Fixed frame: mechanically simple
A fixed frame keeps the projection surface tensioned and available at all times. There is no motor, roller or deployment cycle, which reduces mechanical failure points and makes alignment repeatable. In a dedicated theater, that simplicity is a major advantage.
Floor-rising: architecture-friendly
A floor-rising screen hides in its base, which preserves artwork, windows or a clean wall behind it. It can be attractive in living rooms where the screen is used a few evenings a week rather than serving as a permanent architectural feature.
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Check current price ↗Flatness and alignment
UST projectors exaggerate waves and geometry errors because the light hits the screen at a steep angle. Both formats therefore need a genuinely flat surface. Fixed frames achieve this with permanent tension. Better floor-rising systems use side tensioning and carefully controlled roll-up mechanisms. Precise projector alignment still matters with either format.
Which format fits the PET Crystal Classic buyer
The PET Crystal Classic exists for the person who values concealment enough to accept the added motorized mechanism. If your main criterion is “least complexity,” read the screen-vs-wall and fixed-frame sections first. If your criterion is “large UST image without a permanent screen,” floor-rising is the relevant path.