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Old 12th February 2004, 06:29 AM   #1
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Default Frequency Response program

I'd like to try and test the frequency response from a speaker I have, and I've tried looking for programs without a lot of luck. I have found some programs that work for sound cards, but I'm looking for one that will test a speaker. Maybe I'm not looking at the programs enough? I have downloaded a program called Right Mark, and I've heard you can use that to analyze speakers rather than a sound card, but I'm not sure how. Can anyone help me out? Thanks guys!
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Old 12th February 2004, 04:11 PM   #2
Ron E is offline Ron E  United States
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Speaker workshop

www.speakerworkshop.com
www.audua.com

You need to build a jig ($30-40) and build or buy a microphone and preamp.

You also need considerable patience, as the program is not well documented; but it has alll the features you need.
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Old 12th February 2004, 04:17 PM   #3
Sheldon is offline Sheldon  United States
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Hmm, interesting thought about using RightMark. I too downloaded it as suggested by Claudio Negro. I'm using Speaker Workshop for the frequency response measurements, but thinking about it, it seems you could use RightMark.

Right Mark just feeds the line out to its respective line in and compares the output with the imput. You would need to feed one channel line out to your amplifier and use a mic and mic preamp to the same channel line in. If you can get the levels close, don't see in principle why it wouldn't work, unless it somehow generates an error message based on out of bounds values. It wouldn't have all the analysis features of Speaker Workshop, but it could generate a response curve. Give it a try.

Sheldon
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Old 12th February 2004, 05:58 PM   #4
claudio is offline claudio  Italy
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Hi,
remember that RMAA gives ungated responses, thus speaker+room response.

Claudio
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Old 12th February 2004, 06:17 PM   #5
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Here's what I have so far: I have a laptop hooked up to a stereo receiver with a heaphone-to-RCA cable converter. Then I also have a microphone hooked up to the microphone-in jack on the laptop so I can monitor the speaker. Would this set up be right for what I want to do?

Is there anywhere I can go to find some sort of tutorial on how to do frequency response with one of these programs?
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Old 12th February 2004, 06:36 PM   #6
claudio is offline claudio  Italy
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Quote:
Is there anywhere I can go to find some sort of tutorial on how to do frequency response with one of these programs?
Check my site for a Speaker Workshop tutorial.

Regards

Claudio
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Old 13th February 2004, 01:04 AM   #7
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Quote:
Originally posted by JasonDelta
Here's what I have so far: I have a laptop hooked up to a stereo receiver with a heaphone-to-RCA cable converter. Then I also have a microphone hooked up to the microphone-in jack on the laptop so I can monitor the speaker. Would this set up be right for what I want to do?

Would advise against using mic input on soundcard - response of these usually not good, and since it is mono, you cannot use a reference signal. Best to use stereo line inputs on soundcard and mic preamp, however if laptop does not have line inputs (quite often the case), then be aware there may be errors in measurements.

Another analysing program you could try is SIA SmaartLive - this does real-time measurements. Demo version be be downloaded.

Cheers
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Old 13th February 2004, 04:50 AM   #8
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Perhaps I should further explain what I'm doing. I'm working on a physics experiment, and I'm trying to see what kind of frequency response I can get out of a simple speaker I made out of a plastic cup and magnet wire. I only know a little about all this sound analysis stuff, so I'm trying to figure it all out. I guess I'm just trying to find some simplistic program that will allow me to see the input vs. the output when I pump a specific frequency into the speaker. I can graph all the points later. I don't need anything really accurate though.
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Old 13th February 2004, 06:22 AM   #9
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For that application, the mic input will probably be ok. Speaker workshop will do all you need. Good luck with the experiment (I know some others bagged your idea in another thread).

Cheers
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Old 13th February 2004, 12:29 PM   #10
Ron E is offline Ron E  United States
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If all you want are reality check measurements of protoype speakers, you don't need a jig, and the mic input will probably be fine - although I always seem to get a lot of hum with mine.

Make sure you use an omnidirectional microphone for measurements. The typical computer microphones you buy in a blister pack are usually Unidirectional (also called cardoid), which have a frequency response that changes in the bass (under 200Hz or so) with the distance from the source.
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