MOSCONI AS100.4S Ab Amplifier 4-CHANNEL 100W AS-100.4S

( Brand: Mosconi ), ( Manufacturer Part Number: AS100.4S ), ( Model: AS100.4S SILVER ), ( Part Type: Amplifier ), ( Rms Power: 400w ), ( Country Of Origin: Italy )

Review MOSCONI As-100.4s 4-channel Rms Class Ab Amplifier

The **MOSCONI AS-100.4S** is a high-performance, four-channel audio amplifier designed for audiophiles, home theater enthusiasts, and professional sound engineers who demand precision, power, and versatility in their listening experience. Part of MOSCONI s acclaimed **AS Series**, this amplifier is engineered to deliver exceptional clarity, dynamic range, and musicality while maintaining an elegant and compact form factor. With a robust **100 watts per channel** of continuous output power into 8 ohms (20Hz 20kHz, 0.05% THD), the AS-100.4S ensures powerful yet clean amplification, whether driving high-efficiency speakers, impedance-sensitive loads, or even low-impedance headphones through its optional **headphone output**. Its symmetrical **AB (push-pull) topology** architecture, featuring complementary MOSFET and bipolar transistor output stages, delivers outstanding linearity, minimal distortion, and superior transient response, allowing for a detailed and immersive soundstage that brings every nuance of music and dialogue to life.

The amplifier s **fully discrete design** eliminates the artifacts often associated with integrated circuits, resulting in a sound that is both natural and engaging, with a rich harmonic structure and an expansive frequency response. MOSCONI has meticulously optimized the AS-100.4S s **power supply and filtering** to minimize noise and ripple, ensuring a stable and clean power delivery that enhances the integrity of the audio signal. The inclusion of **high-quality capacitors** and **low-inductance wiring** further contributes to its ability to handle demanding audio sources, from analog vinyl turntables to high-resolution digital files, without compromising dynamic range or tonal balance. The amplifier s **balanced XLR inputs** (with optional unbalanced RCA inputs) provide flexibility for connecting a wide range of sources, including preamplifiers, DACs, and turntables, while its **separate volume control per channel** allows for precise matching of speaker impedance and gain settings, ensuring optimal performance regardless of the load.

Beyond its technical prowess, the AS-100.4S is built with **high-grade materials and robust construction**, featuring a sturdy **metal chassis** that not only enhances durability but also contributes to superior heat dissipation, allowing for sustained performance without overheating. The amplifier s **front-panel controls** are thoughtfully placed for easy access, with **LED power and standby indicators**, **channel-specific volume knobs**, and **input selection switches** that maintain a clean, uncluttered aesthetic. MOSCONI has also incorporated **user-friendly features** such as **protection circuits** against short circuits, overloads, and excessive voltage, ensuring long-term reliability while maintaining the integrity of the audio signal. Whether used as a standalone amplifier or integrated into a larger audio system, the AS-100.4S excels in delivering a **cinematic, three-dimensional sound experience** that transcends the limitations of conventional amplification, making it an ideal choice for audiophiles who refuse to compromise on sound quality.

For those seeking a balance between performance and space efficiency, the AS-100.4S s **compact yet professional-grade design** makes it an excellent fit for home theater setups, studio monitoring, or high-end stereo installations where aesthetics and functionality must coexist. Its **modular and upgradeable nature** also allows for future expansions, such as the addition of a **subwoofer output** or **digital signal processing**, ensuring that the amplifier can evolve alongside the user s audio needs. With MOSCONI s reputation for **innovative engineering and sonic excellence**, the AS-100.4S stands as a testament to the brand s commitment to delivering an amplifier that not only meets but exceeds the expectations of discerning listeners, offering a blend of **power, precision, and musicality** that elevates every listening session to new heights.

The **Mosconi AS-100.4S** is a 4-channel, 100W per channel active crossover amplifier designed for high-end audio systems, particularly in home theater and high-fidelity applications. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Mosconi AS-100.4S**

1. **High Power Output (100W per Channel)**

- Delivers clean, reliable power (100W into 8 ohms, 20Hz 20kHz) suitable for demanding speakers, including high-efficiency models or larger enclosures. This ensures minimal distortion and sufficient headroom for dynamic music or dialogue in home theater.

2. **Active Crossover Design**

- Built-in digital or analog crossover (depending on model variant) allows precise frequency splitting between speakers (e.g., separating woofer and tweeter signals). This reduces cable clutter and improves system organization, especially in multi-channel setups.

3. **High-Quality Components**

- Uses Class-D amplification with efficient power conversion, reducing heat and improving reliability. The circuitry is designed for low distortion and high dynamic range, appealing to audiophiles who prioritize sound fidelity.

4. **Compact and Modular**

- The 4-channel design fits well in home theater systems where multiple amplifiers are needed (e.g., for front left/right, rear left/right, or subwoofer satellite speakers). The compact form factor saves space compared to rack-mounted units.

5. **Balanced Outputs**

- Features balanced XLR outputs, which reduce noise and improve signal integrity, especially over long cable runs. This is beneficial for high-end speaker systems where signal purity is critical.

6. **User-Friendly Controls**

- Includes volume controls for each channel, phase inversion switches, and often a built-in test tone generator. The interface is straightforward, making it accessible for both beginners and experienced users.

7. **Reliability and Build Quality**

- Mosconi is known for durable construction and long-term performance. The AS-100.4S is built to handle continuous use without overheating, though proper ventilation is still recommended.

8. **Compatibility with High-End Audio**

- Works well with premium audio components, including DACs, preamps, and high-resolution sources (e.g., HDMI ARC, optical, or analog inputs). This makes it a versatile choice for audiophiles and home theater enthusiasts.

9. **Low Noise Floor**

- Class-D amplifiers like this one typically produce minimal background noise, ensuring a clean audio signal even at low volumes.

10. **Warranty and Support**

- Mosconi offers a standard warranty (usually 2 5 years), and their customer support is generally reliable for troubleshooting or replacements.

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### **Cons of the Mosconi AS-100.4S**

1. **Class-D Amplification Trade-offs**

- While efficient, Class-D amplifiers can produce slight harmonic distortion or "switching noise" at very low volumes or with certain types of music (e.g., acoustic guitar or piano). This is usually inaudible in most listening conditions but may bother purists.

2. **Limited Input Options**

- The AS-100.4S typically includes analog inputs (RCA, XLR) and sometimes digital inputs (optical, HDMI ARC), but it may lack advanced features like multiple digital formats (e.g., HDMI eARC, coaxial S/PDIF). This could be a limitation for users relying heavily on digital sources.

3. **No Built-in Subwoofer Amplification**

- While it can drive subwoofers via its channels, it lacks a dedicated subwoofer amplifier section. If you need a separate subwoofer, you ll need to allocate one channel to it, reducing the number of satellite speakers you can drive.

4. **Price Relative to Alternatives**

- At a higher price point than basic amplifiers, the AS-100.4S may not offer significantly better performance than mid-range Class-AB amplifiers (e.g., Denon PMA-1000N, Yamaha A-S301). For some users, the extra cost may not justify the Class-D advantages.

5. **Ventilation Requirements**

- Like most active amplifiers, the AS-100.4S generates heat and requires proper airflow. Placing it in an enclosed cabinet or near other heat sources can reduce performance or lifespan.

6. **No Built-in DSP or Advanced Features**

- Unlike some high-end amplifiers (e.g., NAD C 670, McIntosh MA-40), the AS-100.4S lacks digital signal processing (DSP), room correction, or advanced equalization tools. This may limit its appeal to users who want more control over their audio system.

7. **Potential for Cable Noise**

- While balanced outputs help, long or poorly shielded cables can still introduce noise, especially in sensitive listening environments. High-quality cables may be necessary for optimal performance.

8. **Limited Brand Recognition**

- Mosconi is a well-regarded brand in Europe and among audiophiles, but it may not have the same level of recognition or dealer support as more mainstream brands (e.g., Yamaha, Klipsch, or Denon). This could affect availability or service options in some regions.

9. **No Built-in Protection Against Short Circuits**

- Some amplifiers include automatic shutdown or protection against short circuits. The AS-100.4S may rely on user caution to prevent damage from improper wiring or speaker faults.

10. **Learning Curve for Advanced Users**

- While user-friendly, the active crossover function requires careful setup to avoid phase issues or frequency response problems. Users unfamiliar with crossover design may need to experiment to achieve optimal results.

---

### **Conclusion**

The **Mosconi AS-100.4S** is a robust, high-performance amplifier suited for audiophiles and home theater enthusiasts who prioritize clean power delivery, active crossover functionality, and reliability. Its Class-D design offers efficiency and compactness, making it ideal for multi-channel setups where space and power are critical. However, it may not be the best choice for users who prefer Class-AB amplifiers, require advanced DSP features, or need extensive digital input options.

- You need a versatile, 4-channel amplifier for front and rear speakers.

- You value balanced outputs and low distortion.

- You re working with high-efficiency speakers or need precise crossover control.

- You appreciate Mosconi s reputation for build quality and long-term reliability.

- You rely heavily on digital sources with advanced formats (e.g., eARC, high-bitrate audio).

- You prefer Class-AB amplifiers for perceived "warmer" sound.

- You need built-in subwoofer amplification or DSP features.

- You re on a tight budget and can find comparable performance elsewhere.

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### **Recommendation**

If you re building a **high-end home theater system** or a **multi-channel audio setup** where power, reliability, and active crossover functionality are priorities, the **Mosconi AS-100.4S** is an excellent choice. Its balanced outputs, clean amplification, and compact design make it a strong contender in its class.

For **budget-conscious buyers**, consider alternatives like the **Denon PMA-1000N** (Class-AB, 100W, 4-channel) or **Yamaha A-S301** (Class-D, 100W, 4-channel) for similar performance at a lower cost. If you need **more advanced features** (e.g., DSP, room correction), look into **NAD C 670** or **McIntosh MA-40**.

Ultimately, the AS-100.4S is a **solid investment for audiophiles** who want a no-frills, high-performance amplifier with active crossover capabilities. Pair it with high-quality speakers and a well-designed system for the best results.

Details:

Has slight blushing on the finish like these all seem to have - couldn capture in photos Mosconi AS100.4. Has never been opened or repaired. Mosconi AS100.4, The Gladden AS 100.4s is a high-performance 4-channel Class AB amplifier designed for audiophiles who demand both power and precision. Here are its key specifications 4 x 100W RMS Ohm.

Bridged Mode: 2 x 310W RMS 4 Ohm, 480W Ohm.

part #: as1004s prices

• $699.99-$3546.76

specifications caramplifieca:

• brand: Mosconi
• mpn: As100.4s
• model: As100.4s Silver
• part type: Amplifier
• rms power: 400w
• country of origin: Italy

general caramplifieca:

• condition: Used
• Vehicle Electronics GPS > Car Audio > Car Amplifiers

shipping caramplifieca:

• class: Standard
• cost: $0.00
• carrier: UPS
• service: UPS Ground
• type: Calculated
• transit: 4-8 Days

seller caramplifieca:

• city: Manchester, New Hampshire
• rating: 100.0%
• # reviews: 444

offer caramplifieca:

• availability: In Stock
• quantity: 1
• best offers: True
• sold: 0
• started: February 22, 2026
• options: Ship-to-home

returns caramplifieca:

• policy: Returns Accepted
• method: Money back
• paid by: Buyer
• time: 30 Days

payments caramplifieca:

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• credit card: Discover
• wallet: Google-pay

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