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ZOB active experiment (Read 3412 times)
Lon
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Re: ZOB active experiment
Reply #15 - 08/15/14 at 23:17:48
 
Those look great! Good work!
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Brian
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Re: ZOB active experiment
Reply #16 - 08/16/14 at 03:41:53
 
Those are beauties!
How do you like the sound?
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Kimppe
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Re: ZOB active experiment
Reply #17 - 08/16/14 at 17:52:24
 
The sound is great! The bass is much stronger than I expected.
They are passive now. In the end I didn't put the hypex in these. I just have an ordinary NAD amp driving the Seas elements. They are quite sensitive though so 25% all ready start to hurt my ears. I haven't done any measurements yet. Also I have the opening full open in the back. I need to find some good material to play when I start tuning.
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Kimppe
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Re: ZOB active experiment
Reply #18 - 08/16/14 at 18:03:28
 
Another thing is how "acoustic" the bass sounds. and one gets that airy feeling that I was looking for when I decided to build open baffles. So very enthusiastic now !
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image_014.jpg
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Kimppe
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Re: ZOB active experiment
Reply #19 - 08/16/14 at 18:35:02
 
I'll post a few pics
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image_015.jpg
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Kimppe
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Re: ZOB active experiment
Reply #20 - 08/16/14 at 18:36:24
 
So you can see how I did the wiring
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image_016.jpg
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Kimppe
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Re: ZOB active experiment
Reply #21 - 08/16/14 at 18:37:51
 
And then hid it behind the felt. Also You can see how I have fastened the front baffle to the cabinet
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image_017.jpg
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Kimppe
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Re: ZOB active experiment
Reply #22 - 08/16/14 at 18:40:16
 
Only two screws at the back.
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image_018.jpg
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Lin
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Re: ZOB active experiment
Reply #23 - 08/17/14 at 00:55:58
 
Kimppe wrote on 08/16/14 at 18:03:28:
Another thing is how "acoustic" the bass sounds. and one gets that airy feeling that I was looking for when I decided to build open baffles.


I agree. Cool

Nice looking speakers.


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« Last Edit: 08/17/14 at 00:57:24 by Lin »  
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Kimppe
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Re: ZOB active experiment
Reply #24 - 08/21/14 at 07:04:24
 
I measured the ZOB yesterday with a borrowed kit for measuring speakers. The software I used was HOLMImpulse. The microphone was a Dayton EMM-6. HOLMImpulse reads the calibration file for the microphone so it should be out of the measurement. The amp, speaker and microphone where connected to a "red box" that I was told should take the amp out of the measurement too.

That leaves the DAC and the speaker and the room. The DAC was a M-Audio Transit and the room a normal living room.

The blue line was measured 4 inch from the element.
The red line was measured i our sofa by my right ear.
THe green line was measured at the port opening at the back of the speaker.

http://www.berlins.fi/zob/ZOB_measure_4_2014-08-20.JPG

In the second picture
the blue line was measured ~1m in front of the speaker
the red line 15 degrees off axis
the green line 30 degrees off axis.

http://www.berlins.fi/zob/ZOB_measure_2_2014-08-20.JPG
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« Last Edit: 08/21/14 at 07:39:00 by Kimppe »  
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Steve Deckert
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Re: ZOB active experiment
Reply #25 - 08/22/14 at 03:49:18
 
Wow, great job! Very impressive, especially the measurements.  It's excellent to see other peoples measurements and how they compare.   My measurements of the ZOB were done with the FRX drivers and the response you've gotten is amazingly similar.  It shows how much a cabinet actually effects the response of a given driver.

Here is the FRX response in the ZOB in our listening room.



What is probably more fascinating is comparing your response to the published response of the SEAS driver:



Your response is quite a bit better.



Congratulations on a job well done!
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Kimppe
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Re: ZOB active experiment
Reply #26 - 08/22/14 at 12:40:42
 
Thank you for the response!
And thanks for the amazing design!!

I started to look at the measuremnet of the FRX you posted and started to see more and more similarities.

I couldn't keep my self from editing the measurements on top of each other. I scaled the axes so they were the same and shifted up your entire measurement a bit. I also did the 1/12 ocatave smoothing om my measurement. As a curiosity in red color I loaded an old measurement of the plywood baffle seen in the beginning of this thread Smiley.

By the way, I do not know how much power I was taking out of my amp when I was making my measurement. The volume was high. I did wear ear protection, but I'd say that it was still at party listening level (whatever that means).


http://www.berlins.fi/zob/ZOB_originalTestOB_FRX_copypaste.JPG
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« Last Edit: 08/22/14 at 13:48:51 by Kimppe »  
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Brian
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Re: ZOB active experiment
Reply #27 - 09/01/14 at 11:52:43
 
Kimppe said:
"Another thing is how "acoustic" the bass sounds."

I like that a lot!
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Kimppe
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Re: ZOB active experiment
Reply #28 - 09/03/14 at 19:22:25
 
Yes. I like it alot too!
I've been digging out every old Jazz record I have and I'm amazed how invisible the speakers are and how well I can listen to individual instuments or components of the music.

Do you think the model SE84CKC Super Zen Triode 2 watts stereo is fine for my elements?
The Seas FA22RCZ have a characteristic sensitivity (2,83V, 1m) of 94 dB.
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hdrider
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Re: ZOB active experiment
Reply #29 - 09/07/14 at 19:39:23
 
Thank you for the posts on your project! I have been researching OB with a focus on Steve's of course and this is great material. You made some great looking speakers and I am glad they sound good and work in your room. Keep us posted and yes I think Steve's 2 watter will do great on your speakers.
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