Bose 1800-VI Owner's Manual - Page 12

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4.0 Installation

4.8 Output wiring

Use heavy gauge wire for speaker connections. 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. So a 14-gauge wire is thicker

than 18-gauge wire. Use the following chart as a guide.

Wire Length

Up to 15'

15' to 25'

25' to 40'

40' to 60'

60' to 100'

100' to 150'

150' to 250'

This will keep the resistance of the speaker wire to less than 5% of 4 ohms and the

transmission loss to less than 0.5 dB.

The multi-way binding posts can accept spade lug, bare wire, or banana connections. 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.

You must use Class I (NEC) wiring.

4.8.1 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.

The key is to make sure both speakers are connected to the speaker terminals the same way.

Connect – at the speaker outputs to – on the back of the speaker, and + at the speaker

outputs to + on the back of the speaker.

4.8.2 Dual mono

The stereo/mono switch is located on the input board behind slot #2 of the standard input

module (or, on the AMC-1 module, to the left along the rear edge of the board). For dual-

mono operation, move the STEREO/MONO switch all the way to the left to the DUAL

setting (or, on the AMC-1 module, move that switch all the way to the right). 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.

Gauge of Wire

18 gauge

16 gauge

14 gauge

12 gauge

10 gauge

8 gauge

6 gauge