Ashdown make amps, not basses. Why would you want Ashdown on your headstock?
It's like Markbass trying to make basses. Hasn't gone too well for them so far.
I know that people are going to say Fender and Gibson make/or have made both... but they are amongst the oldest in the business when choice was somewhat limited.
Out of interest, how many amp manufacturers have actually succeeded and continue to have a foot in both camps...? (Vox aren't really in it anymore... neither are Musicman).