ACOUSTIC RESEARCH 2100450B Ar Woofer Refoamed AR28 AR9LS AR98

( Brand: Acoustic Research ), ( Manufacturer Part Number: 2100450B ), ( Compatible Brand: For Acoustic Research ), ( Type: Woofer ), ( Size: 8 In ), ( Country Of Origin: United States )

Review ACOUSTIC RESEARCH Ar Inch Woofer Refoamed Used In Etc

The **Acoustic Research (AR) 2100450B AR Woofer Refoamed AR28/AR9LS/AR98** is a meticulously crafted, high-performance replacement woofer designed to restore the pristine audio integrity of classic Acoustic Research speaker systems, including the legendary **AR28, AR9LS, and AR98** models. Engineered with precision and built to exacting standards, this refoamed driver embodies the same legendary craftsmanship that defined Acoustic Research s reputation for uncompromising sound quality. The **2100450B** is a **18-inch, long-throw, high-excursion woofer** featuring a **dual-layer, high-temperature, high-modulus foam surround** that ensures optimal cone movement while maintaining structural rigidity, reducing distortion and enhancing bass extension. Its **large, lightweight cone** typically constructed from high-quality, acoustically transparent materials like **paper or composite blends** is designed to deliver deep, tight, and dynamic bass with remarkable clarity, even at high SPLs. The **high-efficiency, low-distortion voice coil** is wound with precision to minimize inductance and resistance, allowing for extended frequency response and improved transient response, critical for reproducing the full spectrum of musical dynamics without fatigue. The **refoamed version** of this woofer is particularly valuable for owners of vintage AR systems, as it restores the original performance characteristics while incorporating modern refinements in materials and construction to mitigate wear and tear over time. Whether used in a **high-fidelity home audio setup, a professional monitoring environment, or as part of a restored classic speaker system**, the **AR 2100450B** ensures that the rich, open, and detailed sound signature for which Acoustic Research is renowned is faithfully preserved bridging the gap between heritage audio design and contemporary performance demands.

### **Pros and Cons of buying a Acoustic Research 2100450B (AR Woofer Refoamed with AR28, AR9LS, AR98)**

#### **Pros**

1. **High-Quality Refoaming Process** The woofer has undergone a professional refoaming treatment, which can restore its original stiffness and reduce distortion. This often improves sound accuracy and reduces cone breakup at higher frequencies.

2. **Compatibility with AR28, AR9LS, and AR98** These are high-end AR components, meaning the system is likely designed for precise sound reproduction. The AR28 is a known high-performance crossover, while the AR9LS and AR98 are excellent midrange and tweeter options, respectively.

3. **Potential for Improved Performance** If the original woofer was degraded (e.g., from age, heat, or improper handling), refoaming can significantly enhance its performance, making it sound closer to new.

4. **Cost-Effective Upgrade** Refoamed woofers are often cheaper than brand-new ones, offering a budget-friendly way to improve an existing speaker system without replacing the entire cabinet.

5. **AR Brand Reputation** Acoustic Research is a respected name in high-fidelity audio, known for precision engineering and long-term reliability.

6. **Better Handling of Low Frequencies** A properly refoamed woofer can maintain better excursion control, reducing cone wear and improving bass extension without distortion.

7. **Potential for Customization** If you re building or modifying a speaker, a refoamed AR woofer can be a reliable choice for a balanced system.

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#### **Cons**

1. **Variable Quality of Refoaming** Not all refoaming processes are equal. If the treatment was rushed or poorly executed, the woofer may still suffer from uneven stiffness, leading to poor sound quality.

2. **No Guarantee of Original Performance** Even with refoaming, the woofer may not fully return to its original condition, especially if it was severely damaged before treatment.

3. **Potential for Overheating** If the woofer was previously abused (e.g., excessive power handling), refoaming may not fully mitigate long-term risks like voice coil damage or spider failure.

4. **Limited Warranty or No Return Policy** Many refoamed drivers come without warranties, meaning you bear the risk if issues arise after purchase.

5. **Compatibility Issues** While the AR28, AR9LS, and AR98 are excellent components, ensuring proper crossover design and impedance matching is crucial. Mismatched components can lead to inefficiencies or even damage.

6. **Resale Value Concerns** Refoamed drivers may not hold their value as well as new ones, especially if the market favors fresh components.

7. **Potential for Hidden Damage** Even if the woofer looks fine, internal issues like delamination or spider wear may persist, affecting long-term performance.

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### **Conclusion**

The **Acoustic Research 2100450B (refoamed with AR28, AR9LS, AR98)** can be an excellent choice if you re looking for a high-quality, cost-effective upgrade to an existing speaker system. The refoaming process can significantly improve the woofer s performance, and pairing it with AR s premium components ensures a well-balanced, accurate sound signature.

However, the effectiveness of the refoaming depends on the quality of the treatment, and there s always a risk of hidden flaws. If you re building a new system or prioritizing long-term reliability, investing in a new AR woofer might be preferable. On the other hand, if you re on a budget and trust the refoaming source, this could be a smart purchase for enhancing an existing setup.

### **Recommendation**

- **Buy if:** You have an existing AR speaker system, the refoaming source has a good reputation, and you re satisfied with the components (AR28, AR9LS, AR98). This can be a cost-effective way to refresh your system.

- **Consider alternatives if:** You re building a new system from scratch, prefer maximum reliability, or want a warranty. In that case, a new AR woofer (e.g., AR2100 or AR2100A) paired with the same crossover and tweeters might be worth the extra cost.

- **Verify before purchasing:** Check reviews of the refoaming service, ask for test recordings if possible, and ensure the crossover design is optimized for the driver s specifications.

Ultimately, this setup can deliver **excellent sound quality** if executed well, making it a strong option for audiophiles who value precision and value.

Details:

They have been carefully refoamed on the BACK of cone as per original specs. They have been playing flawlessly in my much modified AR94S for around two years now. I use quality surrounds from Tom at My Audio Addiction, and have been reforming speakers for over 20 years now. These were used in the AR28, AR28S, AR28B, AR94, AR94S and AR94R, AR9LS, AR9LSi, AR98 as well some other speakers from that era.

Comes with gaskets, trim rings, and mounting screws. Up for sale is a pair of AR Acoustic Research woofers part number 2100450B.

part #: 2100450b prices

• $25.16-$69.99

specifications speakerpartgo:

• brand: Acoustic Research
• mpn: 2100450b
• compatible brand: For Acoustic Research
• type: Woofer
• size: 8 In
• country of origin: United States

shipping speakerpartgo:

• class: Standard
• transit: 4-8 Days
• cost: $25.64
• carrier: UPS
• service: UPS Ground
• type: Calculated

payments speakerpartgo:

• credit card: Diners-club
• wallet: Paypal
• other

seller speakerpartgo:

• # reviews: 859
• rating: 100.0%
• city: Sicklerville, New Jersey

offer speakerpartgo:

• best offers: True
• started: April 3, 2026
• options: Ship-to-home
• quantity: 1
• sold: 0
• availability: In Stock

general speakerpartgo:

• condition: Used
• TV, Video Audio Parts > Speaker Parts Components > Other Speaker Parts Comp

returns speakerpartgo:

• policy: No Returns

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