Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: JBL L830 3-Way High Performance 6-Inch Bookshelf Loudspeaker - Black (Pair)
Product description: The JBL Studio L830 is a 3-Way bookshelf loudspeaker that gives you great high frequency sound as well as impressive JBL low frequency performance. These speakers are designed to bring the feeling of a live performance into your living room.
Product feature: 1" pure titanium dome tweeter for exceptional high frequency performance, 3/4" Mylar-dome, cast-frame chassis mounted in a bi-radial horn for better high frequency repsonse, Aluminum waveguides provide better dispersion and a larger listening sweet spot, Freeflow port technology delivers great sound and makes sure you get the lowest amount of distortion
Product brand: JBL
Target attributes: Configuration
Answer: attribute: configuration
value: (pair)
source: product title