Looking good!
Printable View
Looking good!
http://www.hostboard.com/forums/hbmc...2010/09/25.jpg
http://www.hostboard.com/forums/hbmc...2010/09/26.jpg
Yeah, the automatic resizer here can be a real drag . Hard to read graphs will definately inhibit meaningfull discussion .Quote:
Originally Posted by John
(IMHO), one should post important pics somewhere else ( that is stable & secure ) and just link into them ( as I've done above ) from the thread.
<> cheers
PS : I'd like to see a more critical vertical db scale used in your display , such as 50 db .
- 50 db vertical used to be accepted as a Pro standard ( can't remember the horizontal speed ) .
- Going larger than 50 db starts to employ more & more wishful thinking ( in the form of vertical squashing/ ie; smoothing ) .
@ GM & Earl I will get started on those other measurements you guys had requested.
BTW: :thankU: Both for you Kind and Gracious support it is really Appreciated !! :)
Hey Earl,
I generated those graphs. Will redo for a 50dB scale.
A-B, send me the new T-350 files (the whole zip) and I will generate those, too.
OK, here are the 288 plots redone. 50dB scale, 1/6th octave smoothing.
Please not that driver #2 was measured off axis. Also see below driver #1 which appears to have a better response. It was not measured off axis.
On the driver #2 plot you will also see the H2 distortion. It rises below about 700Hz. This is true for both drivers, tho not shown. H3 is similar and on both drivers.
http://www.michael.mardis.com/images/288-511E-50dB.png
http://www.michael.mardis.com/images/288-D1.png
Good Work John !
Thanks Pano !Quote:
Originally Posted by Panomaniac
Great Stuff Guys !
Lots of impedance files .
Could you please export the main IR/FR files ( for Drivers #1 & 2 ) as text files ( & then post them here ) .
Thanks !
<> cheers EarlK
Hey Earl, sure can do.
Do you prefer any format? Values separated by comma, space, tab or semicolon?
You can see why I don't consider the 511 a true 500Hz horn. 600-650, maybe. I see the same results on the normal 1" version.
We did not measure efficiency of the horns, other than relative. The T-350 looks to be about 4-5dB less sensitive than the 288/511E at the same drive voltage.
No acoustic measurements of the 416 drivers as the box isn't built yet. That is the least of our worries at the moment. I have enough measurements of mine to get us started.
Use the same format that you used for the other text files (Z) which are posted above .Quote:
Originally Posted by Pano
- I've already successfully imported those ( to REW ) / so that's a good format to use .
<> cheers
OK, here are the FR files as tab separated text. All in 1 zip file.
Looking at them again, I can see that my graphs above have 1/3 octave smoothing on the far off-axis plots. Fixed that on this export. Everything is 1/6th octave. 200-24000Hz
Thanks Earl I can't stress enough about Pano's patience and assistance. I essentially Burned up his Sunday afternoon.Which allowed me to get up and running much,much,quicker.Thanks Michael ! :coffeedrinker:Quote:
Originally Posted by Earl K
Will get the rest of the measurements done this afternoon.I have a almost New Pristine pair of 416-8B's coming today from California.So when they get here, I will measure them up and hope they will be a better match for the new ones I already have.Thanks Guys ! :thankU:
BTW: GM thinks that the 500 Hz XO point will be a stretch at best so I'm thinking about 650- 700 Hz what do you guys think.