Help DIY newbie with 15" sealed - AVS Forum
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post #1 of 9 Old 06-06-2012, 09:07 AM - Thread Starter
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I have an Outlaw Audio LFM-1 EX in a 6000 cu ft open floor plan, and was looking to pick up a second because it's definitely a little overwhelmed in that space. I hadn't considered DIY solutions because I have no woodworking skills. But then I saw Erich's awesome looking sealed boxes. smile.gif

I'm assuming that 2 15" sealed subs using Erich's 3.5 cu ft enclosure and Dayton Titanic MK II 15" would be superior to 2 EXs in SQ, dig a little deeper, and at least match the SPL. Is this assumption correct? For an amp, something like the Behringer iNuke 3000DSP.

And is there a better driver that would work well in one of Erich's enclosures? Or a different amp suggestion? Thinking no more than $1100-$1200 shipped.

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post #2 of 9 Old 06-06-2012, 12:29 PM
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I think those Inuke amps only put out about half of their claimed power. Something more sure would be to get an EP4000, which does 650 watts per channel @ 4 ohms, you would then add a MiniDSP for EQ functions. In order to best the outlaws you would need to apply 6 db of boost at 20hz (Q 2.0) with the DSP, this would get you 104db at 20hz, vs 102-101 db. Your response would then roll off, but if you get room gain it would be clean output vs the ported sub below this.
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post #3 of 9 Old 06-06-2012, 01:34 PM - Thread Starter
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If they'll get a couple of more db, that sounds good, particularly given the other benefits of having some ULF generation.

That's good to know about the iNuke, and that MiniDSP seems a good option. I wonder if the one of the Crown amps would be better because I've been reading how people have upgraded to them. Maybe not for this build?

Also, the idea of putting together one TC Sounds LMSR 15" sealed sub has me intrigued. Then add another down the road.

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post #4 of 9 Old 06-06-2012, 05:25 PM
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It's hard to beat the value of the EP4000, 650W x 2 or 2000W x1 @ 4 ohm measured performance for under $400.

A single LMSR15 powered by a bridged EP4000 will basically equal the pair of Titanic 15's in output, though the LMSR will start to exceed xmax down low with that much power.
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post #5 of 9 Old 06-06-2012, 10:00 PM - Thread Starter
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I was just rereading your post for a 6.5 cu ft ported box. The Titanic looks really good there. Maybe I should wait and see if Erich builds one. Two of those would be a nice bump over the Outlaws smile.gif

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post #6 of 9 Old 06-06-2012, 10:08 PM
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Eric seems hesitant to do those large ported boxes due to costs, but yes you gain a ton of efficiency down low vs sealed.
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post #7 of 9 Old 06-06-2012, 10:14 PM
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Quote:
Originally Posted by Jay1 View Post

Eric seems hesitant to do those large ported boxes due to costs, but yes you gain a ton of efficiency down low vs sealed.

I'm not really hesitant to get them done. Some are already finished. But I'm going to be swamped boxing up the SEOS waveguides and a few other things for the next week or so. It would be very difficult for me to get all of this stuff packaged up by myself until everyone that pre-ordered the waveguides gets their stuff.

I've debated finding a part time helper, which would really allow things to move forward much faster. Just not sure yet.
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post #8 of 9 Old 06-06-2012, 10:52 PM
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Quote:
Originally Posted by Jay1 View Post

I think those Inuke amps only put out about half of their claimed power. Something more sure would be to get an EP4000, which does 650 watts per channel @ 4 ohms, you would then add a MiniDSP for EQ functions. In order to best the outlaws you would need to apply 6 db of boost at 20hz (Q 2.0) with the DSP, this would get you 104db at 20hz, vs 102-101 db. Your response would then roll off, but if you get room gain it would be clean output vs the ported sub below this.

I own an Inuke 3000 DSP. They seem to deliver the better part of their claimed RMS power, just not the claims by the marketing department...

Remember - volts drive speakers, watts drive amplifier sales.......

Claimed RMS is 315 stereo into 8, 620 into 4, 1020 into 2, bridged is 1250 into 8, 2075 into 4.

At the limits of the amp and my sound card, I was measuring within a few dB of what the model predicted at a kilowatt. Certainly some SPL was lost to power compression, but I have no idea how much. Not terribly exact, I know, but better than nothing.

They do not appear to do high-level sine-wave testing all that well at really low frequencies, but I'm not 100% sure that what I saw was all amp related, as the driver was well past its linear limits.

I am working on a way to test this further, that's just turning out to be a bit more complicated than I originally thought it would be.

In my opinion, they're not a bad amp. There are two issues though, the stock fan is a bit loud (easy to fix ) and the DSP is limited to 20 Hz (this is a far bigger problem, the amp does not really roll off until 10 Hz or so).

This should sum it up, I use one, and I have other options.

Time will tell if it holds up, it is certainly easy to move around.
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post #9 of 9 Old 06-07-2012, 06:54 AM - Thread Starter
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Quote:
Originally Posted by Erich H View Post

I'm not really hesitant to get them done. Some are already finished. But I'm going to be swamped boxing up the SEOS waveguides and a few other things for the next week or so. It would be very difficult for me to get all of this stuff packaged up by myself until everyone that pre-ordered the waveguides gets their stuff.
I've debated finding a part time helper, which would really allow things to move forward much faster. Just not sure yet.

Thanks for the update, Erich.

Do you have a ported box in the works that would be suitable for the 15" Titanic?

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