Hi all,
I am trying to set correctly a loudspeaker system with this combo: JBL 2426H +altec 511B (HF) and JBL 2234H 15inch woofer
the first problems I had where coming from the 2426h and 511horn combo, resonnating quite audibly 400Hz , 800Hz and 1.6Khz.... this was well solved using Wayne padham damping resistor method ...
For info I use bi amp and the active crossover is a DBX drpa driverack,
it allowed me to choose the Fc quite easily, that I set at 650hz...
and to damp a bit and equalize the horn I used a resistordivider 15Ohm parallel/25Ohm series and a bypass cap (0.47mf)
this giving an attenuation of about 10db with a 6db/octave rise after 3kHz
Sound is quite good, But now I'd like to really confirm that by easy measurements, and here comes my question, considering that I am not a "computer guy" would anyone know an easy way to measure impedance curve from the horn with simple equipment, like a voltmeter and of course Low frequency generator? like setting diffrent frequencies and taking it point to point to draw the curve...
I know there are softs for that but Really would take me a year to get how they work
any advice would be cool
Vince
I am trying to set correctly a loudspeaker system with this combo: JBL 2426H +altec 511B (HF) and JBL 2234H 15inch woofer
the first problems I had where coming from the 2426h and 511horn combo, resonnating quite audibly 400Hz , 800Hz and 1.6Khz.... this was well solved using Wayne padham damping resistor method ...
For info I use bi amp and the active crossover is a DBX drpa driverack,
it allowed me to choose the Fc quite easily, that I set at 650hz...
and to damp a bit and equalize the horn I used a resistordivider 15Ohm parallel/25Ohm series and a bypass cap (0.47mf)
this giving an attenuation of about 10db with a 6db/octave rise after 3kHz
Sound is quite good, But now I'd like to really confirm that by easy measurements, and here comes my question, considering that I am not a "computer guy" would anyone know an easy way to measure impedance curve from the horn with simple equipment, like a voltmeter and of course Low frequency generator? like setting diffrent frequencies and taking it point to point to draw the curve...
I know there are softs for that but Really would take me a year to get how they work
any advice would be cool
Vince
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Hi Vince, I love the speaker stands!
I think, rather than talking about measuring impedance, you mean frequency response. You can do this with a tone generator and a SPL meter as you said above. If you do mean impedance, then have a look at Rod Elliot's site for a manual method. However, I would encourage you to use the existing software packages that do the measurements for you. They may be slightly more expensive, and have a steeper learning curve, but once you are up and running then you will have a much faster, more powerful and flexible suite of tools to work with.
I think, rather than talking about measuring impedance, you mean frequency response. You can do this with a tone generator and a SPL meter as you said above. If you do mean impedance, then have a look at Rod Elliot's site for a manual method. However, I would encourage you to use the existing software packages that do the measurements for you. They may be slightly more expensive, and have a steeper learning curve, but once you are up and running then you will have a much faster, more powerful and flexible suite of tools to work with.
Thank you very much Pinkmouse!
sure the cabinets stands are audiophile approved
As your advise I'll look at Rod Elliots' method , thanks for the link!
yes I was meaning impedance curve...
I already took the response curve but the impedance could help me confirm everything is ok...
I will also try to follow your advises concerning softwares, but I really take time to get into it!
Thanks
Vince
sure the cabinets stands are audiophile approved
As your advise I'll look at Rod Elliots' method , thanks for the link!
yes I was meaning impedance curve...
I already took the response curve but the impedance could help me confirm everything is ok...
I will also try to follow your advises concerning softwares, but I really take time to get into it!
Thanks
Vince
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