I have an old Marshall JCM 800 Bass cabinet i bought about 15 years ago, it hasnt been in use in 10. Took off the back today for a look at it seems like its loaded with Rola Celestion Gl12-65s. These are not the reissues but the originals. From what i remember the cab with a Superlead 100 watt sounded very nice. Cant find too much out about these but it seems like they are louder Greenbacks. Is this true? Are they worth anything? I am thinking of making a 2x12 cab and putting 2 in and getting shot of the others. Also they are 15 ohms.Should these be treated at 16?