SS AUDIO D-420-2-101-SSA Fostex Swr Diaphragm Horn Driver Speaker Repair

( Brand: Ss Audio ), ( Manufacturer Part Number: D-420-2-101-SSA ), ( Compatible Brand: Universal ), ( Type: Tweeter ), ( Size: 2.875 ), ( Connectivity: Wired ), ( Suited For: High Frequencies )

Review SS AUDIO Matched Pair Of Fostex Swr Diaphragm Horn Driver Speaker Repair

The **Fostex SWR Diaphragm (D-420-2-101-SSA)** is a meticulously engineered replacement component designed specifically for repairing and restoring vintage or high-performance horn-loaded speaker systems, particularly those featuring the iconic Fostex SWR (Super Wide Range) horn driver series. Crafted from a premium **aluminum alloy diaphragm** with a precision-machined, dome-shaped profile, this part ensures optimal acoustic performance by maintaining the original driver s efficiency, frequency response, and dynamic range. The diaphragm s lightweight yet durable construction minimizes distortion while maximizing energy transfer, making it an ideal match for applications requiring clarity, depth, and extended frequency extension whether in professional sound reinforcement, broadcast audio, or high-end audio reproduction systems. The **D-420-2-101-SSA** is compatible with the Fostex SWR-420 series and similar horn-loaded drivers, where its smooth, resonant surface helps sustain a consistent wave pattern critical for accurate sound projection. Built to withstand the rigors of frequent use, this diaphragm is treated with corrosion-resistant coatings to ensure longevity, even in demanding environments. Whether restoring a classic PA system, repairing a studio monitor, or upgrading a custom-built horn speaker, this component delivers the precision and reliability expected from Fostex s legacy of audio excellence, bridging the gap between original performance and modern restoration needs with uncompromising fidelity.

### **Pros and Cons of buying a Fostex SWR Diaphragm (Audio D-420-2-101-SSA) for Horn Driver Speaker Repair**

1. **Compatibility and Fit:** The Fostex SWR diaphragm is specifically designed for horn-loaded drivers, particularly those used in professional audio systems, public address (PA) speakers, and high-quality studio monitors. If your horn driver is a **Fostex SWR series** (such as the D-420, D-421, or similar), this part is an exact or near-exact replacement, ensuring proper acoustic performance and mechanical fit.

2. **High-Quality Materials:** Fostex is a well-regarded brand in professional audio, known for durable and reliable components. The SWR diaphragm is made from **aluminum or other lightweight, rigid materials**, which are optimized for efficiency and longevity in horn-loaded systems.

3. **Ease of Installation:** Since this is a direct replacement part, swapping it out typically requires minimal disassembly. The diaphragm is often held in place by a spider or suspension system, and if the surrounding components (voice coil, magnet structure, etc.) are intact, the repair can be straightforward.

4. **Cost-Effective for Critical Components:** Horn drivers are often expensive to replace entirely, especially if the rest of the driver (voice coil, magnet, etc.) is still functional. Replacing just the diaphragm can extend the life of the speaker at a fraction of the cost of a full unit replacement.

5. **Maintains Original Sound Signature:** If the diaphragm fails, it may cause distortion, reduced output, or uneven frequency response. Replacing it with an identical or high-quality alternative helps preserve the original tonal characteristics of the speaker system.

6. **Widely Available:** As a legacy component, Fostex SWR diaphragms are still stocked by some specialty audio repair shops, online marketplaces (eBay, Amazon, or audio repair forums), and distributors. This makes sourcing relatively easier than for discontinued or rare parts.

---

1. **Age and Obsolescence:** Fostex has largely exited the consumer speaker market, and some of their professional components (like the SWR series) are no longer in production. This means:

- **Limited availability** you may need to search for used or refurbished units.

- **Potential counterfeit parts** some sellers may offer knockoffs that don t meet original specifications, leading to poor performance or failure.

- **No official support** if issues arise, you ll rely on community forums or repair guides rather than manufacturer assistance.

2. **Compatibility Risks:** While the **D-420-2-101-SSA** is likely a match for many horn drivers, there are variations within the Fostex SWR line. Double-check:

- The **driver model number** (e.g., D-420 vs. D-421).

- The **horn type** (some horns require specific diaphragm dimensions or mounting styles).

- The **voice coil diameter** (if the diaphragm is too large or small, it may not fit properly).

- **Spider/suspension compatibility** if the suspension is damaged, replacing just the diaphragm won t fix mechanical issues.

3. **No Warranty:** Since this is a used or aftermarket part, there s no guarantee of quality or longevity. A defective diaphragm could fail again shortly after installation.

4. **Skill Dependency:** If you re not experienced with speaker repair, improper handling (e.g., damaging the voice coil, misaligning the diaphragm, or using incorrect adhesive) can worsen the issue or void the driver entirely.

- **Reusing the diaphragm from a donor speaker** (if you have a spare).

- **Upgrading to a modern alternative** (some companies offer compatible replacements with improved performance).

- **Full driver replacement** (if the voice coil or magnet is also degraded).

6. **Cost vs. Value:** While replacing a diaphragm is cheaper than buying a new driver, the part itself may cost **$50 $150 **, depending on condition and seller. If the driver is otherwise healthy, this is a worthwhile investment. However, if the rest of the driver is failing, the cost-benefit may not justify the repair.

---

### **Conclusion**

- The diaphragm is confirmed as the failing component.

- The rest of the driver (voice coil, magnet, suspension) is intact.

- You can source an **authentic or high-quality replacement** (avoiding counterfeits).

- You have **basic repair skills** or access to guidance.

- **Limited availability** and potential for counterfeit parts.

- **Compatibility risks** if the driver model or horn type varies slightly.

- **No warranty or support**, making troubleshooting harder.

If you re confident in the diagnosis and can verify the part s authenticity, proceeding with the replacement is a solid choice. If uncertainty exists, consulting a professional audio repair technician may be safer.

---

### **Recommendation**

1. **Verify the exact model** of your horn driver and confirm it matches the **D-420-2-101-SSA** (or equivalent). Check the driver s label for the correct part number.

2. **Purchase from a trusted source** look for sellers with positive reviews, clear photos, and return policies. Avoid suspiciously cheap listings that may be counterfeit.

3. **Test the diaphragm** before installation. If possible, check for physical damage (tears, delamination) or electrical continuity (though this is less common for diaphragms).

- Use **non-conductive adhesive** (like silicone or speaker glue) to reattach the diaphragm.

- Ensure the **voice coil is clean and undamaged** before reassembly.

- Test the driver after repair with a **low-power signal** to avoid damaging the voice coil.

5. **Consider professional help** if you re unsure about compatibility or repair techniques. A technician can confirm whether the diaphragm is the only issue and perform the repair correctly.

6. **Document the repair** note the part used and any adjustments made, which may help in future troubleshooting.

**Final Verdict:** If the diaphragm is the sole failing component and you can source a genuine replacement, this is a **worthwhile repair**. However, weigh the effort and cost against the driver s age and overall condition sometimes, upgrading to a modern driver may be more future-proof.

Details:

These were purchased brand new and never used. Sound Tech: CST-12, CX-4, B5TS. Full list of compatible model's below. Elector-Voice, EV: 85705, 800571, Fri-2082, Fri-28lpm, Force I Monitor, Monitor-e.

Both are in mint condition and measure spot on with my multi meter.

part #: d4202101 price

• $34.30

specifications speakerpartgo:

• brand: Ss Audio
• mpn: D-420-2-101-ssa
• compatible brand: Universal
• type: Tweeter
• size: 2.875
• connectivity: Wired
• suited for: High Frequencies

returns speakerpartgo:

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

payments speakerpartgo:

• credit card: Diners-club
• wallet: Apple-pay
• other

seller speakerpartgo:

• city: Charlotte, North Carolina
• rating: 100.0%
• # reviews: 2370

general speakerpartgo:

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

offer speakerpartgo:

• started: March 10, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True
• quantity: 1

shipping speakerpartgo:

• cost: $8.10
• carrier: USPS, FedEx
• transit: 3-8 Days
• service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery
• type: Calculated
• claSs: Standard, Expedited

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