I replaced the Celestion that came stock in my '68 Custom Vibro Champ Reverb. The Jupiter is louder and bigger sounding with better string separation. It has better bass response without sounding muddy. It sounds nicely balanced. The tone when driving the amp around 7 or 8 on the volume is glorious. I have to admit, though, that I should have opted for the speaker break-in, as it was a bit too bright at first. However, with only a couple of hours of playing time it is breaking in nicely.

This speaker is a fantastic upgrade for a 65 Princeton Reverb Reissue!

The Supro Delta King 10 had a very pronounced resonant peak at 100Hz. I decided to replace the speaker before I sold the amp. Very glad I did. This speaker is superb. Jupiter and Scumback are the best speakers out there right now.

Loving it!

Purchase alnico 10 for my princeton and it @##@#!# Amazing wow wow wow! Clarity and warmth no harsh top end very 3d.