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PostPosted: Thu Apr 20, 2017 3:51 am 
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Location: Lansing, MI USA
I actually cut the baffles without screwing them up! I don't think I have ever done that before.

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Front baffles cut.jpg


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PostPosted: Thu Apr 20, 2017 4:45 am 
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Nice! It's going pretty fast, too. I'm dying to see how it turns out!


- Stuart -

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PostPosted: Thu Apr 20, 2017 4:57 am 
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I hope to be doing measurements on Sunday or Monday. Hopefully I can finish the assembly tonight, then fit them to the wall tomorrow. Then I have a very busy Friday and Saturday where I'm probably not going to get anything done.

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PostPosted: Thu Apr 20, 2017 5:12 am 
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Here is the box model. The speakers have a volume of 108L. The ports are tuned to 33HZ. Which is perfect for a 3" (inside diameter) piece of 7" of PVC pipe!

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Box response.JPG


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PostPosted: Sat Apr 22, 2017 4:15 am 
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Nice to have something in those big holes!

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Speakers in wall.jpg


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PostPosted: Tue Apr 25, 2017 3:35 am 
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PostPosted: Tue Apr 25, 2017 9:13 am 
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The measurement set up.

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20170424_184321.jpg


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PostPosted: Tue Apr 25, 2017 12:36 pm 
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Pictures from measurements last night. Still have a bit of a learning curve. My mic seems to not be responding well above 9k. I don't think it should matter in the crossover design though.

Attachment:
IMG_0531.jpg
Attachment:
IMG_0532.jpg


Tweeter response

Attachment:
Tweeter resonse.JPG


Mid response

Attachment:
Mid response.JPG


Woofer response

Attachment:
Woofer response.JPG


The response graphs are made using both nearfield and farfield measurements and blended using Charlie Laub and Jeff Bagby's FRD Response Blender. You can download the program and a paper on the methodology used for these measurements here http://audio.claub.net/software/FRD_Blender/Blender.html


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PostPosted: Tue Apr 25, 2017 2:19 pm 
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crossover response.JPG
Here is the response graph for the crossover that I have designed. It is flat within 3db, but that jag at 200hz kind of bugs me, but it is in the measurement.


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PostPosted: Thu Apr 27, 2017 2:15 pm 
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I put together a crossover with parts that I had on hand. Some of them weren't exact (I used a 3uh inductor instead of a 3.7uh for example) I unwound some coils that I had for exact values and none of the capacitors were the exact value, but it made music and sounded pretty good! Here is a measurement of the speaker. My measurement microphone drops off severely above 10k.

Attachment:
Ful response of speaker.JPG


The layout of the crossover and the build of the crossover.

Attachment:
20170426_205843 (1).jpg


Attachment:
20170426_232718.jpg


The measurement system.

Attachment:
20170426_232729.jpg


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PostPosted: Sat Apr 29, 2017 11:30 am 
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Listening nirvana. I had no idea that these would sound this good!

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PostPosted: Sat Apr 29, 2017 12:19 pm 
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It looks fantastic, Eric! Congratulations! And I'm surprised at how fast you managed to put that all together, with such skill and craftsmanship! (Of course, I do understand all the weeks of work that went into the design first!)

Can't wait to see the final REW data, after all your tweaking is finished.

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PostPosted: Sat Apr 29, 2017 1:03 pm 
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This is stereo from the mix position. I have never heard imaging like this before!

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stereo from the mix position.png


Now I have to learn how to measure a room.


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PostPosted: Sat Apr 29, 2017 1:06 pm 
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Soundman2020 wrote:
It looks fantastic, Eric! Congratulations! And I'm surprised at how fast you managed to put that all together

- Stuart -


Especially considering how long the studio has taken. :yahoo:

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PostPosted: Sat Apr 29, 2017 2:00 pm 
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Quote:
Now I have to learn how to measure a room.
AHhh! Now we are talking about one of my favorite subjects! :) If you are interested in doing it the way I normally do (using REW), then PM me, and I'll send you the instructions I normally give to my paying customers on how to do that.


- Stuart -

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