Ground Zero Iridium GZIW 250 10" 250W RMS 4-Ohm Cast Basket Car Subwoofer (300W Max)

The Ground Zero Audio Iridium GZIW 250 (MPN: GZIW 250 / GZIW250) is a high-efficiency 10-inch (25 cm / 250 mm) daily car and truck subwoofer engineered in Germany with a solid die-cast aluminum basket, 3D-structured HQPP cone, and deep 27 Hz resonance frequency (Fs). Rated at 250 Watts RMS (200W–300W recommended amplifier power) with a Single 4-Ohm voice coil, high 87 dB sensitivity, and a compact 5.08″ (129 mm) mounting depth, the Iridium GZIW 250 delivers warm, deep sub-bass from modest amplifier power.

Key Features & Acoustic Engineering

• Solid Cast Aluminum Basket & 3D HQPP Cone: Features a resonance-free die-cast aluminum basket, rigid 3D-structured HQPP cone, and long-stroke rubber surround for distortion-free bass reproduction.
• Deep 27 Hz Fs & 25 mm (0.98″) Xmax: Klippel®-optimized motor with a 50 mm (2″) copper voice coil and Polycot spider reaches down to 27 Hz for rich, full-bodied low-end extension.
• High 87 dB Sensitivity & 250W RMS Rating: Produces impressive output from just 200W to 300W RMS, making it ideal for daily drivers and factory-upgrade systems.
• Single 4-Ohm Impedance: Wire a single GZIW 250 to a 4-Ohm mono or bridged multi-channel amplifier, or wire two GZIW 250 10″ subwoofers in parallel to a 2-Ohm monoblock load.

Recommended Amplifier & Enclosure Pairing

• Amplifier Match (200W–300W RMS @ 4-Ohm): Pair with a compact micro mono amplifier (such as the Ground Zero GZRA 450.1-MICRO) or a 5-channel system amplifier from our Ground Zero Amplifiers collection.
• Enclosure Fitment Specs: Versatile 0.44 Qts design performs cleanly in both sealed and vented/ported 10-inch enclosures (5.08″ / 129 mm mounting depth; 1.74 cu. ft. / 49.3 L Vas).
• Explore More Ground Zero Subwoofers: Browse all Ground Zero Subwoofers in our catalog.

Technical Specifications & Thiele-Small Parameters

Authorized US Ground Zero Audio Dealer & Custom Installation in Toledo, OH: Ships fast from TDS Car Audio (6540 Central Ave, Suite O, Toledo, OH 43617). Custom enclosures and professional installation available across Toledo, Maumee, Perrysburg, Sylvania, Holland, Bowling Green, and Southeast Michigan. Call (419) 376-6140 for support.