8x 18" LMS 5400 Ultras Sealed to 27 Cube 15hz Ported Build - Page 10 - AVS Forum
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post #271 of 512 Old 03-10-2014, 11:27 PM
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^^You have big time issues with your response notnyt! tongue.gif

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post #272 of 512 Old 03-10-2014, 11:28 PM - Thread Starter
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^^You have big time issues with your response notnyt! biggrin.gif

XT32 doing its thing nicely =]

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post #273 of 512 Old 03-10-2014, 11:33 PM
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XT32 doing its thing nicely =]

No seriously it looks totally awesome response wise and looks wise. It's a really out there system you have there.
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post #274 of 512 Old 03-10-2014, 11:33 PM
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No seriously it looks totally awesome response wise and looks wise. It's a really out there system you have there.

Totally! +1

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post #275 of 512 Old 03-10-2014, 11:34 PM - Thread Starter
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No seriously it looks totally awesome response wise and looks wise. It's a really out there system you have there.

There's a small null around 80hz. I try not to let it bother me wink.gif
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post #276 of 512 Old 03-10-2014, 11:38 PM - Thread Starter
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and a big +1 to Herb at CSL. (or csa now?) Calibration for the umik1 is great. Much easier than my emm6. I think I'll sell it with the amp soon.
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post #277 of 512 Old 03-10-2014, 11:46 PM
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"nu1000dsp powering transducers"

ah!

...

looks like you might be getting some compression in the 125db sweep...any concern about that? LOLOL.

perhaps surprisingly, the ports don't seem to be compressing even at that ridiculous level. good design there.


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post #278 of 512 Old 03-10-2014, 11:55 PM - Thread Starter
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"nu1000dsp powering transducers"

ah!

...

looks like you might be getting some compression in the 125db sweep...any concern about that? LOLOL.

perhaps surprisingly, the ports don't seem to be compressing even at that ridiculous level. good design there.


Hard to say for sure, the walls ... move... a lot.... look at the lower frequencies there, you can see its actually gaining output.. also the mid level sweep gained output over the first sweep... Either way, there were no port noises. When I ran sine waves through them one at a time at max levels I was able to hear them them being not so happy, so there's still some room left.

I'm wondering if the mic is compressing there. Keep in mind the calibration at those frequencies is boosted.

izxZrQF.png
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post #279 of 512 Old 03-11-2014, 12:08 AM - Thread Starter
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Originally Posted by notnyt View Post

Hard to say for sure, the walls ... move... a lot.... look at the lower frequencies there, you can see its actually gaining output.. also the mid level sweep gained output over the first sweep... Either way, there were no port noises. When I ran sine waves through them one at a time at max levels I was able to hear them them being not so happy, so there's still some room left.

I'm wondering if the mic is compressing there. Keep in mind the calibration at those frequencies is boosted.

Aaaaaaand, updated compression graphs so you can see in more detail. Look at the low frequency on the high level sweep....

0pX50Ip.png
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post #280 of 512 Old 03-11-2014, 03:08 AM - Thread Starter
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and if flaming skulls are simply too much...yeah, that had to go. :-)

flaming skulls were awesome.
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post #281 of 512 Old 03-11-2014, 03:16 AM
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Awesome.

Graphs only go so far, hearing is believing, wish I could listen...

I probably missed this, what is the final size/length of the port?
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post #282 of 512 Old 03-11-2014, 03:22 AM - Thread Starter
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Awesome.

Graphs only go so far, hearing is believing, wish I could listen...

I probably missed this, what is the final size/length of the port?

effective port length of 55". Tune came in at 14.7hz or so. If you come to NY you can have a listen =]
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post #283 of 512 Old 03-11-2014, 03:31 AM
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effective port length of 55". Tune came in at 14.7hz or so. If you come to NY you can have a listen =]

I will take you up on that if I am ever in NY smile.gif

What was the height/width of the port?
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post #284 of 512 Old 03-11-2014, 07:58 AM - Thread Starter
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post #285 of 512 Old 03-11-2014, 08:55 AM
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effective port length of 55". Tune came in at 14.7hz or so. If you come to NY you can have a listen =]

 

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post #286 of 512 Old 03-11-2014, 08:55 AM
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What frequency were those distortion measurements produced?
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post #287 of 512 Old 03-11-2014, 08:58 AM - Thread Starter
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I need to stop by.

Hah, feel free. I warn you, the urge to upgrade things after will be strong =]
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post #288 of 512 Old 03-11-2014, 10:57 AM
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Notnyt, are you running a high pass? Also, are your crowsons being effected by Audyssey or do you have them on a separate feed?
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post #289 of 512 Old 03-11-2014, 12:26 PM - Thread Starter
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Notnyt, are you running a high pass? Also, are your crowsons being effected by Audyssey or do you have them on a separate feed?

They're on the transducer output from my avr, so not affected.

I highpass the subs at 13hz 3rd order, who knows what it actually is as minidsp 2x8 is a bit mental down there. I've measured loopbacks and took the one that looked best in that area.
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post #290 of 512 Old 03-11-2014, 12:37 PM - Thread Starter
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Here's a bunch of different filters from the minidsp at low frequencies to show how erratic it can be. These are from REW, so you will need to load in there.
download measurements
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post #291 of 512 Old 03-11-2014, 01:55 PM
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Great build man, can only imagine what that feels like.
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post #292 of 512 Old 03-11-2014, 03:32 PM
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Is the port length actually 55"? I ask because you use the word effective and because there was some talk of corrections on the port length in the old thread as I recall. I wanted to know the actual physical port length to see how it differs from WinISD numbers.
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post #293 of 512 Old 03-11-2014, 04:58 PM - Thread Starter
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Is the port length actually 55"? I ask because you use the word effective and because there was some talk of corrections on the port length in the old thread as I recall. I wanted to know the actual physical port length to see how it differs from WinISD numbers.

If you want to measure center line down the port, its 53.25.

The actual effective length requires the addition of half of the port height since the back wall continues, so its 55".
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post #294 of 512 Old 03-11-2014, 05:32 PM
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Thanks.

So it would seem the WinISD numbers were correct.
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post #295 of 512 Old 03-11-2014, 05:38 PM - Thread Starter
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Thanks.

So it would seem the WinISD numbers were correct.

They were close. The tuning actually came in at about 14.7hz, so it was a little long.
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post #296 of 512 Old 03-11-2014, 07:25 PM
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"flaming skulls were awesome."

didn't know if they were mucking up your thread. since they are 'awesome', i put them back up there. :-)
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post #297 of 512 Old 03-11-2014, 07:30 PM
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regarding the cancellation at 80hz. i'm sure you know, 1/4 distance cancellation correlates to about 3.5 feet to boundary. i'm guessing your picking up cancellation of both the side and rear walls?

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post #298 of 512 Old 03-11-2014, 07:44 PM - Thread Starter
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regarding the cancellation at 80hz. i'm sure you know, 1/4 distance cancellation correlates to about 3.5 feet to boundary. i'm guessing your picking up cancellation of both the side and rear walls?

It's an tangential mode followed by an oblique mode.... Using a room sim, as well as taking measurements, the dropout shrinks as i move it forward or backwards. However, other areas get worse, which matches my measurements. I'll take a small part of an octave dropout over something much larger. It's not really noticeable as it is. Not much I can really do given the space.
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post #299 of 512 Old 03-11-2014, 08:10 PM
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"It's an tangential mode followed by an oblique mode...."

that is kind of surprising, given how pronounced it is.

Listen. It's All Good.
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post #300 of 512 Old 03-11-2014, 08:16 PM - Thread Starter
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"It's an tangential mode followed by an oblique mode...."

that is kind of surprising, given how pronounced it is.

It's in about the center of a 24x25ish room. Got some weird interactions too from not having a wall on the back rear part. If there was an easy way to treat it or move the lp without making something else I'm all ears.
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