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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, 01:45 PM   #1
realflow100 is offline realflow100  United States
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Default Adding tweeter to full range speaker super high ohm resistor needed?

I tested the speaker and tweeter with a variety of resistor values and it seems the speaker sounds the best with a 75 ohm (two 150ohm ones in parallel) resistor!

the tweeter doesnt overwhelm the speakers that way. but they sound decently balanced.

I compared the cheap 3 inch 3 ohm speaker + tweeter to my dayton audio MK402 speakers
and the treble sounds pretty good on both. only difference is lack of bass and the cheap speaker has a much warmer sound to it. (i ported the speaker in its box with a deeply tuned port to give it a more clean sound. less distortion at high volume levels. didnt want to completely seal the box since then it sounds muddy instead.

is it crazy that the tweeter needs such a high value resistor with it to make it sound balanced and not overwhelming the speaker?
the tweeter is directly above the speaker standing on the top of the box. just superglued then hot glued in place to keep it in a decent spot

its a really cheap speaker but sounds decent for use as a bluetooth speaker or speaker on the go.
it doesnt take much power to get loud either. even a 3W bluetooth chip amp can almost bottom it out. it has really soft suspension and surround. no coil rub all all the way to the maximum of its travel in both directions.
paper cone foam surround.
I might get another one to make it a set to have as spare or something.
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Old 15th March 2019, 01:54 PM   #2
Galu is offline Galu  Scotland
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It appears you are putting a 75 ohm resistor in series with your tweeter to lower its output to match that of the main speaker. This certainly seems a high value, indicating that the two drivers are vastly different in sensitivity.

If it sounds OK to you then stick with it - it can't do any harm!
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Old 15th March 2019, 01:59 PM   #3
realflow100 is offline realflow100  United States
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the tweeter is a 200W cheap super tweeter kind of thing. shaped like a small round cylinder with two small wires coming out the bottom side of it from the side of the cylinder wall

it had some fancy word on the packaging for the "type" of tweeter
without the resistor its all i can hear is just the tweeter. the speaker is only just audible lol

It sounds pretty good with the 75ohm resistor though combined with the cheap little 3-inch 3-ohm speaker. brings good sparkle/air to the speaker.
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Old 15th March 2019, 02:00 PM   #4
picowallspeaker is offline picowallspeaker  Italy
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Galu, you have omitted to pronounce the magic word "capacitor in series with the tweeter". With 75 Ω I bet the tweeter won't get harmed at full BW
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Old 15th March 2019, 02:05 PM   #5
realflow100 is offline realflow100  United States
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it has an internal 2.2uF or 3.3uF capacitor inside it. the packaging says it has a capacitor built in.
i'm not sure exactly what value it is. but probably around that range of 2.2uF to 3.3uF

it definitely sounds like it has a capacitor in series with it. otherwise i'd hear way more midrange from it with or without the resistor
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Old 15th March 2019, 02:17 PM   #6
realflow100 is offline realflow100  United States
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Compared to my dayton audio MK402's the speaker sounds more lively. the midrange seems closer to me.
and with the tweeter it sounds pretty nice.

I tested putting some eggcrate 1" foam panels in the box trying different amounts of it. but it didnt do much so I took them out

the box the speaker is in is quite large actually.
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Old 15th March 2019, 02:18 PM   #7
picowallspeaker is offline picowallspeaker  Italy
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So you can open it and put some 0.47-1 uF cap.
It reminds me some of those bullet tweeters with fairly high output ( but nothing acceptable over 15 kHz, probably less ).
A smaller cap might work same as a resistor...say 18 kHz is 10 dB down, you're on target
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Old 15th March 2019, 02:24 PM   #8
realflow100 is offline realflow100  United States
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i tried adding caps the first time. only had two 3.3uF ones. tried one. tried both in series.
but nope barely any difference. still massively too overpowering
so then I tried resistors instead and it sounded way better that way.
its glued together pretty tightly. dont think im gonna get into it without damaging something or ruining its sound quality forever in some way. so cant just open it up and swap out the capacitor

it sounds like everything is coming from one source. I can definitely tell the tweeter is working it makes a noticable difference when I enable/disable the tweeter or put my hand over it
but it still sounds like its all from one speaker

Last edited by realflow100; 15th March 2019 at 02:28 PM.
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Old 15th March 2019, 03:28 PM   #9
Galu is offline Galu  Scotland
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Could you give us more details (manufacturer/model) and perhaps a photo of this terrific tweeter?
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Old 15th March 2019, 03:35 PM   #10
realflow100 is offline realflow100  United States
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https://www.walmart.com/ip/Power-Aco...eeter/52626241
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