Musica MUSICAVC-50Z Installation Instructions Manual

1 9/32”

REQUIRED
AMPLIFIER

OUTPUT

IMPEDANCE

8 OHM
4 OHM
2 OHM
1 OHM

8 OHM STEREO VOLUME CONTROL

TOP VIEW

1 19/32”

SIDE VIEW

4 1/8”

2 19/32”

2 11/16”

IMPEDANCE JUMPER SETTINGS

MAX. QTY. 8 OHM

LOUDSPEAKER PAIRS

JUMPER SETTING

@1X @2X @4X @8X

1 2 4 8
2 4 8 16
4 8 16 32
8 16 32 64

2 15/16”

MAX. QTY. 4 OHM

LOUDSPEAKER PAIRS

JUMPER SETTING

@1X @2X @4X @8X

0 1 2 4
1 2 4 8
2 4 8 16
4 8 16 32

MUSICAVC-50Z

FEATURES

• Provides precision level control in 3dB increments (Lowest 6
Steps)

• 50 watt rating achieves clear, stereo music reproduction in 8 ohm
applications

• Impedance-Matching Capability of 2X, 4X and 8X provides ex-

ibility in system design

• Low prole styling is a favorite of architects and designers

• 1X Setting allows use as a standard 8 ohm non-impedance

matching volume control

• Decora-Style plate supplied in white, ivory, and almond

APPLICATION

Superior styling of the MUSICAVC-50Z volume control combined
with its ne tune level capability makes it ideal for residential/
custom installation and professional applications of all kinds in­cluding: private homes, medical and legal ofces, dental groups,
studios, and high-prole businesses that demand clear music re­production and precise level control.

GENERAL DESCRIPTION

The MUSICAVC-50Z volume control provides clear, distortion­free stereo music reproduction when one or multiple loudspeaker
pairs are powered by a single amplier. MUSICAVC-50Z is an 8
ohm device with a decora-style wall plate supplied in three colors
to match virtually any decor.

Frequency response is 20Hz - 20kHz (-3dB, -0). Attenuation is
accomplished in eleven steps plus positive off. The rst six steps
are 3dB for ne tune control at low listening levels, the next three
steps are 6dB, followed by one 9dB step and nally one 28dB step
before “off”.

The control knob measures 1 1/4” DIA. and projects a mere 11/
16” for unobtrusive yet functional operation. Assemblies measure
2 11/16” deep and mount into a standard 20 cu. in E.O. Box (by
others). Each volume control is supplied with matching plastic
parts in white, ivory, and almond. These parts include the plate,
knob, and trim piece. The volume control can be changed to the
color of your choice by changing out all three plastic parts.

INSTALLING

1) Pull off the plastic knob from the shaft.

2) Remove the trim piece by compressing the four tabs on the
back side of the metal plate.

3) Slide the hole in the desired color trim plate over the shaft and
press the four tabs into the back side of the metal plate.

4) Push the desired color knob onto the shaft, taking care to in­sure that the at in the knob lines up with the at on the shaft.

5) Install the desired color decora-style plate with the matching
nishing screws.

SPECIFICATIONS

Power Handling 50 Watts
Impedance 8 Ohms
Frequency Response 20Hz- 20kHz (-3dB, -0)
Insertion Loss .5dB
Type Stereo
Steps 6 @ 3dB
3 @ 6dB
1 @ 9dB
1 @ 28dB

INSTALLATION

L-

L+

R+

R-

L-

L+

R+

R-

INSTRUCTIONS

FOR

MUSICAVC-50Z

These diagrams show examples of a sys­tem that used 8 ohm loudspeakers and
an amplier capable of handling a 2 ohm
load.
Set each MUSICAVC-50Z volume control
impedance jumper according to the chart
on the front of this sheet.
The wiring depicts how volume controls
can be daisy chained or wired in home run
fashion from each volume control to the
amplier.

Stereo Amplier / Receiver

capable of handling a 2-ohm load

Connect additional volume controls if de­sired. Conrm maximum quantity by refer-

encing the impedance chart on front side.

*MEL* Main Equipment Location

Connector

Stereo Amplier / Receiver

capable of handling a 2-ohm load

Block

Connect additional volume controls if de­sired. Conrm maximum quantity by refer-

encing the impedance chart on front side.

Mounting Location:

Volume controls should be placed in acces­sible wall locations that are close to entry ways,
exits, light switches, or telephones. They may
also be ganged with other low voltage* controls
such as keypads or infrared repeaters.

*Note:

MUSICAVC-50Z should not be mounted into
the same electrical box used for a 110 volt de­vice even if the box says it is partitioned for this
purpose. Speaker wires may pick up electrical
noise which will be transmitted as a buzzing or
popping sound to the loudspeakers.

Mounting Requirements:

MUSICAVC-50Z units are slightly taller, wider,
and deeper than most volume controls and
requires a 20 cu. in. E.O. Box with a minimum
inside depth of 2.75” and a minimum inside
height of 2.985”. Recommended boxes for new
construction include: Carlon PVC switch box
#B-120A, and RACO PVC outlet box. For retro­t applications, CADDY drywall trim ring #MPLS
may be used.

Calculating the proper Impedance settings
for the system:

MUSICAVC-50Z 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
exibility in system design, MUSICAVC-50Z 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 amplier. Most ampliers 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 amplier
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 amplier capable of handling a 4 ohm load

1 Mitek Plaza/ Winslow, IL 61089/ 815-367-300/ 800-225-5689

you must set the volume control at the 4X
setting for the amplier 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 amplier 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 amplier should be selected.

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:

MUSICAVC-50Z limits the degree of imped­ance matching to eight times so that music
quality and overall performance is not sacri­ced. 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 amplier’s power and
system performance.

Pre wiring and Installation:

A) Mount the outlet box or plaster ring in

the wall (see mounting requirements). Each
room’s wiring can be individually run back to
the amplier (home run) or connected from
one room to the other (daisy chain). The
daisy chain wiring method connects one set
of speakers with volume control in parallel
to the next, using connection block or crimp
connectors in between. This method has the
advantage of requiring less wiring for the sys­tem rough-in, but allows for little or no system
upgrading for future applications.

With either method, be sure to mark the
cable connected to the amplier as (INPUT)
and write down the color codes you have
designated for the left channel, right channel,
positive, and negative leads.

www.MusicaAtHome.com

B) If using the “Home Run” wiring method,

each rooms speaker/volume control wiring
should be individually run back to the Main
Equipment Location “MEL” in a “Home Run”
fashion. Run a total of four conductors of
speaker cable from the amplier location to each
room’s volume control box.

Note:

Many building and re codes require cable to
be CL-2, CL-3, or FT4 rated. Check with your
local building inspector before pre wiring.

C) Next, run a two-conductor speaker cable
from the outlet box to the corresponding left
and right speakers. Mark each cable (LEFT)
and (RIGHT) and determine the polarity of each
channel (positive and negative).

D) Cut the cable accordingly, allowing enough
cable to hang outside the outlet box, to properly
connect the volume control. Tuck the cable back
into the outlet box to prevent damage during
drywall installation.

E) Tuck the excess cable from inside the outlet
box back out into the wall or fold wires carefully
while inserting the volume control into the outlet
box. Position the volume control so that the front
bracket lines up with the mounting holes on the
box. In some cases the MUSICAVC-50Z may be
a tight t requiring it to be inserted on the right
side of the outlet box and then slid left into the
center position.

Note:

In retrot applications, metal extension plates
and non-recommended outlet boxes may require
eld modication to accept the units’ higher and
deeper prole.

F) Secure unit with supplied screws. We rec­ommend loosening the screws 1/4 turn to allow
1/4” movement side-to-side and front-to-back.
This will allow the face plate to t ush when the
cover plate is installed.

G) Mount the cover plate and tighten the
screws.

21A7360-E

MUSICAVC-50Z

COMMANDE DE VOLUME STÉRÉO 8 OHMS

LA PREMIERE VUE

32.6mm

DE COTE VUE

104.8mm

65.9mm

68.3mm

CONFIGURATION DES CAVALIERS D’IMPÉDANCE

REQUIS

AMPLIFICATEUR

SORTIE

IMPÉDANCE

8 OHM
4 OHM
2 OHM
1 OHM

QTÉ MAX. 8 OHMS

PAIRES HAUT-PARLEURS

CONFIGURATION CAVALIERS

@1X @2X @4X @8X

1 2 4 8
2 4 8 16
4 8 16 32
8 16 32 64

40.5mm

74.6mm

QTÉ MAX. 4 OHMS

PAIRES HAUT-PARLEURS

CONFIGURATION CAVALIERS

@1X @2X @4X @8X

0 1 2 4
1 2 4 8
2 4 8 16
4 8 16 32

CARACTÉRISTIQUES

• Réglages précis par incréments de 3 dB (6 crans inférieurs)

• 50 watts de puissance nominale assurant une reproduction mu­sicale stéréo claire dans les applications 8 ohms

• Possibilité d’adaptation d’impédance 2X, 4X et 8X pour plus de
souplesse dans la conception de système

• Ligne compacte plébiscitée par les architectes et les concep­teurs

• Réglage 1X permettant l’utilisation comme commande de vo­lume standard 8 ohms sans adaptation d’impédance

• Plaque Decora-Style disponible en blanc, ivoire et amande

APPLICATION

La ligne supérieure de la commande de volume MUSICAVC­50Z, associée à la possibilité de réglage n qu’elle offre, en fait
l’accessoire polyvalent idéal pour les installations domestiques/
personnalisées et les applications professionnelles, entre autres :
maisons individuelles, cabinets médicaux, juridiques et dentaires,
studios et entreprises importantes exigeant une reproduction mu­sicale claire et une commande de volume précise.

DESCRIPTION GÉNÉRALE

La commande de volume MUSICAVC-50Z permet une repro­duction musicale stéréo claire et sans distorsion lorsqu’une ou
plusieurs paires de haut-parleurs sont alimentées par un même
amplicateur. MUSICAVC-50Z est un appareil 8 ohms muni d’une
plaque murale Decora-Style disponible en trois couleurs, s’assor­tissant à pratiquement tous les décors.

La plage de réponse en fréquence va de 20 Hz à 20 kHz (-3 dB,

-0). L’atténuation est accomplie suivant 11 crans plus un d’arrêt.
Les six premiers crans correspondent à 3 dB chacun pour le régla­ge n à faible volume, les trois suivants à 6 dB chacun, le suivant à
9 dB et enn le dernier à 28 dB avant la position d’arrêt.

Le bouton de commande au diamètre de 32 mm dépasse juste
de 18 mm, offrant ainsi un fonctionnement efcace mais discret.
L’ensemble mesure 68 mm de profondeur et se monte dans une
boîte E.O. 20 cu.in (33 centimètres cubes), non fournie. Chaque
commande de volume est accompagnée de pièces en plastique
assorties en blanc, ivoire et amande. Ces pièces comprennent
la plaque, le bouton et l’enjoliveur. Pour changer la couleur de la
commande de volume, il suft de remplacer ces trois pièces en
plastique par les pièces de la couleur voulue.

INSTALLATION

1) Retirez le bouton en plastique de l’axe.

2) Retirez l’enjoliveur en serrant les quatre languettes à l’arrière de
la plaque métallique.

3) Insérez l’enjoliveur de la couleur voulue sur l’axe et enfoncez les
quatre languettes dans la partie arrière de la plaque métallique.

4) Enfoncez le bouton de la couleur voulue sur l’axe en veillant à
ce que le méplat du bouton soit aligné avec celui de l’axe.

5) Installez la plaque Decora-Style de la couleur voulue à l’aide
des quatre vis assorties.

CARACTÉRISTIQUES TECHNIQUES

Puissance admissible 50 watts
Impédance 8 ohms
Réponse en fréquence 20 Hz à 20 kHz (-3 dB, -0)
Perte d’insertion 0,5 dB
Type Stéréo
Crans 6 de 3 dB
3 de 6 dB
1 de 9 dB

1 de 28 dB