Sound field forming circuit and sound field forming apparatus

A sound field forming circuit comprising:

• a first tone control circuit which variably adjusts a characteristic of a first predetermined frequency band of an audio signal;
• a second tone control circuit which variably adjusts a characteristic of a second predetermined frequency band of the audio signal;
• first and second channels which output audio signals that are supplied from the first and second tone control circuits, respectively;
• a first switch portion which switchingly supplies one of an audio signal from a sound source and the audio signal output from the second tone control circuit, to the first tone control circuit;
• a second switch portion which switchingly supplies one of the audio signal from the sound source and the audio signal output from the first tone control circuit, to the second tone control circuit;
• a third switch portion which switchingly supplies one of the audio signal output from the first tone control circuit and the audio signal output from the second tone control circuit, to the first channel;
• and
• a fourth switch portion which switchingly supplies one of the audio signal output from the first tone control circuit and the audio signal output from the second tone control circuit, to the second channel.