a smartphone having a software application disposed thereon, the smartphone comprising a plurality of inputs, wherein each of the plurality of inputs is configured to receive an audio signal, a processor, wherein the processor processes the audio signal to form a processed audio signal, and at least one audio output, where the at least one audio output sends a wireless signal to a bone conduction headset, wherein the bone conduction headset is configured to play the processed audio signal,

wherein the software application generates an audiogram measuring hearing loss by testing a user via the headset and further wherein the processed signal sent to the headset is adjusted based on the audiogram,

wherein the testing of the user via the headset measures a threshold (THR) level, wherein the user inputs to the smartphone a first spectral value where the user barely hears an audio signal, a most comfortable level, where the user inputs to the smartphone a second spectral value where the user is most comfortable receiving audio signals, and an uncomfortable level, where the user inputs to the smartphone a third spectral value where the user becomes uncomfortable receiving audio signals,

wherein the processed signal sent to the bone conduction headset is processed based on the first, second, and third spectral values, and further wherein the processed signal includes frequencies above about 4 KHz.