This Sansui QRX-550 is one of Sansui’s Quadrophonic offerings. It puts out 30 per channel to four channels into 8ohms. It is part of the early beginnings of surround sound. I believe Sansui had six QRX quad offerings and the QRX-5500 was the middle of the spectrum receiver. It was produced in the early 70’s. There was also a QRX-5500A version that reflected a change in the syntax of the decoding from QS to QA and SQ. It has that classic early Sansui styling that was also found on the 9090DB.
The QRX-5500 had a number of decoding options such as:
– QS Synthesizer
Surround + Hall
– QS Regular Matrix
Surround + Hall
– Phase Matrix
– Discrete
– 2-Channel
The Sansui quad receivers are all fairly popular. They are difficult to find in full working condition but, when they are, they sell for reasonable prices. While the top of the line QRX-9001 sells for over $500.00 the middle of the road QRX-5500 sell for under $200.00.
Listings from eBay
Sansui QBL-100 4 Ch Remote Control For Quadraphonic QRX 5500 Receiver
 | $524.99 End Date: Monday Apr-6-2020 17:37:27 PDT Buy It Now for only: $524.99 Buy It Now | Add to watch list |
Sansui QRX-5500 QRX-3500 rebuild restoration recap service kit fix repair
 | $195.00 End Date: Sunday Apr-26-2020 8:22:27 PDT Buy It Now for only: $195.00 Buy It Now | Add to watch list |
Vintage Sansui QRX-3500 QRX-5500 QRX-6500 QRX-7500 front LED lamps bulbs lights
 | $38.50 End Date: Sunday Apr-12-2020 8:02:02 PDT Buy It Now for only: $38.50 Buy It Now | Add to watch list |
New Relay for Sansui QRX-5500 QRX-7500 QRX-8001 QRX-9001 Receiver
 | $19.99 End Date: Saturday May-2-2020 12:11:18 PDT Buy It Now for only: $19.99 Buy It Now | Add to watch list |
