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Description

Sundown Audio SML-12 D2

The Sundown Audio SML-12 D2 is a 12-inch shallow-mount subwoofer designed to deliver deep, controlled bass in compact installations where full-depth subs cannot fit. The dual 2-ohm voice coil (D2) configuration allows flexible wiring to 1 Ω or 4 Ω, making it compatible with a variety of amplifiers. Built with Sundown’s shallow-series technology, it features a vented magnetic gap, vented pole piece, high-temperature copper voice coil, stitched “Mini-XL” tinsel leads, and reinforced suspension, ensuring reliable performance and strong low-end output even in small sealed or stealth enclosures. Ideal for behind-seat, under-seat, or other tight-fit custom installations.


Specifications

T/S Specs
RMS Power (D4)
600
RMS Power (D2)
600
Peak Power (D2)
1200
Peak Power (D4)
1200
VAS D2 (L)
39.012
VAS D4 (L)
29.593
Qes D2
0.456
Qes D4
0.617
Qms D2
2.862
Qms D4
3.035
Qts D2
0.394
Qts D4
0.513
BL D2 (NA)
17.879
BL D4 (NA)
22.801
Mms D2 (Grams)
182.067
Mms D4 (Grams)
186.887
Cms D2 (uM/N)
114.018
Cms D4 (uM/N)
85.771
Sens D2 (dB @ 1w/1m)
87.5
Sens D4 (dB @ 1w/1m)
86.7
Xmax D2
11mm
Xmax D4
11mm
Subwoofer Measurements
Product Sku
SML-12 
Displacement (Inches)
.05cu ft
Depth (Inches)
4.45
Cutout (Inches)
10.75″
Motor Diameter (Inches)
6.14
Ported Enclosure Specs
Ported Enclosure Size
1.25-1.75 cu ft
Recommended Port Area
26-30 sq in
Recommended Port Tuning
35hz
Sealed Enclosure Specs
Sealed Enclosure Size
0.75-1.0 cu ft
4th Order Enclosure Specs
4th Order Sealed Side
0.75 cu ft
4th Order Ported Side
2.25cu ft
4th Order Port Area
15sq in
4th Order Port Length
6″

 


Specifications

RE (Ohms) 3.650 6.850
FS (Hz) 34.932 39.905
VAS (L) 39.012 29.593
Qes 0.456 0.617
Qms 2.862 3.035
Qts 0.394 0.513
BL (NA) 17.879 22.801
Mms (Grams) 182.067 186.887
Cms (uM/N) 114.018 85.771
Sens (dB @ 1w/1m) 87.5dB 86.7dB
Xmax 14mm 14mm
T/S SPECS SML 12″ D2 SML 12″ D4

Enclosure Specifications
SML 10″ SML 12″
Sealed Enclosure 0.5-0.75 ft^3 0.75-1.0 ft^3
Ported Enclosure 1.0-1.25 ft^3 1.25-1.75 ft^3
Recommended Tuning 35hz 35hz
Recommended Port Area  26-30 sq in  26-30 sq in
Mounting Depth 3.78” 4.45”

 


About The Product

Introducing the SML series: a revolutionary line of subwoofers by Sundown Audio. This series is an inch shallower than the SLD line, yet delivers nearly the same excursion, making it the ultimate choice for customers in search of an extremely shallow driver with deep bass. Specifically designed to fit under or behind your seat, the SML series excels in performance, especially within small enclosures.

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Questions and Answers

Q1: What is the power handling of the SML-12 D2?

A1: Typically rated around ~500W RMS with strong peak capability depending on enclosure design.

Q2: What does “D2” stand for?

A2: “D2” indicates the subwoofer has dual 2-ohm voice coils, allowing wiring to 1 Ω (parallel) or 4 Ω (series).

Q3: Can the SML-12 D2 fit in tight spaces?

A3: Yes  its shallow-mount design allows installation behind seats, under seats, or in compact stealth enclosures.

Q4: What features improve cooling and durability?

A4: It includes a vented pole piece and gap, high-temp copper voice coil, stitched tinsel leads, and reinforced suspension and surround for reliability under high power.

Q5: Which enclosure works best for this subwoofer?

A5: Best performance is achieved in a small sealed enclosure, optimized for clean, tight bass in limited spaces.


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