Any one her of Obsadian Car Audio? - AVS Forum
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post #1 of 28 Old 06-13-2012, 09:28 PM - Thread Starter
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The prices seem very good . By looking at the pictures they look like good quality drivers and sexy too (High roll tongue.gif ). II wonder if they would be good for HT.

They have the specs in their website.

*Sorry for misspelling...


http://obsidiancaraudio.com

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post #2 of 28 Old 06-13-2012, 10:00 PM
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Yeah, their drivers do look pretty nice.

You should check out this thread, HERE by Saabracer23, he's built a sub using the 18'' driver from Obsidian.

"Measure twice, then measure again. Only then should you even THINK about cutting."

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post #3 of 28 Old 06-13-2012, 10:04 PM - Thread Starter
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WOW! They sure look nice!

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post #4 of 28 Old 06-13-2012, 10:33 PM
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For the money it can't be beat! It truly is an incredible driver. I really wish I could get some distortion measurements on this thing, it's sounding better and better the more I use it. It reaches the depths with so much ease.

If you want to jump on one now is the time. I'll post it here but I'll also start a new thread as well. I've been talking with Nick via email and he wanted to offer up a group buy. They're on pre order right now for $169 plus shipping. If there are 25 drivers sold between AVS and HT shack the price drops to $159, if 50 are sold then the price drops to $149. He would just issue partial refund after payment once the numbers are reached. When purchasing itll ask how you heard of them, make sure to put AVS or ht shack. Quite excellent I think!

Dan
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post #5 of 28 Old 06-13-2012, 11:48 PM - Thread Starter
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Cool! I will probably be buying two of them.
I have the Dayton HF 15" and I honestly dont get very much bass out of it. Not to mention it bottoms out all the time mad.gif .

Do you know whats the difference between the 18 d2 and 18 d4?

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post #6 of 28 Old 06-14-2012, 12:26 AM
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Do you know whats the difference between the 18 d2 and 18 d4?

Just means that one uses dual 2ohm coils (4ohm load) and the other uses dual 4ohm coils (8ohm load).

I'd like to see the specs listed for the d4 version, personally.

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post #7 of 28 Old 06-14-2012, 12:44 AM
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I'd be in for four of their 18's if there was a group buy.

Now the question is, which version to buy, D4 or D2???

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post #8 of 28 Old 06-14-2012, 12:53 AM
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Depends on how you intend to wire them and power them.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #9 of 28 Old 06-14-2012, 01:07 AM
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Dont these require huge sealed cabinets? something to think about for potential buyers.

Want to measure your subwoofers? check out my dummies guide for a step by step process to Room EQ wizard
http://polaraudio.blogspot.com/2012/01/calibration.html
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post #10 of 28 Old 06-14-2012, 01:20 AM
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Yeah, they do. That can be remedied with some smart signal shaping and power but... yep, these guys like big enclosures.

They are an okay candidate for a proper LLT if one is so inclined. wink.gif

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post #11 of 28 Old 06-14-2012, 03:48 AM
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Quote:
Originally Posted by omegaslast View Post

Dont these require huge sealed cabinets? something to think about for potential buyers.

They do, but it looked good in a 6 cu ft cab on winisd and in room it sounds good. My other option was the Dayton rss390hf and honestly for a 15 that requires a huge cabinet as well, especially if you wanna go ported.

Dan
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post #12 of 28 Old 06-14-2012, 06:44 AM
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What do you guys think the cabinet sizing would be for the 18" vented?

Panasonic TC P65s2
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post #13 of 28 Old 06-14-2012, 07:49 AM
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I may be interested as well for my first build. What size enclosure sealed would these need? What type off amplification necessary? Anyone model them?
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post #14 of 28 Old 06-14-2012, 08:18 AM
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How would these do in an IB?
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post #15 of 28 Old 06-14-2012, 09:29 AM
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by the specs, they are an infinite baffle subwoofer.

6 cubic feet would be on the small side for the driver, as that gives a q of 0.96, which is pretty high.

ported would require an enourmous cabinet. if you have a spare closet and can port it, that would work.

a triple stack of magnets would really help this driver. it needs more B.

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post #16 of 28 Old 06-14-2012, 09:52 AM
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Quote:
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by the specs, they are an infinite baffle subwoofer.
6 cubic feet would be on the small side for the driver, as that gives a q of 0.96, which is pretty high.
ported would require an enourmous cabinet. if you have a spare closet and can port it, that would work.
a triple stack of magnets would really help this driver. it needs more B.

thanks ltd, looks like a different driver would do better for Me. I like the idea of an 18 though, just because.
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post #17 of 28 Old 06-14-2012, 11:07 AM
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Originally Posted by LTD02 View Post

a triple stack of magnets would really help this driver. it needs more B.
Adding an additional slug does very little to the B. Diameter is what gives you a stronger motor.

Dan Wiggins discussed this years ago at HTF when talking about the Tumult vs. the Brahma subs. Both had similar motor strength but the Brahma had 4 or 5 slugs of ferrite while the Tumult had 2 (I think). He said that car audio buyers associated the larger motor (more slugs) with a better sub when in fact, that wasn't the case.
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post #18 of 28 Old 06-14-2012, 11:30 AM
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that can't be right or there would be no reason to ever use more than one slug.

of course using a larger coil puts more "L" in the BL, so that is another way to make a stronger motor. perhaps that is what he was talking about, a different way to accomplish the same thing. i just figured that it would be easier to add an additional slug than to completely re-engineer the whole driver.

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post #19 of 28 Old 06-14-2012, 11:46 AM
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Additional slugs would be used for extending Xmax/Xmech. Wider slugs will give more flux along with the combination of a larger VC thickness. There is a listed option on the Obsidian site for an eight layer VC. That option will probably come with more BL and/or lower Qes.

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post #20 of 28 Old 06-14-2012, 02:36 PM
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Quote:
Originally Posted by Scott Simonian View Post

Yeah, they do. That can be remedied with some smart signal shaping and power but... yep, these guys like big enclosures.
They are an okay candidate for a proper LLT if one is so inclined. wink.gif

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... if you have a spare closet and can port it, that would work...

This is exactly what I want to do with two of these suckers. Do we think 71.5 cubic feet would be large enough for a two-driver LLT?

Hopefully it is, I've got the DIY itch again, and finals just ended... biggrin.gif

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post #21 of 28 Old 06-14-2012, 03:05 PM
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It would be MUCH easier to build two seperate enclosures. Trust me, a single one of my 25cuft LLT's is a PITA to move around let alone position into a room.

I modelled these @ 25cuft tuned to 11hz..... not bad. wink.gif

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post #22 of 28 Old 06-14-2012, 05:01 PM
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Yeah that's true, good point. I just don't have a spot for another giant box in the room. Just another reason to go IB I suppose...

"Measure twice, then measure again. Only then should you even THINK about cutting."

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post #23 of 28 Old 06-14-2012, 06:40 PM
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"Additional slugs would be used for extending Xmax/Xmech."

you could just use steel for that purpose. no real need for additional slugs.

"This is exactly what I want to do with two of these suckers. Do we think 71.5 cubic feet would be large enough for a two-driver LLT?"

yeah, that should be fine. winisd actually defaults the ported cab to 35 cubic feet PER driver when ported is selected with the obsidian 18". 13-15hz tuning looks the best over here, but anything in that ballpark should be workable.

1000 watts total for two drivers should get you over 120db from ~12hz up...

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post #24 of 28 Old 06-14-2012, 07:37 PM
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Yeah that's true, good point. I just don't have a spot for another giant box in the room. Just another reason to go IB I suppose...

Oops. I missed the part about the available closet. Yeah, one could do that. It's been done a few times with success. Though I'd personally not use ports and just get 4-8 of these drivers and IB them in that space.

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post #25 of 28 Old 06-14-2012, 09:45 PM
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Oops. I missed the part about the available closet. Yeah, one could do that. It's been done a few times with success. Though I'd personally not use ports and just get 4-8 of these drivers and IB them in that space.

Surely you don't mean IB them in that closet. Though, I could put the manifold opening in that closet to hide it, if that wouldn't mess with things. I bet it would.

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post #26 of 28 Old 06-14-2012, 10:37 PM
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Quote:
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Surely you don't mean IB them in that closet.

I do. However, I haven't seen you closet but you brought up the idea first. wink.gif

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Though, I could put the manifold opening in that closet to hide it, if that wouldn't mess with things. I bet it would.

Not sure why you think that. You were going to make an LLT out of the closet. Why would it suddenly be "messed up" if it were sealed?

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post #27 of 28 Old 06-15-2012, 02:34 AM
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Quote:
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I do. However, I haven't seen you closet but you brought up the idea first. wink.gif

Not sure why you think that. You were going to make an LLT out of the closet. Why would it suddenly be "messed up" if it were sealed?

Well, since IB is meant to take advantage of a huge 'cabinet,' and since the Cult recommends a 'cabinet' size at least 10x the Vas per driver (which is 170.1L for Obsidian's 18") - That puts me about 1200L over what I have available in the closet itself.

To be honest though, it's a bit of a moot point, since I've got another wall and a floor as options for an IB manifold location. I just liked the idea of using an entire closet as a subwoofer. Especially since we barely use the closet.

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post #28 of 28 Old 06-15-2012, 05:37 AM
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scott is right. a large sealed and an "infinite baffle" are really just shades of gray and what he proposes is close enough to an i.b. to for practical purposes be considered that.

yellow is four drivers in the closet, 70 cubic feet total.

blue is one driver with 70 cubic feet, which is 10x vas or an "infinite baffle" defined how you define it.

both driven to xmax around 10hz, 2000w in the first case, 350w in the second.

obviously four sealed in the closet works great.

331

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