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Commercial Audio
Metro 6.5" In-Ceiling 70V/100V Paging Speaker
User's Manual
P/M 36379
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SAFETY WARNINGS AND GUIDELINES
Please read this entire manual before using this device, paying extra attention to
these safety warnings and guidelines. Please keep this manual in a safe place for
future reference.
This speaker is intended for indoor use only. Do not expose this speaker
to water or moisture of any kind.
Turn off and unplug all equipment prior to making electrical connections,
including speaker wire connections.
Reduce the volume level prior to making any change to the audio input
source, e.g., changing radio stations or changing CDs.
When using this speaker as part of a constant voltage speaker system,
ensure that the amplifier power is at least 20% higher than the total
power settings of the connected speakers.
Most speaker damage is caused by clipping, which is heard as distortion.
If you hear distortion, reduce the volume level until the audio is no
longer distorted.
Take care to ensure that the speaker wire connections are properly
polarized. Inverted polarization can result in unnatural or attenuated
sound, especially in the bass frequencies.
Do not use chemical cleaners or solvents to clean this speaker. Use only
a soft, dry cloth. Moisten the cloth with warm water for particularly
stubborn deposits.
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INTRODUCTION
Thank you for purchasing this In-Ceiling Paging Speaker! This speaker features a
built-in step-down transformer, allowing it to be used as part of a 70V or 100V
constant voltage speaker array. It includes two 100V taps (6 and 10 watts) and
two 70V taps (3 and 6 watts). This commercial/industrial paging speaker is ideal
for vocal announcements and paging with the ability to play light background
music.
FEATURES
70V/100V constant voltage speaker
Two 100V taps (6 and 10 watts) and two 70V taps (3 and 6 watts)
Narrow edge design with aluminum grille
110 Hz ~ 15 kHz frequency response
Up to 101dB ±3dB sound pressure level
CUSTOMER SERVICE
The Monoprice Customer Service department is dedicated to ensuring that your
ordering, purchasing, and delivery experience is second to none. If you have any
problem with your order, please give us an opportunity to make it right. You can
contact a Monoprice Customer Service representative through the Live Chat link
on our website www.monoprice.com or via email at support@monoprice.com.
Check the website for support times and links.
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PACKAGE CONTENTS
Please take an inventory of the package contents to ensure you have all the
items listed below. If anything is missing or damaged, please contact Monoprice
Customer Service for a replacement.
1x Metro 6.5" In-Ceiling 70V/100V Paging Speaker
1x User's Manual
CONSTANT VOLTAGE VS 8-OHM SPEAKER
SYSTEMS
A constant voltage speaker system differs from a traditional 8-ohm speaker
system in that it uses a step-up transformer at the audio source to raise the
voltage and lower the current on the transmission line. At the speaker end, a
step-down transformer converts the signal back to a normal speaker level
voltage. This reduces power loss during transmission, which allows for the use of
longer speaker wire runs using smaller gauge wire.
Additionally, a constant voltage speaker system allows for the use of multiple
speakers on each channel, without the need for complicated impedance
calculations and configurations. In a constant voltage system, all speakers on a
given channel are connected in parallel and the complicated impedance
calculations are replaced by simple wattage calculations.
For example, if you want to connect two speakers per channel in a traditional 8-
ohm speaker system, you must either connect them in series, which results in an
overall 16-ohm impedance, or in parallel, which results in an overall 4-ohm
impedance. In the first case, the 16-ohms impedance effectively halves the
output power of your amplifier, resulting in lower overall volume levels. In the
latter case, the 4-ohms impedance means that your amplifier will have to work
harder and must be rated as stable at 4 ohms. Adding a third speaker to the mix
would complicate it further, producing either a 24-ohm or 2.67-ohm overall
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impedance. Note that very few amplifiers are stable under 2-ohm loads, so that is
usually not an option.
On the other hand, with a constant voltage system, you consider first the RMS
output wattage of the amplifier. This should be reduced by 20% to compensate
for insertion loss. For example, if using a 100-watt amplifier, the total load from
speakers should not exceed 80 watts.
Each individual speaker on a given channel is set to a value such that the total
does not exceed the rated power, less 20%. You do not need to worry about
making the total as close as possible to the limit; just ensure that the total does
not exceed the limit.
If all speakers are set to the same wattage value, they will all have the same
volume level. If one speaker is set to a higher wattage value, it will be louder
than the others, while a speaker set to a smaller value will be quieter than the
others. This allows you to compensate for the environment in which the speaker
is placed. For example, a speaker placed outside would need to be louder than a
speaker placed in a small room.
SPEAKER WIRING
Most constant voltage speaker installations will consist of
multiple speakers per channel, with all speakers
connected in parallel, as shown in the diagram to the
right.
To wire speakers in parallel, connect the first speaker to
the amplifier as normal. Connect the positive terminal on
the first speaker to the positive terminal of the second
speaker, and the negative terminal on the first speaker to
the negative terminal on the second. Repeat for each
additional speaker in the array.
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INSTALLATION
Perform the following steps to install and setup this speaker for operation. Do
not mix constant voltage and low impedance speakers in the same speaker array.
1. Power off and unplug all equipment that will be connected to this
speaker.
2. As part of a 70V or 100V constant voltage speaker array, select a tap to
one of the 70V or 100V wattage positions. The total wattage rating of all
speakers in the array must not exceed 80% of the amplifier's RMS power
rating.
Example: If you are using the 100V output of the 14886 120-watt constant voltage
amplifier, which has a maximum usable rating of 96 watts, you can connect up to
9 speakers using the 10-watt taps (90 total watts) or up to 16 speakers using the
6-watt taps (96 total watts).
3. Determine the mounting location of the speaker. Use a stud finder or
probe to ensure that the desired location in unobstructed.
4. Using a pencil, mark the cutout hole at the desired location.
5. Use a drywall saw or other tool appropriate for the ceiling material to
cut the mounting hole.
6. Run speaker wire from the amplifier to the speaker installation location.
Important Safety Warning! If installing this speaker in the ceiling, you must use
in-wall rated speaker wire for residential installations or plenum rated speaker
wire for commercial installations.
7. Connect the speaker wire to the speaker, taking care to ensure that
polarity is properly maintained.
8. Push the spring loaded metal tabs up towards the speaker magnet.
While holding the clips up, push the speaker into the hole, pulling your
fingers out of the hole as you insert the speaker and allowing the tabs to
come down and make contact with ceiling.
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TROUBLESHOOTING
Q1: The sound from one of the speakers is muddy, with attenuated bass
response.
A1: Double check the polarity of the speaker wire connections.
Q2: The sound from one of the speakers is louder or quieter than the other
speakers in a constant voltage system.
A2: Check the wattage settings of the affected speaker. If it is higher than that
of the other speakers, it will be louder. Similarly, if it is set to a lower value,
it will be quieter than the other speakers. To get the same volume level, set
the switch to the same wattage setting as is used on the other speakers.
Q3: The sound from all the speakers is scratchy, harsh, or fuzzy sounding.
A3: You are hearing audible distortion, which can cause damage to both the
speakers and the amplifier. Reduce the volume level until distortion can no
longer be heard in any part of the audio signal.
TECHNICAL SUPPORT
Monoprice is pleased to provide free, live, online technical support to assist you
with any questions you may have about installation, setup, troubleshooting, or
product recommendations. If you ever need assistance with your new product,
please come online to talk to one of our friendly and knowledgeable Tech
Support Associates. Technical support is available through the online chat button
on our website www.monoprice.com or through email by sending a message to
tech@monoprice.com. Check the website for support times and links.
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Model
36379
Driver Size
6.5"
Frequency Response
110 Hz ~ 15 kHz
Maximum Sound Pressure Level
101dB ±3dB
70V Taps
3 watts (red/white) and 6 watts
(red/blue)
100V Taps
6 watts (red/white) and 10 watts
(red/blue)
Maximum Wattage
10 watts
Operating Temperature
-13 ~ +131°F (-25 ~ +55°C)
Cutout Dimensions
ø6.69" (ø170mm)
Dimensions
ø7.5" x 2.8" (ø191 x 70 mm)
Weight
1.5 lbs. (0.68 kg)
SPECIFICATIONS
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