Description
Offered for your consideration is a vintage Polk Audio 6½ inch mid/bass woofer removed from my early Polk Audio Monitor 7 speakers, USA-manufactured in 1977. In the late 1970’s, one of the companies that Polk sourced woofers from was an Illinois raw driver manufacturer named Matrecs (EIA source code 557, stamped on the magnet cover)—known today as MiTek/MTX—and this example bears their part number 6 KU 132. Its the same part number woofer Id found some time ago in a pair of Polk Monitor 10 speakers, also from 1977. Polk would switch suppliers a few years later and began the practice of placing a decal with their own part number over the entire magnet cover. This woofer differs slightly in appearance from the 1980’s Polk 6½” mid-woofers since it has a layered-paper flange gasket, and a natural metal color basket instead of being enameled black. The gasket was not found on the later Polk MW6501, MW6502, MW6503, and MW6510. Polk used the MW6502 mid/bass woofer in the Monitor 7, and a few other models, in the 1980s. So, please take a look at my large photos and read the remaining description to decide if this hard-to-find Polk woofer is correct for your speaker. *Although the listing is written largely in singular to avoid any confusion, two (2) identical 1977 Polk Audio 6½” woofers are available at time of this writing. Please choose if you’d like to buy one or both in the quantity field at the top of the listing. The shipping cost will be automatically calculated by eBay checkout. This Polk woofer is in clean, very good condition. The sturdy, poly-coated paper cone is in great shape structurally as is the voice coil dustcap and permanent rubber surround. There’s just some dust that won’t let go of the tacky cone coating which is typical with these. Plus, the galvanized steel basket is in great shape with no dings or finish loss, just a few nicks on the flange gasket, some common basket oxidation, and a spot of surface rust on the magnet cover, as pictured (the first woofer to sell—not pictured—has a clean magnet cover and crisp, completely-visible EIA source/date code stamp). Whats more, this woofer came from the era where Polk soldered all connections, so I’ve left several inches of input wire to simplify splicing-in to the new owner’s early Polk speaker(s). I should mention that in the vintage Polk world, black is the positive wire, instead of negative like everywhere else. And, if retrofitting to a later Polk Audio speaker, the wires I’ve left can be de-soldered or snipped, and the other two terminals can be used with female .205” clips. Overall, it’s a very nicely-preserved mid/bass woofer. Most importantly, it’s been fully tested and sounds fantastic—strong output with fast, detailed midrange and solid bass for the platform size. The exceptionally sturdy 6½” was the mainstay of Polk’s product line for many years, and for good reason—it sounds quite remarkable. Plus, I tested the DC resistance at 6.6?, consistent with a nominal 8 ohm driver rating. Lastly, the basket measures 6?” diameter, it stands 3” tall, and the mount hole spacing is 4½” adjacent / 6¼” diagonal, c-t-c. So, as pictured and described, this early Polk Audio Monitor 7 woofer is offered at a competitive price. Terms of Sale: I encourage interested parties to ask any questions they may have about this listing before committing to purchase. Payment is due at checkout by PayPal or other accepted methods. U.S. mailing addresses will pay $13.95 for very carefully packed shipping via U.S. Postal Service, FedEx, or UPS with tracking and delivery confirmation. International purchases accepted only from those who are able to pay with PayPal including shipping by U.S. Postal Service Global Priority Air Mail. Thanks for looking!
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