Your Price: $499.00
Part Number:HDC418-D1-A

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SoundQubed introduces our competition grade subwoofers with high power 4 inch voice coils. The HDC-4 subwoofers feature our largest and most powerful motor ever, coupled to a new frame and suspension system.

The 9.25 inch diameter multi-layer spider system with integrated lead wires provides well controlled excursions needed for advanced box tuning. The high gap flux powered by the triple stack, 10 inch diameter magnets add extra control while increasing sensitivity. Our laminated kevlar cones are used due to their excellent strength and durability.

The voice coils are high temperature flat wire aluminum on black anodized aluminum formers. 10 gauge Direct Connect wiring is used to lower resistance and make multiple wire connections as easy as possible.

The HDC-4 subwoofers are setting new standards for heavy duty applications where good sound and high power are needed.

Model HDC418
Woofer Size 18"
F(s) 27.59 Hz

Q(ms) 6.053
Q(es) 0.478
Q(ts) 0.443
V(as) 48.450 liters (1.711^ft)
L(e) 0.176 mH
n(0) 0.3713 %
562.9 grams
0.059 mm/N
Sensitivity 1W/1m 1W/1m
BL 10.9
Xmax 40mm
Magnet Weight 403oz
Coil Diameter 4.0"
Coil Length 54.356mm
Usable Throw 69.85mm
RMS Power 2000W
Peak Power 6000W
Mounting Depth 9.75"
Circle Cutout 16.625"
Outer Diameter W/Gasket

PLEASE READ: In the pursuit of offering the best in DIY car Audio we ask that you read about clipping, what causes it and what the outcome is. 
5 Stars
So I bought 2 HDC4 18,s put them in individual boxes of 6.5 cf tuned to 35hz ,powered by a MB Quart 3000-1, wired to 2 ohms for break in and I dont think I'm going to wire them to 1,because its louder than hell,zero muddy bass,extremely tight,monsterous sound. It redefines what bass is. If you want car alarms going off every where you go,people giving you room during rush hour traffic,having folks bitch at you for knocking stuff off their shelfs,,buy these subs. I'm a SQ for life fan after owning a set
Did you find this helpful?  26 of 27 Found Helpful
Reviewed by:  from Portland Or. on 2/21/2016
5 Stars
Straight Knock
This sub is amazing. I sold two w7s to move onto this sub and it actually beats them in sound quality. sound qubed recommends setting your low pass filter to 100-125 hz and i have mine set to 100hz on a kicker zx 2500. I had a local guy build me box for the ford ranger ranger I have and wow. 6 cubic feet tuned at 37hz. huge port sub sits right behind me seat. This sub is hands down amazing. It gets into the high notes really well and just murders the lows on decaf music. A true head turner, people look at you like wtf?? I'm only feeding it 1500 rms right now 54.7VAC @50hz @ 2 ohms, not even calculating in box rise and its just a monster. After break in ill turn the gains up. Some guy pulled up next to me and asked me to put together a system for him, haha thats how you know you dont sound like dirty rattle and ugly noise. straight knock fell in love with this sub.
Did you find this helpful?  15 of 16 Found Helpful
Reviewed by: (Verified Buyer)  from Long Beach California. on 6/7/2015
5 Stars
Buy these subs! You are wasting your money if you don't...
My previous system consisted of 2 hifonics brx 2400s strapped on 2 sundown x 18's in a 12.5 cube box tuned at 32hz. I recently upgraded to 2 Q3500s when they were on sale for $600 and 2 of these in a 12.5 cube box tuned at 37hz. Don't let the high fs number on these fool you. Even with the much higher fs and higher tuned box these things get every bit as low as my x 18s did, sound better imo, walk all over them in terms of output and cost 20 bucks less per sub. You will not find a sub anywhere close to being on this level in this price range... It's just not going to happen. If you are building a serious system and you want to get the most for your money then you gotta buy soundqubed. I guarantee you will not regret it. By far the best deal in car audio.
Did you find this helpful?  10 of 10 Found Helpful
Reviewed by:  from Austin, Tx. on 3/28/2015
5 Stars
155+ on music with 3
I do 155 + on music sealed dash score with 3 of these and 3 Soundqubed 3500.1s ,beast subs if used correctly
Did you find this helpful?  6 of 7 Found Helpful
Reviewed by: (Verified Buyer)  from Jackson mi . on 7/8/2016
5 Stars
This thing is a MONSTER!!! It is replacing my previous (2) 12 setup and it is MUCH LOUDER than the 12's and of course a lot lower, all with pretty much the same power if not less. I currently have it in a 6.5 cuft(net) vented enclosure and its tearing my car apart! For power I have (2) Taramp HD8K's(both wired down to 1ohm) and the HDC18 handles it well. During some SPL testing I clamped a little under 8000watts(both amps combined, after rise) and it handles it well. Im very happy with the purchase, and compared to the other big names out there I would pick Soundqubed again, hands down!
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from VA. on 5/18/2016
5 Stars
Fiat Propulsion
So far so good. Very stiff subs as I have only had them playing less than a week but I am truly impressed. I ordered 2 hdc4 18's and they arrived within a week. Build so fresh, you could still smell the glue. That sat in the garage for 2 weeks beckoning out to me everytime I walked past. I had to reassure them there was a time and a place, there home was not finished being constructed. The long wait paid off and they are performing as expected. My current port is tuned at 46 hz with a port area of about 17 in2/ft3, leaving me about 12.2 ft3 net. I works wonders on anything above 40 and still does great down low. I haven't reached down below 30 with this port but will see how they do when I get more ports built. Started out wired for 4 ohm and the 750 watts each they were seeing barely made them move. Wired down to 1 ohm, 1800 got them moving a lot better. The are breaking in nicely and sound better by the hour. Even with that power it was enough to bring home 1st place 3k-6k novice class and 2nd place street beat 2. You can't go wrong with this sub!
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from Lawton. on 4/10/2016
5 Stars
They certainly are great subwoofers and no doubt will take 2k rms without a problem, I have around 3800 running to 1 and it does reach thermal capacity in a song length or so, this is Korean 5k run at 1.6 ohms set with a smd dd-1 and a mechman 320 alternator, a few batteries never under 13.5 volts
Did you find this helpful?  5 of 6 Found Helpful
Reviewed by:  from Wisconsin. on 3/17/2016
5 Stars
HDC4s are beast mode
Get one
Did you find this helpful?  4 of 5 Found Helpful
Reviewed by:  from Tulsa, OK. on 1/5/2017
5 Stars
hdc4 18 dual 1 ohm
This is the biggest, baddest, most powerful subwoofer that I have ever had in my life. It hits the lows like I've never felt in my life. Currently breaking it in on 500 watts and its already too loud. Made a ported box for it myself. When I drive down the street with my windows down people turn their heads like wtf. Awesome sub. Good job to they guys at soundqubed. 👍
Did you find this helpful?  4 of 4 Found Helpful
Reviewed by: (Verified Buyer)  from hollywood,fl. on 7/3/2016
5 Stars
Mickey d
We'll first this the first 18" sub I ever had and I was surely overwhelmed with the size and weigh of it sub is huge 71lb I had it about 4+ weeks now started out running it on hifonics brx2400 wired down to 2ohm for first week or so and just with that lil bit of power to start subs was still loud and deep then wired it to .5 ohm week later and started to realize the potential coming out of sub loud !!! Now currently have 2 brx2400s strap to one sub and wow sub went into beast mode right away and handling that power with ease really don't think it's enough but will definally get the job done for now so to wrap it up I been looking at these subs for a year or more and finally got one and not disappointed at all with it plan on doing 4 at first now am thinking 2 will be more than enough now 4 would just destroy what ever u put them in eventually great subs and for the price u can't beat em
Did you find this helpful?  4 of 4 Found Helpful
Reviewed by: (Verified Buyer)  from Holly springs ms. on 4/1/2015
5 Stars
This sub is insane. It genuinely THUNDERS. It was difficult to install and power, but after running 3500 RMS to it, I can tell it was worth it. I havent even begun to break it in yet and it already roars.
Did you find this helpful?  3 of 3 Found Helpful
Reviewed by:  from Graham, Texas. on 11/4/2016
5 Stars
I have a lil 3600 PPI pushing 2 18s lookin into better quality amp it def pushes and their loud as shit butt I nearly move em lookin at bigger PPI but I prob move to soundqubed amps I think sub's are nasty though I just need bad ass amp
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Ohio. on 9/1/2015
5 Stars
Amazing Lows
I just put my hdc4 18 in the back seat of my 01 corolla last weekend in a 7 ft2 box tuned 2 32hz. Im runnin it on the q12200d at half ohm only puttin out about 1200 watts right now for the break in an it is so loud on the lows it feels like the car is going 2 fall apart! This thing hits down 2 the teens with authority, i cant wait 2 see what it can do on the full power of the amp after its broken in! These subs are amazing for the price and will not disappoint if your looking 2 get loud on a budget!
Did you find this helpful?  2 of 3 Found Helpful
Reviewed by:  from 225. on 11/3/2014
5 Stars
Hdc4 18
It's an amazing sub totally worth the money
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Benton. on 9/28/2016
5 Stars
hdc 4.0 series
ive had my hdc418 subs now for 2 weeks. They hit hard and deep man my whole vehicle is bowing out and flexin. I'm running them with the 3500d.1 amp. My box has about 18 cubic ft of air space. Cant wait till these subs are fully broke in its gonna be awhile cause they are super tight stiff. My poor Durango is taking a beating I hope the body doesn't blow off the frame!!!lol
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from victoria texas. on 5/21/2013
5 Stars
huge bang
This sub flexs my blazer sooo hard. Has great low end response and only had it a week still scared to crank on it . Can't wait for break in
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from wilmington, oh . on 3/28/2013
5 Stars
18" 4.0 in Middle console of a rare 1998 Dodge regular cab 1500 SS/T Race Edition
Just bought the 18" 4.0 today and the customer service was great. I called AQ and spoke to Greg. He placed my order fast and was very informative. I should receive my 18" 4.0 in about a week. I have a 5000W 5000RMS Powerbass amp that will push it. Should only use about half this amp. Will be placing this monster in a Black 98 Dodge Ram 1500 Regular Cab SS/T Race Edition. Will be customizing my box to fill the space behind both seats as well as where the middle seat should be. Look forward to getting my sub, box built, and everything hooked up and tested. Will post another comment when set up is complete. Great service and will definitly buy some 8"s or 10"s 2.0s to go inside the truck aswell.
Did you find this helpful?  1 of 3 Found Helpful
Reviewed by:  from Parsons TN. on 11/27/2012

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