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Increase attention to speech and language! TSI: Boost Passive contains great music with sound concentrated in the “speech and language range” (750-4000 Hz.). Use the passive tracks over speakers as pleasant, unintrusive background music to enhance your sound environment, filter distracting sounds, and be entrenched in frequencies most significant for auditory processing. This product is available as downloadable (Zipped WAV) files or on Compact Disc (1 Disc). Please select your option above. Or Save 10% with our Boost sets—set of 3 CDs for only $54.99 Set 1—one active Boost disc and two passive Boost discs Set 2—one active Boost disc and two passive Boost discs
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🇺🇸 Ship from USA · On Agora since 2025
$19.99