Mark Audio CHR-70 Application Thread - Page 22 - diyAudio
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Old 23rd July 2009, 11:48 AM   #211
_henry_ is offline _henry_  Australia
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Dave,

it looks good, is it possible to do with Alpair 10FR?

any estimation dimensions?

cheers
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Old 23rd July 2009, 02:54 PM   #212
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Sorry
Forgot to attach picture.
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File Type: jpg chr70 double box.jpg (73.9 KB, 1625 views)
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Old 23rd July 2009, 04:31 PM   #213
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Re the above cabinet, it's called Maeshowe. Can't release any details though at present; it's not an FH cabinet. As for response, flat or high-gain above nominal to mid 50Hz region depending on how it's used.
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Old 23rd July 2009, 05:09 PM   #214
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Quote:
Originally posted by _henry_
it looks good, is it possible to do with Alpair 10FR?
Maeshow is large. If even possible A10 variation would be huge. A ball park would be multiply the ratio of Vas by the size of Maeshow.

Martin has designed an A10 horn, that should be fine once the excess bass has been figured out.

Details of how full Maeshow plans (with a few others we have had in hiding) will be made available will be announced after Scott & i figure out the timimg & the details.

It is 5' tall.

dave
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Old 23rd July 2009, 06:24 PM   #215
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has the A10 been enabled already?
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Old 23rd July 2009, 10:25 PM   #216
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Default Re: 2 HareBrained: Please Help

Quote:
Originally posted by Voldemar1


Hi John,
I had no experience in speakers design; just trying to reproduce your design. Could you please review my dimensions?
  • Iím not sure that ports are right size.
  • Speaker is centered by tom chamber, so it slightly closer to one of the sides. Can I place speaker (vertically) in the middle of front baffle?
  • What the right place of the center port? Numbers on picture (9 5/64 and 10 27/64) are wrong. What are right ones?

If you want I can send you my Google sketch up file.
Thank you,
Vlad

Quote:
Originally posted by Voldemar1
Sorry
Forgot to attach picture.
I think what you're seeing within Sketchup is the measurement marker being off the edge a bit.

Not that it matters, but I had the top and bottom pieces running the full width (8.5"). For me, this simplified cutting. Given that, here's the cut list:
* All pieces from 0.5" material.
* Ports are 0.75"x4".
* Front & Back: 8.5" x 21.5"
- Driver center loc: 3.75" from side & 6.5" from end, off center to avoid inter-chamber port.
* Interior pieces are all 4" wide:
- Top & Bottom: 8.5" (#2). Overlaps both sides. Front and back overlap these.
- Long side: 20.5"
- Side Between Ports: 7.75". Overlaps port walls.
- Side Port to Top: 11.25"
- Horizontal port walls: 6.75" (#3)
- Vertical port wall: 9".
- Bottom port extension: 1.5". Port wall overlaps end of this.
- Interior chamber port extension: 1.25. Port wall overlaps end of this.
* Suggest making back removable to allow stuffing adjustments.
* I doubled the amount of acousta-stuffing in driver chamber to mellow ripple.

Qs Answered:
The driver can be lowered some. The port exit may be too close to the driver. You want the sound to interact with the chamber before entering the port. You could try it in the middle (given sufficient clearance behind the driver), and maybe at 4"-4.25" to give the inter-chamber port more room. My driver height was chosen because of my ear height above my desk. The overall height/shape was chosen because I had room. If this shape doesn't work for you, it can be altered. It's the volumes that are more important.

The top of the "center" port is 11.75" from the top edge. Putting the top edge of the horizontal port wall that helps form that port at 12.5" down from the top.

That should help.
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Old 24th July 2009, 01:58 AM   #217
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Quote:
Originally posted by human.bin
has the A10 been enabled already?
No. They are next.

dave
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Old 24th July 2009, 04:46 AM   #218
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Default Re: Re: 2 HareBrained: Please Help

Quote:
Originally posted by HareBrained


I think what you're seeing within Sketchup is the measurement marker being off the edge a bit.

....

Hi John, thank you very much.
I think I got it now.
Bought plywood today, will update sketch tomorrow.


Vlad.
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Old 25th July 2009, 07:47 AM   #219
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Here it is.
I'll make terminals cup in second chamber to allow stuffing adjustments.

All wood are 0.5"
All ports are 0.75"
Sides are 4"
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File Type: jpg chr70 double box. v.2jpg.jpg (92.0 KB, 1381 views)
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Old 25th July 2009, 08:07 AM   #220
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Voldemar1,

I have a few CHR-70's. I have not yet decided on the enclosure for them. Thank you for sharing your design. But can you tell me why should I want build this enclosure instead of a standard BR? A standard ported design will give me an F3 of about 37 Hz in a smaller less complicated box. What is the benefit of building your box? I am not asking this to be disrespectful of your design. I just want to understand how the benefits of this design justify the additional cost, complexity and size. In short, is it worth the effort and why?

Thanks,
Steve
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