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SA Series


The SA line was designed to be the centerpiece of the Sundown Audio subwoofer lineup -- the line to which all of our other lines are compared. We started with an FEA optimized motor design capable of 19mm of one-way Klippel verified excursion and significantly more x-mech (maximum mechanical excursion). This motor was mated to a top quality double layer nomex spider, an SPL competition grade paper cone, and a strong foam surround capable of handling the excursion and force generated by the motor structure. The motor also features dual faraday rings (shorting rings) to reduce inductive distortion. At Sundown Audio this still was not enough so we designed a highly optimized voice coil cooling system that ensures that an SA series woofer will never over-heat when used anywhere close to it's rated power level. This system allows our 2.5" coil to match and exceed the thermal performance of many 3" coil drivers on the market today. This same voice coil cooling system has been applied to all of our larger woofers lines as well due to it's proven effectiveness over the years in the SA series.

All of this hard work and engineering has lead to the incredible reputation now enjoyed by the SA series worldwide. We are very proud of what these woofers are capable of and we believe that they are one of the best woofers on the market today in their price and power range.

Xmax = 19mm one-way by 70% BL
RMS Power = 600-watts

SA-8 v.2

The SA-8 v.2 represents the pinnacle of low distortion, ported box 8 inch subwoofer technology. Every piece of the SA-8 v.2 has been custom tooled with the utmost performance and lowest distortion in mind. We started with a proprietary FEA optimized motor design made just for the SA-8 v.2 which features double farady rings just like it's bigger brothers. This motor is mated to a custom tooled and patented (US Patent D691595) frame which allows for a larger spider and superior clearances to nearly any other 8" woofer on the market today. The spider itself was custom tooled to achieve a very even compliance curve and also features double, tied down tinsel leads to handle incredible amounts of power. The SA-8 v.2 also features a full 16mm of Klippel verified one-way linear excursion and mechanical capacity in excess of double the linear limits to ensure that mechanical failures are nearly impossible at any reasonable power level.

The SA-8 v.2 takes a departure from it's larger cone diameter siblings in terms of the voice coil ventilation. We still use our "trademark" vented spacer ring but the SA-8 v.2 features a solid pole piece to allow the maximum level of magnetic flux to pass through it. As the SA-8 v.2 uses a 2" coil there is less steel in the pole than with a larger diameter coil so we preserved all of it. We still took great care to fully test and optimize the ventilation in the SA-8 v.2 to ensure thermal reliability even under the most punishing conditions. As with our SD-2 series the solid pole also allows mounting directly against or very close to the enclosure back-wall; thus reducing the effective depth requirement of the woofer. As the SA-8 v.2 is already very deep for an 8" woofer this is a very important feature when presented with tight mounting requirements.

The standard SA-8 v.2 features a 4-layer copper voice coil for the most possible low-end extension. We do offer SPL models with lighter coils and even "extreme SPL" models with harder spider packs and other impedance configurations (these must be custom built). We can use anywhere from 2 to 6 spider layers on SPL versions to tailor the FS where it needs to be for a given SPL application.

Xmax = 16mm one-way by 70% BL
RMS Power = 500-watts
  • Specifications SA 8v2 D2 SA 8v2 D4 SA‐10D2 SA‐10D4 SA‐12D2 SA‐12D4 SA‐15D2 SA‐15D4 SA‐18D2 SA‐18D4
    RE (ohms) 3.36 5.76 4.29 7.08 4.57 7.07 4.61 7.75 4.0 7.0
    FS (Hz) 34.6 35.95 35.4 36.6 33.71 33.96 34.88 36.95 32.4 33.1
    Vas (L) 7.44 7.25 10.13 10.66 21.21 24.63 54.69 52.35 109.1 106.7
    Qes 0.35 0.411 0.52 0.54 0.58 0.55 0.72 0.85 0.63 0.70
    Qms 10.10 5.97 5.41 5.30 5.34 5.15 6.52 6.63 5.97 5.65
    Qts 0.33 0.385 0.48 0.49 0.52 0.49 0.65 0.75 0.57 0.63
    Le (mH) 2.03 2.69 3.41 4.71 3.40 4.84 3.39 4.98 2.35 3.32
    BL (NA) 17.56 21.05 20.40 24.82 21.64 25.67 21.76 25.87 23.9 29.9
    Mms (Grams) 156 140 230 205 280 237 338 315 440.7 433.8
    Cms (uM/N) 140 140 87.8 92.4 79.43 92.27 61.42 58.8 50.00 50.00
    Sens (1w/1m) 81.5 81.16 81.0 81.6 83.21 84.22 86.81 86.68 89.6 89.2
  • SA 8

    SA 10

    SA 12

    SA 15

    SA 18

    Sealed 0.28 ft^3 0.5 ft^3 1.0 ft^3 2.5 ft^3  
    Ported 0.5-0.75 ft^3 @ 35hz 1.0-1.25 ft^3 @ 35hz 1.5-2.0 ft^3 @ 35hz 3.0-4.0 ft^3 @ 35hz  
    Displacement 0.08 ft^3 0.10 ft^3 0.14 ft^3 0.17 ft^3  
    Depth 6 5/8" 6" 6 1/2" 7 1/2"  
    Outside Diameter 8 3/8" 10 1/2" 12 5/8" 15 5/8"  
    Cut-Out 7 3/8" 9 1/4" 11 1/8" 14 1/8"