Sundown Audio SLD-12 12" (30cm) Flat Subwoofer

Name: Sundown Audio SLD-12 12 inch Subwoofer | Masori
Brand: Sundown Audio
Price: 364.65 EUR
Availability: InStock

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Sundown Audio SLD-12 12" (30cm) Flat Subwoofer

RMS power: 600 watts, impedance: 3.65 ohms, sensitivity 88.1 dB.
2.5" voice coil former, 4-layer copper wire, 12mm Xmax.
Solid pole pieces, top plate with slots, magnetic short-circuit ring.
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Impedance: D4 (2x4 Ohm)

D2 (2x2 Ohm)
D4 (2x4 Ohm)

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SLD-12 by Sundown Audio

The Sundown Audio SLD series, which includes the SLD-12 12-inch shallow subwoofer, can be considered a "reboot" of the SD-2 line from 2011. The SD-2 was essentially a "shallow SA v1"—that is, it had the same cone, surround, and spider as the SA, but a shorter motor with a shorter coil. Starting with the 3rd generation (SD-3), the SD series took a different direction—more towards SQ and sealed enclosures (this also applies to the SD-4 series). Due to high demand, we launched the SLD series to bring back a highly abuse-tolerant "shallow" series that works well with open enclosures!

Similar to the current SD-4 series, we have used solid pole pieces, so the SLD can also be mounted directly on the rear enclosure wall to reduce the required net depth. Compared to the old SD-2, we have introduced numerous important upgrades: pole piece channels for reduced air noise and improved cooling, top plate "slots" for better cooling and less distortion, as well as a magnet ID shorting ring. Regarding long-term reliability, we have also screwed the tooth ring, assembled the motor with screws, screwed on the aluminum pole cap, and added "Mini-XL" lead wires to ensure flawless operation for many years.

Features

Xmax = 12 mm in one direction at 70% BL
Xmech is a hard limit of 25 mm in one direction (more than double Xmax is a very generous limit)
RMS power = 600 watts
2.5-inch black aluminum voice coil former for excellent heat dissipation
High-temperature 4-layer copper voice coil wire
Sewn-on "Mini-XL" lamellar cables to prevent fatigue and failure
Solid poles with high-speed ventilation channels milled around the OD
Ventilated, EMD-cut top plate design
Screwed motor construction for maximum durability and resistance to mechanical failures
This motor is screwed from the top, so the screws are not visible from the back like on some other models.
Magnet ID shorting ring

Technical Data

T/S SPECS SLD 12" D2

RE (Ohm) 3.65
FS (Hz) 42.959
VAS (L) 26.889
Qes 0.691
Qms 2.227
Qts 0.415
Le (mH)
BL (NA) 19.868
Mms (grams) 204.319
Cms (uM/N) 67.177
Sensitivity (dB @ 1w/1m) 88.1

T/S SPECS SLD 12" D4

RE (Ohm) 6.85
FS (Hz) 45.142
VAS (L) 29.481
Qes 0.619
Qms 2.298
Qts 0.487
Le (mH)
BL (NA) 23.025
Mms (grams) 168.773
Cms (uM/N) 73.652
Sensitivity (dB @ 1w/1m) 88.3

Sealed enclosure 28 liters
Ported enclosure 42 liters
Recommended tuning 35Hz
Recommended port area 170cm²
Depth 13.8cm
Outer diameter 31.9cm
Cutout 28.2cm

Frequent questions about SLD-12

Welche technischen Merkmale hat der Sundown Audio SLD-12 Subwoofer?

The Sundown Audio SLD-12 subwoofer is a flat 12-inch subwoofer with an RMS power of 600 watts. It features a 2.5-inch voice coil made of black aluminum for excellent heat dissipation. The high-temperature resistant 4-layer copper voice coil ensures stability even under heavy load. Sewn 'Mini-XL' lead wires prevent fatigue and failure. The solid pole piece design with machined high-speed ventilation channels and the EMD-cut top plate design enhance cooling and reduce distortion. The bolted motor construction increases durability. The magnet ID shorting ring is another technical highlight of the SLD-12's design.

Welche Thiele-Small-Parameter hat der SLD-12 Subwoofer?

The Thiele-Small parameters of the SLD-12 subwoofer vary depending on the D2 or D4 version. For the 12" D2 version, the parameters are: RE 3.65 Ohm, FS 42.959 Hz, VAS 26.889 liters, Qes 0.691, Qms 2.227, Qts 0.415, Le 1.56 mH, BL 19.868 NA, Mms 204.319 grams, Cms 67.177 uM/N, and a sensitivity of 88.1 dB at 1W/1m. The 12" D4 version, on the other hand, has: RE 6.85 Ohm, FS 45.142 Hz, VAS 29.481 liters, Qes 0.619, Qms 2.298, Qts 0.487, Le 1.90 mH, BL 23.025 NA, Mms 168.773 grams, Cms 73.652 uM/N, and a sensitivity of 88.3 dB at 1W/1m.

Wie groß muss das Gehäuse für den Sundown Audio SLD-12 sein?

For optimal operation of the Sundown Audio SLD-12 flat subwoofer, a cabinet volume of 28 liters is recommended for a sealed enclosure. In a bass reflex enclosure, the volume increases to 42 liters, which helps to emphasize the low frequencies more effectively. The recommended tuning frequency for a vented enclosure is 35 Hz. For vented enclosures, a port area of 170 cm² should be maintained to ensure optimal airflow and bass performance. These specifications provide a flexible solution for integrating the subwoofer into various systems while fully utilizing its performance.

Welche Tipps zur Installation des Sundown Audio SLD-12 Subwoofers gibt es?

When installing the Sundown Audio SLD-12 subwoofer, you should consider a minimum installation depth of 13.8 cm. The outer diameter is 31.9 cm, and the cutout should measure 28.2 cm. The bolted motor construction allows for easy and stable mounting, with the screws inserted from above and thus not visible. Also, note that the complete assembly and solid construction of the SLD-12 allow for direct mounting close to the rear wall of the enclosure to save space and reduce net depth.

Mit welchen Fahrzeugmodellen ist der SLD-12 kompatibel?

The Sundown Audio SLD-12 is a 12-inch flat subwoofer that can be integrated into many vehicle types due to its shallow depth and flexible installation options, provided there is enough space for a 12-inch subwoofer enclosure. The SLD-12 is particularly suitable for vehicles that have limited space but still require powerful bass reproduction. Since no specific car brands are mentioned, you should consider the measurements to ensure that the subwoofer fits the respective vehicle model. If in doubt, it is advisable to compare the installation specifications with the vehicle details.

Welche Materialien werden im Sundown Audio SLD-12 verwendet?

The Sundown Audio SLD-12 uses black aluminum for the voice coil carrier, which ensures excellent heat dissipation and, together with the high-temperature 4-layer copper wire, provides high thermal resilience. The motor of the subwoofer is solidly constructed with top-mounted components for a stable and durable design. Additionally, sewn 'Mini-XL' ribbon cables are integrated to protect the connectors from fatigue and prevent failures. The solid construction and careful selection of materials make the SLD-12 subwoofer robust and durable, even under intense use.

Wie verhält sich der Sundown Audio SLD-12 im Hinblick auf Schallleistung und Empfindlichkeit?

The Sundown Audio SLD-12 subwoofer offers impressive sound performance with a sensitivity of 88.1 dB at 1 W/1 m in the D2 version and 88.3 dB in the D4 version. These high sensitivity values ensure efficient sound pressure, even at low amplifier power, which is particularly advantageous when the SLD-12 is integrated into powerful sound systems. The Xmax is 12 mm in one direction, contributing to clean bass performance even at high volumes. Its maximum sound output can also be fully utilized in more extreme systems under mechanical stress, thanks to the robust construction and innovative cooling techniques.

Was sind die Unterschiede zwischen dem SLD-12 und älteren SD-2-Modellen?

Compared to the older SD-2 line, the Sundown Audio SLD-12 has been equipped with numerous improvements. One of the most significant differences is the new pole piece channels, which reduce air noise and improve the cooling of the subwoofer. The top plate "slots" reduce distortion and increase cooling performance. The magnet ID short circuit ring optimizes the electromagnetic properties. Furthermore, the tooth ring has been bolted to increase durability. The motor is also bolted, and the aluminum pole cap is screwed on, which significantly improves resistance to mechanical failures and thus increases the reliability of the subwoofer.

Welche Vorteile bietet der neue Motor des SLD-12?

The motor of the Sundown Audio SLD-12 subwoofer has been extensively revised to ensure maximum durability and resistance to mechanical failures. One of the key improvements is the solid construction and bolted design, which allow for enhanced stability and smooth assembly. The components bolted on top ensure that all mechanical fastenings are robust and that the installation remains clean. This design, combined with a magnet ID short-circuit ring, provides low power loss with excellent sound quality. These improvements ensure sustainable and reliable operation even under extreme operating conditions.

Wodurch wird die Wärmeableitung des SLD-12 optimiert?

The heat dissipation of the Sundown Audio SLD-12 subwoofer is enhanced by several technical features. The 2.5-inch voice coil former is made of black aluminum, known for its excellent heat dissipation properties. The 4-layer copper voice coil with high-temperature resistance also contributes to efficiently dissipating heat. The vented structure with machined high-speed ventilation channels and the EMD-cut top plate design promote air circulation and drastically reduce heat buildup. These measures ensure that the subwoofer operates efficiently and reliably even under intense use and heavy thermal stress.

Herstellerinformation/verantwortliche Person

JR Labs
Rainer Jakob
Heinrich-Hertz-Straße 13 A
46325 Borken
Germany

Contact: jakobrainer@jr-labs.eu

Let customers speak for us

from 9059 reviews

Jean François Tedesco

Alpine tube 12 bazooka , Un sacré caisson de basses ,

Un sacré caisson de basses , j'ai eu un 46 cm killer 454 de l'époque année 90 , qui tapait vraiment bien , mais ce tube est bien plus fort et plus ample, toutes les basses passent sans problème, avec une télécommande à réglage multiples taramps eq bass , et un ampli Machete de masori , le couple est parfait, personnellement j'en ai deux tubes et ça donne énormément, avec l'ampli 2 x 530 en 4 ohms . Parfois le plus simple est bien meilleur et plus durable .

SWT-12S4

11/29/2025

Bartosz Erber

X-10 v3 d2

Hallo. Sehr freundlicher Kundenservice und schnelle Auftragsabwicklung. Der Lautsprecher ist brandneu und unbenutzt. Ich habe ihn vor einiger Zeit gekauft, aber erst kürzlich das Gehäuse fertiggestellt. Die Parameter entsprechen den Herstellerangaben: 42,5 Liter Nettovolumen, abgestimmt auf 32 Hz und 21 mm starkes Sperrholz. Ich hatte noch nie einen 10-Zoll-Lautsprecher und wusste nicht, was mich erwartet, aber das Ergebnis hat meine kühnsten Erwartungen übertroffen. Der Bass aus einem so kleinen Lautsprecher in einem so kleinen Gehäuse ist einfach unglaublich. Um den X-10 zu kaufen, habe ich meinen DD 712f in einem 70-Liter-Gehäuse verkauft, und der war ein Volltreffer. Der Sundown ist in jeder Hinsicht besser. Ich kann diesen Lautsprecher und den Händler, bei dem ich ihn gekauft habe, wärmstens empfehlen. Beste Grüße.

X10 v3

11/18/2025

tatazz

Est arrivé à la maison très rapidement

Est arrivé à la maison très rapidement 👌🏽

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11/13/2025

Anonym

.

Geht echt gut und leicht zum einstellen

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11/12/2025

Georges, Alexander, Vainohoarii NAGLE

Très satisfaisant.

Bonjour, je reçu le colis bien emballé.
Je recommande vivement, la livraison est gratuite et rapide, je recommanderai sûrement encore chez Masori.

RS-YS12

11/10/2025

SPYRIDON D.

Bought again

Bought again. Great price, fast delivery, nice !

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Perfect sound, I bough 2 pairs for the door and

Perfect sound, I bough 2 pairs for the door and the difference between these and the stock ones are huge

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Deaf bonce

Très bonne qualité
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Preis/Leistung Qualität top!

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Top Upgrade für Canton System

Ich habe den Woofer in meinem Skoda Octavia 3 mit Canton Soundsystem eingebaut.
Der Einbau war Plug & Play, alles passt perfekt ohne Anpassungen.
Im Vergleich zum originalen Canton Subwoofer spielt dieser deutlich stärker, präziser und mit mehr Druck.
Ich kann den Woofer jedem empfehlen, der mehr Bass aus dem Canton-System herausholen möchte – lohnt sich absolut!

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