15s that hit really really low

Be careful tuning to low you will miss out on some of the top end bass like 50htz and up If i were you i would stick to 33-35 htz range seems to be all around level
i usaully cut my subs at 50-60hz down anyways, from there up is for your door speakers, they are called SUBwoofers for a reason

 
i just looked at RE website looks good the se is 600watt as well but is recommended to be tuned at 34hz. what is the Price range on the RE se and anyone got any input on what would be better from the stat sheet Re but i have done no research on them the SDC2.5 have heard alot of good thing about the quality and reliability plus great customer service but just not sure 100% want to make sure i do the right move

 
Be careful tuning to low you will miss out on some of the top end bass like 50htz and up If i were you i would stick to 33-35 htz range seems to be all around level
no he is saying the lower you tune the box the less higher sound the sub will be able to hit. A sub only hits a certain range if you place the subs in a box that plays them lower then the highest hit will be lower if you get what am going at it does not disappear just out of range. Not an expert so if i mislead anyone feel free to correct me
All tuning lower does is get you a flatter response graph. It will be a lot less peaky on higher frequencies. I tune some of my boxs(depending on driver) to 28hz.

Almost every sub woofer is capable of playing the lower frequencies.

I think the OP is majorly concerned with "low end extension". If I were you I would search the forums for this. Try and find a good low end monster. Personally my Fi Q was great for this.

 
Reading through your previus threads as well, I say just get the aq2.5's, i think you'll be happy with them.

Don't worry about them not getting low....believe me, they do. I'd tune to 35.

RE SE's would be a good choice as well, but you might not get as much output.

 
Like I told you in your other thread, have more patience, stick around here a while to at least learn a little bit, and then make your own educated choice rather than guessing someone else will give you the best suggestion. Even your question of what subs hit really really low suggests you dont know enough to ask a specific enough question. People who dont know much/anything about subs pretty much all suggest they want super low bass. That really doesnt tell us much, and you are mostly gonna get guesses and half-educated responses. I doubt any decently knowledgeable person here would take your question and simply respond with you need 'X' subwoofer. If they dont ask you to provide more info, you can be confident their answer is half-assed. If you are willing to take that chance with your purchase, by all means run out and buy subs in the next couple days based on what some strangers suggested would be best for 'really really low bass'.

 
no he is saying the lower you tune the box the less higher sound the sub will be able to hit. A sub only hits a certain range if you place the subs in a box that plays them lower then the highest hit will be lower if you get what am going at it does not disappear just out of range. Not an expert so if i mislead anyone feel free to correct me
What's a "highest hit"?

 
From what I've heard the RD audio Alpha murders the lows. Not sure why people keep recommending the HDC3 when the recommended tuning for that sub is like 38 hz.

 
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