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I replaced my Soundstream sub with this Hifonics model and ran it at 8 ohms with 240rms on Tap.  The box is 1.8 cu ft tuned to 40hz, a bit bigger then the recommended 1.6 cu ft but the tuning port is same. 

The subwoofer seems to be very good performing sub, but I have noticed at certain frequencies the plastic covering seems to rattle and the sound was eminating from the port.  This is usually at high volumes and with a lot of cone movement.  Will see if I can take the plastic casing out from the back.  The sub has good excursion limit and the only drawback is the rattling.  For an entry level sub, the manufacturers have spent money on its mechanical factors and it matters the most.  Just follow the manufacturers recommendation with box requirements and I am happy with the result.  A great buy for an entry level sub that performs very well. Another downside is the effecieny of 87db /1mtr, you will need a good amp to drive it.  Highly recommended as an entry level subwoofer!!! 

Well i will start off for the sound these things beat good, but i will say at certian hertz the plastic back will rattle but at low hertz it doesn't. I put 300-325 into it for about 45 at loud volume (the only way i listen) and it smoked don't really know if i got a bad speaker or just too much power. But we will see im sending it back and will write another review when i get mine back. Oh and the terminal holes are kinda small for sub gauge wire... Just FYI

i had written a previous revew for this speaker, but now i realize it's not as good as i had previously thought. still a great starter speaker. and it hits hard right out of the box, but it wont last, if pushed to it's rms watt on a reguler basis, expect to clip the voice coils in a couple months, i drive a tuner car and dont want 400 lbs of stereo in the trunk, so i generaly buy one sub and push it at it's limit, this sub only handled about 350 clean watts for a couple months. now thair trash. but if your not worried about weight two in a big box @ 400-500 watts rms would make for a clean reliable system at a great price.

not too bad for 50 bucks a pop. it only has holes in the terminal for 16 ga. wire that kinda sucks. running 2 off a memphis pr1.500 wired to 1 ohm and they do work, not too good on the lows. i got these to replace the 2008 boss audio diablo 12s i had and they hit way harder than these do. not too bad tho

i have 2 of these HFI12D4 monsters hooked up to a "planet audio 1000.2" bridged @4ohm (700rms)...so 350rms to each, in my grand cherokee...unbelivable..i thought id blow them but they handle it perfect....ive had some top name brands and these are awsome for $30 subs....i was on a budget and wanted to replace my JLw3's i had...SO I READ THESE REVIEWS AND TOOK MY CHANCE....SO GLAD I DID...the only 12's ive heard sound as good as these were my JL's ,and orion XTR, ....and they all cost me over $125 a peice at the time....i call them monsters because the bass is crazy loud...it shook my fog lamps loose (so they pointed down)on my front bumper and makes my wiper bounce off my rear window with just 2 of them ...you cant go wrong with these...im about to upgrade to 4 of them and a "planet audio ac2000.2"...(700rms X 2)....2 more subs and amp will cost me $180....so for $300 i got one hell of a system that will blow away most $2000 systems...lovin it.....but since im not 17 anymore...i dont need 4-12's, 2-15's, and 2-10's to be cool anymore......but you be heard from half a mile away,set off car alarms, and.. WILL GET A NOISE POLUTION TICKET WITH THESE SUBS.....ha ha....PLAY AT YOUR OWN RISK

i have four of these in a bandpass box on a 2000 watt hifonics brutus and they hit hela hard they cant get low in the box but they have broke three screws that hold the plexiglass in

Well worth the money.  Have 2 in my Ford Ranger XLT, wired at 4ohm bridged into a  Kenwood KAC-8105D and it is VERY, VERY, VERY loud.  Have one in the trunk of my GF's Dodge Stratus with a JL Audio 250/1 wired to 2ohm and its nearly as loud as my truck!!!  WELL WORTH THE MONEY!!! HIFONICS IS A COMPETITOR!!!

i have four of these speakers on a  rockford t10001bd and they hit pretty hard not very good on low end bass but they say u get what u pay for and thats the truth when it comes to these speakers but for the price u cant go wrong overall a decent sub

this is a great deal!! this is the best sounding speaker for the price i have ever bought, and i have bought a lot.  i was running jl wo10 and sound quality was great but the low power handling led to clipped voice coils. i bought this as a cheap replacement just for right now, i dont think im going to need to upgrade.

im running it in the same 1.25 cft ported box the wo's use witch is a little small. but i preffer this as it adds more punch. bridged at 2 ohm. with a one farid capasitor.  running on a planet audio 2 ohm stable amp at around 300 rms. 

i am super impressed, i love jl audio but i also love my money.  im going to buy a couple more to put in the closet, cuz my freands are going to want some too.  but im gunna charg them $75!! ha ha! 

I had two of these Hifonics in my 1999 Merury Cougar in a sealed box, hooked up to a 1000 watt amp, they hit pretty hard, I would say for the money they are great subs. They are super lightweight too which is always a plus.

I bought 3 of these. Put them in a 6 cubic foot sealed custom box. Infinity 1600 watt Monoblock wired in a series down to 2.7 ohms. And It slams I am getting roof flex and door flex like mad and havent tuned the amp to its full potential yet so it will get louder. The subs are great slam harder than anybody in my area at the time so I would say A+++. You can see them on youtube.com. U will not be disappointed.

http://www.youtube.com/watch?v=WumrdALZ7pA

i never have used highfonics before, i just bought them not know any thing about them one thing i can say im impressed,i have 2 12 hf in a sealed box in a 96 honda accord,on a 500.1 kicker amp mono block,they sound great,best bang for the $$$,for the price u cant go wrong,u dont need a big amp,just do ur math,for under $230 u can have a hell of a system.a kicker 500.1 mono push great.u can get a kicker 500.1 for $120 two subs for $70 box 25-35,ur ready to go.