What are the passive studio monitors with the largest size options available?

The ATC SCM12 Pro is a compact 2-way passive near-field studio monitor designed for critical listening in control rooms. It uses a 6in CLD mid/bass driver and a 1in dual suspension soft dome tweeter with a 2.2kHz passive crossover. It's suited to near-field and small-to-medium LCR surround monitoring setups.

The Quested H108 is a compact passive two-way near-field monitor with an 8in bass driver, 28mm soft-dome tweeter, low distortion, wide dispersion, and accurate stereo imaging. It suits project studios, broadcast, voice-over, mastering, editing, mobile, and installation applications that require professional monitoring in a limited space.

The H108C is a passive 2-way nearfield monitor with an 8 in low-frequency driver, 1.1 in silk-dome high-frequency driver, and improved crossover design. It suits mixing, mastering, broadcast, and other critical listening applications when used with a suitable external amplifier.

The Quested CX8 is a passive coaxial two-way ceiling monitor with an 8 in bass driver, 106 dB maximum SPL, and wide 53 Hz to 20 kHz response. It suits professional studios, immersive mixing rooms, and surround installations where an overhead or close-listening monitor is required.

The Amphion Two18 is a high-end passive two-way studio monitor with dual aluminum woofers, a titanium tweeter, passive radiator, and precise phase alignment. Its neutral presentation, wide sweet spot, and detailed imaging suit professional mixing, mastering, tracking, and critical nearfield monitoring.

The Amphion Two15 is a passive two-way nearfield monitor with dual aluminum woofers, a titanium tweeter, passive radiators, and a low 1600 Hz crossover for precise imaging. It suits producers, composers, mixing engineers, and mastering engineers who need accurate bass extension in smaller control rooms and already have an external power amplifier.