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Old 16th April 2012, 09:11 AM   #1
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Default Voltage divider?

Hi Guys,

I want to record the output of my amplifier to show that all amplifiers DON'T sound the same (It's an argument on a another forum).

I have a 60watt per channel Onix OA21 integrated amp. It's modified with some huge polypropylene caps taped to the top of the case (they won't fit in the box). If I change the Ansar polys to Mundorf, I can notice quite a large difference in sound quality and would like to record the difference.

I have a laptop (or PC) with Audacity for recording and an M-audio Mobilepre USB.

Would it be possible to build a voltage divider, so I can take the speaker outputs of my amplifier into my PC or Mobilepre (I asssume it would be better through the mobilepre)?

What do you think Guys?
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Old 16th April 2012, 10:52 AM   #2
AndrewT is online now AndrewT  Scotland
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Try to find the halfler and baxandall amplifier comparison papers.
I think there are many others.

All do a subtraction of some sort to leave the "error" as an output.
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Old 16th April 2012, 11:04 AM   #3
Mooly is offline Mooly  United Kingdom
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The amplifiers must be driving the speakers as a load too.

It's an interesting idea. My first thoughts are that you won't see (or be able to record) anything different tbh.

Perhaps prove the recording theory with two totally different amps or using one channel loaded and then unloaded.
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Old 16th April 2012, 11:18 AM   #4
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Well, to be exact, they are saying that all low distortion, competently designed amplifiers sound the same. They do exept that SS and valve designs can sound different.

I'd rather prove them wrong with recordings, rather than papers.
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Old 16th April 2012, 11:21 AM   #5
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Quote:
Originally Posted by Mooly View Post
It's an interesting idea. My first thoughts are that you won't see (or be able to record) anything different tbh.
If I can hear a difference why wouldn't I be able to record it?
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Old 16th April 2012, 11:24 AM   #6
AndrewT is online now AndrewT  Scotland
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Search out and read the comparison papers.

I think it was Cordell that said something along the lines of
" all amplifiers sound the same when properly designed to pass the signal".

"it's when they are asked to misbehave that they sound different".

When you find his actual quote, I expect it reads a lot different, but I think I have implied a roughly similar message.
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Old 16th April 2012, 11:39 AM   #7
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Quote:
Originally Posted by AndrewT View Post

I think it was Cordell that said something along the lines of
" all amplifiers sound the same when properly designed to pass the signal".

"it's when they are asked to misbehave that they sound different".

When you find his actual quote, I expect it reads a lot different, but I think I have implied a roughly similar message.
How would that help my argument?
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Old 16th April 2012, 11:51 AM   #8
sreten is offline sreten  United Kingdom
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Hi,

The answer to your question is yes, you can build a simple voltage divider,
as I assume your amplifier doesn't have floating negative terminals.

1K and ~ 47R would do it, the latter R depending on listening levels.

rgds, sreten.
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Old 16th April 2012, 11:52 AM   #9
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The amplifiers must be driving the speakers as a load too.
Didn't think of that. It wouldn't be to difficult to take the signal from the back of the speakers though.
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Old 16th April 2012, 11:53 AM   #10
AndrewT is online now AndrewT  Scotland
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The comparison method and jig enables one to listen to and to measure the "difference".

That is what you are trying to achieve.

You want to show that the amplifiers can sound different.
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