Onkyo SV-515PRO (c. 1993)
Little is documented about the Onkyo SV-515PRO. The period record shows a receiver, listed in at least one contemporary test as the TX-SV515PRO. It got proper lab-and-listening coverage in HiFI-Stereo (October 1993, p.89), where it ran against the Pioneer VSX-502 and the Yamaha RX-V470 at $530. The magazine's framing (p.88) was that the three models mixed features, performance, and operating convenience differently, in ways a spec sheet didn't reveal. The differences showed up once you put them to work in a real system.
The only technical detail the review singles out is Onkyo's "Hall" surround mode. HiFI-Stereo compared it to the early delay-line ambience circuits from AudioPulse and ADS. It generated simple reflection patterns, and the review found that austerity had both good and bad sides. Beyond that, the trail goes quiet. No manual, no production dates, and no measured specifications have surfaced. A reader with the manual or a service sheet would fill a gap.
- Listed as: Onkyo TX-SV515PRO (A/V receiver)
- Price at test: $530
- Also in test: Pioneer VSX-502 ($520), Yamaha RX-V470 ($499)
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