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-   -   Measuring my speakers (http://www.diyaudio.com/forums/multi-way/219787-measuring-my-speakers.html)

lduarte1973 15th September 2012 06:06 PM

Measuring my speakers
 
1 Attachment(s)
my first mesurement with mic only , im still waiting for spl meter , what does this graph tell me ? from 10 khz up its flat and ill leave above 200hz ill deal with it later

puppet 15th September 2012 06:41 PM

By the look of the FR I'd say you were singing "Ol Danny Boy"

:P

lduarte1973 15th September 2012 06:54 PM

sorry i dont understand

puppet 15th September 2012 07:38 PM

... just a bad joke.

tvrgeek 16th September 2012 12:05 AM

What you have not told us is what the measurement conditions are. Is this far field? It is gated MLS type? Pink noise? Sweep? How far away is the mic? Is the mic calibrated?

Every combination of measurements tells us something different. What the above graph tells me is your sound card works. Without understanding what you are measuring and how, it tells me nothing else. Are the speakers ported or sealed? In line with the tweeter or woofer?

Wondering , why do you want an SPL meter? Not very useful for speaker design and tuning.

Melo theory 16th September 2012 01:39 AM

Quote:

Originally Posted by puppet (Post 3166229)
By the look of the FR I'd say you were singing "Ol Danny Boy"

:P

:D haha!

Melon Head 16th September 2012 01:47 AM

Do you have a crossover at 600Hz?
If so it looks like you might need to reverse the polarity of one of your drivers

lduarte1973 16th September 2012 12:05 PM

hi everybody , this mesurement is in my room , the mic is in my listening music position (sofa) .i will have my calibrated mic and calibrated spl meter this week , this was just my first mesurement , the mic is 2.5 meters away from the speakers 45 off axis

tvrgeek 16th September 2012 12:25 PM

You are measuring the room, not the speaker. Measure at about 300mm and at 1M and see what the changes are. You still did not tell us how this was made. Is it an MLS pulse ( go download ARTA ) or is this pink noise, or is it a sweep. Each method is useful for different things. Unless the speaker is on a 30 foot pole in the air, you are measuring the room.

To understand measuring, pick up a copy of Measuring Loudspeakers ( clever name eh? ) by Joe D-Apolitto.

If you are not doing health and safety inspections, I don't know what a calibrated SPL meter is good for. I have one. I think the only thing I used it for in the last 10 years was to show a local bar owner he was endangering his employees health by letting bands control their own volume. Never used it for speaker design.

lduarte1973 16th September 2012 12:45 PM

1 Attachment(s)
its a sweep with rew smoothed 1/6 octave , ecm8000 behringer mic , minidsp 4x10


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