Reviews Mechanical Suspension Series

SA-12 D4 CLASSIC - Sundown Audio 12' 750W Dual 4-Ohm SA Series Subwoofer

  • Sundown Audio U-12 D4 12″ 1500W RMS Dual 4-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 6.1 Ω | Resonance Frequency (Fs): 40.0 Hz | Equivalent Volume (Vas): 12.3 L | Electrical Q Factor (Qes): 0.38 | Mechanical Q Factor (Qms): 2.93 | Total Q Factor (Qts): 0.34 | Force Factor (BL): 33.7 NA | Moving Mass (incl. Air Load) (Mms): 284.5 g | Suspension Compliance (Cms): 0.06 mm/N | Sensitivity: 85.0 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 1.0 cu. ft. | Ported Enclosure Suggestion: 2.0 cu. ft. | Displacement: 0.21 cu. ft. | Depth: 7.75 in | Outside Diameter: 12.83 in | Cutout: 11.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 32 sq. in..
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Rotary 14845 Comfort Ride Mower Seat with Armrests

  • The ROP Shop replacement Seat Suspension Kit.
  • Specs - Mechanical Suspension. Suspension Stroke: 4". Slide Track Fore & Aft Travel: 6" center to center & 6.75" rail to rail. Weight Adjustment from 110lbs - 330lbs. Refer to images 2 & 3 for more information.
  • comes as shown in the first image (does NOT come with instructions or hardware).
  • This item is a universal suspension kit meant for flat mounting surfaces, but some units and models fabrication may be required for mounting on your machine, however we are unable to verify what applications would need fabrication. The fourth picture shows a schematic of the bolt pattern for mounting to the frame.
  • Long Lever (Black) is for the slide track. Handle Lever (Gray), in the middle, is for adjusting the weight. Star Shaped Knob (Gray) is to adjust the suspension up or down.
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Sundown Audio U-12 D2 12' 1500W RMS Dual 2-Ohm U-Series Subwoofer

  • Sundown Audio U-12 D4 12″ 1500W RMS Dual 4-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 6.1 Ω | Resonance Frequency (Fs): 40.0 Hz | Equivalent Volume (Vas): 12.3 L | Electrical Q Factor (Qes): 0.38 | Mechanical Q Factor (Qms): 2.93 | Total Q Factor (Qts): 0.34 | Force Factor (BL): 33.7 NA | Moving Mass (incl. Air Load) (Mms): 284.5 g | Suspension Compliance (Cms): 0.06 mm/N | Sensitivity: 85.0 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 1.0 cu. ft. | Ported Enclosure Suggestion: 2.0 cu. ft. | Displacement: 0.21 cu. ft. | Depth: 7.75 in | Outside Diameter: 12.83 in | Cutout: 11.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 32 sq. in..
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SUNDOWN AUDIO SD-4 12 D4 12' 600W RMS Dual 4-OHM Shallow SUBWOOFER Speaker New

  • Sundown Audio U-12 D4 12″ 1500W RMS Dual 4-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 6.1 Ω | Resonance Frequency (Fs): 40.0 Hz | Equivalent Volume (Vas): 12.3 L | Electrical Q Factor (Qes): 0.38 | Mechanical Q Factor (Qms): 2.93 | Total Q Factor (Qts): 0.34 | Force Factor (BL): 33.7 NA | Moving Mass (incl. Air Load) (Mms): 284.5 g | Suspension Compliance (Cms): 0.06 mm/N | Sensitivity: 85.0 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 1.0 cu. ft. | Ported Enclosure Suggestion: 2.0 cu. ft. | Displacement: 0.21 cu. ft. | Depth: 7.75 in | Outside Diameter: 12.83 in | Cutout: 11.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 32 sq. in..
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(2) Memphis Audio MJP1522 15' 1500w MOJO Pro Car Audio Subwoofers DVC 2 ohm Subs

  • ... shorting ring for reduced inductance. Foam surround. Rigid paper cone. Progressive spider. Diecast basket. Single Sided compression terminals. Size: 15 Inch. Voice coil: DUAL 2Ω. RMS/PEAK: 750/1500 Watts. SENS: 87 dB. DEPTH: 7.88 Inch. CUT OUT: 13.84 Inch.
  • Thiele Small Parameters: Resonant Frequency (fs): 33.6 Hz. Mechanical Q (Qms): 7.95. Electrical Q (Qes): 0.823. Total Q (Qts): 0.746. Sensitivity: 87 dB. Xmax Linear: 0.51 in. Displacement: 0.29 cf. Air Volume of Suspension (Vas): 2.31 cf. Moving Mass (Mms): 334.4 g. Suspension Compliance (Cms): 0.067 mmN. Effective Piston area (Sd): 829.58 SqCm. Motor Strength (Bl): 9.3 TM. DC Resistance: 1 Ohms.
  • Voice Coil & Magnet: Impedance Series: 4 ohms. Impedance Parallel: 1 ohms. Voice Coil Diameter: 2.5 in. RMS Power: 750 watts. Peak Power: 1500 watts. Magnet Weight: 120 oz. Magnet Diameter: 6.69 in. Physical Dimensions: Mounting Depth: 7.88 in. Cutout Diameter: 13.84 in. Frame Outside Diameter: 15.9 in.
  • Enclosure Recommendations: Single Sub Sealed: 2.6 cf. Dual Subs Sealed: 5 cf. Single Sub Vented: 4.4 cf. Port Dimensions: 7″ x 6″ x 28″L in. Tuning Frequency: 34 Hz. Dual Sub Vented: 8.5 cf. Port Dimensions: 9″ x 9″ x 22″L in. Tuning Frequency: 34.
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(2) Memphis Audio MJP1544 15' 1500w MOJO Pro Car Audio Subwoofers DVC 4 ohm Subs

  • ... shorting ring for reduced inductance. Foam surround. Rigid paper cone. Progressive spider. Diecast basket. Single Sided compression terminals. Size: 15 Inch. Voice coil: DUAL 4Ω. RMS/PEAK: 750/1500 Watts. SENS: 88 dB. DEPTH: 7.88 Inch. CUT OUT: 13.84 Inch.
  • Thiele Small Parameters: Resonant Frequency (fs): 31.2 Hz. Mechanical Q (Qms): 6.558. Electrical Q (Qes): 0.727. Total Q (Qts): 0.65. Sensitivity: 88 dB. Xmax Linear: 0.51 in. Displacement: 0.29 cf. Air Volume of Suspension (Vas): 2.93 cf. Moving Mass (Mms): 305.92 g. Suspension Compliance (Cms): 0.085 mmN. Effective Piston area (Sd): 829.58 SqCm. Motor Strength (Bl): 12 TM. DC Resistance: 1.75 Ohms.
  • Voice Coil & Magnet: Impedance Series: 8 ohms. Impedance Parallel: 2 ohms. Voice Coil Diameter: 2.5 in. RMS Power: 750 watts. Peak Power: 1500 watts. Magnet Weight: 120 oz. Magnet Diameter: 6.69 in.
  • Physical Dimensions: Mounting Depth: 7.88 in. Cutout Diameter: 13.84 in. Frame Outside Diameter: 15.9 in. Enclosure Recommendations: Single Sub Sealed: 2.6 cf. Dual Subs Sealed: 5 cf. Single Sub Vented: 4.4 cf. Port Dimensions: 7″ x 6″ x 28″L in. Tuning Frequency: 34 Hz. Dual Sub Vented: 8.5 cf. Port Dimensions: 9″ x 9″ x 22″L in. Tuning Frequency: 34.
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Sundown Audio U-18 D2 18" 1500W RMS Dual 2-Ohm U-Series Subwoofer

  • Sundown Audio U-18 D2 18" 1500W RMS Dual 2-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 3.8 Ω | Resonance Frequency (Fs): 31.3 Hz | Equivalent Volume (Vas): 135.4 L | Electrical Q Factor (Qes): 0.37 | Mechanical Q Factor (Qms): 3.41 | Total Q Factor (Qts): 0.33 | Voice Coil Inductance (Le): 2.62 mH | Force Factor (BL): 29.9 NA | Moving Mass (incl. Air Load) (Mms): 444.1 g | Suspension Compliance (Cms): 0.06 mm/N | Sensitivity: 92.3 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 3.0 cu. ft. | Ported Enclosure Suggestion: 4.0 cu. ft. | Displacement: TBA | Depth: 10.11 in | Outside Diameter: 18.66 in | Cutout: 16.69 in | Recommended Tuning: 32 Hz | Recommended Port Area: 64 sq. in..
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Sundown Audio U-15 D2 15" 1500W RMS Dual 2-Ohm U-Series Subwoofer

  • Sundown Audio U-15 D2 15" 1500W RMS Dual 2-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 3.8 Ω | Resonance Frequency (Fs): 37.9 Hz | Equivalent Volume (Vas): 54.0 L | Electrical Q Factor (Qes): 0.34 | Mechanical Q Factor (Qms): 3.10 | Total Q Factor (Qts): 0.31 | Voice Coil Inductance (Le): 2.44 mH | Force Factor (BL): 30.7 NA | Moving Mass (incl. Air Load) (Mms): 355.7 g | Suspension Compliance (Cms): 0.05 mm/N | Sensitivity: 91.2 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 2.0 cu. ft. | Ported Enclosure Suggestion: 3.0 cu. ft. | Displacement: 0.24 cu. ft. | Depth: 9.05 in | Outside Diameter: 15.59 in | Cutout: 14.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 48 sq. in..
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Sundown Audio U-15 D4 15" 1500W RMS Dual 4-Ohm U-Series Subwoofer

  • Sundown Audio U-15 D4 15" 1500W RMS Dual 4-Ohm U-Series Subwoofer.
  • Specifications: DC Resistance (Re): 6.1 Ω | Resonance Frequency (Fs): 34.9 Hz | Equivalent Volume (Vas): 63.9 L | Electrical Q Factor (Qes): 0.39 | Mechanical Q Factor (Qms): 3.48 | Total Q Factor (Qts): 0.35 | Voice Coil Inductance (Le): 3.80 mH | Force Factor (BL): 34.6 NA | Moving Mass (incl. Air Load) (Mms): 353.0 g | Suspension Compliance (Cms): 0.06 mm/N | Sensitivity: 90.2 dB 1w / 1m.
  • Box Recommendations: Sealed Enclosure Suggestion: 2.0 cu. ft. | Ported Enclosure Suggestion: 3.0 cu. ft. | Displacement: 0.24 cu. ft. | Depth: 9.05 in | Outside Diameter: 15.59 in | Cutout: 14.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 48 sq. in..
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(2) Memphis Audio MJP1244 12" 1500w MOJO Pro Car Audio Subwoofers DVC 4 ohm Subs

  • ...orting ring for reduced inductance. Foam surround. Rigid paper cone. Progressive spider. Diecast basket. Single Sided compression terminals. Size: 12 Inch. Voice coil: DUAL 4Ω. RMS/PEAK: 750/1500 Watts. SENS: 85.68 dB. DEPTH: 6.23 Inch. CUT OUT: 11.34 Inch.
  • Thiele Small Parameters: Resonant Frequency (fs): 36.7 Hz. Mechanical Q (Qms): 7.217. Electrical Q (Qes): 0.764. Total Q (Qts): 0.69. Sensitivity: 85.68 dB. Xmax Linear: 0.51 in. Displacement: 0.16 cf. Air Volume of Suspension (Vas): 1.09 cf. Moving Mass (Mms): 241.3 g. Suspension Compliance (Cms): 0.078 mmN. Effective Piston area (Sd): 530.93 SqCm. Motor Strength (Bl): 11.23 TM. DC Resistance: 1.73 Ohms.
  • Voice Coil & Magnet: Impedance Series: 8 ohms. Impedance Parallel: 2 ohms. Voice Coil Diameter: 2.5 in. RMS Power: 750 watts. Peak Power: 1500 watts. Magnet Weight: 120 oz. Magnet Diameter: 6.69 in. Physical Dimensions:. . Mounting Depth: 6.23 in. Cutout Diameter: 11.34 in. Frame Outside Diameter: 12.94 in.
  • Enclosure Recommendations: Single Sub Sealed: 1.5 cf. Dual Subs Sealed: 2.7 cf. Single Sub Vented: 2.5 cf. Port Dimensions: 5" x 5" x 27"L in. Tuning Frequency: 36 Hz. Dual Sub Vented: 4.6 cf. Port Dimensions: 7" x 6" x 23"L in. Tuning Frequency: 36.
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