Most importantly great sound ! The tub made from fiberglass is a premium audio material, not like similar examples made from cut sheets of mdf stuck together. This will give you max output from using no boot space !
eBay
12V 220V Car Audio Active Subwoofer Motorcycle Bluetooth Speaker Box 8/10 Inch HiFi KTV Home Computer Speakers Bass 240W
Aliexpress UK
This product is very suitable for speaker repair. ● Colour: Black. ● Material: Foam. Our products have been designed to give the user an easy assembling and good repair experience.
eBay
10" 12" Speaker Cover Car Metal Grille Universal Metal Subwoofer Grill Rounded Edges Trim Exquisite Workmanship Dropship
Aliexpress UK
The BassPro SL2 self-powered subwoofer fits under the front seat of many vehicles, and adds deep full rich bass to your existing audio system. Its shallow-profile, 8" woofer is coupled with a custom tuned enclosure and is driven by a powerful Class D digital amplifier which making it a powerful solution.
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Dual magnetic double voice coil long stroke 10 inch 12 inch 15 inch subwoofer speaker overweight woofer
Aliexpress UK
Used in great condition, like new to be honest, with original box and accessories
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4''/6''/8''/10''/12'' Plastic Car Audio Speaker Sub Woofer Grille Guard Protector Cover Mesh Round Subwoofer
Aliexpress UK
Available in Espresso or Latte woodgrain finish with solid colour front baffles and matching grilles. 150W RMS (300W Dynamic). Low-Frequency Woofer. Adastra C8D 20CM (8") Ceiling Speaker With Directional Tweeter (Each).
eBay
10-inch Subwoofer Empty Box,DIY Car/Home Woofer Box,1Piece Bass Speaker Housing, Wooden Speaker Box,Bass Sound Box Hole 235mm
Aliexpress UK
The 200P profiles complete integration with and audio system via Line Level or LFE inputs. The LFE input bypasses the subwoofer's internal low-pass crossover. It is used when you're connecting the subwoofer to the dedicated subwoofer output of a receiver/processor that has its own low-pass crossover network.
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SOTAMIA 1Pcs 2 Inch Subwoofer Passive Speaker 4 Ohm 10-15W Square Dual Diaphragm Waterproof Mini Speaker for Power Amplifier
Aliexpress UK
RMS: 225 watts. Peak: 900 watts. Rubber Surround. Double Stacked magnet motor structure. Power Handling 1.5" High Temperature Voice coil.
eBay
6/10 Inch Subwoofer Active Tunnel Type 12V Car Speakers Sound System with Built-in Amplifier Sound Box
Aliexpress UK
New Refurbished. GOOD LUCK!!!
eBay
1 Piece Kasun KS-10456 10'' Subwoofer Speaker Massive Rubber Suspension Dark Green PP Cone 8ohm/250W Fs=32Hz Panel OD=260mm
Aliexpress UK