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| Date: |
March 04, 2007 at 07:48:07 |
| From: |
andrewt, [host81-129-79-3.range81-129.btcentralplus.com] |
| Subject: |
Re: measuring trouble |
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Hi,
it looks like your amp cannot go low enough to test your driver.
What hope have you got of getting it to reproduce sub-bass if it has a high pass filter characteristic like you have described?
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.
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.
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Posted with TalkShop version
2.76 BETA |
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