Advertising Disclosure
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Best Choice Pyle 
Pyle PLMRW8 8-Inch Outdoor Marine Audio Subwoofer - 400 Watt Single White Waterproof Bass Loud Speaker for Marine Stereo 400 WATT POWER: Pyle’s 8 Inch Marine Subwoofer offers a peak power of 400 watts w/ 4ohm impedance. It lets you pump outFusion 
Fusion XS Series 600W 10" Sports Marine Subwoofers Engineered to high standardsBest Value Polk Audio 
Polk Audio DB1042 DVC - DB+ Series 10" Shallow Subwoofer for Marine/Car Sound System, 28Hz-200Hz Frequency Response, Dua ULTRA-POWERFUL SUBWOOFER FOR CAR & MARINE - The Polk DB1042 DVC 10" Marine Certified Subwoofer is a space-saving sub witPyle 
10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Marine Underseat Car Subwoofer with Bu 900 WATT POWER: 10" Amplified Low Profile Subwoofer System offers a maximum power of 900 watts. It lets you pump out somPyle 
8-Inch Low-Profile Amplified Subwoofer System - 600 Watt Compact Enclosed Active Marine Underseat Car Subwoofer with Bui 600 WATT POWER: Pyle’s 8" Amplified Low Profile Subwoofer System offers a maximum power of 600 watts. It lets you pump oPyle PYLE PLMRW10 10-Inch 500-Watt 4-Ohm Marine Subwoofer (White) High-quality Polypropylene ConePolk Audio 
Polk MM1 Series 10 1200W 4 Ohm Single Voice Coil ATV Car & Marine Subwoofer 10 inch MM1 Series 1200W single voice coil marine subwooferPolk Audio POLK AUDIO DB1042 Marine Certified Subwoofer-10 Delivers thunderous sonic output and powerful low frequency responseRidgeline Fusion Signature 3 Sports CRGBW LED Marine Subwoofer White 12in 1400W Polk Audio Polk Audio DB1242DVC DB+ Series 12" Dual Voice Coil Subwoofer with Marine Certification - Each Polk Audio DB1242DVC 12" 1110 Watt Dual 4-Ohm Car/Marine Audio Subwoofer Sub. Driver Compliment: 12" (304.8mm). Cutout DGarmin Fusion FM Series 400W 10" Round Marine Subwoofer, White Designed to add low frequencies to your audio systemPolk Audio Polk MM1 Series 8 900 Watt 4 Ohm Single Voice Coil Car Audio Marine Subwoofer Polk Audio MM842SVC 8" 900 Watt Single 4-Ohm Car/Marine Boat Audio Subwoofer Sub . Driver Compliment: 8" (203.2 mm). CutPyle Pyle 6.5 Inch Dual Marine Speakers - 2 Way Waterproof and Weather Resistant Outdoor Stereo Sound System with 400 Watt Po COMPLETELY WATERPROOF: This is a marine speaker that’s completely waterproof and can be used for several vehicles becausFusion Fusion XS Series 600W 10" Classic Marine Subwoofers Engineered to high standardsPolk Audio Polk MM1 Series 10 1200W 4 Ohm Dual Voice Coil ATV Car & Marine Subwoofer ROBUST SUBWOOFER FOR CAR & MARINE - The Polk MM1042 DVC 10" Marine Certified Subwoofer is a superior performing sub builLuocute Underseat Subwoofer, Subwoofer and Amp Package, 10 Inch Active Subwoofer, Ultra Thin 800W Under Powered Car Subwoofer, C COMPACT AND SPACE-SAVING: This slim active subwoofer is designed to fit perfectly under your seat, taking up minimal spaPolk Audio Polk Audio 1110 Watt 12 Inch Single Voice Coil Marine Car Subwoofer | DB1242SVC Works in cars, motorcycles, ATVs, and boats; Peak power handling: 1110 watts; Continuous power handling: 370 wattsPyle Pyle 10 Inch Subwoofer System - 400 Watts Powered Subwoofer for Marine & Powersports, Quick-Mount, Water Resistant Vehic POWERFUL 10" SUBWOOFER - Delve into deep, impactful bass with this compact, 10 inch subwoofer. Optimized for small space27% Off Pyle Pyle 2-Way Dual Waterproof Off-Road Speakers - 4 Inch 800 Watt Marine Grade Wakeboard Tower Speakers System, Full Range AMPLIFY YOUR RIDE: Pyle’s 800W dual marine grade off-road speaker system is what you need to listen to high-quality audiPioneer Pioneer TS-ME100WC 10" Marine Component Subwoofer with 900 Watts Max and Classic Grille Design 300 Watts Nominal PowerGarmin Fusion XS Series 600W 10" Sports Marine Subwoofer with RGB LED Lighting Engineered to high standardsFUSION Fusion FM Series 400W 10" Square Marine Subwoofer, White Designed to add low frequencies to your audio systemLANZAR Lanzar 8" Subwoofer, 1000W Low-Profile Marine Waterproof Car Subwoofer with Built-in Amplifier, Adjustable Bass Boost, R COMPACT YET POWERFUL 8" SUBWOOFER – Experience deep, rich bass with this 8 inch subwoofer, featuring a low-profile desigGarmin Garmin Fusion Apollo 10” LED Marine Subwoofer with Sports Gray Grille | AP-SL10SPG Premium marine subwoofer with premium sound quality available in 10” and 12” sizesPolk Audio Polk Audio 8 DVC MM1-Series Subwoofer 900 W with Marine Certification Premium upgrade tuned for the total sonic accuracy found in a studio subwooferFusion Fusion FM Series 400W 10" Square Marine Subwoofer, Black Designed to add low frequencies to your audio systemPyle Waterproof Marine Wakeboard Tower Speakers - 4 Inch Dual Subwoofer Speaker Set with 300 Max Power Output - Boat Audio Sy 2-WAY AUDIO SYSTEM: The wake speakers feature an impressive bass response. The ideal subwoofer speakers for your wakeboaFusion Fusion FM Series 400W 10" Round Marine Subwoofer, Black Designed to add low frequencies to your audio systemFusion Fusion XS Series 200W 6.5" Sports Marine Speakers with RGB LED Lighting Engineered to high standardsDS18 DS18 NXL10SUB Outdoor Marine Audio Subwoofer with RGB - 600 Watt MAX 300 Watt RMS 10-Inch White Waterproof Bass Loud Spe DS18 NXL-10SUB/WH Marine Subwoofer Built to Endure the Elements IP65 waterproof rating protects against rain, saltwater,Dpofirs Dpofirs Power Home HiFi Stereo Amplifier, Mini Hi-Fi Class D Integrated Amp for Home Speakers, Subwoofer, MP3, Car, Mari Control structure: treble / bass / volume control. CD-DVD-MP3 input. Two main channel outputs. On / off control. Two mai14% Off BOSS Audio Systems BOSS Audio MRGB65B 200 Watt (Per Pair), 6.5 Inch, Full Range, 2 Way Marine Speakers, (Sold in Pairs) Multi Color LED Ill Control Of LED Light Functions. Constant One Color Illumination, Rotate Between Multiple Colors In a Strobe or Fade Mode12% Off Yamaha Yamaha NS-SW050 Subwoofer Speaker with Twisted Flare Port, Black New Twisted Flare Port contributes to clear and tight bass; Provides accurate low frequency reproductionEdifier Edifier T5 Powered Subwoofer - 70w RMS Active Woofer with 8 inch Driver and Low Pass Filter 8" SPEAKER DRIVER - Delivers powerful sound with highly accurate bass to provide you with a better listening experience.Aquatic AV AquaticAV AQ-SWA8-6BT 8" Loaded Marine Enclosure Bluetooth Active Subwoofer Full Range Waterproof 288W Max w/Built in Cr Waterproof (IPX4 rated) Vinyl coated MDF box 8" Polypropylene woofer conePyle Lanzar AQ5CXS 400 Watts 5.25-Inch 2-Way Marine Speakers Silver WATER RESISTANT: A pair of marine speakers that are water resistant and coated with resin treatment. Can be placed indooDS18 DS18 NXL-12SUB 12" 700W Marine Subwoofer alpine Alpine (ALPINE) powered subwoofer 20cm under the seat-mounted SWE-1080 Product Weight: 13.2 lbs (6.08 kg)H YANKA H YANKA 400W 8 Inch Powered Underseat Subwoofer Car Audio, Black, Slim and Compact Design, Built-in Amp, Plug and Play, 【Powerful Bass】Enjoy a powerful and deep bass sound in your car with our subwoofer. The 8-inch subwoofer delivers clearBOSS Audio Systems BOSS Audio MR50W 150 Watt (Per Pair), 5.25 Inch, Full Range, 2 Way Weatherproof Marine Speakers (Sold in Pairs) Impedance: 4 Ohms, Frequency Response: 80 Hz - 20 kHz, Sensitivity: 89 dBFusion Fusion 1400W 12" Sports Grill Marine Subwoofers with CRGBW Lighting, White Enjoy high-resolution bass reproduction from the quality polypropylene coneOrion Orion XEQ-X70BTM 7-Band Graphic Equalizer W/Bluetooth –Marine Grade IPX5 Rated, Subwoofer Control, Front 3.5mm AUX Input Precision Audio Tuning: Seven adjustable frequency bands (50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz, 6kHz, 16kHz) with ±12dB booMTX MTX Audio RT8PT Universal Powered Subwoofer Enclosure Amplified Tube Subwoofer: Single 8-inch subwoofer features a built-in amplifier; Power packed with 240 Watt MAX and 120VOXXBASS Bluetooth Marine Radio Receiver Waterproof - 200 Watts Boat Stereo Head Unit with Subwoofer USB AUX AM FM for ATV UTV RZ MARINE GRADE WATERPROOF PERFORMANCE: Designed with water resistant IPX5 rating and UV coating durable front panel, the bPyle Pyle 4-Channel Marine Amplifier Receiver - Waterproof and Weatherproof Audio Subwoofer for Boat Stereo Speaker & Other W WATERPROOF & WEATHERPROOF: The audio amplifier is waterproof with its marine grade rating of IP-65. It has a rugged consPyle Pyle 6.5 Inch Dual Marine Speakers-2 Way IP44 Waterproof, Weather Resistant Outdoor Audio Stereo Sound System with 200 W IP44 MARINE GRADE: Comes with 2 speakers that are waterproof with a marine grade of IP44. Can be used outdoors because iPyle Pyle 200 Watt Marine Speaker System - Weather Resistant Dual 2 Way 6.5 Inch Outdoor Stereo Audio Sound Speakers w/ 85Hz- 85Hz-6kHz FREQUENCY RESPONSE: Pyle’s dual 6.5 inch weather-resistant marine speakers with 0.5” neodymium dome tweeter sp14% Off GUYOS GUYOS 10 Inch 600W Car Subwoofer High Power Pure Bass Under-Seat Power Amplifiers Speaker 12 V for Car Truck RV Easy to install and use, compatible with 12.0V voltage for car, truck, RV, marine boat, etc.28% Off Pyle Pyle PLMR62 Dual 6.5'' Water Resistant Marine Speakers, 2-Way Full Range Stereo Sound, Built-in Tweeters, 200 Watt, Whit Includes (2) 6.5'' Component Speakers - Marine Grade Waterproof ConstructionSOLUSTRE SOLUSTRE 10 Inch Car Subwoofer Enclosure Box Subwoofer Enclosure for Vehicle Wood Abs Construction Enclosure for car subwoofer: the subwoofer enclosure not only enhances sound performance but also provides a luxurious aPyle Pyle PLMR41B Dual 4.0'' Waterproof Marine Speakers, 2-Way Full Range Stereo Sound, 100 Watt, Black (Pair) Includes (2) 4.0'' Component Speakers - Marine Grade Waterproof ConstructionPyle Pyle PLBW104 10-Inch 1000 Watt DVC Subwoofer Blue Injection Molded ConeGeloo Geloo Marine Radio Receiver Waterproof Boat Stereo Radio System with AUX-in Subwoofer Pre-Amp EQ, AM/FM Radio Receiver D HIGHLY FUNCTIONAL: Boat Stereo Radio with AM/FM/USB/MP3/support wireless function, AUX audio input, 4×50W max power outpH YANKA H YANKA SODA-10ASW 480W 10 Inch Compact Underseat Subwoofer with Built-in Amp, Slim Powered Subwoofer for Car/Truck/Jeep 【Powerful Bass Performance】Immerse yourself in a world of deep, resonant bass with the HYANKA 480W 10 Inch Compact UnderRiksam 8" Car Subwoofer Under-Seat Audio Sub Woofer 800W Slim Box Amplifier Speaker Kit The external configuration of high strength stainless steel horn protection net cover.13% Off Pyle Pyle Dual 5.25'' Water Resistant Marine Speakers, 2-Way Full Range Stereo Sound, 150 Watt, White (Pair) Includes (2) 5.25'' Component Speakers - Marine Grade Waterproof Constructionwet sounds wet sounds Zero 10 S4 XZ-W High-Output 10" Sealed Enclosure Marine Subwoofer PREMIUM MARINE SUBWOOFER: The Wet Sounds ZERO Series 10 S4 XZ-W is a high-performance marine subwoofer designed to delivRockville Rockville Pair RSM65B 6.5" 320 Watt Waterproof Shallow Slim Marine Boat Speakers Pair Rockville RSM65B 6.5" 320 Watt Waterproof Shallow Marine Speakers. CEA Compliant Power Ratings.Pyle Pyle Marine Speakers - 5.25 Inch 2 Way Waterproof and Weather Resistant Outdoor Audio Stereo Sound System with 180 Watt WATERPROOF: Comes with 2 marine speakers that are waterproof with a standard size of 5.25 inches each. Can be used for s24% Off Pioneer Pioneer TS-WX306B 30cm subwoofer pre-Loaded in Sealed Enclosure (1300W) Subwoofer with Bass Reflex EnclosurePIONEER Pioneer TS-ME100WS 10" Marine Subwoofer Sport Grille mica-reinforced polypropylene cone with rubber surroundAudioengine Audioengine S8 250W Powered Subwoofer, Smooth hi-fi Subwoofer, Built-in Amplifier, Designed for Audio and Home Theater P ✔ ESSENTIAL BUNDLE: Audioengine S8 pc speakers bass comes with a powered subwoofer, 2m RCA audio cable, 3.5mm mini-jackGME GME GS320W 60W 4" Marine Box Speakers - White Douk Audio Mini HiFi Stereo 2.1 Channel Audio Amplifier for Home Car Marine Subwoofer Amp With standard stereo RCA and 3.5mm AUX inputs, can be perfectly compatible with ipad, mobile phone, MP3, CD player, TV,Rockford Rockford Fosgate RM110D2B Prime 10" Dual 2-Ohm Subwoofer Black BOSS Audio Systems BOSS Audio Systems MRGB55B 5.25 Inch Marine Speakers - Weatherproof, 150 Watts Per Pair, 75 Watts Each, Multi-Color Illu RGB Illumination: Change the mood with the multi-color illumination option. It looks great, especially at night!H YANKA H YANKA 15 Inch Subwoofer - 15 Inch Paper Cone Subwoofer Car Audio, Black Steel Basket, Dual Voice Coil 2 Ohm Impedance 1.【Powerful Sound】【Powerful Sound】Experience the power of the H Yanka BSF Series 15-inch Competition Subwoofer. With anDOVOX Bluetooth Marine Stereo Receiver: Waterproof Gauge Radio System - Digital MP3 Player 2.8 Inch LCD Display AM FM USB AUX Marine-grade Boat Audio System: The bluetooth marine radio with water-resistant IPX5 rating can stand up to water, humidKEMIMOTO KEMIMOTO UTV Sound Bar 18 Inch SXS Speaker RGB Wireless Control Bluetooth Compatible with 2X Tweeter and 2X Subwoofer Co Sync Your Lights to Music: The RGB multi-color lights on the KEMIMOTO Golf Cart sound bar flash in sync with the beat ofwet sounds Wet Sounds REVO 10 XS-W-SS Grill White w/Stainless XS Open Style Grill for The REVO 10 Inch Marine Subwoofer Rockville Rockville UT525B UTV/ATV 5.25" Rollbar Wakeboard Marine Speakers/Swivel/IPX6 Rockville UT525B 5.25" Marine UTV/ATV Roll Bar / Wakeboard Tower Speakers.H YANKA HYANKA BSF-12-2 Car Subwoofer Audio Speaker - 12 Inch Paper Cone, Black Steel Basket, Dual Voice Coil 2 Ohm Impedance, 1 【Powerful Sound】12-Inch Car Audio Subwoofer offers a 900W RMS & peak power of 1800W. The HYANKA BSF series of subwoofersSTINGER Stinger Audio MT-1000.1M 1000 Watt RMS 1-Channel Monoblock Marine Audio Subwoofer Amplifier, Class D, Water-Resistant, M 𝐃𝐢𝐠𝐢𝐭𝐚𝐥 𝐂𝐥𝐚𝐬𝐬-𝐃 𝐌𝐨𝐧𝐨 𝐁𝐥𝐨𝐜𝐤 𝐀𝐦𝐩𝐥𝐢𝐟𝐢𝐞𝐫: Packs a powerful punch with high efficiency and anVOXXBASS Waterproof Marine Gauge Stereo Receiver - Bluetooth Boat AM FM Radio - 2.8 Inch LCD Display MP3 USB AUX-in Subwoofer Pre IPX5 Marine Grade Protection: The marine media player is safeguarded by weatherproofing materials and UV-resistant coatiLiwogi Marine Boat Stereo Receiver, Waterproof Boat Stereo Radio System, Marine Digital MP3 Player, No CD Player, 3" LCD Displa HD DISPLAY SCREEN：Our marine stereo receiver has a 3" Crystal LCD Display for optimized viewing under all lighting and vPyle Pyle 4-Channel Marine Amplifier Receiver - Waterproof and Weatherproof Audio Subwoofer for Boat Stereo Speaker & Other W 4-Channel Marine Audio AmplifierVOXXBASS Bluetooth Marine Stereo Single Din - Boat Radio Receiver - Digital LCD Screen AM FM USB 2.1 A Charging AUX-in 4 Volts Pr BLUETOOTH MARINE MEDIA RECEIVER: With easy bluetooth pairing, you have the full access to make hands-free calling and stKENWOOD Kenwood KAC-M5001 Compact Mono Marine Subwoofer Amplifier KENWOOD KENWOOD XM502-1 Excelon Marine/Motorsport Mono Subwoofer Car Amplifier | 500W RMS | Class-D Design | Weatherproof & Comp Compact Powerhouse: The Kenwood XM502-1 is a mono subwoofer powersports/marine amplifier, delivering 300 watts RMS x 1 aPyle Pyle Hydra Marine Amplifier - Upgraded Elite Series 400 Watt 4 Channel Audio Amplifier - Waterproof, 12 volt, Dual MOSFE PREMIUM 4 CHANNEL AMPLIFIER: Pyle’s PLMRA400 is engineered as a 4 Channel marine amplifier that allows high quality sterVOXXBASS Waterproof Marine Digital Media Receiver - Bluetooth Marine Stereo with 2.8 Inch LCD Display - AUX USB Input AM FM Subwo IPX5 WATERPROOF PERFORMANCE: With a conformal-coated circuit board and a UV coating durable front panel, the marine gaugDOVOX Waterproof Marine Radio Stereo for Boat: Bluetooth Marine Digital Media MP5 Player with 3 Inch LCD Display AM FM AUX USB Boat Stereo with IPX5 Waterproof Design: The compact marine bluetooth receiver stands out with marine grade waterproof fSOUNDKITS SOUNDKITS Marine Radio Bluetooth Boat Stereo: Waterproof Marine Head Unit - FM AM Tuner Multi-Color Buttons USB AUX-in S 【MARINE GRADE WATERPROOF】:DOVOX Bluetooth Marine Gauge Stereo System: Waterproof Boat AM FM Radio Receiver - 3 Inch LCD Display Digital Multimedia MP5 P Marine-grade Bluetooth Stereo Receiver: The marine radio deck stands out with water-resistant IPX5 rating feature for duVOXXBASS Single Din Marine Radio Bluetooth: Boat Stereo Receiver - Push to Talk Assistant Digital LCD Screen AM FM Tuner 4 Volts BLUETOOTH MARINE AUDIO SYSTEM: With Bluetooth capability and built-in microphone, you have the full access to make handsCerwin Vega Mobile CV CERWIN-Vega! HED Series 6.5" 3-Way Coaxial Car Speakers, 4Ω, 60W RMS/340W MAX Power, Superior Car Audio System, Durable Cerwin Vega Advanced Design: Experience the epitome of sound with 6.5 inch car speakers from Cerwin Vega, offering superGeneric Mp3 Board - Car Subwoofer Amplifier | Module Accessories Radio Sound Speaker for Marine Voice Women Men Boat Home Theate Immersive Audio Performance: Achieves precise sound detail through advanced decoding, enabling lossless audio transmissiGeneric Car Amplifier Board - Amps for Subwoofers - Module Accessories Speaker Sound System for Motorcycle Marine Applications M Advanced Sound Precision: Delivers precise sound detail with advanced decoding for lossless audio transmission, ensuringGeneric Mp3 Board, Car Subwoofer Amplifier, Radio Speaker Sound System, USB Tf Card Audio Input, Voice Enhancer for Clear Sound, High-power amplifier for immersive sound: Designed for bass and clarity, this MP3 board enhances car audio quality withGeloo Geloo Boat Radio Marine Stereo Receiver-Waterproof Digital Media MP5 Player with 4.1" LCD Display For Watching Video, Wi WATERPROOF DESIGN：This marine stereo receiver features an enclosed full touch screen, waterproof design and UV coated maPLINIUS Amplifier car Audio Monoblock Class D Compact Subwoofer Amplifier, 2/4 Ohm Stable, Low/High Level Inputs, Low Pass Cross Car audio amplifier 450 watts RMS at 2-ohm load (14.4v); 300 watts RMS at 4-ohm load (14.4v);UCINNOVATE UCINNOVATE 8 Gauge CCA Wire 50ft (25ft Black+25ft Red) - Automotive Battery Cable, Power/Ground Wire for Car Audio, Mari COPPER CLAD ALUMINUM (CCA) Wire - Our 8 gauge wire set includes two reels of red and black (25FT/7.7M each) CCA batterySAVUK SAVUK Speaker Box Carpet Car Sub Woofer Trunk Liner Felt Black Fabric for RV, Boat, Truck, Automotive Interior, Marine, PREMIUM QUALITY : 3 mm thick Nonwoven Felt material. Soft touch, great looks, Durable using. Made finest fiber, %100 durDOVOX Single Din Marine Stereo Receiver: in Dash Bluetooth Boat Radio - Digital LCD Display Push to Talk Assistant AM FM MP3 S Bluetooth Hands-free Calls: This boat console stereo receiver has a built-in microphone on the marine headunit front panJAVEX 14-Gauge AWG JAVEX Speaker Wire OFC Oxygen-Free Copper 99.9% Cable for Hi-Fi Systems, Mixer, Amplifiers, AV receivers, H 【Exceptionally great premium speaker wire】 JAVEX speaker wire adopts 14-gauge 99.9% OFC (Oxygen-Free Copper), which offeFlushbay Flushbay Speaker Box Covering Carpet Black 39.37" × 39.37" Speaker Cabinet Subwoofer Sub Box Liner Carpeting Stain-Resis High Quality: Made of 100% Polyester fiber, resists stains, our non-woven fabric will not unravel extremely durable stanGeneric Subwoofer Isolation Feet | Amplifier Feet - Copper Anti-Slip Speaker Isolation Pad Enhances AMP, HiFi, Subwoofers, Audio Enhanced Audio Fidelity: Made from pure copper for optimal conductivity and stability, our speaker isolation feet effectZALHIN Subwoofer Isolation Pad, Speaker Pads Mats, Copper Anti-Slip Subwoofer Isolation Feet Improve The Sound of Your Monitors Unparalleled Sound Quality: Crafted from pure copper for high conductivity, these speaker isolation feet diminish electrGeneric Subwoofer Isolation Feet,Speaker Pads Mats - Non-Slip Copper Audio Isolation Feet Enhanced Stability for Theater, Audio, Eliminate Signal Noise: Expertly engineered with pure copper material, these speaker isolation feet effectively minimizeGeneric Speaker Isolation Feet,Amplifier Feet - Copper Non-Slip Speaker Isolation Feet for Audio Clarity, Theater Sound Improvem Enhanced Audio Fidelity: Made from pure copper for optimal conductivity and stability, our speaker isolation feet effect