3. U-6.5SW v1

U-6.5SW v1

1 review

400 Watt

U-6.5SW v1

1 review

Technical Highlights

  • 400 Watt RMS power, dual voice coils with 2/4 Ohm.
  • Aluminum voice coil former, 1.75 inch, cooling efficient.
  • FS at 41.95/38.69 Hz, bass reflex optimization, cast basket.
  • More technical details
€279.00
€279.00 €279.00
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ProductU-6.5SW v1 · D2 (2x2 Ohm)

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Impedance: D2 (2x2 Ohm)
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Sundown Audio-U-6.5SW v1-6.5" (16,5cm) Subwoofer-masori-kaufen
€279.00
€279.00 €279.00

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The U-6.5SW v1 from Sundown Audio is a 6.5-inch subwoofer designed for an intense sound experience. With an RMS power of 400 watts, it delivers powerful bass. The dual voice coils are available in 2 or 4-ohm variants, providing versatile application options. An aluminum voice coil former ensures efficient heat dissipation, while the high-temperature copper voice coil with double-stitched surround increases durability. This subwoofer is optimized for small enclosures with a bass reflex port and features a highly durable cast basket. Practical spring terminals and cooling channels in the top plate complete the equipment.

Features

  • RMS 400 Watt
  • Double swing coils with 2 or 4 ohms
  • Optimized for small enclosures with bass reflex port
  • 1.75-inch swing coil former made of aluminum for excellent heat dissipation
  • Swinging coil made of high-temperature copper
  • Double stitched seam
  • High-load cast basket
  • Spring clamps for cables up to 4mm²
  • Rear gap ventilation
  • Cooling channels in the upper plate

Parameter

RE (Ohms) D2
4.0586		 D4
6.6274
FS (Hz) 41.9533 38.6925
VAS (L) 2.9053 3.7701
Qes 0.5238 0.5005
Qms 8.5834 7.2470
Qts 0.4937 0.4681
The (mH) 4.0112 5.5892
BL (NA) 16.7428 20.0082
Mms (Grams) 137.2546 124.3518
Cms (uM/N) 104.8528 136.0613
Sensitivity (dB @ 1w/1m) 77.8706 78.1460
Xmax 19mm 19mm

Immediately available 6.5" (16,5cm) Subwoofer

    Frequently Asked Questions about U-6.5SW v1

    How does the RMS power of 400 watts affect the sound experience of the U-6.5SW v1 Subwoofer?

    The RMS power of the U-6.5SW v1 Subwoofer from Sundown Audio is 400 watts, which provides powerful and dynamic bass. This means that the subwoofer can deliver 400 watts of continuous power without distortion or overheating. A high RMS value like this is crucial for reproducing low frequencies, especially in an environment where you appreciate loud and precise music. It harmonizes ideally with the low damping in small enclosures for which this subwoofer is optimized. The high performance allows for clean bass even at higher volumes.

    What advantages do the dual voice coils with 2 or 4 Ohm offer in the Sundown Audio U-6.5SW v1?

    The U-6.5SW v1 is equipped with dual voice coils in 2 or 4 Ohm variants, allowing you flexible adaptation to your audio system. You can choose between parallel or series wiring to optimize the overall impedance and efficiently utilize your amplifier's power. This adaptability ensures that the subwoofer can integrate into different audio setups and distribute the electrical load optimally. Especially if your amplifier is adjustable in Ohm value, these coils provide you the necessary freedom to ensure maximum sound quality.

    What role does the 1.75-inch aluminum voice coil former play in this subwoofer?

    The 1.75-inch aluminum voice coil former of the U-6.5SW v1 significantly supports the heat dissipation of this subwoofer. Aluminum is known for its excellent thermal conductivity, which means that the heat generated by the movements and current flow of the voice coil is efficiently dissipated. This prevents overheating of the coil and ensures consistent performance even under intense operation. Effective heat dissipation directly contributes to the longevity and stability of the subwoofer by reducing thermal compressions that could impair sound quality.

    What technical details are relevant for the cast basket of the Sundown Audio U-6.5SW v1?

    The cast basket of the U-6.5SW v1 subwoofer is characterized by its high load capacity and stability. Cast baskets offer better resistance to mechanical deformations and vibrations compared to stamped metal baskets. This is particularly important for the reproduction of low frequencies, as the body sound must remain stable to avoid impairing the precision of sound reproduction. Additionally, the cast basket contributes to more efficient assembly and better protection of the internal components, ensuring that the system operates reliably even under intense conditions.

    Which Thiele-Small parameters of the U-6.5SW v1 subwoofer are particularly noteworthy?

    Particularly noteworthy for the U-6.5SW v1 are the Thiele-Small parameters such as FS (41.9533 Hz at D2 and 38.6925 Hz at D4), the VAS values (2.9053 L at D2 and 3.7701 L at D4), and the Qts values (0.4937 at D2 and 0.4681 at D4). The FS value indicates the resonance frequency, determined by the diaphragm mass and the surround stiffness. The VAS value indicates the equivalent air volume that has a similar spring force as the driver, while Qts describes the oscillation behavior and damping of the subwoofer. These parameters are crucial for cabinet design and tuning behavior in the car.

    What role do the cooling channels in the top plate play in the performance of the subwoofer?

    The cooling channels in the top plate of the U-6.5SW v1 are crucial for the thermal stability of the subwoofer. They allow for a constant airflow that dissipates the heat generated by the voice coils. These channels ensure that the temperature control of the voice coils remains efficient, especially under high load and usage, which increases operational safety and reduces the risk of thermal compression. Additionally, they maintain sound quality by mitigating temperature spikes that could lead to distorted sound. This is particularly important when consistently high sound pressure is required.

    How are the spring terminals for wiring best utilized?

    The spring terminals of the U-6.5SW v1 are designed to securely fix cables up to 4mm². These clamps provide a solid and vibration-free connection, which is important for minimizing signal loss. They are user-friendly and allow for easy and secure installation of the wiring without additional tools. This not only ensures stable operation but also facilitates any changes or adjustments to the wiring. Especially when you frequently change the system settings or try to find the optimal conditions for your listening enjoyment, these connections prove to be practical.

    What function does the rear slot ventilation have?

    The rear slot ventilation of the U-6.5SW v1 is crucial for the thermodynamics and performance of the Subwoofer. This ventilation ensures improved airflow around the voice coil, which prevents the Subwoofer from overheating and contributes to cooling. Continuous air circulation allows the Subwoofer to operate optimally and increases its overall lifespan. Effective heat management is particularly important at high power levels to minimize thermal compression that could distort the sound. Especially at concerts or consistently high volumes, this ensures clear bass without loss of power.

    What are tips for optimal enclosure selection for the Sundown Audio U-6.5SW v1?

    The Sundown Audio U-6.5SW v1 is specifically optimized for use in small enclosures with a bass reflex opening. This design ensures that the bass foundation is fully realized even in limited space. When building or purchasing an enclosure, you should pay attention to precise volume specifications and correctly tuned bass reflex channels to achieve maximum performance and sound quality. Careful consideration of volumetric requirements and frequency tuning will allow you to achieve the best listening experience by ensuring the mechanical reliability of the speaker and maximizing dynamic headroom.

    How is the sensitivity of the Subwoofer defined and what does a value of 77.8706 dB mean?

    The sensitivity of a speaker, in the case of the U-6.5SW v1, is 77.8706 dB at 1 Watt/1 meter. This value provides clarity regarding how efficiently the Subwoofer can produce sound pressure from a given electrical input power. Such a sensitivity value indicates that the Subwoofer is designed for operation with powerful amplifiers to produce high sound pressure levels. Low sensitivity values typically require more power to reach a certain volume level. This feature is important for users who need low-frequency, high-output performance, especially in larger installations or at peak levels where high sound pressure is desired.

    Manufacturer information/responsible person

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

    Contact: jakobrainer@jr-labs.eu

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