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RE: Anybody know Altec 604 -8H LF Woofer equivalent ?

The magnet return paths of the 604-8G and 604-8H are machined cast iron and machined and assembled iron tubing and discs respectively; otherwise these two tangerine versions of the 604 are identical. The fitted tubing and disc construction was used by Altec Lansing until the hard times that struck the company the latter seventies. The economy of this situation led to the abandonment of the construction inherited from Jim Lansing's field-coil driver implementations of 1936. A cast iron part was adopted that required height machining but no precision fitting and welding.

This economy of production had been adopted previously by JBL around 1954. Accordingly, the 515C is the cast pot version of the 515B. The 515C has a magnet with a hole through the center; most probably the same magnet as is necessary for the HF path of any 604. The 515C is what you seek.


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