I'm currently trying this:
it's free . All right ?
it's free . All right ?
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hello everyone .
i want to use the method described in the following two web pages to measure the small-thiele parameters of my speakers .
a non-inductive resistor is recommended but there are many types of resistors with this characteristic . can you recommend the right one ?.
bye thanks
i want to use the method described in the following two web pages to measure the small-thiele parameters of my speakers .
a non-inductive resistor is recommended but there are many types of resistors with this characteristic . can you recommend the right one ?.
bye thanks
Any resistor is fine really. REW's calibration process will compensate for the resistor and test lead inductance, so I'm not sure why the recommendation is for a "non-inductive" one. Besides, a standard low resistance wirewound 10W sand cast resistor has an inductance in the 0.001mH range, not very significant in the context of speakers and crossovers. My test jig uses a normal 5W sand cast 10 ohm resistor, and it's perfectly fine.
My jig is made for use with a power amp, as well as loopback for speaker measurements:
On the port measurement topic, of course "there is a way", multiple ways in fact. One would be to measure nearfield response of the woofer output, and port output. These two measurements can be combined for a total response similar to the software cabinet model. Alternatively, the speaker low frequency response can be obtained using a "mix in box" method. This method can provide a good detail of the total low frequency response output, but won't be able to separate the woofer output from the port output.
My jig is made for use with a power amp, as well as loopback for speaker measurements:
Dual Channel Measurement Jig - HTGuide Forum
Here's a schematic for a simple dual channel measurement jig, which can be used with ARTA, REW, or SoundEasy.
www.htguide.com
On the port measurement topic, of course "there is a way", multiple ways in fact. One would be to measure nearfield response of the woofer output, and port output. These two measurements can be combined for a total response similar to the software cabinet model. Alternatively, the speaker low frequency response can be obtained using a "mix in box" method. This method can provide a good detail of the total low frequency response output, but won't be able to separate the woofer output from the port output.
interesting your system.
going back to the link I posted, it seems that in reality on the REW page 3 measurement methods are proposed.
1) direct use of the audio card outputs with a 1KOhm resistor
2) use of a headphone amplifier with a 100 Ohm resistor
3) use of a power amplifier with a 33 Ohm resistor
but the image on the page only shows connection diagram number 1).
where are the other two connection diagrams?.
going back to the link I posted, it seems that in reality on the REW page 3 measurement methods are proposed.
1) direct use of the audio card outputs with a 1KOhm resistor
2) use of a headphone amplifier with a 100 Ohm resistor
3) use of a power amplifier with a 33 Ohm resistor
but the image on the page only shows connection diagram number 1).
where are the other two connection diagrams?.
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1 and 2 are the same, 3 I have provided for you, it is the same but with a voltage divider at the soundcard input to step down the signal to "line level".
REW it a tool, how you use it is up to you. All methods of connection that produce a signal at the soundcard input for analysis are possible. Impedance measurement is simply to create a voltage divider between the driver and a known constant resistance.
REW it a tool, how you use it is up to you. All methods of connection that produce a signal at the soundcard input for analysis are possible. Impedance measurement is simply to create a voltage divider between the driver and a known constant resistance.
what do you think about this tool ?.
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