SKRAM Baltic Birch Twins (build) - Page 2 - AVS Forum | Home Theater Discussions And Reviews
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post #31 of 53 Old 02-11-2020, 04:25 PM - Thread Starter
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Quote:
Originally Posted by Ricci View Post
The more I look at these the more I like the finish you put on these.
Thank you!

I was set to put duratex on them, but was told by the boss that I should match the other stained boxes
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post #32 of 53 Old 02-11-2020, 05:44 PM - Thread Starter
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Did some quick and dirty port measurements of a single skram with low power/voltage. @Ricci

A umik-1 was placed 12 inches from front of the skram at exactly the middle port brace about 5.25 inches off of the ground. The mic was facing the skram (not perpendicular). I just used some spare closed cell foam as a makeshift port blocker for each port.

The receiver crossover was set to 200hz. The minidsp xover had a high pass which was bypassed and a low pass set to 500hz. All PEQ was disabled.

The in room measurements were as follows for all 4 ports open, 3 ports open, 2 ports open, and 1 port open. Interesting result between 3 and 2 open.
Perhaps that is due to mic placement in relation to the way I blocked the ports. Right port was blocked for 3 ports open. Middle two ports were blocked for 2 ports open. Left port was left open for 1 port open.

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post #33 of 53 Old 02-11-2020, 05:52 PM
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Quote:
Originally Posted by klipsch View Post

The receiver crossover was set to 200hz. The minidsp xover had a high pass which was bypassed and a low pass set to 500hz. All PEQ was disabled.

You sure the highpass was disabled? Sure looks like there’s one on.

Here’s my sweeps with blocking ports on my HST.


On those,I did run the highpass, but set it for each port tune.

Chris
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post #34 of 53 Old 02-11-2020, 06:27 PM - Thread Starter
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You sure the highpass was disabled? Sure looks like there’s one on.


Chris
The line was straight to 0 on the left and the red bypass icon was lit. Maybe I didn't set something else up properly
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post #35 of 53 Old 02-11-2020, 06:32 PM
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SKRAM Baltic Birch Twins (build)

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Originally Posted by klipsch View Post
The line was straight to 0 on the left and the red bypass icon was lit. Maybe I didn't set something else up properly


Sure you were synchronized and on the right channel?
(Not that I’ve ever done either of these things)

That really looks to me like a 25hz hpf, relatively steep.

Chris
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post #36 of 53 Old 02-11-2020, 06:40 PM - Thread Starter
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Originally Posted by a77cj7 View Post
Sure you were synchronized and on the right channel?
(Not that I’ve ever done either of these things)

That really looks to me like a 25hz hpf, relatively steep.

Chris
hmmmm

I was just thinking I put the mic in front of the wrong skram, but then blocking the ports wouldn't have had different responses and the SPL would be crazy from that far away at such a low volume ...

I'm using a sinbosen 20000q right out of the box. I didn't mess with it yet

Maybe there is a high pass enabled on it by default?
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post #37 of 53 Old 02-12-2020, 07:13 AM
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Looks like the distance from the port center to the mic changing relative to the upper section mouth. At a 12" distance even a difference of a few inches makes a big difference in the SPL at the mic. Try to keep the vent/s that are open in the center where the center mouth radiation is from and keep the mic on axis. Another way would be to forget about a close mic and measure the in room response while changing the vents with just the Skram running and any HPF turned off. Don't worry about the room response being ugly. You only need to look for the change in the low frequency shape and level.
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post #38 of 53 Old 02-12-2020, 07:39 AM
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You definitely measured the right cab. The response would not look that good from across the room.

One vent blocked is clearly the best of those sweeps.

It does look like a steep drop on the low end for an in room sweep without a hpf.
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post #39 of 53 Old 02-12-2020, 07:50 AM
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I don't think the integration of the outputs is good at the mic when the radiation pattern and distance changes due to blocking ports. 2 vents blocked in particular does not look right.
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post #40 of 53 Old 02-19-2020, 05:52 PM - Thread Starter
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Been enjoying these skrams too much. However, did get around to doing a quick test at the MLP. Receiver is set to -20.0 and the MLP is 14.5 feet from this single skram test.

The MLP appears to have a null/room node for this one skram (left side skram) which is that big dip in the graph. The results with running all ports open, 3 ports open, 2 ports open, and 1 port open are below. No PEQ, high pass is bypassed, and low pass was set to 110 BW42db/oct. (1 port open at the MLP is hitting 82db at 12.8hz. )



For the size of these skram boxes, I thought that it was quite impressive to see these results along with the great SQ they produce.

@Ricci , it looks like your 14hz tuning is about right for one port open!
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post #41 of 53 Old 02-20-2020, 10:06 AM
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Which tune do you like the best, subjectively? Are you set on one specific tune for general use yet, or is that something you're still playing with?


"You can never have too many clamps."
My DIYSG HTM-12 build
My dual sealed UXL-18 build
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post #42 of 53 Old 02-20-2020, 07:52 PM - Thread Starter
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Which tune do you like the best, subjectively? Are you set on one specific tune for general use yet, or is that something you're still playing with?
There's no bad tune. I've been running these with all open ports for a bit now as that is just how I started off. The results are phenomenal. The 8 18s never gave me the kick drum hit like live music does like these skrams give. I planned to tweak and experiment more, but I've been enjoying things as is right now too much to spend more time with some different configurations.

For movies, I've been very pleased as well.

Are you looking to build a skram or skhorn?
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post #43 of 53 Old 02-21-2020, 12:26 PM
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Nah, I don't have the space for much in my room. Actually, we'll see what I have room for after I get drywall up, but right now I'll have the pair of sealed UXL-18s and a bunch of the $30 JBLs in BOSS/riser config and I'm going to see how that all sounds before I start looking to change anything. I don't think I'll have room for a horn anywhere, maybe a VBSS or two at the most (if required). Having heard some phenomenal horn subs at Jeremy's (@hd0823) house I kind of fell in love with the sound though. If I had a bigger room I'd plan to have a pair of horns of some description.


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post #44 of 53 Old 02-21-2020, 04:43 PM
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Originally Posted by OJ Bartley View Post
Nah, I don't have the space for much in my room. Actually, we'll see what I have room for after I get drywall up, but right now I'll have the pair of sealed UXL-18s and a bunch of the $30 JBLs in BOSS/riser config and I'm going to see how that all sounds before I start looking to change anything. I don't think I'll have room for a horn anywhere, maybe a VBSS or two at the most (if required). Having heard some phenomenal horn subs at Jeremy's (@hd0823) house I kind of fell in love with the sound though. If I had a bigger room I'd plan to have a pair of horns of some description.


You could look at a mini dev in the 18” sub variant.


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post #45 of 53 Old 02-22-2020, 06:42 AM - Thread Starter
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Quote:
Originally Posted by OJ Bartley View Post
Nah, I don't have the space for much in my room. Actually, we'll see what I have room for after I get drywall up, but right now I'll have the pair of sealed UXL-18s and a bunch of the $30 JBLs in BOSS/riser config and I'm going to see how that all sounds before I start looking to change anything. I don't think I'll have room for a horn anywhere, maybe a VBSS or two at the most (if required). Having heard some phenomenal horn subs at Jeremy's (@hd0823) house I kind of fell in love with the sound though. If I had a bigger room I'd plan to have a pair of horns of some description.
The skrams are 16 cubic feet. Much bigger than a sealed box for 18s like you currently have. Every answer to any question in this forum seems to be "devastator" anymore. Great marketing and business, even for people like me who can run material through my cnc. However, the devastators are not small either. Most are much larger than the skram. I think the smaller mini varients are smaller than the skrams at aound 14.5 cubic feet. I've never seen the inductance response, thd, port tuning options, etc. tested for the mini dev, but it would be a good exercise to compare the skram and some of the devastator varients of similar size to understand the pros and cons of both.
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post #46 of 53 Old 02-22-2020, 07:01 AM
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The 48db lpf might be creating a lot of delay. You might want to test out 24db. Although I doubt you could hear a difference. Delay starts to shoot up once you get past 24db, in models anyhow.
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post #47 of 53 Old 02-22-2020, 11:19 AM
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Quote:
Originally Posted by klipsch View Post
The skrams are 16 cubic feet. Much bigger than a sealed box for 18s like you currently have. Every answer to any question in this forum seems to be "devastator" anymore. Great marketing and business, even for people like me who can run material through my cnc. However, the devastators are not small either. Most are much larger than the skram. I think the smaller mini varients are smaller than the skrams at aound 14.5 cubic feet. I've never seen the inductance response, thd, port tuning options, etc. tested for the mini dev, but it would be a good exercise to compare the skram and some of the devastator varients of similar size to understand the pros and cons of both.
A head to head would be awesome but not exactly the easiest thing to do since the Skram plans are not exactly free in the wild like the Dev plans are. Hopefully that will change as I would like to build some Skrams one day.


Juju

Sub List: 1- Red Five Mini V1 Devastator 18" w/PA460, 1- Red Five Devastator LFE 21", 1- Red Five Devastator 21" Finalizer V2 DF , 1- BOSS platform [The Hideaway Theater], 2- 18" "Full Marty" tuned to 17Hz w/RSS460HO
Wish List: Anthology http://www.speakerdesignworks.com/Anthology_1.html

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post #48 of 53 Old 02-22-2020, 11:57 AM
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A head to head would be awesome but not exactly the easiest thing to do since the Skram plans are not exactly free in the wild like the Dev plans are. Hopefully that will change as I would like to build some Skrams one day.


Juju
You can DL the plans for free from Data-Bass.
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post #49 of 53 Old 02-22-2020, 12:08 PM
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You can DL the plans for free from Data-Bass.
When you go here it says unavailable.....


http://data-bass.ipbhost.com/topic/7...bwoofer-files/


Juju

Sub List: 1- Red Five Mini V1 Devastator 18" w/PA460, 1- Red Five Devastator LFE 21", 1- Red Five Devastator 21" Finalizer V2 DF , 1- BOSS platform [The Hideaway Theater], 2- 18" "Full Marty" tuned to 17Hz w/RSS460HO
Wish List: Anthology http://www.speakerdesignworks.com/Anthology_1.html

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post #50 of 53 Old 02-22-2020, 12:18 PM
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Originally Posted by jujuman200 View Post
When you go here it says unavailable.....


http://data-bass.ipbhost.com/topic/7...bwoofer-files/


Juju
Are you logged it? It lets me DL it.
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post #51 of 53 Old 02-22-2020, 12:26 PM
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Are you logged it? It lets me DL it.
Yep, I got it..... forgot to log in... DOH!! Thanks



Juju
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Sub List: 1- Red Five Mini V1 Devastator 18" w/PA460, 1- Red Five Devastator LFE 21", 1- Red Five Devastator 21" Finalizer V2 DF , 1- BOSS platform [The Hideaway Theater], 2- 18" "Full Marty" tuned to 17Hz w/RSS460HO
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post #52 of 53 Old 02-22-2020, 12:37 PM
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How have I not come across your thread here yet. Very nice! I wish I could report any progress on my vacuum table yet, but I have to finish a few other projects first.


That hatch clamping is mad. I made mine like this, which needs minimum clamping (if you're not using Kreg screws in the first place):





I've ordered my first two one handed clamps. I like em. Now I just need another 18.
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post #53 of 53 Old 02-24-2020, 04:16 AM - Thread Starter
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How have I not come across your thread here yet. Very nice! I wish I could report any progress on my vacuum table yet, but I have to finish a few other projects first.


That hatch clamping is mad. I made mine like this, which needs minimum clamping (if you're not using Kreg screws in the first place):





I've ordered my first two one handed clamps. I like em. Now I just need another 18.
Thanks!

Nice looking design. Looking forward to your build thread and a few more clamps
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