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Anyone making Apogee bass panels ?
Anyone making Apogee bass panels ?
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Old 22nd June 2020, 03:04 PM   #241
RogerGustavsson is offline RogerGustavsson  Sweden
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Quote:
Originally Posted by DAMIC View Post
I think there is not grams but milligrams or so ??
No, it should be grams. It must exceed the mass of the foil.
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Old 22nd June 2020, 05:15 PM   #242
DAMIC is offline DAMIC  Serbia
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Мy bad, I thought about tweeter mass.
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Old 22nd June 2020, 05:18 PM   #243
RogerGustavsson is offline RogerGustavsson  Sweden
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What tweeter are you refering to? Diva? Scintilla? The Duettas are not low mass.
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Old 22nd June 2020, 05:39 PM   #244
DAMIC is offline DAMIC  Serbia
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About 6-7 years ago i changed mrt's on my Stages, alu foil with capton backing was very light. As I remember, stretching force for montage was 92 grams.
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Old 23rd June 2020, 05:42 AM   #245
RogerGustavsson is offline RogerGustavsson  Sweden
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Well, very light it is not. The aluminium foil of the Diva tweeters or the Magnepan ribbon tweeters are low mass but still about the same as a dome tweeter.
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Old 29th July 2020, 07:11 PM   #246
AVWERK is offline AVWERK  United States
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7F866540-DBB1-457A-B49B-97161F47800E.jpg

This is (1) Scintilla 1/2” tweeter out of 4 on this speaker system.

I am making the 1 ohm bass panels also and will post some pics later.

Cheers
David
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Old 30th July 2020, 03:59 AM   #247
DAMIC is offline DAMIC  Serbia
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Looks great, what is the thickness?
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Old 30th July 2020, 03:56 PM   #248
AVWERK is offline AVWERK  United States
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The stock Scintilla twt. is .0005” thick

477F59FE-3BC1-4E1B-A97D-174D0D07C712.jpg

This time around decided on .033” wide cut traces made up of 1/4” acrylic strips glued up to form a framing square and you just move it around to replicate exact magnet rows.
There were 3 rows that were off and closer together so this will shift all rows above those, so it’s important to match and transfer all rows exactly to make the best match per magnet panel.

Center to center magnet length total is 49 13/16”
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Old 30th July 2020, 04:10 PM   #249
AVWERK is offline AVWERK  United States
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8C8A97B7-DBBC-4575-9258-29A8C7CAAF22.jpg

Sanding down all surfaces with 400 grit on an acrylic block takes any rough cut marks down before the Kapton goes down and actually increases impedance slightly as a bonus

This panel wound up at 1 ohm and used the open return field to run some extra traces to bring the panel up to this impedance.
The rebuilt panel that was pulled off measured .9 ohms so I am in the ballpack
And close enough

This cutting template made the whole process much more simple and was able to reduce trace width down significantly compared to the Diva template with the routed traces shhhss , You live and learn..,

Regards
David

Last edited by AVWERK; 30th July 2020 at 04:36 PM.
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Old 9th August 2020, 01:20 AM   #250
AVWERK is offline AVWERK  United States
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I have a question on the air load on this new chassis for the Scintillas and if it might affect Bass response.
As you can see I have run stiffing ribs across and underneath each magnet row the same width as each magnet section

The original had steel flat braces 1” away on the back side area in the same horizontal configuration.
Also the tops and bottom ends of the magnet frame itself never touches the top and bottom frame structure and its the same on the Divas.

I could rout out and area under the steel magnet structure and leave a small center contact area so it can breath better and at the same time connect and glue this area to stiffen the magnet frame and wood frame at the same time

I want to attach top and bottom sections and was considering some big bullnose
reliefs on both sides with say a 2” center attachment area to simulate a more open area like the original design

I have bull nose rounded all the back side cutout area unlike the square edge stock versions and maybe this will aid in air movement in some way

So do you think this might affect air mass loading enough to worry about and if it reduces bass remember the frequency response on this model is set at least 15 dB above the rest of the spectrum and maybe a reduction is a plus here ?

Welcome some opinions824F9605-4DE4-4B22-B156-1B1DFAF87D22.jpeg
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