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The Massive Audio HIPPOXL 104 is a subwoofer designed for car audio systems. It has a diameter of 10 inches, which refers to the size of the cone or diaphragm that produces the low-frequency sounds.
The term "Mega Subwoofer" likely refers to the subwoofer's ability to produce deep and powerful bass frequencies. With its large size, high power handling, and robust construction, it is designed to deliver impactful low-frequency reproduction in car audio systems.


The subwoofer features a 3-inch voice coil. The voice coil is a wire wound around a former that sits within the magnetic gap of the subwoofer's motor structure. It is responsible for converting electrical signals into mechanical vibrations, which in turn produce sound.
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Just purchased two of these and have them installed in my 2014 crew cab. This thing is a beast. Hits hard and very heavy too lol! Now I know why Massive Audio named their subs “Hippo” and “Summo”. I highly recommend them.
Honestly, the only thing I don't like is the lack of terminals but that is a very minor thing. Grabbed three of these while the sale was going on and have wanted to give Massive a run for a long time. Was gonna give the Kilo a run to see if the brand was for me but being a penny pincher honestly was the reason behind that and with the sale this summer, I'm glad I decided to give Massive a try. @ of these half-powered run just as hard as the 2 Type X X-W10D4 subs they replaced. Only ran on the kilo for a few hours altogether but it was no disappointment either. With 3rd sitting in the box and a severe lack of power issue, the sky feels like the limit, and I'm glad these are what I went with. After 20 years of buying nothing but Alpine I wanted to step outside my comfort zone and am glad I did with these. Obviously Alpine is no joke but neither is Massive in my opinion and am excited to get a new box built to house them at proper power.
The bass performance of this impressive 10-inch sub from Massive Audio is truly remarkable. It effortlessly handles the substantial power I'm feeding it, and I wholeheartedly recommend it. Pair it with a quality amp to drive this colossal subwoofer in a single-ported enclosure, and the results are nothing short of astounding. This setup is a bass enthusiast's dream come true.