This is the driver's bread and butter. If you listen to jazz, vocals, or acoustic tracks, the JL-SPP offers a texture that is frankly addictive. When a stand-up bass is plucked, you don't just hear the note; you hear the friction of the finger on the string and the wood of the body resonating. It’s that "you are there" quality that usually costs three times the price.

I fired up the JL-SPP expecting a warm, wooly sound typical of older paper drivers. What I got instead was a shock of clarity.

In JL’s SDK (e.g., "AC695N_sdk", "AC692_sdk"), the SPP driver is part of the Bluetooth stack.