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Old 28th February 2006, 07:09 PM   #1
reins is offline reins  Germany
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Default Lambda 15" Dipole up to 1100Hz

Hi,

is it a good idea to use the Lambda dipole driver as midrange and crossing at 1100 Hz to the Seas H1212?

First sound impression is quite good, not that much difference to the 3-way setup. but as I haven't good measurement equipment, I cannot get the details (distortion figures etc.).

Any comments on such a setup?

Thanks
Stephan
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Old 1st March 2006, 01:09 AM   #2
JinMTVT is offline JinMTVT  Canada
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i have been asking the same question all over the place since 1 year now

everybody will probably tell you that it is not a good idea,
and that the 15" drivers is not able to accuratly deliver quality sound at that speed of movement ..

i'd personally say that 1100hz is quite high,
but most pro manufacturers rate their 15" up to 2Khz

so i don't see why you couldn't use it as u wish!!!

if you like the sound, just keep it as is!!!

Sure feels weird thought to make a big mass like that move at 1000 times per second and more !!!
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Old 1st March 2006, 01:43 AM   #3
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The 15" coax I use on OB has an XO point of 3500hz. BTW only the center portion of the cone moves at high frequency. The Lambda's are definitely on my short list once they can be purchased in a reliable manner.
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Old 1st March 2006, 01:26 PM   #4
JohnL is offline JohnL  United States
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Here is some off-axis plots of a td15x prototype. The 3 traces are on axis, 30 degrees and 45 degrees. That is with the driver mounted in a 17" wide cabinet. It doesn't exactly beam like a normal 15, but it does beam. It looks like 1100 might be OK.
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Old 1st March 2006, 02:40 PM   #5
JinMTVT is offline JinMTVT  Canada
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please elaborate on all the above!!!!

need more info!
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Old 1st March 2006, 04:10 PM   #6
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Quote:
Originally posted by JinMTVT
please elaborate on all the above!!!!

need more info!
http://dan.hersam.com/opinions/exclamation.html

Is your exclamation mark key stuck?

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Old 1st March 2006, 04:37 PM   #7
reins is offline reins  Germany
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Quote:
Originally posted by JohnL
Here is some off-axis plots of a td15x prototype. The 3 traces are on axis, 30 degrees and 45 degrees. That is with the driver mounted in a 17" wide cabinet. It doesn't exactly beam like a normal 15, but it does beam. It looks like 1100 might be OK.

Thanks for the diagram, is looks ok, up to 1kHz.

I checked non-linear distortion with a 800 Hz sine wave. Looked also ok, -60dB, but done with a very simple setup.

Has anyone an idea what linear distortion might look like?

Stephan
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Old 1st March 2006, 07:00 PM   #8
JinMTVT is offline JinMTVT  Canada
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Quote:
Originally posted by ShinOBIWAN


http://dan.hersam.com/opinions/exclamation.html

Is your exclamation mark key stuck?


ahhaha shinob
i like to use the !!!! when i am excited!!!
nice link !


Shino i want ur idea on this topic!!
can a 15" or multiple in open baffle
be used for woofer and higher effectivly and with audio quality ?
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Old 1st March 2006, 11:16 PM   #9
AJinFLA is offline AJinFLA  United States
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Reins,

if you are going to use those drivers and xo, I would strongly suggest using a waveguide to load the tweeter and reduce directivity (and distortion at 1k). The SEAS is very robust, but thats really pushing it. I'm sure you don't have a 15" Lambda to listen at very low volumes .
Hifitalo http://www.hifitalo.fi/ sells one made for the H1212. Good luck.

Cheers,

AJ
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Old 2nd March 2006, 06:47 PM   #10
reins is offline reins  Germany
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Quote:
Originally posted by AJinFLA
Reins,

if you are going to use those drivers and xo, I would strongly suggest using a waveguide to load the tweeter and reduce directivity (and distortion at 1k). The SEAS is very robust, but thats really pushing it. I'm sure you don't have a 15" Lambda to listen at very low volumes .
Hifitalo http://www.hifitalo.fi/ sells one made for the H1212. Good luck.

Cheers,

AJ

I tested it, it works very very well. Best is the imaging of the setup. I think the waveguide is a good idea independent if I go 2-way or 3-way.

Thanks
Stephan
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