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HDC3.112 Copper Coil Subwoofer
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HDC3.112 Copper Coil Subwoofer

Item Id: HDC3.112
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The HDC series isn’t just some off the shelf woofer designed in the virtual world.  It is the product of over two years and hundreds of hours of real world research and development. Many of the HDC’s features are only found on woofers costing twice the price. When compared to our competition the HDC series woofers have more cooling, more throw, more motor force, and stronger cones. These woofers work great in everyday street beating or all out gut wrenching SPL builds. We have spared no expense to give you the best subwoofer value on the market today.

HDC Coils

The HDC comes with your choice of  a four layer, round wound, dual 1ohm or dual 2ohm copper coil.


Suspension systems are generally a weak link in a woofer design, and often the primary reason for woofer failure. Over time, especially in high power applications, suspension begins to sag and as a consequence it can no longer control the voice coil’s movement. This generally results in a torn suspension or smashed voice coil.  To avoid this we use a multiple spider configuration engineered to maintain rigidity over extended periods of heavy use. We also hand glue our triple joints to allow for better glue penetration and saturation of the high stress areas. 


High excursion subwoofers require a lead wire system that doesn’t flop all over the place or break. We use the direct connect system (no terminals) because it works the best. With our direct connect system you get no annoying lead slap noise, no rips or holes burnt in the spiders, and no flimsy lead-in wires.

Note: Parameters taken of random single sampling of NIB subwoofers with no pre-break-in.

Model HDC3.112
Woofer Size 12"
F(s) 43 Hz


Q(ms) 7.313
Q(es) 0.305
Q(ts) 0.375
V(as) 20.33 liters (0.717^ft)
L(e) mH
n(0) %
Sensitivity 1W/1m 88.172db 1W/1m
Xmax 36mm
Magnet Weight 340oz
Coil Diameter 3.0"
Coil Length 54.229mm
Usable Throw 68mm
RMS Power 1500W
Peak Power 4500W
Mounting Depth 8"
Circle Cutout 11.25"
Outer Diameter W/Gasket
We recommend allowing several weeks of playing time to break in SQ Woofers, full break in may take many months. DO NOT  play subwoofers at max amplifier power in the first couple of days, give the suspensions a chance to loosen up. As the suspension breaks in, the subs will play lower and louder.

Product Specifications subject to change without notice.

Aluminum coil versions are made as ordered, Allow 5-7 working days for build time.
Customer Reviews View All Reviews
Rating 2010 chevy malibu
I got a 145 out of 1 of these 12s in my trunk, loudest 12 I've heard I ran 1 sq hdc3 12 on a hifonics brx 2000.1d with a 320 amp mechman alternator and a kinetik hc2000, all 0 gauge big 3 and front to back, box was roughly 2.8 cubes after displacement, 5 inch L port 15 inches long, 42 hz it peaked at, long story short thumbs up to soundqubed, buy this woofer it is well worth it
  Reviewed by:   from Minnesota . on 12/30/2015
Rating Best Subwoofer HANDS DOWN, VERY impressed PERIOD, BUT IT
I have been in car audio for over 20 years now and have used almost every brand, from old school soundstream to Precision power art, JL audio, KICKER, Old school Orion, Kenwood etc. This SUBWOOFER for the money is by FAR better than any mainstream subwoofer. This one 12 inch sounds like two JL 12s easily. Destroys the Kicker COMP Rs I had running before. I matched this one sub in a custom enclosure with a Soundstream 1500 watt RMS amp, and it doesnt break a sweat. It is so clean, it rattles every bone in your body and the key here is it is CLEAN. Also not power hungry at all, compared to the Kicker and JL subs. Stock alternator, high quality battery, but no problem eats up 1500 watts and loves it. This is the most impressed I have ever been in a car audio product in my life. I havent had it long, so will see about durability, but from what I can see so far, not much would beat this for the price. Hell of a job soundqubed for life now.
  Reviewed by:   from Laurel MD. on 12/17/2015
Rating 2 SQ HDC3 12s
These subs are extremely underrated. They can take much more than what the recommended power is. The are the most clear subs I have ever owned. These things come super stiff are extremely loud out of the box, but every day I can hear them getting louder and louder.
  Reviewed by:   from Austin, TX. on 10/13/2015
Rating Worth every penny!
Just picked up a pair of these. They are beasts. Put them in 5.4 cubic feet tuned to 36HZ. It hits hard. Even with the tuning a little higher than I normally do it CRUSHES the lows. I am feeding them 3200RMS but I am sure they could take more.
  Reviewed by:   from Sonoma, Ca. on 10/10/2015
Rating Hits hard and low
This sub is amazing. Hits the lows great and still has great quality. Can't beat it for the price
  Reviewed by:   from Michigan. on 9/18/2015
Rating Great Sub recommended to anyone very loud and clear
I put in my hdc312d2 little over a week ago got it wired to 1 ohm on 1500 watts and it slams I do alot of driving so alot of booming to everyday gets louder still a long time breaking in to do but love it got it in 2.5 cube box in a dodge dart turns it into a tin can lol. This suspension is wicked stiff when the sub arrives but stating to loosen. The direct connection leads are awesome as well of no extra cost IT dose make a difference. Iv had many subs range from $30 to $600 and I got to say this Soundqubed is the BEST Bang for your Buck!! For $239 sale and $279 and performance of a $600 subwoofer in my opinion! Plan to buy more for my vehicles also great Soundqubed decal for Ur Windows. If Ur debating on SQ subs like I was for a long wile get some u won't be disappointed!
  Reviewed by:   from Salisbury Maryland . on 9/5/2015
Rating 12s Killin it!!!!
Im really not much into 12s. I love 18s an 15s for really low bass. but eventually want to run 6 of these on like 12-15K. well I built a tube ported fiberglass box that ended up like 6.6 cu. ft. net an hit lows great but not super loud. so few days ago I built a smaller 4.75 cu. ft. seems to be around 42 hz. an it can make ur nose feel wobbly like in back of 01 Tahoe on Skar Sk 4500. I highly recommend these or any soundqubed subwoofers for hard loud great sounding BASS!! I own pair of hds3 12s also.
  Reviewed by:   from Gainesville, FL. on 8/27/2015
These have got to be the best sounding subs I've ever used, bar none! Especially for the price, its unbelievable! I still can't believe what you get for the price of these things. The build quality of these drivers is great, they're heavy and you can just see all the attention to detail in the stitching and wiring. I've been running just one HDC3.0 12" for a while, on an underpowered amp with a box that's too small. Still sounded better than the two 12" Kicker CompVRs I was running previously. I decided it was time to quit playing around, and get serious. I pulled the trigger on a second HDC3.0 12", along with a large 5.0 cubic foot dual 12" box port tuned at 34hz, and a new Hifonics Brutus BRX3016.1D amplifier. This is all in a 2011 Crown Victoria LX. I've got the trunk and deck sound deadened, along with a Pioneer touchscreen head unit, Infinity coaxial interior speakers, and an AudioControl OverDrive Plus line driver. I suspect once I get the system all installed and dialed in, I'll be banging the loudest system in my neighborhood....LOL. Soundqubed FTW....the MF WIN!!!!!!
  Reviewed by:   from Chicago, IL. on 8/25/2015
Rating I love SQ
I have one hdc3 12 dual 1 wired to half ohm on a Q1-2200. I haven't even broke the sub in or turned my amp up and this system slams harder than any others I've ever had. You can't beat the value that you get with soundqubed. SQ FTW.
  Reviewed by:   from Greenville, SC. on 8/16/2015
Rating Amazing but,
These are the loudest speakers for the 2 and paired them with an soundqubed 2200w mono amp and they are amazing,but they are so loud they will rattle everything so I suggest buying their amateur which fixes the entire rattling and makes them sound even louder
  Reviewed by:   from Wi. on 5/22/2015
Rating Subzer0
I bought air of D1's at the beginning of March. I just got them in my car yesterday. Running them with a soundstream rub1.2500 at 4ohms. Clamped pushing 1054 rms or so in an Atrends box. These things move some serious air and I haven't even scratched the surface or broke the subs in. I have another rub2500 and will be running them strapped with 4 kinetic hc2000's and an Orion xtr4r crossover. (Switching to 2 orion xtr2500's when readily available). 3400rms will put these things through their paces. These destroy my phoenix gold Ti elite 12's. A must buy for bass heads at an awesome price point. Keep it up SQ and u may be shipping 2 4.0's next yr.
  Reviewed by:   from Rochester N.Y.. on 4/19/2015
Rating HDC 312 D2
Got a single d2. Built a bulletproof 2.5 ft net enclosure tuned to 36 hz, 40 sq in. of port area. Powered by an old school Cadence Ultrashock 1200 watts@ 1 ohm wired parallel. For the money best 12 I've ever heard. Not even broken in yet. Been doing this 20+ years...this thing is shit nasty.
  Reviewed by:   from Indy. on 4/16/2015
Rating low end monsters
I bought 2 of these for a customer who wanted to stand out. I built him a very efficent 6th order and put them on a hifonics 2400 brutus and wow. these are air movers and not even broken in! im sure once they are broke in they wil be able to hairtrick and thats from a trunk. for being so massive they are very musical which also has alot to do with enclosure but none the less I love em.
  Reviewed by:   from texas. on 4/9/2015
Rating hdc3 single 12 just pounding
Got this sub about two weeks ago and it just gets lower and louder every day got it on my digital designs m1c amp birth sheet says 1,824@1ohm I been a audio addict for about 8 years been threw JLaudio alpine type r 15s,kicker L7s,,re audio se pro series, sundown audio sa series and a few others. Every brand that I named I always had 2 subs this is my 1st time getting a single sub and it is amazingly loud deep and just hard hitting chest and throat shaking bass with alot of power.i thought this dd amp would blow this sub like my re subs and my sundown subs this sub don't distort get hot or smell on a single 12!! so I know I need a bigger amp best sub I owned and I'm down and only gonna bump soundqubed now..
  Reviewed by:   from Phoenix , Arizona. on 3/23/2015
Rating Didn't go wrong here
Gonna make this short and sweet but after getting these subwoofers hooked up, it was worth every penny hands down. Outstanding piece of car audio Soundqubed is able to provide!!
  Reviewed by:   from West Virginia. on 3/19/2015
Rating 2013 Toyota Camry banging
I ordered two of these subwoofers and let me tell you I don't regret getting them I have them in a trunk wall build tuned to 27hz........I know what you're thinking that's low but they can play lower than that they also can handle lots of power even more than the max wattage and you get these subwoofers at about half the price of the next top brand name subwoofers and you get free FedEx shipping it usually takes 3 to 5 days to arrive after being purchased GREAT PRODUCT AND OVERALL GREAT COMPANY SOUNDQUBED FTW!!!
  Reviewed by:   from Forrest City AR. on 3/19/2015
Rating very impressed
So after looking at these and reading reviews on them for almost 3 years, I decided to give them a try. I've read alot of people saying that these woofers didn't like to play low, and after having them, it's all about how you set them up. My trunk build right now peaks at 30hz, these hdc's are killing everything from 26-34. Even with porting not being right for them. Can't wait to rebuild and see how they do. These are very very solid woofers With an outstanding price. When I received mine I was shocked at what I got for 280$ a piece. Build quality is awesome! If you have the space for these, you can't go wrong.
  Reviewed by:   from Phoenix az. on 3/6/2015
Rating No love in MO
I use to run Fosgates and I was all alone. The I heard about SoundQubed subs and amps. 4 HDC3 12's later I am beating the woman off with a stick! Now I am breaking windows and hearts with my HDC3's. Thanks SoundQubed!
  Reviewed by:   from Barnhart, MO. on 2/6/2015
Rating S10 gettin loud
Amazing sub!!! It's in my s10 in a 6th order bandpass first chamber is 2.1ft^3 tuned to 58hz firing into the front chamber that 3ft^3 tuned to 33hz. I have it on a hifonics Brutus 2200.1 at 1ohm on 0ga electrical. Right now on stock battery and alt but upgraded those soon. But this is the best and loudest sub I owned yet. Definitely gettin three more next year for a wall build. Recommend to anyone and Zach knows my buddy Brandon Henley really well which is a big plus!! Thanks for the great quality and price soundqubed!!! Soundqubed FTMFW!!!
  Reviewed by:   from Forrest city Arkansas . on 9/7/2014
Rating Best Subwoofer Purchase EVER
Honestly, if you have the money and time to do all the work of wiring, building a box, and hooking up these woofers, BUY THEM. It cost me around $1200 to get everything i needed for this upgrade so my car would function properly due to the large power demand, but THESE THINGS TURN HEADS ON THE HIGHWAY!!! Do yourself a favor and buy a pair of these.
  Reviewed by:   from Sartell, MN. on 8/29/2014
Rating HDC3 IS GREAT!!!
I bought this subwoofer with high hopes and had it powered off of an AQ1200...and it hit pretty well and everyone was impressed. I now got the newer SQ Q1-1200 which is the same thing different name, and strapped them to one HDC3...WOW This thing is ripping my car apart, make sure you have great electrical for this thing because this sub is POWER HUNGRY!!! 5 stars all the way
  Reviewed by:   from Fort Campbell KY. on 8/7/2014
Rating Impressive
Finally got my hdc3-12s hooked up for couple months now and man these things are loud and reasonably low. They are getting pushed from a aq2200d. I am happy with it all now I just need to install the q-mat it got today.
  Reviewed by:   from Pittsburgh PA. on 6/22/2014
Rating Blow Thru BANGIN!
All I have to say is holy crap! These beasts are AMAZING! running two of these on an AQ 3500.1 and just rips my truck apart. Best products I've ever ran.
  Reviewed by:   from twin Cities, MN. on 6/14/2014
Rating all smiles
Best sub I've ever owned. This thing at half power hits harder than my rock fords I had. I love everything about this sub. Flex is amazing the lows jus make your smile from ear to ear. Buy this you will not regret it.
  Reviewed by:   from springfield. on 5/31/2014
Rating Sh!# Got Real!
When I ordered this Woofer I don't think I realized what i was getting myself into.... My 2200.1 is coming soon. A complete electrical upgrade is necessary If you want to wake this thing up.
  Reviewed by:   from Charleston, SC. on 5/24/2014
Rating Amazed
For quite some time I had been shopping for the perfect setup. I bought one of these because for the price, there isnt much out there to compete. I have had so many variations and setups over my years and nothing, not two 15s, 3 12s or anything I have ever had hit as hard as this sub. Apparently, it can handle much, much more. I have mine on 1 q1-2200d and it destroyed my ported box I had built for it. I think the guys might have underestimated this monster. I cant imagine adding another q1-2200d to this beast, it would be absolutely savage. If you are looking for a sub that does not hit, it kicks like a bucking bull, this is your sub. It gets lower than the two 15s I had. It is such a powerful sub I love it!
  Reviewed by:   from Fla. on 5/17/2014
Rating HDC3.112
purchased 2 of these to replace Alpine Type R, running at 700 clamped RMS. raised SPL from 136.2 to 142.8DB sounds great
  Reviewed by:   from Colorado. on 5/8/2014
Rating awsome sub
I purchased 2 of these subs and wow. they pound the lows and have great sq also.
  Reviewed by:   from ne. on 4/29/2014
Rating 3 hdc3 12s MONSTERS
Recently purchased 3 soundqubed hdc3 12s and my goodness they are monstrous. Got them wired to .67 on my nendo 5500 and it slaps hard. Lows are just as painfully loud as the highs and the build quality is of top notch. All the glue joints are exquisite and nothing bad can be said about this woofer. For the price you will not find a better built, better sounding or louder sub, guaranteed. If you are thinking about purchasing one, ask yourself why just one? And get 3 like I did :)
  Reviewed by:   from Bass head . on 4/4/2014
Rating These are the best subs I have owned
These subs can handle some power!!I have 2 HDC12 dual 2 on a DC 5k runnin .5 an man they handle it!! They are amazing subs well worth the money!I recommend the hell out of them..People still can't believe it 12s...Hell I can't ..Great product Thank you Zack for the quick shipping.. also the more you play um the louder an lower they do get!!!LOVE THEM!! AQ FTW
  Reviewed by:   from Virginia. on 3/17/2014
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