Exodus Maelstrom-18" with PR's - AVS Forum
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post #1 of 23 Old 04-15-2011, 08:13 AM - Thread Starter
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Has anyone done a sub with The 18" Mal X and 2 Exodus 18" PR's?

I seems like it would be a very potent sub in a reasonable size box for a decent price.

The 5400, 5100 with the same combination is certainly more sexy but it is quite a bit more costly.

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post #2 of 23 Old 04-15-2011, 08:20 AM
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I wouldn't be surprised all be it in a bigger box to get a better result ported. Gain more down low.
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post #3 of 23 Old 04-15-2011, 08:21 AM - Thread Starter
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For my goal which is 18-20 hz it seems like a good combination.

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post #4 of 23 Old 04-15-2011, 08:30 AM
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I would go for more 18hz than 20hz personally. With the added cost off PR's, is there any gain for going the PR route. I've never had PR's so don't know what they sound like. I have never had port noise so unless you get a better sound I see no gain other than added expense.
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post #5 of 23 Old 04-15-2011, 08:46 AM - Thread Starter
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Within the context of my goals it makes sense.
Size of the box does matter.

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post #6 of 23 Old 04-15-2011, 08:48 AM
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Same tuning, PR vs Port, the PR box is going to be quite a bit smaller and no potential port noise do deal with. The downside? As mentioned before, more money and below the tuning point, a steeper roll off.
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post #7 of 23 Old 04-15-2011, 08:54 AM
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do you have the t/s parameters off the PR's you can upload.
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post #8 of 23 Old 04-15-2011, 09:10 AM - Thread Starter
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Quote:
Originally Posted by gperkins1973 View Post

do you have the t/s parameters off the PR's you can upload.

I don't the PR's disappeared off their website. I assume they will come back when they get things sorted out.

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post #9 of 23 Old 04-15-2011, 09:37 AM
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The gain being no port noise, no port resonance, and the main one IMO is a much smaller subwoofer in the end. You can end up with an 18" pr'd sub that is a 24" cube tuned to 18hz. Try that with a port that is adequate for a long throw 18".

For the Mal X try a little bigger like 8.5 or 9 cu ft and tune the pr's to 16-20hz depending on what you want.
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post #10 of 23 Old 04-15-2011, 09:37 AM
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pretty sure they had a fire sale on them because they werent selling to expectations and are discontinued
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post #11 of 23 Old 04-15-2011, 09:53 AM - Thread Starter
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Quote:
Originally Posted by kemist1117 View Post

pretty sure they had a fire sale on them because they werent selling to expectations and are discontinued

That would be a bummer. I think PR's are a good tool. to achieve a sub the average person can fit in a room.

There is an old expression, excuse me if I screw it up.
You can pick 2: fast, cost effective or quality, you can't have all three.

With a sub it is small, cheap or powerful. Pick two.

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post #12 of 23 Old 04-15-2011, 09:58 AM - Thread Starter
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They have been discontinued, bummer. I will have to see what else is available.

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post #13 of 23 Old 04-15-2011, 10:25 AM
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There's a pair for sale on another forum, $140 plus shipping.

http://www.hometheatershack.com/foru...tml#post431387

I'm sure Kevin from Exodus Audio would provide the parameters.
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post #14 of 23 Old 04-15-2011, 10:32 AM
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Why not use AE's passive radiators?

http://aespeakers.com/shop/catalog/i...1808c492c8c2ee

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

 

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post #15 of 23 Old 04-15-2011, 11:00 AM - Thread Starter
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I was talking to Exodus and he suggested his 21" passives they are not on the site but they exist.

He said the specs are QMS 4.8
Sd 1550 cm^2
Starting mass 325 g
Vas 605L
CMS 0.18 mm/N

Can someone model this? I realize the 21" PR's will need a bigger box but I am curious about the output?

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post #16 of 23 Old 04-15-2011, 11:17 AM
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I could model that up but there is no 'Fs' listed.

So, why not use the AE PR's if not the 21's?

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

 

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post #17 of 23 Old 04-15-2011, 11:18 AM
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What's the price on the 21" PR's?
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post #18 of 23 Old 04-15-2011, 11:20 AM
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post #19 of 23 Old 04-15-2011, 11:29 AM - Thread Starter
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Quote:
Originally Posted by Scott Simonian View Post

I could model that up but there is no 'Fs' listed.

So, why not use the AE PR's if not the 21's?

I thought you were supposed to use a PR that was larger then the Active driver. I thought you wanted the active to run out of steam before the passives?

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post #20 of 23 Old 04-15-2011, 11:36 AM
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Yes that is true. Most would use dual opposed PR's to cancel out the forces on the cabinet. A PR has a lot of mass and could cause rocking. You would use two 18" PR's with a single 18" driver, just fyi.

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

 

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post #21 of 23 Old 04-16-2011, 07:50 PM
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Quote:
Originally Posted by t6902wf View Post

Has anyone done a sub with The 18" Mal X and 2 Exodus 18" PR's?

I seems like it would be a very potent sub in a reasonable size box for a decent price.

The 5400, 5100 with the same combination is certainly more sexy but it is quite a bit more costly.

Here is my x2 Mal-X18/2pr18 build from A couple years ago, 15Hz Tune.

http://www.hometheatershack.com/foru...ves-build.html
sorry it appears the link is slow to load from the shack/Members DIY subwoofer DataBase

If I was to do the PR thing again id go with the M-21s ..

cheers.
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post #22 of 23 Old 04-17-2011, 10:57 AM
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Quote:
Originally Posted by t6902wf View Post

They have been discontinued, bummer. I will have to see what else is available.

I have two 18" EX PR with the mass kit that I bought but did not have time to build them... Let me know if you are interested...

Al,


"When the opponent expand, I contract,
When he contracts, I expand,
And when there is an opportunity,
I do not hit--it hits all by itself."
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post #23 of 23 Old 04-18-2011, 07:08 AM - Thread Starter
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Quote:
Originally Posted by cinema mad View Post

Here is my x2 Mal-X18/2pr18 build from A couple years ago, 15Hz Tune.

http://www.hometheatershack.com/foru...ves-build.html
sorry it appears the link is slow to load from the shack/Members DIY subwoofer DataBase

If I was to do the PR thing again id go with the M-21s ..

cheers.

Thanks for the link, did you ever do any measurements? I'd love to see them.

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