Loudspeaker

An output method for a warning sound, the method comprising the steps of:

• (a) connecting a warning apparatus to a loudspeaker that also is connected to an audio apparatus that supplies, to the loudspeaker, an audio signal indicative of a sound output from a first amplifier;
• (b) supplying, to the loudspeaker, a warning signal indicative of the warning sound output from a second amplifier of the warning apparatus, the warning signal being supplied via a resistor having an impedance greater than an impedance of an internal resistance of the loudspeaker;
• and
• (c) outputting the warning sound from the loudspeaker.

A transmission apparatus that transmits a signal to a loudspeaker that has an internal resistance having an impedance, the transmission apparatus comprising:

• a first transmission system that transmits, to the loudspeaker, an audio signal indicative of a sound output from a first amplifier;
• and
• a second transmission system that transmits to the loudspeaker a warning signal indicative of a warning sound output from a second amplifier, the second transmission system connected in parallel to the first transmission system, wherein
• the second transmission system includes a resistor having an impedance greater than the impedance of the internal resistance of the loudspeaker, and transmits the warning signal to the loudspeaker via the resistor.