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PostPosted: January 6th, 2018, 6:56 pm 
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HAL wrote:
It is a 7 way speaker with 2 crossover points. The rest are time delay differences.

Still deciding on what they are exactly at this point. Approximately 150Hz from subs to planars and 6KHz from planars to ribbons.


150Hz for planars sounds too low. I would high pass the planars at least 1 octave above their resonance. Dont go by FR curves, go by your ear.

When do we get to hear them?

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Shashi


Last edited by Cogito on January 6th, 2018, 7:12 pm, edited 1 time in total.

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PostPosted: January 6th, 2018, 7:11 pm 
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Are you going to use amplitude shading in addition to the delays like in the cbt36k to minimize floor bounce.


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PostPosted: January 6th, 2018, 7:14 pm 
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No, the beamformer should have the sidelobes down 13dB from the mainlobe with the existing setup.


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PostPosted: January 6th, 2018, 7:16 pm 
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The Neo10's in the baffle are fine down to 150Hz with the baffle and EQ. Plenty of power handling capability. Have been doing it for quite awhile with the smaller version.


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PostPosted: January 7th, 2018, 12:55 pm 
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Cogito wrote:
When do we get to hear them?


Once I have both of the speaker systems up and running, will have a gathering for listening. Not much room in my listening room, so the second system will be for folks in another room.


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PostPosted: January 21st, 2018, 9:13 pm 
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Finally back from on and off travel since after Thanksgiving! :o Wife is gone until 17 Feb on travel!

Have been testing the new measurement system and will be giving that a try this week with the line arrays. Then some crossover tweaking.


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PostPosted: January 28th, 2018, 11:29 pm 
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Finished getting Windows 10 1709 loaded on the music server and software is up and running for measurements.

With the new version of REW, it now has support for 192KHz sample rate operation. This means all speaker measurements with it are at the native processing rate of the digital crossover. Using the Earthworks M550 mic and 1021 mic preamp into the ADC will give full minimum phase measurement capability for the system.

Will be doing measurement trials on Monday and see what is now possible with the new system.

There is also improved support for MathAudio RoomEQ for HiRez measurements as well. This will be part of the measurement trials.

First will be finishing the adjustments to the digital crossover for flattest response before any correction is applied.


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PostPosted: February 9th, 2018, 6:37 pm 
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Had a day to make some measurements on The Megaliths and do some response tweaking.

The is the Audiomatica Pocket CLIO frequency response of the left speaker at my listening location 8' from the array. Still have some room interaction to work on, but very nice compared to others in my room without any room correction system running at all.


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Megalth left channel freq response-small.jpg
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PostPosted: February 9th, 2018, 6:48 pm 
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That 10db suck out at 50hz will be hard to deal with. Never have seen that before. Usually there is a peak there. What are the room demensions? Where is the woofer in relation to the long demension?


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PostPosted: February 10th, 2018, 12:35 am 
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The ceiling is 10' high and the 6x12" servo woofer array is 7.5' tall. The sub array is about 1/2 way the 25.2' length.

Probably need to build a bass absorption system for the ceiling across the 16' width, 1/2 way between the subs and seat and see what happens to the null measurement. I can EQ the peak down at ~22Hz.


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