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Why mount crossover components to separate board? [message #73769]

Mon, 10 September 2012 12:10

Silas
Messages: 12
Registered: August 2012
Location: Kirkland, WA

Chancellor

What is the reason behind mounting the crossover components to a board, and then mounting the board to the cabinet? Couldn't I just mount the components to the cabinet directly, a la below?

http://i464.photobucket.com/albums/rr10/FrostyPanda/P10001542.jpg

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Re: Why mount crossover components to separate board? [message #73770 is a reply to message #73769]

Mon, 10 September 2012 16:31

mantha3
Messages: 72
Registered: May 2012
Location: Lino Lakes, MN

Viscount

The board just makes it easier... Easier to do the x-over build and use the soldering iron. I like to use a 1/4" piece of something that I can drill holes in. Zip tie on Caps, Inducers since they are heavy... Goop em with silicone...

You can do what you are thinking direct and not use a board.

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Re: Why mount crossover components to separate board? [message #73771 is a reply to message #73770]

Mon, 10 September 2012 16:33

mantha3
Messages: 72
Registered: May 2012
Location: Lino Lakes, MN

Viscount

PS - I see 5 larger resistors in the middle. Are these the 100W spot? What are these?

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Re: Why mount crossover components to separate board? [message #73775 is a reply to message #73771]

Tue, 11 September 2012 03:36

Silas
Messages: 12
Registered: August 2012
Location: Kirkland, WA

Chancellor

mantha3 wrote on Mon, 10 September 2012 16:33

PS - I see 5 larger resistors in the middle. Are these the 100W spot? What are these?

Those are 5 20W, 40R resistors, to be wired in parallel to achieve 100W at 8R.

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Re: Why mount crossover components to separate board? [message #73776 is a reply to message #73775]

Tue, 11 September 2012 07:55

mantha3
Messages: 72
Registered: May 2012
Location: Lino Lakes, MN

Viscount

Ahhh, that is what I was thinking.

I did notice in the X-Over schematic by Wayne it mentions that this resistor R3 is "Mounted off board". Is this due to heat or something?

I'm going to be building soon and the X Over is something I'll do soon. Doing the 5 resistors like you will save some $$$ so I think I'll copy you on this.

Keep posting build stuff/photos. I'll do the same.

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Re: Why mount crossover components to separate board? [message #73778 is a reply to message #73776]

Tue, 11 September 2012 12:18

Silas
Messages: 12
Registered: August 2012
Location: Kirkland, WA

Chancellor

Will do. I'm actually keeping a build thread on AVS, titled something like "JBL and 4Pi theater...college style!" I won't link to it, but you can search for it if you like. PM me if you have any questions.

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Re: Why mount crossover components to separate board? [message #73806 is a reply to message #73776]

Wed, 12 September 2012 23:32

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

Sorry I missed this earlier:

mantha3 wrote on Tue, 11 September 2012 07:55

I did notice in the X-Over schematic by Wayne it mentions that this resistor R3 is "Mounted off board". Is this due to heat or something?

The R3 Zobel resistor we provide in the kits is packaged in a large aluminum block which serves both as a heat sink dissipator and as a mounting block. Our crossover PCB has a connector for this resistor, which is mounted off-board. We mount the crossover and Zobel resistor on the inside of the cabinet, directly on the bottom using a gasket to prevent vibration.