SKU: retrosound-rtw84-shallow-mount-subwoofer-4ohm RetroSound 8 Inch R-TW84 Shallow Mount 4 Ohm Subwoofer

RetroSound R-TW84 Shallow Mount 4 Ohm Subwoofer

Bring powerful, full-bodied bass to your classic without sacrificing space. The RetroSound R-TW 84 is an ultra-thin 8-inch (20cm) subwoofer engineered for vehicles where every inch counts. With a mounting depth of just 2 inches / 5 cm, it's the perfect solution for classic cars and trucks that have limited room for modern audio upgrades. Built around a rigid cast aluminium basket and driven by a high-performance neodymium magnet structure, the R-TW84 delivers a tight, accurate low-end that complements your music rather than overpowering it. A durable polypropylene cone and Santoprene surround ensure smooth, natural bass reproduction, while the 1¾ inch voice coil with Kapton former keeps performance consistent under heavy load. Optimised for sealed enclosures from 3.4 to 28.3 litres (0.12 to 1 cubic foot), this subwoofer adapts easily to under-seat, behind-seat, or custom-fit installations, giving you flexibility without compromising sound. With 250 watts RMS (500 watts peak) of clean, controlled power handling, the R-TW84 brings modern performance to your classic ride in a design built for tight spaces.

For the ultimate setup, match the R-TW84 with the RetroSound Technophonic 5-Channel Class D Amplifier or the Stereophonic 3-Channel Class D Amplifier. These powerhouses deliver dedicated subwoofer output along with four or two full-range channels to drive your entire system. Together, the Technophonic and R-TW84 create a seamless balance of clarity and low-end punch, perfect for enthusiasts who want modern performance without taking away from their vehicle's classic character.

Please refer to the dimension diagram to ensure clearance in your vehicle. With a 50mm mounting depth and 203mm cutout, this unit is designed for exceptionally tight spaces like under-seat enclosures or thin door cards.

Specifications:

• 8-inch (203mm) shallow-mount subwoofer
• Optimised for sealed enclosures: 3.4 to 28.3 litres (0.12 to 1 cubic foot)
• Mounting depth: 50mm (1.97")
• Total overall height: 61.2mm (2.4")
• Outer diameter: 218mm (8.58")
• Cutout diameter: 203mm (8")
• Voice coil diameter: 1 ¾ inches with Kapton former
• Neodymium magnet structure for ultra-thin profile
• Rigid cast aluminium basket
• Durable polypropylene cone with Santoprene surround
• Peak power handling: 500 Watts
• RMS power handling: 250 Watts
• Nominal impedance: 4 Ohm
• DC resistance (Re): 3.5 Ohm
• Resonance frequency (fs): 33 Hz
• Frequency range: 32–5000 Hz
• Sensitivity (SPL): 88 dB
• Equivalent air volume (Vas): 18.6 Litres
• BL Factor: 9.871
• Mechanical Q factor (Qms): 5.619
• Electrical Q factor (Qes): 0.979
• Total Q factor (Qts): 0.834
• Effective Moving Mass (Mms): 128.2 g
• Mechanical Compliance (Cms): 173.5 µM/N
• Sold as one / each