AVSL AUDIO MANAGEMENT SPEAKER SELECTOR User Manual

Owner’s Manual

128.303

Dual Source 4-Zone Automatic Impedance Matching Speaker
Selector With Volume Control

1. Description

The 128.303 are switchable dual source speaker selectors with
individual volume control for up to 4 different zones.
With the switchable function, users can alternate between the two
different amplifiers or receivers in each zone. This allows users to enjoy
Source A in one room and Source B in another room.

2. Installation Consideration

The 128.303 are designed for use with a receiver
or amplifier with a maximum power of 180 Watts per channel at
8 ohms respectively. If you are uncertain about the power rating
of your receiver or amplifier, consult the appliance’s manufacturer.

recommend using only 8 ohm speakers when using the

128.303. Furthermore, does not recommend
installing more than 1 pair of speakers per pair of channels. Each pair
of channels or terminal block is designed for 1 pair of speakers using
up to 14 gauge wire.

Speaker wires can act as an antenna for electrical noise. Locating
speaker wires too close to a light dimmer or switches may cause a
buzzing or popping sound to be heard through the speakers. If you must
locate the 128.303 wiring near electrical devices, route the speaker wires
several inches away .

3. Operation

It is important to properly adjust an impedance-matching system to
avoid distortion or DC clipping (DC voltage will produced from an
amplifier that is overworked or that has an improper load). These can
cause the amplifier to go into protection , and can cause the

128.303 to heat up, damaging the system components. To set up the
system , the amplifier volume should be at its lowest volume
setting, and the selector volume control should be the highest setting.
Slowly adjust the amplifier volume to a level that is acceptable
without clipping.

5. Installation

- Insert each wire into the appropriate hole on the removeable terminals.

- Strip ¼” of insulation from the end of each wire. Tightly twist the end of
each wire until no frayed ends remain. Use a small screwdriver to tighten

wire in place.

each

- Insert the connector plug into the socket and lock in place by tightening
captive screws on each side of the connector (See Figure 1). The inputs of

128.303 are the connecting terminals for the amplifers . Be sure not reverse
these connections or the 128.303 will not function properly.

- Each zone gets connected to a pair of speakers. Make sure you connect
negative (-) to negative (-) and positive (+) to positive (+).

Figure 1: Wiring Diagram

Amplifier/Receiver A

Zone 1

Speaker (Left)

Speaker (Right)

Amplifier/Receiver B

128.303

4. Operation

minimum.

- Set the volume control for the speaker pair you wish to play to maximum
(Fully clockwise)

play. Set it to the ON position.

on the 128.303

Audio Power Handling:

Frequency Response:

Input Source:

Wiring requirement:

Speaker impedance:

Unit Dimensions:

100 Watts/Channel peak

20Hz - 20kHz

Up to 14 gauge wire

8 ohm

430W x 158D x 64H mm