Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 181 Old 12-03-09, 12:28 PM
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

I did mean 5hz, but as I said, my measurements are suspect till I figure out why they look so odd.

I'm going to tackle measurements again tonight since my movie night for this Friday was canceled. I've been in a rush to get more absorbers and diffusers built before this movie night, but now I can take my time and figure out my measurement issues. Again, 15Hz is no problem, even in my open floorplan.
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post #62 of 181 Old 12-03-09, 02:18 PM Thread Starter
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

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Lonely Raven wrote: View Post
I did mean 5hz, but as I said, my measurements are suspect till I figure out why they look so odd.

Again, 15Hz is no problem, even in my open floorplan.
You also have room gain to add to that as well, so that will help. 16hz is the lowest note from an organ.

I just got in with the passives and $75 more in hardware to finish the subwoofer and add more mass to the passives. I have to add 500 grams to each of them to get my 2100 grams. My supplier only had the 18" 1600s partially built, so I told him to just finish them and I'll add the extra mass to the suspension to get my 2100s.

Can't play in the forums and work on the sub at the same time so it's time to get back at it.
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post #63 of 181 Old 12-03-09, 05:25 PM Thread Starter
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

Ok, I can play in the forum a minute or so....

I've got the bottom painted, the routed and sanded Red Oak runner feet installed, and to tease and taunt ya a bit, I temporarily dry fitted the sub and couple of passives. It looks so small in these pics!

I've still got to fill in the wood around the bottom of the cabinet and sand it down square to get it ready for the laminate. We may get snow tomorrow and the coldest temps of the season, so that's not a good time to fire up my blast furnace and spread contact cement. I may get postponed on the laminate tomorrow. I'll get the final mass loaded in the passive radiators tonight and have them sit overnight in the house with the Devcon two part epoxy. That will be just another step out of the way.

Well Lonley Ravin, here are more teaser pics for ya. Just wait till the black slate Pionite is on! They will really look sharp then. Look at that massive terminal. They will accept bananna plugs, ring terminals, or up to a #4 supply wire!

Without the drivers in place, I was able to stand it up in the upright position. I don't have a clue how I'm going to weigh it. I might get two scales, balance it on a 2 x 6, and sum the totals of the scales. But in reality, who cares!
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post #64 of 181 Old 12-03-09, 06:08 PM
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

Wow, there's the star!! Makes me wonder what I'm doing buying Tempests.
Oh yeah, runout!

Good plan with the scales, or if you've only got one set you could put it under one end at a time, and prop the other end with something like the scales for a really close approximation.
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post #65 of 181 Old 12-04-09, 08:23 AM
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

Looking good, Mike!

I've finally gotten my act together and updated my thread with photos and measurements, and even a cheesy video for the excursion fanatics.

I'm betting that your box, even though smaller, and even without the weighted passives, is heavier then my completed box! Though I don't *see* any resonation in my larger side panels, I can physically see the box rock a few mm forward and back when the Maelstrom is going full tilt. It's a trade off for a box I could actually move on my own. I swear this box is lighter then my dual folded horn which was MDF with a pair of JL Audio 10"

I don't envy you're having to move those beasts, but I'm betting once in place they will be stunningly good!
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post #66 of 181 Old 12-04-09, 09:16 AM Thread Starter
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

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Lonely Raven wrote: View Post
Looking good, Mike!

I've finally gotten my act together and updated my thread with photos and measurements, and even a cheesy video for the excursion fanatics.

I'm betting that your box, even though smaller, and even without the weighted passives, is heavier then my completed box! Though I don't *see* any resonation in my larger side panels, I can physically see the box rock a few mm forward and back when the Maelstrom is going full tilt. It's a trade off for a box I could actually move on my own. I swear this box is lighter then my dual folded horn which was MDF with a pair of JL Audio 10"

I don't envy you're having to move those beasts, but I'm betting once in place they will be stunningly good!
You did good with the video. How much power were you giving the driver? You did a good job with the thread and your build pics too. I'm glad you are done and am enjoying it.

BTW.....hate to burst your bubble, but the first one with a finished 21" Maelstrom subwoofer takes the first slot in product completion. That includes the finishing work and grills if used. You better get to that bedliner shop quick!! My laminate goes on today!

You are right on the weight. I think my sub probably has double the weight of yours. It took everything I had to pick up one end of the cabinet to stand it upright, without the drivers. I wanted to make sure I had no resonance and as usual, I overkill everything I do.
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post #67 of 181 Old 12-04-09, 04:08 PM
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

I threw a table cloth over mine that blends in perfectly with the decor. It's now "finished"

I was running an EP2500, bridged mono on mine, but the input from the HTPC was a little lower then usual, and I only have the volume on the the EP2500 at 1 o'clock. So I have some breathing room. The EP2500 doesn't test out as very efficient at 20Hz and below as well. I just can't afford a more robust amp at this time. This should do fine for now.

I totally understand the overbuilding...I usually overbuild so I'm not left wanting...but I also promised myself I wouldn't build a back-breaking box again since I might be moving it a bit, plus, I got the 3/4 plywood on sale...which helped me get the project done within budget (which was blown with the 21" driver over the 18" driver), and almost in the time frame I projected. If I had access to the materials you have, I would have considered overbuilt, if I didn't promise myself to keep the weight down.
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post #68 of 181 Old 12-04-09, 04:35 PM Thread Starter
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

Raven,

I wouldn't even have considered using the 1.25 mdf unless it was a sub....I'm regretting it now, but by the end of the weekend, I'll be happy with it, I hope. It is snowing and I'm higher than the sky it's falling out of. I really enjoy this laminate work now!!! Anybody got some more contact cement? It's a trip......I've also learned how to route thumbs now. It aint fun or pretty......two sides are done now and only two left to go and then the top. I'm staying with it till it's done tonight if I've still got all of my fingers left.....

Sorry, you can't hide behind the ladie's skirt.....the sub has to be finished........

Payback time here buddy.....
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post #69 of 181 Old 12-04-09, 06:59 PM
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

Hahaha! Good one, Mike.

Careful with the sharp objects there!

I think this weekend is going to be family stuff and working on sound treatment. Enjoy your subs!
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post #70 of 181 Old 12-04-09, 07:20 PM Thread Starter
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Re: Maelstrom 21" With 4 - 2100 Gram 18" Passive Radiators

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Lonely Raven wrote: View Post
Hahaha! Good one, Mike.

Careful with the sharp objects there!

I think this weekend is going to be family stuff and working on sound treatment. Enjoy your subs!
I'm kind of new to this stuff, but does "working on sound treatment" mean telling everyone to shut up while you're working?

Hey dude.....it's Woodstock all over again here.....you can't imagine all of the colors and things I'm seeing again. I don't want to open the door and lose it all.....I'm just about done with the laminate and the drivers go in tomorrow! Weeeee...... I've just got to figure out how to wire these passive radiators!
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