For a given type of headphone, the sound pressure levels of pure tones at which an adequate number of young listeners without hearing loss just perceived the tones is called Reference Equivalent Threshold Sound Pressure Levels (RETSPLs). Current standards and norms have established RETSPL values for specific headphones; other headphones do not have such values. Although the Sennheiser HD 650 circumaural headphone is often used in behavioral experiments and listening tests, its RETSPL values have not yet been published. The HD 650 circumaural headphone was measured at frequencies between 125 Hz and 16 kHz for twenty five young listeners whose ages were in the range of 19 to 28 years in order to establish a RETSPL value. In addition, the paper compares the currently measured RETSPLs with several other types of circumaural and supra-aural headphones: the Sennheiser HDA 300, the Sennheiser HDA 200, the Beyer DT 48, and the Telephonics TDH 39. The results showed significant differences between the data for circumaural and supra-aural headphones at low frequencies below 500 Hz.
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