Don looks to me like #9 & #10 are your closest matching pair followed by #7 & #8, #3 & #11 or #12
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HAGD,
Marc
Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...
TMWW thread
Maurbacs DCR Tower
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If you're building "Stent-a-likes" (6 drivers / enclosure), I'd suggest these 2 groups (I eye-balled your numbers off your graphs):
Group A: 1, 4, 6, 7, 9, & 10. Averages: Fs=49, Qts=0.51, Vas=0.19cf
Group B: 2, 3, 5, 8, 11 & 12. Averages: Fs=51, Qts=0.53, Vas=0.18
These 2 groups will box-model about the same as each other.
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Thanks for the input guys!
Stay tuned - T/S retests with Blu-Tak are coming out much different. I have new hope that this project will go forward with these drivers.
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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Originally posted by ecjThe four I received are reasonably close (no break-in):HAGD,
Marc
Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...
TMWW thread
Maurbacs DCR Tower
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Originally posted by ecjThe four I received are reasonably close (no break-in):“I cried because I had no shoes until I met a man who had no feet”
If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison
Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D
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So I'm almost finished with retesting - looks like the major problem was how I attached the 10G weights (2 US nickels) to the cone/dustcap.
(BLU-TAK is the best, with the intersection of the dustcap and cone as best position)
If I look at the units with large variations from the norm, the MMS is way off. Resting 2 and 3 times shows a more normal MMS, and then
the rest of the parameters fall in line. Final results soon.
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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Lots and Lots of LIMP yesterday. Got real good at applying nickels to cones.
Much more consistency, but a few drivers in the bunch that are definitely out of spec.
I tested some of the drivers 3 - 4 times, so I feel that results are good.
The project will move forward - sims will use the average vaiues, with out of spec drivers
matched left to right.
FS:
QTS:
VAS
MMS:
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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Even though #2 & #6 don't match the others, if you box-model them (ave of 2&6), you'll see that they almost perfectly match the others (ave of the other 10) as far as final Vb & F3 values go. IF Qts goes up, but Fs ALSO goes up, AND Vas goes down - they end up essentially modelling the same (exactly the way your data shows).
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Originally posted by Chris Roemer View PostEven though #2 & #6 don't match the others, if you box-model them (ave of 2&6), you'll see that they almost perfectly match the others (ave of the other 10) as far as final Vb & F3 values go. IF Qts goes up, but Fs ALSO goes up, AND Vas goes down - they end up essentially modelling the same (exactly the way your data shows).
Yeah, I thought that was pretty instructive - text book parameter shifts.
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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Originally posted by donradickLots and Lots of LIMP yesterday. Got real good at applying nickels to cones.--
"Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)
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Originally posted by Pallas View PostWhy use the nickels at all? I usually just weigh out poster putty and mash it flat.
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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The one I use cost under $10 on a site where PE also sells, and is very consistent though I haven't really calibrated it.--
"Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)
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thanks. Very good tip! I found that the little pieces of putty that I used to attach the nickels was .6g
Time to repeat the LIMP tests.
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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Finished another round of the "out of spec" drivers, results a bit more consistent, but I've still got several drivers as outliers,
so I'll match those left to right and top to bottom.
Now it's time to look for a nice high efficiency tweeter. I got excited about the H25 / H26 tweeters, then saw the rather high Fs.
I figure that I'll need to crossover the tweeter about 2500, since the woofer response is a bit unknown at this time.
Looking to spend about $30-35 and have 93db efificiency.
Actually, this Vifa ring radiator looks about perfect.
One thing that isn't clear from the specs is how loud a tweeter could play without damage or distortion.
Do I need to worry about that?
Any other suggestions?
http://www.parts-express.com/peerles...eter--264-1016
I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
"As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara
High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
My Voxel min sub Yet-another-Voxel-build
Tangband W6-sub
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