Diablo+Sub combination (and in that respect most other similar 6.5"+1" monitors i have heard) sounds diferent from fulrange. with monitor+sub you will not be able to enjoy fullrange orchestra or lets say feel uper bass percusion intrument hits physicaly- its imposible task. or to play loud without any hint strain or compression.
however if you afer small jazz/clasical works or female/male voice (inspite bigger clasical works and opera voices) and need to save space- Diablo +sub would be option. at least to theese points Diablo+ utopia III sub would be more or less similar to Scala, (and from personal expierence) diablo being more open in midrange than Scala as well as much heavier midbass- good and elegant solution in big roms. but no way this combo will compete head to head with Maestro.
however if you afer small jazz/clasical works or female/male voice (inspite bigger clasical works and opera voices) and need to save space- Diablo +sub would be option. at least to theese points Diablo+ utopia III sub would be more or less similar to Scala, (and from personal expierence) diablo being more open in midrange than Scala as well as much heavier midbass- good and elegant solution in big roms. but no way this combo will compete head to head with Maestro.