PlayStation hardware unit sales declined during Sony's second financial quarter ended September 30.
Combined PS2 and PS3 sales came in at two million units, compared to 3.5 million during the same quarter of the previous fiscal year.
Combined PSP and Vita sales halved during the same timeframe, from 1.6 million units to 800,000. However, PlayStation software sales across all platforms jumped from 60 million units a year earlier to 93 million, Sony said.
The company's games arm reported a small loss of about $8 million for the second quarter, primarily due to the impact of a Vita price cut and unfavourable foreign exchange rates, in addition to PS4 development costs.
In August, when Sony announced a PS4 release date of November 15 in the US and November 29 in Europe, the company said more than one million PS4 pre-orders had been placed worldwide. The PS4 price is set at £349 / €399 / $399.