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5.3 Output wiring

The Model 2150 speaker outputs on the amplifiers can accommodate wire from 20 gauge

up to 12. We recommend that you do not use speaker wire smaller than 20 gauge. You must

use Class I (NEC) wiring.

The greater the distance between the amplifier and the speakers, the larger the diameter the

wire should be. This will minimize power losses across the wire and improve damping of the

speaker. Wire thickness specifications (gauges) get larger as the wire gets thinner. A 14-

gauge wire is thicker than 18-gauge wire.

Using the following chart as a guide for low-impedence operation (4 , 8 ):

Wire Length

Up to 10'

10' to 15'

15' to 25'

25' to 40'

40' to 60'

Use the following as a guide for high-impedence operation (25V, 35V, 50V, 70V, 100V):

Wire Length

Up to 250'

250' to 500'

Caution: Be sure all the fine strands of the wire are twisted together and contained

within the connector. If even one strand is loose and can touch the adjacent terminal, a

short circuit may result.

5.3.1 Polarity

In order to have correct phasing between loudspeakers, you must connect them with consistent

polarity. While incorrect phasing will do no physical harm, it will diminish your bass response. It

is important that each speaker is connected to the amplifier as positive (+) to positive (+) and

negative (–) to negative (–).

5.3.2 STEREO/MONO and DUAL/MONO operation

The STEREO/MONO switch is located on the input board behind slot #2 of the standard

input module (see Figure 31). For dual-mono operation, move the STEREO/MONO switch

all the way to the left to the DUAL/MONO setting. Connect the input signal to CH 2 input

(CH 1 input becomes disabled). Connect the speakers to the speaker outputs on the

amplifier just as for normal stereo operation. Both speaker outputs will carry the signal

connected to the CH 2 input.

Note: When changing settings, always disconnect the power cord.

Gauge of Wire

20 gauge

18 gauge

16 gauge

14 gauge

12 gauge

Gauge of Wire

18 gauge

16 gauge

AM264080_00_V.pdf • June 21, 2002

5.0 Installation