MTX Road Thunder Pro Subwoofer 15” Speaker Vintage Original Tested Works | eBay
(2) MTX 7515-44 15" 1500 Watt RMS Car Audio Subwoofers+Vented Sub Box Enclosure
MTX 5515-22 55 Series 15" subwoofer with dual 2-ohm voice coils at Crutchfield
55 Series 15" 2Ω Dual Voice Coil Subwoofer | MTX Audio - Serious About Sound®
MTX Thunder 5000 T5128 12" 8-ohm Component Subwoofer at Crutchfield
Best Buy: MTX 12" Single-Voice-Coil 4-Ohm Subwoofer US-XT12-04
MTX RTS15-44 Road Thunder Series 15" subwoofer with dual 4-ohm voice coils at Crutchfield
MTX RFL15 product page
MTX 9515-22 15" 3000w Competition Car Audio Subwoofer+Vented Sub Box Enclosure | Audio Savings
Car Subwoofer 15 "38 Cm Mtx Rt15-04 Sound Electronics Columns 94.7db Subwoofers For Cars Acoustics Auto Audio Parts Components Speaker - Subwoofers - AliExpress
Amazon.com: MTX Audio Terminator Series TNE212D 1,200-Watt Dual 12-Inch Sub Enclosure : Electronics
(2) MTX 5515-22 15" 1600w Car Subwoofers+Vented Sub Box+Mono Amplifier+Amp Kit