I have a couple. They average (strung) 345 g, swing weight 321, balance 8 pts HL. I haven't put it on an RDC, but the Spectrum was always advertised as less stiff than the Graphite, which was in the low 60s. I'd say it's about RA 60, noticeably more flexible than the Series 90 version.
The head, as with all the Series 110 rackets, was smaller than 110 sq inches. Mine have a string bed 333 mm long and 253 mm wide, which would be about 102.6 sq inches.
I have a little lead at 10 & 2 on the Spectrum and a lot of lead in the hoop of my Diablo MP, so they have similar swing weights and feel similar in the hand... except the Spectrum has an 8 mm longer string bed and a weight distribution much more even than the Diablo.
As a result, the Spectrum feels more solid to me on groundies, and the Diablo (as modded) brings much more pop/spin to the serve. If you played these days with a Spectrum (and perhaps depended more on a solid ground game than on a big serve) the racket would in no way limit your performance.