Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: JBL ES30CH 3-Way, 6 1/2" Bookshelf Speaker - Cherry (Pair) (Discontinued by Manufacturer)
Product description: The JBl ES30 is a 3-Way bookshelf speaker designed to give your home theater sytem the best possible sound. It utilizes the 6 1/2" woofer to give you the excellent bass JBL is famous for. These speakers will give you higher highs and better imaging due to the advance designs by JBL who is a leader in both home and professional speaker design. These speakers are available in both cherry and black.
Product feature: The JBL ES Series uses cellulose-fiber cones reinforced with a ploymer coating for uniform pistonic motion: this eliminates internal resonances, Without increasing cone mass. This means tighter, more precise imaging over a wider listening area.
Product brand: JBL
Target attributes: Configuration
Answer: attribute: configuration
value: (pair)
source: product title