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Old 17th January 2018, 11:18 PM   #201
tommydoan84 is offline tommydoan84  United States
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Thank you for the feedback, scottjoplin. I will do things the right way. I will install the drivers to the flat plywood panel and report back what my impression about the drivers.

Regards,
Tom
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Originally Posted by scottjoplin View Post
If the driver is lying flat on the desktop you'd have been getting a lot of very early reflections, you really can't tell what it sounds like in that situation
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Old 18th January 2018, 04:46 AM   #202
Variac is offline Variac  Costa Rica
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And keep the panel at least a meter from the front wall and the panel vertical, ie the drivers pointed at you.
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Old 11th February 2018, 02:46 PM   #203
tommydoan84 is offline tommydoan84  United States
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A few updates
- Ideas: inspiration from PureAudioProjects and laverda. I used 2 Eminence 15 Beta and SAL driver for OB model
- Xover: Using Frank's passive model

I finished 1 set of OB and have an audition last night. The sound is not what I was expecting it to be. The sound is very thin, imaging and soundstage is collapsing. There is a little bit bass but not much. The sound is not airy and open, it sounds like there's a big curtain or a wall in front of the drivers.

I even used a U frame model and pull the speaker 1 or 2 meter away from the wall but the sound is not improving.

This is the 1st time that my DIY experience is somewhat discouraging and not what I expected to be after so much effort, time and money spent. However, I will continue to try different thing if there is any to really improve sound much further. I know and I can feel it's almost there just a little bit of push to get there

I have a few things that I'm thinking to try
- getting a miniDSP UMIK-1 Omni-directional to measure out the frequency response of the OB driver
- Trying out Nelson's passive Xover to see if it makes any difference
- Remove the 2 wings
- Last: trying out active crossover and bi-amping. I was hoping to get good result with passive Xover first to use it as a reference before going to active Xover

If you have ideas or suggestions, please let me know.
Appreciate the inputs as always.
Best,
Tom

[IMG][url=https://flic.kr/p/24fLgSn]Click the image to open in full size. [/IMG]

[IMG]Click the image to open in full size.My_OB03 [/IMG]

[IMG]Click the image to open in full size.My_OB01 [/IMG]

[IMG]Click the image to open in full size.My_OB02[/IMG]
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Old 11th February 2018, 06:04 PM   #204
planet10 is online now planet10  Canada
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I have that same Maxell poster, and am currently using the same amp.

From the picture of the back of the baffle it looks like you need to relieve the back of the driver cutout.

An example attached.

dave
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File Type: jpg Baffle_rear_and_J6_cup.jpg (64.7 KB, 270 views)
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Old 11th February 2018, 06:25 PM   #205
tommydoan84 is offline tommydoan84  United States
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Thanks for the feedback Dave!
You mean I need to remove the left and right wing of the baffle, right?

Thanks
Tom

Quote:
Originally Posted by planet10 View Post
I have that same Maxell poster, and am currently using the same amp.

From the picture of the back of the baffle it looks like you need to relieve the back of the driver cutout.

An example attached.

dave
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Old 11th February 2018, 06:35 PM   #206
silasmellor is offline silasmellor  Denmark
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I think he means you need to chamfer the driver cutout of SAL to let it breathe.
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Old 11th February 2018, 06:36 PM   #207
planet10 is online now planet10  Canada
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What Silas said.

dave
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Old 11th February 2018, 06:51 PM   #208
bk856er is online now bk856er  United States
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Quote:
Originally Posted by silasmellor View Post
I think he means you need to chamfer the driver cutout of SAL to let it breathe.


Just to further clarify, a roundover bit with a router is the usual method.


But can this really make such a remarkable difference?


BK
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Old 11th February 2018, 07:00 PM   #209
planet10 is online now planet10  Canada
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We use a 45į bit to get an even greater relief. It can make a considerable difference, removing an oil can resonance and reducing early reflections back thru the cone.

dave
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Old 11th February 2018, 08:03 PM   #210
bk856er is online now bk856er  United States
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The 45 bit makes sense for even great relief, especially if there's enough thickness left to securely attach the driver.


I scrolled through the thread and noted that the none (?) of the examples used a backside relief. Some also mounted the driver inset and flush with the baffle, and some simply attached it to the baffle. What are the best practices here? I usually do both.


I'm not building this speaker, at least not yet, just curious...


BK
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