Monoprice 21645, 21643 User Manual
Weatherproof 70V/100V 2-way Speakers
P/Ns 21643 / 21645
User's Manual
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.
These speakers are weatherproof with an IPx4 Ingress Protection rating, which
means that they can withstand dripping or splashing water for 10 minutes.
Although they are protected against splashing water for a short period of time,
these speakers should be installed in a covered location. Additionally, they should
not be allowed to sit in standing water.
These speakers are only weatherproof when mounted in a vertical orientation, with
the tweeter at the top, or horizontally with the tweeter on the left.
The speaker terminals on the rear of the speakers are weather resistant, not
weather proof. Take care to avoid exposing them to water.
Power off and unplug all Audio/Video components when making wired
connections. Only apply power after all connections have been made.
Double-check all connections prior to applying power to ensure that speaker
polarity is properly made and that there are no stray wire strands, which could short
the connections, either on the back of the speakers or the AV receiver/amplifier.
Do not use full volume until after the speakers have been fully broken-in.
If you hear distortion reduce the volume until the distortion is no longer audible.
Distortion can sound like a buzzing, scratching, or hammering sound. Distortion can
damage or destroy the delicate speaker coils.
Do not use cleaning fluids, solvents, or other chemicals to clean the speaker
cabinets.
Do not use excessive volume when listening to this speaker system. If you
experience pain, discomfort, or dizziness, reduce volume immediately. Prolonged
exposure to excessive volume can cause permanent hearing damage.
Do not disassemble or attempt to service these speakers.
If installing speaker wire inside or through walls, you must use in-wall rated speaker
wire.
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INTRODUCTION
Thank you for purchasing these Weatherproof 70V/100V 2-way Speakers!
These speakers feature a weatherproof enclosure, which is capable of withstanding the
splashing water jets for several minutes, making them well-suited to outdoor installations.
FEATURES
Weatherproof plastic housing
IPx4 ingress protection rating
Includes wall mounting brackets
8 ohms nominal impedance
70V and 100V constant voltage taps
Weather resistant push terminals
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 during normal business hours (Mon-Fri: 5am-7pm PT, Sat-Sun: 9am-
6pm PT) or via email at support@monoprice.com
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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.
2x Weatherproof 70V/100V 2-way speakers
2x Wall mounting brackets
4x M4x40 mounting screws (6.5-inch model only)
6x M3.5x15 mounting screws (6.5-inch model only)
8x M4x25 mounting screws (4-inch model only)
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
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