Pioneer TS-600M, 6-1/2" 4-way Coaxial Speakers, 320W Max Power | 11mm Tweeter and 11mm Super Tweeter and 1-5/8" Cone Midrange | Coaxial Speakers | (Sold in Pairs) - Walmart.com
Pioneer 10-739A Midrange Speaker for S-710 Speaker | eBay
VINTAGE PIONEER HPM-60 MID RANGE SPEAKER ORIGINAL 10-719A | eBay
Pioneer TS-A652F A-Series 6-1/2" 3-way car speakers at Crutchfield
Amazon.com: Pioneer TS-M800PRO 8-Inch PRO Series High Efficiency Mid-Bass Car Speaker Drivers - Pair (Discontinued by Manufacturer) , Black : Electronics