5 Core 8" Full Range Subwoofer Car Audio Speakers, RMS 40W Peak 400W, 4 Ohm Car Vehicle Audio Full Range Drivers, Wide Range DIY Loudspeaker Woofer Replacement Black SP 872 B - Walmart.com
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Monoprice 40-watt 1x10 Guitar Combo Amplifier - Black With Spring Reverb, 10in 4-ohm Speaker, High & Low Inputs, Headphone Output For Electric Guitars : Target
Yamaha 8 ohm 40 watt 12 inch speaker
Amazon.com: 5 CORE 4 inch Speaker Driver 40W 4Ohm Replacement Full Range Audio Stereo Dual Cone Concept for Extra Crisp Sound Made in India (Pair) : Electronics
GCP Products GCP-US-575708 40 Watt Electric Guitar Amplifier Solid State Studio Amp With 8 4-Ohm Speaker, Custom Eq Controls, Drive, Delay, ¼ Passive/A…
Amazon.com: 5 CORE 4 inch Speaker Driver 40W 4Ohm Replacement Full Range Audio Stereo Dual Cone Concept for Extra Crisp Sound Made in India (Pair) : Electronics