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None at all. They drop so low that my heart misses a beat. My girlfriend says she enjoys the free massage while we are driving. I can imagine putting them in a ported box (you won't be able to breath) & these are only 10 inch imagine the 12 inch.

If you listen to techno or house music these speakers are not for you. They don't have that bang you need for this music. They sound excellent with reggae, hip-hop & R&B.

I have 2 of these 10 inch subs & let me tell you they may look small in the back of my car but looks are very deceiving. I have them in 0.75 sealed boxes with loosely pack fibrefill. I recomend a sealed box for these as the bass is low enough & gives you more natural sound & control. I started running them with a Hifonics Gemini amp but it only gave them 100w rms per channel. I have now upgraded my amp to a JBL BP600.1. These 10's kick ass! Just when you think they've reached their limit - turn the knob up more & you'll be amazed! These little beauties can take some power. I now have to upgrade the amp for my mids & tweeters as I can't hear any lyrics. Buy them you won't be disappointed!

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I only used to use 15 inch subs various models ie. Rockfords etc. My 10's have changed the way I view subwoofers.