piezas
plásticas correspondientes de color blanco. Estas piezas son la placa, la perilla y el ribete.
ESPECIFICACIONES
Procesamiento de potencia 50 Vatios
Impedancia 8 Ohmios
Respuesta de frecuencias 20 Hz a 20 kHz (-3 dB, -0)
Pérdida de inserción 0.5 dB
Tipo estéreo
Pasos 6 de 3 dB
3 de 6 dB
1 de 9 dB
1 de 28 dB
VISTA SUPERIOR
VISTA
LATERAL
32.6m
m
43.2m
m
105mm
68.5m
m
66mm
74mm