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Ships within 48 hours · Estimated delivery Aug 5 - Aug 10
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Description
SounDigital - 400.4 XPAt the pinnacle of performance and innovation, we proudly present the XP linean impressive evolution in your audio experience. Designed with state of the art technology and enhanced by artificial intelligence, XP amplifiers embody the core DNA of SounDigital innovation, excellence, and precision. The XP line delivers exceptional audio performance, combining advanced engineering with superior components to ensure reliability and remarkably faithful
At the pinnacle of performance and innovation, we proudly present the XP line—an impressive evolution in your audio experience. Designed with state-of-the-art technology and enhanced by artificial intelligence, XP amplifiers embody the core DNA of SounDigital innovation, excellence, and precision.
The XP line delivers exceptional audio performance, combining advanced engineering with superior components to ensure reliability and remarkably faithful sound clarity. Its compact and versatile design allows seamless integration into a wide range of applications, meeting diverse needs with efficiency and practicality.
Whether you’re an audiophile or a casual listener, XP amplifiers elevate your audio experience, striking the perfect balance between cutting-edge technology and exceptional quality. With the XP line, hear sound as it was meant to be heard.
SD 400.4 XP – 4Ω
Power @ 4Ω: 4 X 66 WRMS
Power @ 2Ω: 4 X 100 WRMS
Power @ 1Ω: N/A
Bridge Power @ 8Ω: 2 X 132 WRMS
Bridge Power @ 4Ω: 2 X 200 WRMS
Bridge Power @ 2Ω: N/A
Operating Voltage: 9V – 16V
Current Draw (Music): 17 A
Current Draw (Max): 34 A
Recommended Fuse (Music): 20 A
Frequency Response (-3dB): 5Hz – 36kHz
SNR: 96dB
Crossover HPF: 45Hz – 850Hz
Crossover LPF: 45Hz – 850Hz
THD + N (10% Rated Power): 0.1%
Recommended Battery: 40aH
Power Cable: 7AWG
Speaker Cable: 15AWG
Product Dimensions: 4.69 x 4.44 x 2.0 in
Product Dimensions: 11.9 x 11.3 x 5.0 cm
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Very good quality for a reasonable price.
Size: 10, Color: Grey
Very good quality, very soft, very comfortable, look amazing, I’m very happy.
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Reviewed in the United States on May 23, 2026
★★★★★ 4
Comfortable fit for slip-in fabric shoes
Size: 14, Color: Black/Black
My first experience with Marc Joseph. I typically purchase dress and casual work shoes from Florsheim and occasionally Rockport. I'm giving these four stars because the initial fit and feel appear solid. Depending on the shoe brand I wear a size 14 or 15. My feet are slightly wide but I don't alway need wide fit. These size 14 fit well with wide enough toe box. I've tried slip in shoes before and they just don't feel right. These somehow work and there is no heel slip. My only reservation is the high lip on the heel for slip-in and hope they dont catch pant hems. I gave 4 stars because I'll have to determine durability. Granted they are a light fabric shoe with a soft rubber tread. I'd like them to last for at least 6 months..and use them for business casual work wear during warm weather.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Stylish and comfortable.
Size: 8 Wide, Color: Black/Black
Shoes look great and fits well. Definitely recommend pocking another pair.
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Reviewed in the United States on May 10, 2026
★★★★★ 3
Narrow for an 11.5W
Size: 11.5 Wide, Color: Navy
Nice look and material but very narrow for a wide, had to return
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Reviewed in the United States on February 25, 2026
★★★★★ 5
NIce Shoes
Size: 10, Color: Black
Very nice quality and comfort
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Reviewed in the United States on June 1, 2026