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Analog Signal Processor vs. Oscilloscope

Madjalapeno

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I'm in the process of building some Linkwitz LX521 speakers, which require a signal processor for cross over purposes. I decided to go with an Analog version for now.

As a final sanity check I thought I would look at the signals with a 2 channel oscilloscope, and wanted to share as I thought it was interesting.

I have one channel hooked up to the output of a Topping E30, and the other to the output of the ASP and am playing random music via Roon.

Woofer

woof.png


Lower Mid-range

lm2.png


Upper Mid-range

um.png


Tweeter

t1.png


I also set the sampling rate to be faster, as the tweeter doesn't show much

Woofer - Fast

wf.png


Lower Mid - Fast

lmf.png


Upper Mid - Fast

umf.png


Tweeter - Fast

tf.png
 

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OP
Madjalapeno

Madjalapeno

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Repeated with pink noise

pink noise - woofer

pn_w.png


pink noise - lower mid

pn_lm.png


pink noise - upper mid

pn_um.png


pink noise - tweeter

pn_t.png
 

mansr

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Will see if I can find a signal generator - it's not likely to damage anything is it?
Use a DAC. Whatever you used to create the pink noise can probably do a square wave too. No, it won't break anything.
 

amirm

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Will see if I can find a signal generator - it's not likely to damage anything is it?
The signal generator will likely not be able to drive a speaker by itself. You need to feed it to an amplifier. And yes, be careful with square wave, white noise, etc. as they can damage your speaker and/or your ears at high levels.
 

mansr

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The signal generator will likely not be able to drive a speaker by itself. You need to feed it to an amplifier. And yes, be careful with square wave, white noise, etc. as they can damage your speaker and/or your ears at high levels.
I had the impression the OP was measuring a crossover filter without speakers connected. If speakers are connected, too much HF energy can of course do damage.
 
Last edited:
OP
Madjalapeno

Madjalapeno

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You need to feed it to an amplifier. And yes, be careful with square wave, white noise, etc. as they can damage your speaker and/or your ears at high levels.
It's not going anywhere near my amps or speakers. This is purely a bench top exercise. Thought it was interesting to see how a cross-over/ASP works.
 
OP
Madjalapeno

Madjalapeno

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Playing via Audacity this time for slightly better control.

Square wave at 440Hz. Yellow is output from Topping E30, Purple is output from ASP.

Woofer

sq_lm.png


Lower Mid

sq_um.png

Upper Mid

sq_t.png

Tweeter

sq_t.png
 

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Last edited:
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Madjalapeno

Madjalapeno

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some more audacity playing

Pluck (midi pitch 60, fade out abrupt)

Woofer

pl_w.png


LM

pl_lm.png


UM

pl_um.png


T

pl_t.png
 
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