Details CT Sounds is proud to introduce the hydro shallow mount subwoofer series after completing a rigorous R&D process spanning 2 years! Our goal was to engineer a 300-watt 8” shallow-mount subwoofer with a mounting depth below 3.5” that was suitable for both sealed & ported enclosures. To achieve this, we focused on the EBP (Efficiency Bandwidth Product). As a general rule, EBP < 50, is used only for sealed enclosures, EBP 50 - 100, is used for both, and EBP > 100, is used only for ported enclosures. EBP = FS/QES. Quick Facts: RMS Power: 300 Watts MAX Power: 600 Watts Voice Coil Configuration: Dual 2 Ohm Use Cases: Sealed & Ported Enclosures Our 1st prototype utilized a 50.8 mm voice coil & 30 oz magnet resulting in a high QES rating of 1.05 and low EBP of 44.1. The 2nd prototype utilized a 44.7 mm voice coil & 30 oz magnet resulting in a slightly lower QES rating of 0.843 and a slightly higher EBP of 54.8. After the 1st and 2nd prototypes, we determined a larger motor assembly was needed to provide a more controlled electrical system (lower QES). This led us to invest in a custom-tooled basket (used in the final prototype) to keep the mounting depth below 3.5”. The 3rd and final prototype uses a 44.7 mm voice coil & 40 oz magnet resulting in a reduced QES rating of 0.577 and a balanced EBP of 80.07. In testing, we ran into mechanical noise due to the larger motor assembly and voice coil in a confined space. Therefore, we invested in a custom-tooled cone to maximize the excursion capability by creating an equal distance between the cone, spider, and bottom plate. The result is an 8” shallow-mount subwoofer that is extremely responsive in both sealed & ported enclosures. Specs General Specifications: Product Type: Car Subwoofer Subwoofer Size: 8" Voice Coil Configuration: Dual 2 Ohm RMS Power: 300 Watts MAX Power: 600 Watts Voice Coil Type: 1.75 Inch - 4 Layer High-Temperature Copper Voice Coil Magnet Type: Y35 Bottom Plate Type: Low Carbon Iron Surround Type: Dual White Stitched Competition Mega Foam Surround Cone Type: Composite Paper with 3% Carbon Fiber Reinforcement Tinsel Lead Type: Single Braided Flat Copper Tinsel Leads Terminal Type: 12 Gauge Push Terminals Basket Type: Stamped Steel Spider Material: Poly-Cotton Blend T/S Parameters: Qes: 0.577 Qms: 6.549 Qts: 0.531 Fs: 46.20 Hz Vas: 10.298 L Mms: 82.895 g Cms: 0.143 m/N Re: 3.9 Ω Bl: 12.751 Tm Le: / Sd: 227 cm² Xmax - Single Way (mm): 8 mm Xmax - Single Way (cm): 0.8 cm Vd (Sd*Xmax): 181.6 cm² SPL: 84.48 dB Box Specs Subwoofer Measurements: Cutout diameter 7.51" Overall diameter 8.77" Mounting depth 3.26" Box Specifications: Displacement 0.02 ft3 Box Recommendations: Sealed 0.35 ft3 Ported 0.875 ft3 Tuning Frequency 36 Hz Port Area 14 in2 *Enclosure recommendations do not account for subwoofer, bracing, and port displacement. Details CT Sounds is proud to introduce the hydro shallow mount subwoofer series after completing a rigorous R&D process spanning 2 years! Our goal was to engineer a 300-watt 8” shallow-mount subwoofer with a mounting depth below 3.5” that was suitable for both sealed & ported enclosures. To achieve this, we focused on the EBP (Efficiency Bandwidth Product). As a general rule, EBP < 50, is used only for sealed enclosures, EBP 50 - 100, is used for both, and EBP > 100, is used only for ported enclosures. EBP = FS/QES. Quick Facts: RMS Power: 300 Watts MAX Power: 600 Watts Coil Configuration: Dual 4 Ohm Use Cases: Sealed & Ported Enclosures Our 1st prototype utilized a 50.8 mm voice coil & 30 oz magnet resulting in a high QES rating of 1.21 and low EBP of 39.23. The 2nd prototype utilized a 44.7 mm voice coil & 30 oz magnet resulting in a slightly lower QES rating of 0.976 and a slightly higher EBP of 48.64. After the 1st and 2nd prototypes, we determined a larger motor assembly was needed to provide a more controlled electrical system (lower QES). This led us to invest in a custom-tooled basket (used in the final prototype) to keep the mounting depth below 3.5”. The 3rd and final prototype uses a 44.7 mm voice coil & 40 oz magnet resulting in a reduced QES rating of 0.668 and a balanced EBP of 71.06. In testing, we ran into mechanical noise due to the larger motor assembly and voice coil in a confined space. Therefore, we invested in a custom-tooled cone to maximize the excursion capability by creating an equal distance between the cone, spider, and bottom plate. The result is an 8” shallow-mount subwoofer that is extremely responsive in both sealed & ported enclosures. Specs General Specifications: Product Type: Car Subwoofer Subwoofer Size: 8" Voice Coil Configuration: Dual 4 Ohm RMS Power: 300 Watts MAX Power: 600 Watts Voice Coil Type: 1.75 Inch - 4 Layer High-Temperature Copper Voice Coil Magnet Type: Y35 Bottom Plate Type: Low Carbon Iron Surround Type: Dual White Stitched Competition Mega Foam Surround Cone Type: Composite Paper with 3% Carbon Fiber Reinforcement Tinsel Lead Type: Single Braided Flat Copper Tinsel Leads Terminal Type: 12 Gauge Push Terminals Basket Type: Stamped Steel Spider Material: Poly-Cotton Blend T/S Parameters: Qes: 0.668 Qms: 6.083 Qts: 0.602 Fs: 47.47 Hz Vas: 10.427 L Mms: 77.535 g Cms: 0.145 m/N Re: 6.4 Ω Bl: 14.880 Tm Le: / Sd: 227 cm² Xmax - Single Way (mm): 8 mm Xmax - Single Way (cm): 0.8 cm Vd (Sd*Xmax): 181.6 cm² SPL: 84.48 dB Box Specs Subwoofer Measurements: Cutout diameter 7.51" Overall diameter 8.77" Mounting depth 3.26" Box Specifications: Displacement 0.02 ft3 Box Recommendations: Sealed 0.35 ft3 Ported 0.875 ft3 Tuning Frequency 36 Hz Port Area 14 in2 *Enclosure recommendations do not account for subwoofer, bracing, and port displacement. Wiring Calc. #calc#
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