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Multi-Way Conventional loudspeakers with crossovers

Adding tweeter to full range speaker super high ohm resistor needed?
Adding tweeter to full range speaker super high ohm resistor needed?
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Old 15th March 2019, 03:54 PM   #11
Galu is offline Galu  Scotland
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Thanks - 12dB high pass filter, but there's no mention of sensitivity in the link.

Specs of the similar NB-1 say 5kHz - 25kHz; 97dB SPL without further detail.
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Old 15th March 2019, 04:48 PM   #12
realflow100 is offline realflow100  United States
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I'm pretty sure its 97dB. just from how much the noise floor is audible with these tweeters without a resistor. i can hear the noise floor more than a foot away. maybe even 3 feet away if its aimed at my ear at ear level
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Old 15th March 2019, 06:04 PM   #13
picowallspeaker is offline picowallspeaker  Italy
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SO now it's time for a net, a divider, an L-pad !!
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Old 15th March 2019, 06:12 PM   #14
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by Galu View Post
This certainly seems a high value, indicating that the two drivers are vastly different in sensitivity.
Yes, probably the tweeters are 4 Ω and the "woofer" is 8 Ω.

About adding or not some capacitance
Quote:
i tried adding caps the first time. only had two 3.3uF ones. tried one. tried both in series.
I was saying of decreasing it. Scientifically: 0.47 uF.........1uF - Better to let the two cables out away from the tweeter, and to do the changes at the end of the cable
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Old 15th March 2019, 06:46 PM   #15
Michael Bean is offline Michael Bean  United States
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Did you try reversing the polarity on the tweeter?

Mike
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Old 15th March 2019, 06:53 PM   #16
realflow100 is offline realflow100  United States
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I wrote in my first post that the speaker is 3 ohms 3 watts and 3-inches across written on the back of the magnet and the tweeter is probably 4 ohms

the tweeter is just overpowering due to its high sensitivity and high output. it has a neo magnet
it sounds just fine with the 75ohm resistor going to it. no reason to change anything if it sounds good. gives just enough air to the speaker without being too overpowering.
its noticable but not overpowering.

reversing the polarity without the resistor makes it sound almost identical. just weird sounding
with the resistor and wired reversed. the tweeter is completely silent. cant hear it at all anymore. sounds like its unplugged
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Old 15th March 2019, 07:41 PM   #17
adason is offline adason  United States
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L-pad is the only correct way to go
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Old 15th March 2019, 08:14 PM   #18
realflow100 is offline realflow100  United States
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whats L-pad?
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Old 15th March 2019, 08:17 PM   #19
Galu is offline Galu  Scotland
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Read about L pads here:

Weber L-Pad Design
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Old 15th March 2019, 08:22 PM   #20
Galu is offline Galu  Scotland
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P.S. When using the calculator enter just one tenth of your amplifier power, as that's the maximum which will reach the tweeter via its 12db/octave high pass filter.

This calculator is a bit simpler to use than the Weber one.

LPad Driver Attenuation Circuit Designer Calculator

Last edited by Galu; 15th March 2019 at 08:25 PM. Reason: Added the alternative calculator
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