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  #1  
Old 08-07-2015, 06:29 PM
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Talking DD3512c, DD 9512g, Aqhdc312

Wanted to post my experiences with this subs that I used/use daily in my car, same box, 140 km to and from work weekdays.
First off was the 3512c, which sounded real good for a sub that had then lived for 6 years when i bought it. However I was pushing too hard and I fried the coil. The Aq’s were on sale when i ordered the dd recones and since I had no bass...whattodo .. After some weeks with the aq’s I reconed the 3512s with the 12 spoke basket, and I never heard a sub sound so good it was almost unreal.
I couldn't resist buying a dd9512g when I was offered one, and it actually disappointed me. It didn’t live up to the hype. The lows were lacking, almost nonexistent, and the thing was monstorous compared to the 3512. I decided to revert to the 3512, but fate had shifted the magnets and the sub was stuck. Hmm. Back to Aq which all along had a mechanical sound whenever the volume went up while playing the lows. All along I though it was not run in but the quality differences with the DD were too obvious to ignore. The mechanical sound wouldn’t go away, so I had to put the 9512 back in.
At a closer look my 9512 had a spacer ring, and the guy I bought it from kept on referring to it as a 9912. The gluing on the sub was crude since it seemed like whoever coned it loved applying tonnes of glue. The guy actually offloaded the sub since he broke the basket of his other sub while competing and he reckoned it was time to upgrade his subs. With more questions than answers, I ordered the 9512 recone kit. When I cut out the 9512 the thing had like 9 spiders in different colors and the 3512 only had four of those. My hunch was right; this thing was customized for competitions. After recone the 9512 woke me up to another new world. While it really didn’t hit the sweet spot the 3512 did at low volumes, the sucker was a monster. After a few weeks I couldn’t really tell if the 2 really differed that much SQ wise at low volumes.
However, you turn up the volume knob and somewhere up there the 9512 shows who’s boss, literally. The Aq was kind of similar in character to the 9512 at around 40 Hz, little more authority than the 3512 when cranked up, but it really never delivered. The 3512 sounded almost perfect until you could sense some fatigue when the wattage was getting real high (This is where the 9512 really shines). I believe the3512 was rated at 800 and I was feeding it 1500-2000 watts (RF t2001bd). I tried a bigger box for the 9512 and it actually sounded much better than before, only to revert to my old box when I changed cars due to space issues. I replaced the Amp for the ddm2b for the same reasons too. The 95’s sounds even more cleaner since I still bump it today, 6 years after recone.
I traded the Aq for a 4 channel amp after I reconed it. The gluing was lacking. I basically peeled the thing off; I never cut nothing out, only unscrewing of the spider landings was necessary. The motors didn’t display the same quality either. They didn’t use CA glue on them from the factory. All in all the build was lacking. The soft parts I ordered felt ‘real cheap’ compared to DD’s. No wonder people ‘hybrid them’
I still never got to realize the potential of the Aq´s. The 9512 came out winning though. The 3512 actually lost only in power handling. I would rate is as a SQ woofer. I’ve never had the opportunity to listen to the JL W7’s but if they compare them to the DD’s, they gotta be real real good (they are rated lower than the DD’s though).
There has been 3 revisions and supercharging options since then on the 9512’s. I might be getting a deal on a 9512j soon and will see how it compares to the G. So if I have my say, the 9512g > 3512c > Aqhdc312.
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  #2  
Old 09-25-2015, 07:05 PM
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There has also been a revision on the HDC3(now Soundqubed), and now a HDC4 as well.
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Old 09-25-2015, 07:54 PM
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Quote:
Originally Posted by neillio View Post
There has also been a revision on the HDC3(now Soundqubed), and now a HDC4 as well.
What did they change on them?
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Old 09-25-2015, 09:04 PM
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Hahaha hahahaha. Another soundqubed has cheap parts review. I'll keep singing the same tune. Soundqubed is cheap Chinese DD knockoff. Wake up Nutt huggers
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Old 09-26-2015, 11:28 AM
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Actually, SQ is an inexpensive option to those that want to get loud on a budget. The HDC4 is a very good entry level 4" coil subwoofer. Several guys are doing 150.1 with a single 15, and a couple are doing 153-155 with a single 18. As far as being a 'Chinese DD knockoff'... a very large percentage of subwoofers built today are being shipped from China.
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Old 09-26-2015, 12:12 PM
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SQ is cheap in all senses of the word.

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Old 09-26-2015, 02:41 PM
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Quote:
Originally Posted by adulbrich View Post
SQ is cheap in all senses of the word.

/thread
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  #8  
Old 09-26-2015, 02:47 PM
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Why would anyone think the parts, etc would be nearly the same on a $279 woofer (SQ HDC312) as a $900 woofer (DD9512)? A closer comparison would be the HDC412 vs 9512 but that wasn't the case here. So it's an apples to oranges comparison. I could put an American Bass HD15 up against the HDC315 and that would be apples to apples.
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  #9  
Old 09-26-2015, 02:50 PM
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Quote:
Originally Posted by neillio View Post
Why would anyone think the parts, etc would be nearly the same on a $279 woofer (SQ HDC312) as a $900 woofer (DD9512)? A closer comparison would be the HDC412 vs 9512 but that wasn't the case here. So it's an apples to oranges comparison. I could put an American Bass HD15 up against the HDC315 and that would be apples to apples.
I agree, if the parts on a sub that's 3-4 times the price aren't better than there's a huge problem in peoples logic.
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Old 09-26-2015, 05:57 PM
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When I recone subs(9512,hdc3 12) or whatever, I never drop it in as I receive it. I do my own personal touches to them first. Just stuff I learned from Ric at Pulse car audio.
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