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B&C Speakers R21DS115-4 21-inch Recone Kit for 21DS115-4 Neodymium Subwoofer 1700 Watts Rms 3400 Watts Peak 4-Ohms Motorcycle Car Pro Audio Sound Speaker Waterproof Front Side - RCK21DS1154
✅ In stock
📉 Price recently dropped
F
Grade
Analysis Confidence
100%
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Jul 23, 2026 10:01 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰The current price sits right around what this item typically fetches.
- 📉Pricing has not dipped this low in roughly six months, placing this offer among the better deals in that window.
- 📈The direction is downward at the moment; if that holds, an even better price may surface — though timing the market is never certain.
How We Scored This Deal
Price Competitiveness
0.12/28
Recent Value
4.98/22
Market Standing
3.69/20
Deal Strength
10/20
Momentum
10/10
📝 Product Overview
🏪 Sold by
High Volume Sales (Serial numbers recorded)
🚚 Shipping
Free Shipping
Product Details
✓GENERAL || Brand : B&C Speakers || Model Number : R21DS115-4 | R21DS115 | RCK21DS1154 || UPC : 8059300648988 | 718852125122 || This next evolution subwoofer uses a new, longer, four layer aluminum voice coil. The result is more energy in the gap, higher sensitivity, lower distortion and better overall performance. The 21DS115-4 features a 40mm long, 4.5 inch diameter (116mm) Copper Clad Aluminum Wire voice coil. || LF Recone Kit || Cone, Basket, Centering Shims ||
✓"FEATURES || Lightweight but powerful FEA-optimized neodymium magnet || Extremely high BL factor and Xmax for outstanding LF output || 14 mm Xmax, 60 mm peak-to-peak excursion before damage || 4.5"" split winding copper voice coil on fiberglass former || Ventilated voice coil gap reduces power compression || Aluminum demodulation ring on pole piece reduces distortion || Double silicone spider ||
✓"SPECIFICATIONS || Nominal diameter: 530 mm (21.0 in) || Nominal impedance: 4 Ohm || Minimum impedance: 4.2 Ohm || Nominal power handling: 1700 W || Continuous power handling: 3400 W || Sensitivity (1W/1m): 97.0 dB || Frequency range: 33 - 1000 Hz || Voice coil diameter: 116 mm (4.5 in) || Winding material: Copper || Former material: Glass Fibre || Winding depth: 34 mm (1.34 in) || Magnetic gap depth: 14 mm (0.55 in) || Flux density: 1.15 T ||
✓"PARAMETERS || Fs: 33 Hz || Re: 3.6 || Qes: 0.37 || Qms: 7.7 || Qts: 0.36 || Vas: 278.0 dm3 (9.7 ft3) || Sd: 1680.0 cm2 (260.4 in2) || o: 2.6 % || Xmax: 14.0 mm || Xvar: 15.0 mm || Mms: 335 g || Bl: 24.8 Txm || Le: 1.7 mH || EBP: 89 Hz ||
✓"MOUNTING INFORMATION || Overall diameter: 547 mm (21.5 in) || Bolt circle diameter: 527 mm (20.7 in) || Baffle cutout diameter: 508.0 mm (20.0 in) || Depth: 250 mm (9.9 in) || Flange and gasket thickness: 14 mm (0.53 in) || Air volume occupied by driver: 15.0 dm3 (0.53 ft3) || Net weight: 14.0 kg (30.8 lb) || Shipping units: 1 || Shipping weight: 16.4 kg (36.1 lb) || Shipping box: 590x590x300 mm (23.1x23.1x11.8 in)
⚙️ Specifications
Brand
B&C Speakers
Speaker Maximum Output Power
3400 watts
Connectivity Technology
Coaxial
Audio Output Mode
Stereo
Mounting Type
Floor Standing
Material
Aluminum
Model Name
R21DS115-4
Speaker Type
Subwoofer
Recommended Uses For Product
For DVD Players, For Gaming Consoles, For Surround Sound Systems
Compatible Devices
Gaming Console, Home Theater, Laptop, MP3 Player, Projector, Smartphone, Tablet, Television
Unit Count
1.0 Count