I have an RF T5001bd amp. Is is still in the plastic "baggie" from RF. Rated is 250x1 into 2 ohms but they usually run a little over 600 into 2 (I assume at 14v?). No box, no book, no birthsheet, just the amp it its plastic cocoon. Small size too - about 2"x13"x14". I was going to use this but just picked up an Alpine PDX amp for the front stage and I think I will get the PDX-1.600 for the sub and stack them.Looking for Mono 400rms x 1 @ 2ohm. Post if have you this or something close. Thanks