Before Dolby 5.1 surrond sound there were 4 channel quadraphonic receivers in the 1970s. Here is a great example, the Pioneer QX 747. Love 'em or hate 'em, no denying it's a beauty! #pioneerqx747 #quadraphonic #vintage | Mount Dora Vintage
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Before Dolby 5.1 surrond sound there were 4 channel quadraphoni…
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