The Carver Receiver" was 130wpc, and 157wpc at clipping. It morphed into The Carver Receiver 150. Neither one has a model number on it, either on the front or back. The Receiver 150 was rated at 150wpc, and 157wpc at clipping. Never stated any 4 ohm stats. The receiver 900 started life as a 90wpc affair, and morphed into 100wpc.
The Receiver 2000 was in the line long before any of the receivers with the HR prefix.
I was fortunate enough to get paid to demonstrate Carver products from 1991-1992. Before I started the job I requested they send me every owners manual, pamphlet, brochure, etc. regarding their products. I received a bundle, and if PMed would be happy to TRY and answer questions regarding individual component specs and stuff like that, right out of the Carver literature they sent me.