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Stacking crossover components?
Stacking crossover components?
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Old 14th October 2021, 09:04 AM   #11
markbakk is offline markbakk  Netherlands
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Wirewound resistors can have serious inductive values, but the low-selfinductance types are so common, that hardly can be an issue. It even is quite good practice in amplifier output stages to wrap some wire for coil around a resistor to create a LP filter.
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Old 14th October 2021, 06:23 PM   #12
profiguy is offline profiguy  United States
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Quote:
Originally Posted by AllenB View Post
Do you think there might have been some mutual inductance happening there?
LP coil was 4-5 inches away from the tweeter HP coil and at a 90 degree angle. It was also set up for bi-wiring so the LP wasn't even used for testing.
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Old 14th October 2021, 06:37 PM   #13
profiguy is offline profiguy  United States
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Quote:
Originally Posted by markbakk View Post
Wirewound resistors can have serious inductive values, but the low-selfinductance types are so common, that hardly can be an issue. It even is quite good practice in amplifier output stages to wrap some wire for coil around a resistor to create a LP filter.
The end caps on WW resistors are usually steel along with the leads, which do have some mass to them and can act as an inductor core.

Amp output LR series circuits typically are packaged together for convenience purposes to be compact and close to the speaker terminals. They don't need to be that big mainly because the resistor doesn't really see any voltage drop when the amp is reproducing the typical music spectrum as the coil is so small in value. I learned that the hard way as a teenager when I first started working on audio equipment, trying to see how much power bandwidth the amp had at higher frequencies with a sine wave generator and load resistor - the resistor inside the coil started to smoke as I went past 25k or so.... oops!
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Old 14th October 2021, 08:19 PM   #14
AllenB is offline AllenB  Australia
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Stacking crossover components?
No, I meant the wirewound resistor with its turns could be linking into the flux created by the inductor etc..
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Old 14th October 2021, 10:29 PM   #15
profiguy is offline profiguy  United States
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Hmm... never thought of that. The resistor was only around 1 to 2 ohms, so I doubt it could have generated that strong of a field or vice versa pick up anything significant from the inductor.
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Old 14th October 2021, 11:08 PM   #16
xrk971 is offline xrk971  United States
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Stacking crossover components?
I put resistors on top of an air coil like that all the time (for a BSC shelf filter). No problems. Just make sure it doesn’t rattle.
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Old 14th October 2021, 11:08 PM   #17
AllenB is offline AllenB  Australia
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Stacking crossover components?
@ profiguy,
The resistance is irrelevant, the number of turns isn't.
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