I own the GMA Europas and on their own they have inadequate bass for rock music. For that matter every monitor I have ever heard has inadequate bass for rock.
I have my europas crossed with a REL strata sub at 45Hz and the overall effect is very seamless and very good. Rock .... no problem. Chamber music and jazz ... no problem.
I think for good rock reproduction you either need a sub under the monitors, or floor standing speakers.
The callisto is near identical in size and uses the same low frequency driver as the europa. I have no doubt it's a better speaker, but I just can't see it producing significantly more deep bass than the europa.
I have my europas crossed with a REL strata sub at 45Hz and the overall effect is very seamless and very good. Rock .... no problem. Chamber music and jazz ... no problem.
I think for good rock reproduction you either need a sub under the monitors, or floor standing speakers.
The callisto is near identical in size and uses the same low frequency driver as the europa. I have no doubt it's a better speaker, but I just can't see it producing significantly more deep bass than the europa.