Audio Test Tones - ProfessionalBy N9 Technologies LLC ( $1.99 )
Professional Audio Test Tones for testing your Audio Systems Equipment. Test speaker frequency ranges to specifications. All Tones are Lossless WAV Format, 1 semitone files. Tones include: Sine Waves: 50Hz, 100Hz, 200Hz, 440Hz, 800Hz, 1kHz, 2kHz, 4kHz, 8kHz, ...