i just bought a new iriver chrome x imp 150 cd player thing. it didnt come with an ac power adapter, and in the manual, it says use only the one supplied with cd player (kind of weird). there is an ac power adapter that you can buy off the iriver website, though i do have a sony one from an old cd player. it is 4.5 volts and 500 mA. on the iriver website it says the chromeX needs 4.5 volts and 300 mA. can i still use this sony ac power adapter? thanks