Description
Offered for your consideration is a pair of vintage SEAS model 25F-WB 10 inch woofers, manufactured in Norway in 1978. They were removed from my Bang & Olufsen Beovox M75 four-way monitor speakers. These quality bass drivers may be correct for other B&O models from this production era, but the buyer is responsible for accurately assessing their suitability for their speakers. So, please see my large photos, the measurements, and read the remaining description to decide if these outstanding SEAS woofers are correct for your needs. This pair of SEAS woofers is in clean, excellent condition. The sturdy paper cones and voice coil dustcaps are both flawless. Plus, the black-enameled cast magnesium baskets are in great shape with no dings or scratches noted, just the expected faint scuffs around some mount holes as pictured. Also, the +/- terminals are keyed for polarity (red gasket side is positive) and I’ve retained a few inches of the input wires soldered to the terminals for the next owner’s convenience in retrofitting to their speakers. Most importantly, the aged original polyurethane foam suspension was just replaced with modern polyether foam surrounds specifically designed for this uncommon woofer platform. The main drawback to most U.S. and foreign-made speakers from the early 1970’s to 1990’s was the use of foam surrounds for woofer cone suspension. Though foam offers better excursion than coated linen and rubber, it invariably rots and/or disintegrates in 10-20 years no matter what climate you live in. These SEAS woofers were no exception—the surrounds had dried and stiffened, were cracked throughout, and broke from the lightest finger touch. Woofers in this condition should not be played. Some of you have replaced speaker surrounds before, so you know that it’s a time-consuming process that takes a great deal of patience and a steady hand. First, I cleaned the cone edges and basket flanges to remove the old gummy foam and stubborn factory adhesives, which takes some time to do thoroughly, and then glued the inner surrounds to the cones. Next, I glued the outer surround lips to the basket flanges after careful voice coil centering to verify no rubbing or distortion during play. Now these woofers are in great shape once again; perhaps even better than new with the improved polyether foam surrounds of today! They were fully tested after refoaming and sound terrific with strong, clear low frequency coverage extending well into midrange (as tested without a crossover shutting down their upper limit). Plus, I tested their DC resistance at a perfectly-matched 3.5? each, consistent with a nominal 4 ohm driver rating. Lastly, the basket flanges measure 10¼” diameter, they stand 3½” tall (not incl. the surround roll), and the six mount holes are equally spaced 3?” apart, c-t-c. This is a great find for someone that has foam-rotted, blown, or otherwise damaged woofers in their B&O Beovox M75 or other suitable model—your cherished speakers will be playing at their best once again! As pictured and described, this pair of SEAS 10” woofers, made for B&O, with painstakingly refurbished surrounds 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 $17.95 for very carefully packed shipping via U.S. Postal Service, FedEx, or UPS with tracking, delivery confirmation, and insurance. International purchases accepted from those able to pay with PayPal et. al. including shipping by U.S. Postal Service Priority Air Mail. Thanks for looking! *the cabinet label photos are presented only for donor model reference
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Ich biete 4 Lautsprecher. 2 Davon waren in der Werkstatt und wurden gewartet und funktionieren einwandfrei. Die anderen beiden müssen repariert werden, weshalb ich diese als defekt verkaufe. Der Beovox Uni-Phase M75 und sein größerer Bruder, der M100, ersetzten den früheren Beovox M70 und gehörten zu ihrer Zeit zur absoluten Spitzenklasse. Mit einer Klangwiedergabe in Studiomonitor-Qualität wurden sie sowohl von Musikliebhabern als auch von Tontechnikern gekauft. Eine spezielle elektronische Schaltung schützte die Lautsprecher vor Überlastung durch zu viel Leistung. Dieser spezielle Überlastungsschutz wurde in die meisten Beovox Uni-Phase-Lautsprecher der neuen Serie eingebaut, die sich selbst abschalteten, wenn die voreingestellte Leistungsschwelle erreicht war. Eine rote LED-Kontrollleuchte an der Unterseite des Frontgitters leuchtete auf, wenn die Überlastungsfunktion ausgelöst worden war. Ein spezieller Reset-Knopf brachte die Lautsprecher wieder in den Vollbetrieb. Mit ihrer guten Leistung war die Beovox M75 für mittelgroße Räume geeignet, wenn sie mit 75 W RMS ausreichend belastet werden konnte. Die Beovox M70/75 und M100 hatten den gleichen Mitteltöner, eine in Deutschland hergestellte ITT Schaub-Lorenz-Einheit (LPKM/130/50 120T), die von ihnen als 50-mm-Weichkalotte (vermutlich der Durchmesser der Schwingspule) in einem 130-mm-Gehäuse klassifiziert wurde; die Gewebekalotte selbst betrug etwa 55 mm und etwa 65 mm (gemessen) einschließlich ihrer Sicke. Im B&O-Lautsprecherprospekt von damals wird er als 2,5? (6,3cm) angegeben. Der Hochtöner für die Beovox M75 wer ein Audax 25mm Soft-Dome (HD12×9D25). Der Beovox M75 wurde mit einem eigenen Bodenständer versehen, um ihn auf die richtige Hörhöhe einzustellen. Der Ständer ermöglichte auch die Einstellung eines bestimmten Winkels nach vorne. Beovox M75 Specifications Type: 6314 Manufactured: 1976 - 1980 Designer: Jacob Jensen Continuous load 75 W Music load 125 W Impedance: 4 - 8 ohms Frequency response +4 -8 dB 27 - 20,000 Hz Sensitivity 5 W Gross volume 55 litre Woofer: 25cm Phase link unit: 12,5 cm Mid-range unit: 6cm Tweeter: 2,5cm Dimensions W x H x D: 35 x 65 x 27cm Weight 17kg
Tested fine.Cone is slightly sticky from factory. A little dust is unavoidable.ITT LPKM 130/50/120 T Note: Very heavy. More than 1,5Kg (each!)
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