Rare Altec 604-8H drivers and the last of Altec alnico magnet 604s and includes the Altec crossovers that utilize dual equalization of the compression driver outputs. They are the last and the best Altec 604s because they were still Alnico yet with new tangerine phase plugs and improved more robust crossovers.
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Enter the H Model…
In early 2004 I acquired a pair of 604-8Hs, the last ALNICO magnet duplex model Altec produced before they switched to ferrite magnets. It was also the first Altec duplex model that combined the Tangerine phase plug with a constant directivity high frequency horn and a crossover that utilized dual equalization of the compression driver output. I swapped out my 604Bs for these Hs using the same cabinets, and was immediately impressed by the differences in output – well controlled upper mids, significantly more high frequency extension, improved imaging detail and more apparent bass & mid bass. What was in that Dual EQ crossover? Could it be adapted to older 604s as well?
I'll be listing these on eBay shortly and the price will be more to cover the eBay listing fees, so move fast.
If you want more pics, let me know. For example, I have pics showing the metering for both connections for both speakers. The numbers are the same as they should be.