Crown did a good job of making one of the world's most non-destructive amps with the DC-300 in the early 70s, so it could be done. So, short answer is that mixing was being done in the late 60s but the device costs had not come down until the 70s when big, high-power amps (competitively priced for the Joe-consumer type) were the pinnacle...
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But it wasn't just the technology that made the changes over time. Distribution channels and lower cost manufacturing had their parts also. I had trouble finding info on this. Everywhere I looked was talking about price changes from then until now. It got me frustrated, but this is what I found.
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Dell Computer Company?¦s direct business model Dell does not just outsourcing their production to contract manufacturers (suppliers) but also their after sales service. 2. Dell operates on the cutting edge of technology that enables suppliers to see Dell?¦s orders and production schedule...	2 / 344
Dell Strenghts 1 No Inventory build up- Dell does not stock in inventory. Dell makes their computers when the consumer requests it resulting in no inventory which will cut cost being that the company will not have any left over products they can’t sell...	1 / 213
Exchange However, the way Dell works is a complete different manner. Not only does Dell give near unlimited choices to the consumers, Dell also interacts with the consumers to learn more about their needs...	3 / 573
Dell 4 Ps Instead Dell reduced the selling prices of its products and services so customers received the lower prices immediately instead of having to wait on a mail-in rebate...	4 / 1010