Check the listing for details. [US SELELR] Taramps Audio Processor PRO 2.4BT – DSP Bluetooth Control via App. Condition: New, Made in Brazil. Listed at 99.99 USD. Please ask any and all questions before purchasing!A DSP (Digital Signal Processor) is a device placed between the audio source (factory radio, aftermarket head unit, mobile device, etc.) and the amplifier. A DSP allows you to dial in your sound with exact settings, getting the most out of your speakers, subwoofers, and amplifiers. It’s the key to turning good into great.The Pro 2.4 BT DSP gives you all the tools you need and full access to real-time audio tuning from your smartphone or tablet.The app allows you to control up to 4 DSPs from the same smartphone and its interface allow portrait or landscape mode.And there’s more: even before renaming the DSP, the app automatically shows which one is closest, helping you quickly identify the DSP and the system you want to tune.