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7pi crossover plans [message #51994] Wed, 09 April 2008 15:34 Go to next message
DICK is currently offline  DICK
Messages: 17
Registered: May 2009
Chancellor
Wayne for some reason when I open up the email for the 7pi with midhorn plans the crossover document does not show. Could you send it again please? Thanks
Rick

You've got mail! [message #51995 is a reply to message #51994] Wed, 09 April 2008 19:19 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

If you still can't see the crossover, try opening it in a paint program.


Re: You've got mail! [message #51996 is a reply to message #51995] Thu, 10 April 2008 13:14 Go to previous messageGo to next message
DICK is currently offline  DICK
Messages: 17
Registered: May 2009
Chancellor
Yes sir I did that and then I could print it thankyou. Now I got a question about the crossover. Since I'm using a 2226 in a bass bin to the midrange horn, am I following the schematic for the 4pi up to the woofer, then pick up from there with the schematic for the 7pi midhorn & tweeter? Also I'm a little vague with the tweeter since I'm using the b&c 250. Will R1 & R2 require higher ohm's? And what mH would L2 need. And is the tweeter's polarity normal or reversed? You bet-cha I'm cornfused. Thanks Wayne.
Rick

Driver polarity [message #51997 is a reply to message #51996] Fri, 11 April 2008 11:41 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)

The black terminal is positive on the B&C DE250. The JBL 2226 is also connected with the black terminal being positive. The Delta 10 positive terminal is labeled "+".

Some compression drivers are connected internally with the diaphragm moving "forward" (away from the magnet) with positive voltage applied to the red terminal. Others are connected so there is positive pressure at the throat when positive voltage is applied to the red terminal, which is the exact opposite.

The B&C DE250 is a little louder than the PSD2002, so use 25Ω for R1 instead of 16Ω. The rest of the tweeter circuit remains the same. If you're using a Delta 10 midrange driver, then L2 is 0.5mH.


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