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Old 2nd November 2015, 06:44 PM   #1
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Default Crossover Modification

newbie here with a crossover question. I recently upgraded that caps in a klipsch kp3.6a crossover and noticed that the person who owned that speakers before me has removed that 3.3 ohm resistor in the tweeter circuit. I was wondering why he may have done that, and what the affect it would have on the way the speakers sound? thanks for any help
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Old 2nd November 2015, 07:11 PM   #2
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If you simply remove the 3R3 resistor in the tweeter path, the tweeter will mute. There should be at least a piece of wire instead of the resistor, and in this case the sound of the speaker will be brighter as the tweeter has at least a couple of dB more. I'd put the resistor again in the crossover, it should sound more natural.

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Old 2nd November 2015, 07:14 PM   #3
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thank you for the reply. Actually there is a wire in the i forgot to mention that . I will definitely put the resistor in and see what kind of difference it makes.
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Old 2nd November 2015, 07:36 PM   #4
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Remember to remove the wire.
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Old 2nd November 2015, 08:57 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

Your bordering on totally insulting intelligence in two posts.

rgds, sreten.
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Old 2nd November 2015, 09:37 PM   #6
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Quote:
Originally Posted by ndirish147 View Post
newbie here with a crossover question. I recently upgraded that caps in a klipsch kp3.6a crossover and noticed that the person who owned that speakers before me has removed that 3.3 ohm resistor in the tweeter circuit. I was wondering why he may have done that, and what the affect it would have on the way the speakers sound? thanks for any help
I am not familiar with the Klipsch KP3.6a. But: The parallel inductor in the tweeter path is specified as 100 uH, i.e. 0.1 mH. Together with the capacitors (3 uF and 2 uF) I'd estimate a cut-off frequency in the 10 kHz range. Human ears are not very sensitive up there, so I don't expect inserting the 3.3 Ohm resistor (and removing the wire...) will do much to what you hear.

Just give it a try and see what you like.
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Old 3rd November 2015, 12:54 AM   #7
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

Your bordering on totally insulting intelligence in two posts.

rgds, sreten.
Had to giggle at that, maybe just me!

Anyway...back on-topic, removing that 3.3R looks very bad for impedance to me. Evidently it brightens up the tweeter, but 2.5 ohms reactive can't be good for the amplifier. It is 5 ohms with the resistor if those component mbrennwa values are right and it is a 6 ohm dc tweeter..
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Old 3rd November 2015, 03:27 AM   #8
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I wasn't insulted... 😊 happy to have people willing to help me out!! It looks like my best move will be to find some suitable resistors to protect my amplifier.
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Old 3rd November 2015, 08:12 PM   #9
keilau is offline keilau  United States
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Quote:
Originally Posted by system7 View Post
Had to giggle at that, maybe just me!
Me too!

Quote:
Anyway...back on-topic, removing that 3.3R looks very bad for impedance to me. Evidently it brightens up the tweeter, but 2.5 ohms reactive can't be good for the amplifier. It is 5 ohms with the resistor if those component mbrennwa values are right and it is a 6 ohm dc tweeter..
There seem to be a RXE075 variable resistor in parallel with a 100 Ohms resistor after the HP and before the tweeter.

Without knowing the specific impedance and phase character of the tweeter and the RXE075, it is hard to comment. The 3.3 Ohm may be there to tame potential spike at the crossover region.

mbrennwa may be right about where the tweeter range is.
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Old 4th November 2015, 01:55 AM   #10
system7 is offline system7  United Kingdom
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I was scratching my head over that 100 ohm in parallel with an RXE. Perhaps it's a lightbulb? But no idea really.

But generally an underdamped load on a crossover is VERY BAD for impedance. It's like when the tweeter blows and goes high impedance and the highly reactive crossover takes the amplifier out shortly after. This is what happens at parties!
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