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| Date: |
March 05, 2007 at 13:47:48 |
| From: |
wim, [91.86.113.54] |
| Subject: |
Re: measuring trouble |
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Hi,
it looks like your amp cannot go low enough to test your driver.
- Yeah, i was afraid of that
What hope have you got of getting it to reproduce sub-bass if it has a high pass filter characteristic like you have described?
- so you insinuating that i should get another amp ? I am thinking about it too.
The test must be carried out with a source voltage that does not vary with frequency.
It is possible to correct for falling voltage when using the constant current method. It is operationally quite complex.
I do not know if the same correction can be used with the constant voltage method you have chosen to use.
How are you measuring driver current? That difficulty is what pushed me to the decision to adopt the constant current method.
- i did the test i found on the measuring page i found on this site. It uses a resistor to calculate the current from the voltage over the resistor.
BTW,
in my opinion the amplifier should have a -3db response down to about 1/10 of the frequencies you require to be reproduced accurately. i.e. below about 2Hz. If your system requires a high pass filter then you should add the precise high pass filter, that has been designed for your system, to that wideband amplifier. Starting with a compromised amplifier with am integrated high pass filter just about guarantees the wrong characteristic for the eventual sound output.
- I'm looking at an DIY amplifier kit that im considering for this speaker.
http://www.velleman.be/be/en/product/view/?id=9193
Anyone have any experience with it ? is it worth it or is it a waste of time ?
Btw thanks for the info! :)
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Posted with TalkShop version
2.76 BETA |
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