• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Analog Signal Processor vs. Oscilloscope

Madjalapeno

Senior Member
Forum Donor
Joined
Aug 13, 2021
Messages
446
Likes
1,045
Location
NH, USA
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
 

Attachments

  • 1636749712022.png
    1636749712022.png
    37.1 KB · Views: 27
OP
Madjalapeno

Madjalapeno

Senior Member
Forum Donor
Joined
Aug 13, 2021
Messages
446
Likes
1,045
Location
NH, USA
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

Major Contributor
Joined
Oct 5, 2018
Messages
4,611
Likes
10,350
Location
Hampshire
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

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
39,148
Likes
174,995
Location
Seattle Area
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

Major Contributor
Joined
Oct 5, 2018
Messages
4,611
Likes
10,350
Location
Hampshire
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

Senior Member
Forum Donor
Joined
Aug 13, 2021
Messages
446
Likes
1,045
Location
NH, USA
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

Senior Member
Forum Donor
Joined
Aug 13, 2021
Messages
446
Likes
1,045
Location
NH, USA
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
 

Attachments

  • sq_w.png
    sq_w.png
    14.3 KB · Views: 37
Last edited:
OP
Madjalapeno

Madjalapeno

Senior Member
Forum Donor
Joined
Aug 13, 2021
Messages
446
Likes
1,045
Location
NH, USA
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
 
Top Bottom