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Piece of Aluminum Offboard? What's that? [message #71904] Sat, 24 March 2012 19:31 Go to next message
Bill Epstein is currently offline  Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA
Illuminati (2nd Degree)
Have I forgotten a big piece of metal on the crossover? Haven't looked at it in some years and can't find the schematic. R3?
Re: Piece of Aluminum Offboard? What's that? [message #71905 is a reply to message #71904] Sun, 25 March 2012 06:29 Go to previous messageGo to next message
Nick77 is currently offline  Nick77
Messages: 44
Registered: February 2011
Location: Austin
Baron
He was reffering to the large 100 watt resistor with aluminum heat sink.
Re: Piece of Aluminum Offboard? What's that? [message #71907 is a reply to message #71905] Sun, 25 March 2012 09:01 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18787
Registered: January 2001
Illuminati (33rd Degree)

Resistor R3 is the big resistor that mounts off-board and connects to the two spade lugs in the lower left corner of the PCB. It is used on three π and four π speakers, except with the TD12S. It's not used in the one π, two π, six π or seven π models though.

http://www.PiSpeakers.com/Pi_Crossover_PCB.gif
Re: Piece of Aluminum Offboard? What's that? [message #71921 is a reply to message #71907] Mon, 26 March 2012 10:11 Go to previous messageGo to next message
Bill Epstein is currently offline  Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA
Illuminati (2nd Degree)
I couldn't recall having one of those big aluminum hundreds 'cause I din't:

index.php?t=getfile&id=752&private=0

Used 4- 25 ohm cementos.
Re: Piece of Aluminum Offboard? What's that? [message #71922 is a reply to message #71921] Mon, 26 March 2012 11:06 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18787
Registered: January 2001
Illuminati (33rd Degree)

Oh, yeah. Now that you show me that picture, I remember seeing it before. Now I remember you talking about substituting that monster block with a group of ten-watters, totally fine 'cause you're running tube amps.

But those are 8Ω resistors, aren't they? Looks like they're in series-parallel, so you'd want 8Ω parts. Might wanna get out your handy-dandy meter and check across R3 to see.

Re: Piece of Aluminum Offboard? What's that? [message #71923 is a reply to message #71922] Mon, 26 March 2012 16:39 Go to previous messageGo to next message
Bill Epstein is currently offline  Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA
Illuminati (2nd Degree)
Too lazy to open her up and it's been a long time since I had to have parallel and series explained to me as bare naked resistors on the beach.... Laughing
I ohmed the speaker terminals and got 9 on one, 10 ohms on the other speaker which is interesting 'cause the left channel with 10 ohms always seems to have a dB or so more output.
Re: Piece of Aluminum Offboard? What's that? [message #71926 is a reply to message #71923] Mon, 26 March 2012 18:16 Go to previous messageGo to next message
Bill Epstein is currently offline  Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA
Illuminati (2nd Degree)
Oops! That's 8 Ohms 10 WATTS parts to = 8Ohms.
Re: Piece of Aluminum Offboard? What's that? [message #71928 is a reply to message #71926] Mon, 26 March 2012 19:57 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18787
Registered: January 2001
Illuminati (33rd Degree)

OK, good. So all four resistors connected series/parallel to form R3 are 8Ω, right? That's good, it will make 8Ω total, just what you want.

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