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Old 6th February 2008, 08:00 PM   #726
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Quote:
Originally posted by KarlXII
I just happened to do a distortion measurement.
Unfortunately I am not aware of any standard reference level i db, I just measured it playing..well, loud.
Do you have spectrum charts? And what amplifier?

dave
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Old 6th February 2008, 08:13 PM   #727
KarlXII is offline KarlXII  Sweden
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No, but I think I can do some.
Tomorrow. Wife is sleeping now.
What exactly do you mean with spectrum charts?


This is run through a passive Promitheus preamp and a Nuforce Ref9 amplifier.
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Old 6th February 2008, 08:21 PM   #728
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Quote:
Originally posted by KarlXII
What exactly do you mean with spectrum charts?
This is run through a passive Promitheus preamp and a Nuforce Ref9 amplifier.
A spectrum shows the amount of each harmonic. What you are showing is a THD measurement collapsed along the spectrum dimension (for the amplifier/speaker system) and it gives us very little meaningful information. Slicing the 3D chart at a frequency gives a spectrum vrs distortion amplitude chart that tells more. A 3D chart with spectrum, frequency and distortion amplitude would be even better.

dave
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Old 6th February 2008, 09:45 PM   #729
KarlXII is offline KarlXII  Sweden
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Quote:
Originally posted by planet10


A spectrum shows the amount of each harmonic. What you are showing is a THD measurement collapsed along the spectrum dimension (for the amplifier/speaker system) and it gives us very little meaningful information. Slicing the 3D chart at a frequency gives a spectrum vrs distortion amplitude chart that tells more. A 3D chart with spectrum, frequency and distortion amplitude would be even better.

dave
What software can accomplish that?
I'm looking in the menus of ARTA, but I can't find those particular features. Which of course doesn't mean they are not there...perhaps I just can't find them.
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Old 7th February 2008, 05:14 PM   #730
KarlXII is offline KarlXII  Sweden
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This is the best i can do, I guess.
I've done this measurement outside which resulted in much lower distortion. These are on-axis measurements from 4 feet.

2.86 volts @ 100Hz:

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5.66 volts @ 100 Hz

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Old 22nd February 2008, 05:00 PM   #731
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Since this thread has helped me so much on info, thought id share pictures of the build for you.
Fat thor with upgraded Xover
more pics to come when i find me camera

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Old 22nd February 2008, 07:24 PM   #732
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Quote:
Originally posted by camaudio
Since this thread has helped me so much on info, thought id share pictures of the build for you.
Fat thor with upgraded Xover
more pics to come when i find me camera

G]
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Wow are you building those out of corian? I'm sure alot of people would love to see more info on that. Since alot of us wanted to build corian, but are weary of the process or the router bits.

Are you using odin for the center channel?
What are you using for the dipole surrounds?
There aren't any seas excel dipole/bipole surround designs that im aware of.


I am as many will be quite curious.

Great build thus far, I'm jelous I admire your work.


nes
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Old 22nd February 2008, 07:48 PM   #733
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corian vaneer for the front, center, sub
solid corian for the surrounds, with some creative bracing

standard odin for the front
vifa for the surrounds
dayton 1kw and titanic subwoofer

any questions, just ask away!

this isnt my first corian build and already planning the next one
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Old 22nd February 2008, 08:37 PM   #734
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camaudio,

Did you already cut the port hole for the center channel? If you are using my crossover, first try it sealed. The port just made the bass sound muddy and boomy. I now have my ports stuffed with socks.

Jim
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Old 22nd February 2008, 08:46 PM   #735
Renron is offline Renron  United States
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Thanks for sharing your work with us. Very cool useing Corian. Could you please describe the differences and similarieties milling Corian vs. Ply / MDF.
Awesome internal bracing on the sub box. Is that a 15" hole? I built a massive box for my 12" Titanic and it Rocks for HT....not needed with the small Thors though
Lookin' good.
Ron
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Old 22nd February 2008, 11:17 PM   #736
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everything is already finished
these were a build for a friend....although i think ill replace my own with them someday soon

stock odin xover
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Old 22nd February 2008, 11:17 PM   #737
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milling it is easy, any wood bit will cut cleanly through it, granted it has to be sharp

glueing it together isnt for your avg DIY, it requires special procedures, dual cylinder pneumatic glue gun, hundreds of clamps, orbital sanders, etc...

but the most important thing, the cuts have to be absolutly perfectly straight and square, a tablesaw just wont cut it.

i had all the parts done on a CNC machine for this reason, to get the best seemless result.

the sub is 15"
3/4 wood with double front surrounded then by 1/2 corian and lots of bracing!
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Old 22nd February 2008, 11:17 PM   #738
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Quote:
Originally posted by jimangie1973
camaudio,

Did you already cut the port hole for the center channel? If you are using my crossover, first try it sealed. The port just made the bass sound muddy and boomy. I now have my ports stuffed with socks.

Jim
for the stock box, can you fix that with a certain amount/density f stuffy?
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Old 23rd February 2008, 01:01 AM   #739
KarlXII is offline KarlXII  Sweden
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Great work! Thanks for sharing.

I just wondered how you finish the Corian?
Sand & spraypaint? Just polish it...?

How did you like the sound of the Fat Thor with new XO?

Oh, one more - what drivers are you using for the surround speakers?
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Old 23rd February 2008, 01:29 AM   #740
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Quote:
Originally posted by KarlXII
Great work! Thanks for sharing.

I just wondered how you finish the Corian?
Sand & spraypaint? Just polish it...?

How did you like the sound of the Fat Thor with new XO?

Oh, one more - what drivers are you using for the surround speakers?

just sanded down to a p1200 and left it at that
i was thinking about buffing it, but i ran out of time
would never want to take spray paint to it

didnt ever hear them with the stock xovers, got a little impatient, maybe next time

vifa for the surrounds
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Old 23rd February 2008, 03:48 AM   #741
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some finished pics
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Old 24th February 2008, 05:25 AM   #742
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curious on peoples stuffing setups on their fat thors?
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Old 24th February 2008, 11:55 PM   #743
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Can't comment on the "Fatties" but on the smalls, I lightly stuffed long hair wool from the top down to just below the drivers, nothing below that. Bracing has held it in place since then.....I checked.
Ron
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Old 24th February 2008, 11:59 PM   #744
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i might do some smalls next!
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Old 25th February 2008, 12:37 AM   #745
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Please do!
I 'm really interested in hearing on how you feel about the differences.
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Old 25th February 2008, 04:14 AM   #746
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Ya, Ya, Ya, Ya......Please do a comparo! Wags tail in anticipation.....Pant,,,,Pant
Ron
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Old 27th February 2008, 10:33 PM   #747
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Hey!
Aren't the Corian SmallThors ready yet?
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Old 27th February 2008, 11:03 PM   #748
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guess i should post up the build pics
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Old 27th February 2008, 11:04 PM   #749
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Old 27th February 2008, 11:06 PM   #750
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