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Old 29th April 2013, 01:12 AM   #111
john65b is offline john65b  United States
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The bass panels can be re-tensioned, but I do not know what the target frequency is.

The vertical wooden clamp is likely the tension clamp, and has bolt tensioners probably like those in the vids for the Duettas.

If they are that bad and unlistenable, I would go ahead and experiment a bit with re-tensioning...
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Old 29th April 2013, 01:53 AM   #112
Davey is offline Davey  United States
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John,

I've pushed the .pdf into my ftp site for a few days. The info you're interested in is in the first few pages.

http://home.comcast.net/~dreite/temp..._procedure.pdf

Dave.
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Old 29th April 2013, 02:46 PM   #113
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Quote:
Originally Posted by john65b View Post
The bass panels can be re-tensioned, but I do not know what the target frequency is.

The vertical wooden clamp is likely the tension clamp, and has bolt tensioners probably like those in the vids for the Duettas.

If they are that bad and unlistenable, I would go ahead and experiment a bit with re-tensioning...
Can someone post links to appropriate vids please.
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Old 29th April 2013, 05:07 PM   #114
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Here is what my bad Caliper bass panel looks like. It works but makes horrible noises. It seems retensioning to the original spec should solve my problems. Also, if someone could post a link to a service manual or at least a schematic of the foil layout on the Caliper, unless they're all the same and then a generic foil layout would be nice.
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Last edited by audiomagnate; 29th April 2013 at 05:11 PM.
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Old 29th April 2013, 05:24 PM   #115
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Who and why has someone made a short circuit with copper?
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Old 29th April 2013, 05:46 PM   #116
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As to the who, I have no idea, I just took the covers off a few minutes ago. I'm guessing it was a repair done by a previous owner. Are those two bottom strips supposed to connected?
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Old 29th April 2013, 05:56 PM   #117
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No, they are not.
The circuit is supposed to make a double run with the aluminum.
Or else You will have half the resistance of the woofer and will make the filter cross over wrongly.
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Old 29th April 2013, 06:03 PM   #118
john65b is offline john65b  United States
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Check the resistance of the woofer panel. I think it should be around 3.1 - 3.4 ohms. If is is incorrectly jumpered, it will read less.
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Old 29th April 2013, 06:17 PM   #119
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I disconnected the jumper and resistance went to open so I re-jumpered the bottom stipe to the second from the bottom strip on the straight side and now bass panel resistance is 3.1 ohms. Some parts of the panel seem much more active than others. Is it or is it not possible to re-tension this driver?
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Old 29th April 2013, 06:32 PM   #120
taotao is offline taotao  Germany
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I guess your foil has a break in the circuit somewhere, look under the horizontal bars on top and bottom for a small crack in the foil.
Sorry, in my opinion you have to put new foil in your speakers.
Retensioning won't do it.
Beside the crack, the foil is very uneven, plus I suppose you've got the buzz.
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