Audioplex AT-12 Installatiehandleiding - Pagina 2

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Observing the same precautions, connect the speaker wires to the appropriate AT-12 terminals marked "OUTPUT TO

SPEAKERS".

If connecting several pairs of speakers in a "zone" configuration, best results will be obtained with all of them connected

in parallel. Series arrangements can be used, but usually with some sacrifice in sound quality--the evils of each speaker in the

series chain are usually visited on the other.

If the AT-12 is to be installed free-standing or rack mounted, no special precautions are required because no significant

amount of heat is generated in normal operation. Because of this fact, the AT-12 is also safe for in-wall installation.

The AT-12 chassis is 3 1/4" deep from the front panel to the chassis rear. This will fit in any standard 2X4 studded wall

with approximately 1/2" clearance for wiring. The in-wall cut-out should be 4 11/16" high by 13 1/2" wide (minimum). The

long cut must be made carefully, there is slightly less than 1/4" overhang at the top and bottom of the panel. The in-wall

panel is designed to fit 16" centered studs. The mounting holes are spaced at 16" and are 5/32" in diameter to clear #6 size

screws.

To ease final installation, it is suggested that the wires be pre-connected to the removable connectors, and dressed in the

order of connection to avoid crossovers as much as possible because of the limited rear space. An additional suggestion is to

form the wires as close as possible to the way they will be when the installation is complete. The large number of wires

involved may make the assembly rather stiff and performing will reduce strain on the connectors during final installation.

Complete the installation by mating the connectors to the AT-12 chassis and gently moving into position in the cut-out.

Secure with whatever fasteners you will be using into the 2X4 studs.

The rotary IMPEDANCE MATCH-ATTENUATION switch is used to make connection to the appropriate impedance

matching tap on the AT-12 transformers. The front panel markings show the attenuation of level for each position. As the

attenuation is increased (CCW), the number of speakers that can be operated simultaneously also increases.

Matching impedance for each switch setting follow: (for a 4 Ohm load to appear on the amplifier output). The first

number indicates the level drop in decibels, as marked on the front panel.

No transfer, 1-4 or 2-8 Ohm speakers.

-3

Load X2, 2-4 or 4-8 Ohm speakers.

-6

Load X4, 4-4 or 8-8 Ohm speakers.

-8

Load X6, 6-4 or 12-8 Ohm speakers.

-10 Load X9, 9-4 or 18-8 Ohm speakers.

-11 Load X12, 12-4 or 24-8 Ohm speakers.

Combinations of speaker impedances can be mixed, the resulting load will fall somewhere in between those shown on the

chart.

Good practice would be to set the matching control for the worst case (maximum number of speakers) and leave it there.

However, if maximum power transfer is important when a specific number of speakers are in simultaneous operation, the

above chart will enable you to choose the optimum setting.

NOTE: The red-green light indicating system is self-powered and may flicker somewhat, especially if the driving

amplifier is operating at very low power. It requires approximately 1 Watt input minimum to light up the system. When

closely matched, the green indication may occasionally change to brief red flashes. This is due to the non-linear

characteristics of most speakers and need not be cause for concern. If the duration of red is longer than the green, the

Omnimatch (tm) control should be backed off one position or more until the green indication predominates.

IN-WALL MOUNTING:

USING YOUR AT-12: