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Old 24th January 2013, 09:53 PM   #41
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Thanks Helmuth!
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Old 24th January 2013, 10:33 PM   #42
tvrgeek is offline tvrgeek  United States
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Please note, my favorite little program, WinISD, is only good at guessing LF response in various boxes. It can't help at all with the high end roll-off and breakup issues. It can't help tell you about OB problems as that is a design of the baffle issue. IB can be simulated by a monstrously large sealed box. You have to MEASURE yourself the rest.

Don't know what speaker Helmuth has the plots for, but look at the scale! It would be embarrassing if this was one of the fore-mentioned raved about JBL's.
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Old 24th January 2013, 11:37 PM   #43
Helmuth is offline Helmuth  Netherlands
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Originally Posted by tvrgeek View Post
Please note, my favorite little program, WinISD, is only good at guessing LF response in various boxes. It can't help at all with the high end roll-off and breakup issues. It can't help tell you about OB problems as that is a design of the baffle issue. IB can be simulated by a monstrously large sealed box. You have to MEASURE yourself the rest.

Don't know what speaker Helmuth has the plots for, but look at the scale! It would be embarrassing if this was one of the fore-mentioned raved about JBL's.
Sim of JBL2226G an the beyma 15lx60v2. both in same volume and br-tuning, as you see they are almost identical. Only the linear extrusion of the beyma is much bigger then the older jbl. So the beyma will have also low THD at high volume.
And again the beyma wins in the subbas area.

The rolloffin winisd is the result of the voice coil induction. It can be flat response in practice above the rolloff what you see in the simulation.

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Old 25th January 2013, 06:11 AM   #44
DougL is offline DougL  United States
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Don't know what speaker Helmuth has the plots for, but look at the scale! It would be embarrassing if this was one of the fore-mentioned raved about JBL's.
Unfortunately all of the drivers have to obey the laws of physics.
This is all about trade offs.
The 15" pro mid-ranges trade low base extension and upper frequency cone breakup for efficiency and low distortion. Is it a good trade? I don't know. It depends on the skill of the designer and the style of the music, I suspect.
The Beyma looks like a great woofer.

Thanks to all who responded so far.
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Old 25th January 2013, 11:30 AM   #45
Helmuth is offline Helmuth  Netherlands
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Unfortunately all of the drivers have to obey the laws of physics.
This is all about trade offs.
That is precise where it comes to. I have simulated a hole lot the last 10 years.

When you want more efficiency you get less subbas and the same the other way around.

I like beyma because they spec the second and third harmonic so one can get a idea of what you get.
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Old 25th January 2013, 01:56 PM   #46
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That is precise where it comes to. I have simulated a hole lot the last 10 years.

When you want more efficiency you get less subbas and the same the other way around.

I like beyma because they spec the second and third harmonic so one can get a idea of what you get.
That's why I liked the look of the 15P80Fe.
THD in the low bass seems quite a bit lower than the 15LX60V2 although roles are reversed between 80 and 180Hz or so. They cost 155 and 130 (LX60) without VAT here respectively.
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Old 25th January 2013, 02:39 PM   #47
Helmuth is offline Helmuth  Netherlands
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For higher efficiency. 99dB wmtr -6dB 35HZ

Beyma 15lw30

And

18 sound 15MB606

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File Type: png Schermafbeelding 2013-01-25 om 15.41.34.png (33.4 KB, 2171 views)
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Last edited by Helmuth; 25th January 2013 at 02:42 PM.
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Old 25th January 2013, 08:51 PM   #48
Helmuth is offline Helmuth  Netherlands
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15mb606
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15lw30
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Old 27th January 2013, 09:47 AM   #49
Helmuth is offline Helmuth  Netherlands
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We have to support the Greek economy to , look at the oberton 15b500.
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and a other nice one 18sound 15nw530.

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