As a previous owner of GMA speakers I would suggest you finish your cosmetic work and then spend some time listening before messing with the crossovers. While yes to a point Roy had to parts source to a price point he also parts sourced to a voicing he thought was correct for his designs. Following the advice of Kenjit and others and making wholesale changes and upgrades may result in nothing more than an unlistenable speaker with premium parts. I would trust Roy's judgement over the "self appointed" experts. But feel free to trust whoever you choose.