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The Monolith open baffle planar servo sub speaker http://www.dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=902 |
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Author: | HAL [ January 6th, 2018, 5:18 pm ] | |||
Post subject: | Re: The Monolith open baffle planar servo sub speaker | |||
Installing the drivers and wiring.
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Author: | HAL [ January 7th, 2018, 10:24 am ] | ||
Post subject: | Re: The Monolith open baffle planar servo sub speaker | ||
Drivers installed and wiring for the speakers is done. Now for some testing.
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Author: | HAL [ January 7th, 2018, 5:46 pm ] | ||
Post subject: | Re: The Monolith open baffle planar servo sub speaker | ||
The first servo sub is working and trying out the test setup with a ground plane measurement. Will do a nearfield measurement to see if things are working as they should.
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Author: | HAL [ January 8th, 2018, 12:07 am ] |
Post subject: | Re: The Monolith open baffle planar servo sub speaker |
The nearfield measurement of the upper woofer looks good, so off to building the second 2x12. |
Author: | HAL [ January 8th, 2018, 10:38 pm ] | ||
Post subject: | Re: The Monolith open baffle planar servo sub speaker | ||
The second 2x12 H-Frame is loaded with servo drivers. Now starts the last wiring. Both HX300 amps are working.
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Author: | HAL [ January 9th, 2018, 6:08 pm ] | |||
Post subject: | Re: The Monolith open baffle planar servo sub speaker | |||
Both subs are now running and measurements looks good. Now to experiment with the digital crossover for the OB planar head.
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Author: | Pelliott321 [ January 9th, 2018, 10:05 pm ] |
Post subject: | Re: The Monolith open baffle planar servo sub speaker |
What is the reason for reversing one woofer. I assume they are firing in the same direction |
Author: | HAL [ January 9th, 2018, 10:38 pm ] |
Post subject: | Re: The Monolith open baffle planar servo sub speaker |
Yes, both are firing the same direction. From Sigfriend Linkwitz it helps lower harmonic distortion, if I am understanding the information. His W-Frames use the same concept. |
Author: | tomp [ January 9th, 2018, 10:49 pm ] |
Post subject: | Re: The Monolith open baffle planar servo sub speaker |
If you look at the photo you will see that one driver is pointed in the opposite direction from the other. If they were wired in phase one would cancel the other as the cones would be moving in opposite directions. By reversing the polarity of one in relation to the other the cones will move in the same direction at the same time. This does tend to reduce 2nd order harmonic distortion although I am not clear on the mechanism why that happens. In reality, the most important thing to do for distortion reduction is to keep the driver within XMax limits. |
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