Warp's Build Thread...

[highfigh]

Other than the driver acting like it's on a bigger box, it's good for a little damping but with the baffles in yours, I'm not sure it'll be necessary. Maybe some heavy damping foam on the back wall to keep anything from bouncing back, but that's about all.

I know cabinet grade plywood is very stiff- how much vibration do you feel on the back wall when it's cranked?

 

[Warpdrv]

Ahhh.... Missed this one..... Thanks for the info highfigh, when I built brandon's (the first box), I didn't add a brace on the back wall, and as I was testing, it had a small amount of flex, which I did not care for so I added a single brace just like the one I have to break up the long back wall, that worked great.


I am just finishing my boxes for the Maelstrom-X 18" drivers 24" cubes, and I added 2 braces back there for the longer runs. The wood was layin around and I was bored so I put those boxes together over the last couple of days, now I just have to wait for the drivers to come, mid dec.

Here are a few pics.... with one of my TC2000's for scale...

 

[avaserfi]

Other than the driver acting like it's on a bigger box, it's good for a little damping but with the baffles in yours, I'm not sure it'll be necessary. Maybe some heavy damping foam on the back wall to keep anything from bouncing back, but that's about all.

Polyfill is useless as a damping agent. The only use it has is as increasing apparent box size of an enclosure as it relates to frequency response (it does not increase efficiency or cause other effects of increase cabinet size).

If one wants to deal with internal reflection issues use of a high grade acoustic material such as OC705 or 8lb mineral board is the ideal option.

 

[highfigh]

Polyfill is useless as a damping agent. The only use it has is as increasing apparent box size of an enclosure as it relates to frequency response (it does not increase efficiency or cause other effects of increase cabinet size).

If one wants to deal with internal reflection issues use of a high grade acoustic material such as OC705 or 8lb mineral board is the ideal option.

In a low powered system, it does a little but as I said, it doesn't do much. Long fiber wool used to be a "go to" material before some of the newer ones were available.

 

[avaserfi]

In a low powered system, it does a little but as I said, it doesn't do much. Long fiber wool used to be a "go to" material before some of the newer ones were available.

Power has nothing to do with damping ability. Damping ability is related to frequencies that need to be absorbed and a materials absorption coefficient at these frequencies. Polyfill has poor absorption characteristics and has virtually no ability to absorb energy at the frequencies that will be an issue within a subwoofer cabinet.

If improperly or untreated resonance issues are created by 1/2 wave resonances within the cabinet. This is a situations where a dimension of the cabinet relates to a 1/2 wavelength of a frequency produced causing a cancellation. Do note, a cabinet can act as a room and have complex interactions as well. There is also the possibility that a subwoofer can be designed to such a size that these 1/2 wave resonances are not an issue, if this is the case the only issue that would need to be dealt with is possible mechanical noise from the driver as well as complex wave interactions. In these cases the high grade acoustic materials previously recommended are still the optimal choice if efficiency is one's goal.

 

[ParadigmDawg]

Get off this forum and get in the garage and finish my sub!

Boy, don't make me tell you this again!

Power has nothing to do with damping ability. Damping ability is related to frequencies that need to be absorbed and a materials absorption coefficient at these frequencies. Polyfill has poor absorption characteristics and has virtually no ability to absorb energy at the frequencies that will be an issue within a subwoofer cabinet.

If improperly or untreated resonance issues are created by 1/2 wave resonances within the cabinet. This is a situations where a dimension of the cabinet relates to a 1/2 wavelength of a frequency produced causing a cancellation. Do note, a cabinet can act as a room and have complex interactions as well. There is also the possibility that a subwoofer can be designed to such a size that these 1/2 wave resonances are not an issue, if this is the case the only issue that would need to be dealt with is possible mechanical noise from the driver as well as complex wave interactions. In these cases the high grade acoustic materials previously recommended are still the optimal choice if efficiency is one's goal.

 

[Warpdrv]

Power has nothing to do with damping ability. Damping ability is related to frequencies that need to be absorbed and a materials absorption coefficient at these frequencies. Polyfill has poor absorption characteristics and has virtually no ability to absorb energy at the frequencies that will be an issue within a subwoofer cabinet.

If improperly or untreated resonance issues are created by 1/2 wave resonances within the cabinet. This is a situations where a dimension of the cabinet relates to a 1/2 wavelength of a frequency produced causing a cancellation. Do note, a cabinet can act as a room and have complex interactions as well. There is also the possibility that a subwoofer can be designed to such a size that these 1/2 wave resonances are not an issue, if this is the case the only issue that would need to be dealt with is possible mechanical noise from the driver as well as complex wave interactions. In these cases the high grade acoustic materials previously recommended are still the optimal choice if efficiency is one's goal.

Thanks Andrew.... I'll be lining the bottom and back wall with some rockwool material or OC703/705, whichever I find....
Any suggestions for the best product would be helpful... I have a home depot and menards building supply house hear near me...

 

[Nuance AH]

I just thought I'd post an update. I took an in-room response without EQ of the subwoofer using a 60, 70 and 80Hz crossover to my SongTower RT's. My room is not the greatest for sure, but it's not terrible consider I'm not using EQ. Or is it? You tell me.

60Hz Crossover

70Hz Crossover

80Hz Crossover

So, please enlighten experts. I'll be get getting an EQ sometime next year, for what's it's worth.

 

[Warpdrv]

My preliminary thoughts, the 80hz crossover looks the best. Using the EQ, boost the 20hz range a few db, then pull down the 40-45hz range about 4-5db and pull down the 63hz a few notches as well for starters, you would have a pretty smooth response.

Your room is very playing a very interactive part here...

Is this a plot without the Auralex Gramma...?

 

[Nuance AH]

My preliminary thoughts, the 80hz crossover looks the best. Using the EQ, boost the 20hz range a few db, then pull down the 40-45hz range about 4-5db and pull down the 63hz a few notches as well for starters, you would have a pretty smooth response.

Your room is very playing a very interactive part here...

Is this a plot without the Auralex Gramma...?

Yes sir, that is without the gramma. I realized something, though. I totally forgot to adjust the sub level with the corrections added in for my SPL meter. I will try lowering the subwoofer somewhere around 4dB and will measure again tonight. Hopefully that gets rid of that midbass hump between 40 and 60HZ.

When I get the gramma, I will measure everything again.

 

[Warpdrv]

New Arrival Prep....

Well as you guys all know, I am expecting my 18" Maelstrom-X drivers and the cabinets are eagerly waiting.... pics posted earlier....
I since that time have procured a few more drivers, which should be here this week, which I can't wait to get.

I bought a Pair of 15" Audiopulse Revo's (New) which are an improved version of the TC-2000 drivers with a LMS basket as well as other improvements. Very sexy looking drivers I do say myself....

I am also expecting the arrival of a 15" TC-3000 Titanium cone used for an amazing price I couldn't pass up the opportunity to have something new to experiment with. Another very sexy looking driver....

So my buddy came over last night to help me rip some sheets of 13ply Baltic birch to allow me a start on some boxes....
Today I started gluing up 2 boxes for the Revo's. 4 cu ft sealed internal - properly braced.
Here's a few pics of my start... Thought I would share....

Sides glued of first box

Start on second box... A couple of 15" TC-2000 drivers hanging out...

 

[Matt34]

I'm jealous.

 

[annunaki]

Warp,

How many woofers do you have now? What are all of the planned uses for them?

Nice work on your enclosures so far. I wish I had all of your clamps. I hate drilling. I think I just figured out my Christmas gift

 

[ParadigmDawg]

Wait a minute, I don't have an 18!

Andrew, build me one of those 18" Maelstrom things.....

 

[Matt34]

Wait a minute, I don't have an 18!

Andrew, build me one of those 18" Maelstrom things.....

Dude, you have nothing to really be jealous about. Axis 15", nuff said.

 

[Warpdrv]

HAhahah I love the clamps, just can't have enough of them, and worth every penny to me, now Home Depot has a whole bunch of new ones which aren't all that expensive. I'll be picking up a few more.

annunaki my intentions are to be using the 2 18" Maelstroms and 2 Revo's for reinforcement and balancing output in my great room together. I doubt I will have to run them full power all together. The Maelstroms are said to have fantastic upper bass and will go really low, and the Revo's will reinforce that kick in the gut 30-50 hz range nicely with the small inductance hump.
The TC3K will be replacing my TC2K in my bedroom.... We'll see what I end up doing with the 3 - TC2K's in the future... who knows.
Today was a great day... I got a couple of deliveries today.... The 15" Revo's, and the 15" TC3000 Titanium cone - basically the same as the Axis.


Line 'em up baby.... Driver Porn...
Revo's in Blue, TC3K front and center hanging out with the TC2K's...

 

[jamie2112]

Damn those are sick....

 

[Warpdrv]

Yeah I have been looking at the Revo's and it appears that they used the LMS baskets on them.... they are not like the picture above....

 

[Nuance AH]

Soooooo sexy! I might have to break in tonight and take them.

I look forward to hearing those bud. Oh, and augerpro sent his speakers to me today, so we'll have some cool speaks and new subs to listen to soon. OH YEAH!

 

[Warpdrv]

Update.... Made some progress....

Box 1 for the Revo is complete.... here are some pics if anyone is interested.

Still have to run the wire, install the Neutrik Speakon connector and run the wire, then glue the top on, clean up the edges with the trim bit then sand.

Box 2 is next up on the list...