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Ships within 48 hours · Estimated delivery Aug 29 - Sep 3
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Description
Rockford Fosgate RM18D4BGeneral Features: 8" Dual 4 ohm Prime R1 Marine Subwoofer Power Handling: Peak: 300 watts RMS: 150 watts Recommended Power Range: 75 200 watts RMS CEA 2031 Compliant Subwoofer Klippel Verified Subwoofer Meets or exceeds ASTM test standards for Marine Outdoor use 100% UV stable ASA injection molded plastic parts UV and salt fog resistant Santoprene surround Injection molded mineral filled polypropylene cone body with UV inhibitors Removable grille
General Features:
- 8" Dual 4-ohm Prime R1 Marine Subwoofer
- Power Handling:
- Peak: 300 watts
- RMS: 150 watts
- Recommended Power Range: 75 - 200 watts RMS
- CEA-2031 Compliant Subwoofer
- Klippel Verified Subwoofer
- Meets or exceeds ASTM test standards for Marine/Outdoor use
- 100% UV stable ASA injection molded plastic parts
- UV and salt fog resistant Santoprene surround
- Injection molded mineral filled polypropylene cone body with UV inhibitors
- Removable grille cover insert
- Ultra-flexible fully insulated silicone lead wire
- 1.5" aluminum voice coil diameter
- Proprietary corrosion resistant spring loaded push terminals
- Moisture, tear and fatigue resistant Aramid fiber spider
- Linear, high excursion matched motor magnetics and suspension design
- VAST Surround, provides up to a 25% more cone area
- Protected against Dust, UV, Water, Corrosion
- Dual 12 AWG compression speaker terminals
- FlexFit slot mounted frame pattern basket
- Top-mount depth: 3.60"
- Cutout Diameter: 7"
- Frequency Response: 31 - 250 Hz
- Sensitivity: 85 dB
- Xmax: 7 mm
- Resonance Frequency (Fs): 41.5 Hz
- Optimum Sealed Enclosure: 0.55 ft² (15.62)
- Optimum Vented Enclosure: 1.10 ft² (31.15)
- Also Optimized for Infinite Baffle (Free Air) Applications
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
4.6 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 1
Not something to read for pleasure...
Format: Paperback
Blech. I hated it. Buy only if your professor makes you.
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Reviewed in the United States on December 31, 2025
★★★★★ 2
The book is so not fun to read
Format: Paperback
Nothing with the seller, it's just the book that I don't like. Black and white, full of info and boring
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Reviewed in the United States on August 5, 2023
★★★★★ 5
Easy quick protein boost
Size: 360 Count (Pack of 1)
Easy, quick protein boost, little taste, quality product -- very happy with it. This is my third bottle.
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Reviewed in the United States on March 24, 2026
★★★★★ 5
It HAS helped with my energy levels!
Size: 360 Count (Pack of 1)
Might be better to take the powder, because I end up taking 12 of these tablets at a time to get the 6 grams of spirulina I want to take. But because they are simpler and cleaner than a powder would be, I may just stick with this! I have noticed my body has more stable energy on the days I remember to take this. And I can take them on an empty stomach which tells me they don’t have toxins or bad preservatives.
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Reviewed in the United States on July 22, 2025
★★★★★ 5
Quality Spirulina, A "Superfood"
Size: 360 Count (Pack of 1)
Google Spirulina if you don't know what it is. In short, it's from algae (in this case) that has been shown to provide many health benefits, and studies are underway to validate other claims. One important value: it is one of the few foods that cover essential amino acids. As I said, do your own research. I'm relating what I read and my personal experience.
This is, so far, the best spirulina I've found. It is a raw product, vegan, certified organic (by USDA), and proven "bio-active," meaning for me, I absorb it well.
It does have an "algae taste" and mild odor (of same). This is difficult to describe, but call it a mild "hay" tone to the flavor. Since it's a pill, it shouldn't bother you. I did notice it the first few weeks, though.
IMPORTANT: Not recommended for anyone suffering from phenylketonuria. Ask a medical professional first.
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Reviewed in the United States on June 7, 2023