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Home > Subwoofers > HDC 3.0
HDC3.112 Copper Coil Subwoofer
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HDC3.112 Copper Coil Subwoofer

Item Id: HDC3.112
review 52 Review(s)
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Your Price: $279.00
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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.
Woofer Size10"12"15"18"
Fs41 Hz43 Hz38 Hz31 Hz
Vas9.168 Ltr20.99 Ltr70.421 Ltr109 Ltr
Sensitivity 1W/1m84.439 dB88.172 dB91.532 dB89.8 dB
Magnet Diameter8.7"8.7"8.7"8.7"
Magnet Weight340 oz340 oz340 oz340 oz
Coil Diameter3.0"3.0"3.0"3.0"
Coil Length2.135"2.135"2.135"2.135"
Useable Throw3.0"3.0"3.0"3.0"
RMS Power1500 W1500 W1500 W1500 W
Peak Power4500 W4500 W4500 W4500 W
Mounting Depth7.625"8"8.875"9 3/4"
Circle Cutout9.4375"11.375"14.0625"16.625"

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 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 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 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 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
Rating perfect!!
I've owned many subs and these are by far the best. They hit lows highs and still have good sound quality. I would put these up against my old mtx 9500 12's or the orion hcca 12!!!! Ithey hit so hard and I was really amazed by the size of them. Subs that sounds as good as these and can take the power they can are are twice as much. Buy you will not be disappointed.
  Reviewed by:   from texas. on 3/8/2014
Rating BIG FAN.
I absolutely LOVED my HDC3 12's! By this point, I've already sold them and gotten a pair of HDC3 18's, but I ran the 12's for over a month and loved every minute. They took 5kw daily like champs and did fairly large hairtricks, all while under windowline. They broke my poor car's hatch in 4 places, and necessitated the implementation of a stripper pole to keep my roof from flexing almost 2" peak to peak. I highly recommend these woofers to anyone who wants the most for their money. Great work, guys!
  Reviewed by:   from Tallahassee, FL. on 2/20/2014
Rating Banger!
First off put this beast in a 2.6 Cu.Ft. Ported Box. Then ran the 10gauge into a crap Pyle Pla2988 which said 6000 watts. Only to find out it RMS's at like 500Watts. I then swapped it with a Hifonics Brutus Brx1600.1d And damn this thing is crazy! It rattles and shakes my whole car. I have to dynamat because this thing is a beast! 5 Stars SoundQubed. Ill be back to get another someday!
  Reviewed by:   from Anaheim CA. on 8/8/2013
Rating hdc3 12"
I have two hdc3 in a 4th orderbandpass box tuned to 45 hz. Men can play low and loud. I like the way they sound. Thinks soundque for making great subs for a great price.
  Reviewed by:   from Danville Va.. on 7/21/2013
Rating HDC312 Dual 2 On AQ2200
Got a single HDC312 on an AQ2200 in a Colorado Crew Cab. Tons louder than anything I've owned before from; polk, infinity, RF, alpine, PA. They are in a 2.2 Gross enclosure with a 4" aeroport dimpled and flared on both ends tuned to 32hz. They like higher tuning but I like the lower notes for now until I can get my other enclosure built. I don't have near enough port area and it still makes the roof of my coli flex. The subs get really low don't let the fs fool you they get low and stay clean, especially with clean power. These things are also extremely heavy. No joke quality build. Only complaint is I wish the wires were longer. No regrets though get one!
  Reviewed by:   from Las Vegas. on 6/29/2013
Rating Great Subs!!!
Purchased 2 dual 1ohms, have them seriesed to a final 1 ohm on a Hifonics BRE2100.1d. Box is 4.0 cu. @ 36hz. After a few weeks of break in these babies just got better, and better. My amp is no match for these subs, as I upgraded from type r's that were starting to smell with my Brutus. They need more power, and these are not just spl. The sq is far more than expected. I plan on upgrading to the SQ3500 when funds allow but you will definately enjoy every bit of these subs. Thanks SQ for making my ride sound completely amazing!!!!
  Reviewed by:   from Independence, MO. on 6/25/2013
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