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Re: 7Pi Build 2014 [message #80480 is a reply to message #80478] Sun, 14 September 2014 19:16 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
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Registered: January 2001
Illuminati (33rd Degree)

That's true. The 2226H is wired with black positive. Connection polarity is shown in the notes on the crossover sheet.

Re: 7Pi Build 2014 [message #80481 is a reply to message #80480] Sun, 14 September 2014 19:22 Go to previous messageGo to next message
compaddict is currently offline  compaddict
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So I had it right the first time.
What about the clearance question?
Re: 7Pi Build 2014 [message #80483 is a reply to message #80481] Sun, 14 September 2014 21:30 Go to previous messageGo to next message
compaddict is currently offline  compaddict
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The two resistor leads were separated from the trace. Still sound terrible.
Re: 7Pi Build 2014 [message #80484 is a reply to message #80483] Sun, 14 September 2014 22:20 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18677
Registered: January 2001
Illuminati (33rd Degree)

I don't think it's a crossover problem. But I do wonder if there's a bracing issue, like the back panel perhaps. Or maybe something else in there is buzzing, like the gasket or even a loose wire touching the cone.

Try the sound with the midhorn disconnected. You'll lose vocals, and it will sound unnatural, sort of muffled. But if there's something buzzing in the midhorn, it will stop. If that works, then take the driver out of the midhorn and listen to it by itself. See if you can isolate the problem by a process of elimination.

Re: 7Pi Build 2014 [message #80485 is a reply to message #80484] Sun, 14 September 2014 23:43 Go to previous messageGo to next message
compaddict is currently offline  compaddict
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Will try that.
What is the proper clearance for the midrange driver and the panel it is mounted to?
Re: 7Pi Build 2014 [message #80486 is a reply to message #80485] Mon, 15 September 2014 08:10 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18677
Registered: January 2001
Illuminati (33rd Degree)

It's a zero-clearance fit. The gasket and the plate must fit snug. It's just that the cone cannot rub against anything. All panels must be braced too.

Re: 7Pi Build 2014 [message #80489 is a reply to message #80486] Mon, 15 September 2014 10:54 Go to previous messageGo to next message
compaddict is currently offline  compaddict
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So how much clearance between cone (at rest) and plate would be ideal?
And I have a mic and mic pre-amp coming today if that helps.
Re: 7Pi Build 2014 [message #80490 is a reply to message #80489] Mon, 15 September 2014 12:02 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18677
Registered: January 2001
Illuminati (33rd Degree)

We just don't want the cone to touch the mounting plate, or anything else for that matter. There is enough clearance between cone and mounting plate to prevent them from touching, as long as the gasket isn't excessively compressed or removed. The xmax is around 2mm-3mm (depending on the driver chosen), but the gasket is larger than that.

As an aside, the mechanical limit is much greater than that, so if you were going to throw a hundred watts at these speakers, the cone could strike the plate. So you can add a second gasket in front of the built-on one, if you want to. We sell them for that purpose. But really, these are hifi speakers, and probably wouldn't ever be pushed that hard. They'd be way over xmax, and that's not what you ever want to do.

My guess is your problem isn't from cone-to-plate interference. That would only happen at very high volume levels. It's more likely something else, like bracing or something inside the cabinet rubbing against the cone.

Re: 7Pi Build 2014 [message #80491 is a reply to message #80490] Mon, 15 September 2014 12:29 Go to previous messageGo to next message
compaddict is currently offline  compaddict
Messages: 86
Registered: April 2014
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The seal for the access panel is not optimum at the moment.. But it was before I tore into it because of the sound quality.
I'll pull the drivers and have a listen outside the box like you said.
Imaging is very bad as well. Something with phase I think. I switched back to some CL B&W BM330 so we could watch TV and all was back to normal.
Re: 7Pi Build 2014 [message #80492 is a reply to message #80491] Mon, 15 September 2014 16:23 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18677
Registered: January 2001
Illuminati (33rd Degree)

Please do keep us posted. The midrange quality of the seven π loudspeaker is the best I've ever heard, due in part to the horn loading and part due to its close proximity to the corner apex, which prevents self-interference. So whatever is going wrong must be severe.

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