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Description
Autotek SM4CX 4” STREET MACHINE Series 100W RMS | 200W Max 2-Way Coaxial Car Speakers (Pair)Autotek Street Machine SM4CX 4" 2 Way Coaxial Speakers 250 Watts The Autotek SM4CX 4 inch coaxial speakers are designed to deliver a massive audio upgrade in a compact, universal fit format. Engineered as part of the Street Machine series, these speakers utilize high quality Alpha Cellulose poly cones to produce rich midrange and surprisingly deep mid bass for their size. High frequencies are handled by moisture resistant Neo Mylar soft dome tweeters,
Autotek Street Machine SM4CX 4" 2-Way Coaxial Speakers – 250 WattsThe Autotek SM4CX 4-inch coaxial speakers are designed to deliver a massive audio upgrade in a compact, universal-fit format. Engineered as part of the Street Machine series, these speakers utilize high-quality Alpha-Cellulose poly cones to produce rich midrange and surprisingly deep mid-bass for their size. High frequencies are handled by moisture-resistant Neo Mylar soft dome tweeters, ensuring crystal-clear highs and long-term durability in automotive environments. With a high-strength Y30 ferrite magnet and an integrated passive Butterworth crossover, the SM4CX provides a smooth, balanced soundstage that far exceeds the performance of factory paper-cone speakers.
Key Features
- Alpha-Cellulose Poly Cones: Lightweight yet rigid cone material produces musical midrange and accurate tonal reproduction with high efficiency
- Neo Mylar Soft Dome Tweeters: Delivers ultra-clear high frequencies with a smooth response profile and enhanced resistance to the elements
- High-Strength Y30 Magnet: Equipped with a 5.2 oz motor structure to provide superior control and higher output with minimal distortion
- UV-Resistant Rubber Surrounds: Moisture-resistant surrounds ensure the cone remains perfectly centered while providing lasting mid-bass impact
- Thermal Management: Pure copper voice coil and Kapton former work with an over-coil cooling system to dissipate heat during high-volume playback
- Anti-Resonant Stamped Steel Basket: Heavy-duty frame construction minimizes unwanted vibrations and harmonics for a cleaner listening experience
- Integrated Crossover: Built-in passive Butterworth crossover with a 6dB slope ensures a seamless transition between frequency ranges
- Textured ABS Gasket: Provides a tight, vibration-free seal against factory OEM panels or custom mounting surfaces
- Universal Mounting: Compact design and standard mounting patterns make this an ideal replacement for most 4-inch factory locations
- Power Handling: 250 Watts Peak (125 Watts RMS) per pair
- Frequency Response: 80Hz – 20kHz
- Sensitivity: 88dB
- Mounting Depth: 2.2"
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
4.5 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Power steering clean
Size: 12 Fl Oz (Pack of 1)
Worked well for my Honda. Changed out the old fluid which was black. Now it's clean and yellow. Car drives a lot better steering. 5 stars.
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Reviewed in the United States on February 20, 2026
★★★★★ 5
The real stuff
Size: 12 Fl Oz (Pack of 1)
Fine product at a great price.
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Reviewed in the United States on March 23, 2026
★★★★★ 5
Both filters for the price of one.
This filter set for my 10th generation Honda Civic is an excellent value and fits perfectly. Before installing, I compared both the cabin and engine air filters to the originals to ensure proper sizing, and they matched exactly.
Replacing the cabin air filter was very simple and straightforward. The engine air filter requires a bit more effort since you need to remove four screws to access the housing, but it is still an easy process.
Once opened, you simply remove the old filter and place the new one inside. Both filters appear to be high quality and, in fact, looked better constructed than the ones I removed.
I especially appreciate that this set includes both filters together, making it convenient to replace them at the same time.
Recently, while at the dealership, I overheard a technician inform a customer that replacing her air filters would cost $90. Considering how simple the process is, that price felt excessive. This two pack is very reasonably priced, and I have paid nearly the same amount in the past for just one filter (not from the dealership but auto zone).
These filters are well made, fit properly, and offer significant savings compared to dealership and ur local auto stores. I plan to continue purchasing this set for future replacements.
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Reviewed in the United States on March 4, 2026
★★★★★ 5
Compatible for 2018 Honda CR-V
This is a compatible fitment, as described in the listing, for our 2018 Honda CR-V. It was accurately described online. It seems to be comparable quality to the ones I took out to replace these. If I recall, they had been just as good as the stock ones when I put those in. I would say these are just as good as OEM & they feel very well made & durable. I consider them a good value for how much I saved by installing these myself & not paying a dealership. I highly recommend this
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Reviewed in the United States on December 23, 2025
★★★★★ 4
Save money with this filter bundle!
The main reason you should get this Cabin Air Filter with an Engine filter, is the value. You get both filters for the price of one. To install, it will vary of difficulty in reaching the filter compartments, so for a Civic, is just open the glove compartment and two tabs behind it, and that's it. The engine one is a little bit trickier with two metal tabs, but easy as well.
As for quality, time will tell, but at first glance and overview, it looks of decent to good quality. So nothing bad to write about it. The cabin filter fit as expected. I haven't change the engine filter.
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Reviewed in the United States on January 13, 2026