supertweeter problem - Page 2

planet10 · 15th March 2009, 09:03 AM

Quote:

Originally posted by paulfk
thanks dave, so a difference in output should be noticed when rotating the L pad.

That is its whole purpose

dave

paulfk · 15th March 2009, 09:21 AM

Quote:

Originally posted by planet10

That is its whole purpose

dave

and if there is no audible difference?

planet10 · 15th March 2009, 09:28 AM

Quote:

Originally posted by paulfk

and if there is no audible difference?

You mean difference in level? Then the L-Pad is broken or wired incorrectly (assumming the tweeter is fine -- you can just hook up the tweeter & the cap to test that)

dave

Cal Weldon · 15th March 2009, 03:31 PM

What Dave said.

paulfk · 15th March 2009, 05:47 PM

ok, have measured resistance at the binding posts and there is nil. So have dismantled tweeter, removed driver checked resistance 7.2 Ohms, tested L pad between terminals 2 and 3 and got a maximum of 8 Ohms down to zero when adjusting on spindle. Between 1 and 3 I get 7.8 Ohms up to 42 Ohms. Between 1 and 2 I get 7.8 Ohms - 42 Ohms. Can someone advise me on the correct wiring.

planet10 · 15th March 2009, 06:02 PM

.

paulfk · 15th March 2009, 06:12 PM

Quote:

Originally posted by planet10
.

thanks, that looks like the wiring on the fostex website, however the L pad I have is a monacor AT-62H and shows it as pos from amp - 3, 2 - + on driver, neg on driver to 1 and neg from amp, the opposite of the fostex wiring. I take it the cap goes on the positive side

Cal Weldon · 15th March 2009, 07:38 PM

Cap won't matter, it's an AC circuit.

paulfk · 15th March 2009, 07:55 PM

after checking the resistance between 1 and 2, 2 and 3, 1 and 3, it made sense to follow the daves wiring, which is the same as fostex. wired up one cap and attenuator outside the cabinet and tried it out, can now adjust the volume. Wired both supertweeters in the cabs and now waiting for glue to set. Had to glue the attenuator as the spindle will not protrude through the ball shaped cabinet.

15th March 2009, 03:31 PM	#14
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	What Dave said. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

15th March 2009, 07:38 PM	#18
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Cap won't matter, it's an AC circuit. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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15th March 2009, 05:47 PM	#15
paulfk diyAudio Member Join Date: Oct 2008	ok, have measured resistance at the binding posts and there is nil. So have dismantled tweeter, removed driver checked resistance 7.2 Ohms, tested L pad between terminals 2 and 3 and got a maximum of 8 Ohms down to zero when adjusting on spindle. Between 1 and 3 I get 7.8 Ohms up to 42 Ohms. Between 1 and 2 I get 7.8 Ohms - 42 Ohms. Can someone advise me on the correct wiring.

15th March 2009, 07:55 PM	#19
paulfk diyAudio Member Join Date: Oct 2008	after checking the resistance between 1 and 2, 2 and 3, 1 and 3, it made sense to follow the daves wiring, which is the same as fostex. wired up one cap and attenuator outside the cabinet and tried it out, can now adjust the volume. Wired both supertweeters in the cabs and now waiting for glue to set. Had to glue the attenuator as the spindle will not protrude through the ball shaped cabinet.