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Old 3rd February 2003, 04:17 PM   #21
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Default Re: Re: Re: Re: Listening tests

Quote:
Originally posted by SY
[B]

That doesn't even vaguely make sense.

[B]
And that's quite another point. It may not make sense for you, but it makes sense for me. That's probably why our listening tests are different.
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Old 3rd February 2003, 08:11 PM   #22
jcarr is offline jcarr  United States
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As much as possible, you should make up multiple units (at the very least two), modify only one aspect at a time, and compare the modified unit against the unmodified unit. Having only one unit and modifying it can be misleading, because you really want to test the before-and-after-modified circuits under as similar conditions as you can possibly manage, and that includes your own physical and mental state.

The test audio system should also be set up as carefully as possible to make sure that the results are not masked by controllable causes such as excessive ground currents or improper speaker setup.

I have outlined my testing methodology previously in posts such as the following:

http://www.diyaudio.com/forums/showt...0831#post60831

http://www.diyaudio.com/forums/showt...2284#post62284

http://www.diyaudio.com/forums/showt...7797#post97797

http://www.diyaudio.com/forums/showt...7888#post97888

These are the same types of listening test methodologies that are conducted at the big Japanese electronics manufacturers like Technics (Panasonic/Matsushita) and Pioneer, although the test prototypes made by these companies are likely to incorporate special fixtures and structures that allow the circuits and components within each test unit to be swapped out quickly and easily.

regards, jonathan carr
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Old 3rd February 2003, 11:20 PM   #23
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Default Real Time A/B Testing.

On the front panel of my solder station I have fitted a switch so that I can selectively ground connect or isolate the tip/barrel of my soldering iron.
The switch in the isolated position allows me to solder in or isolate components anywhere in the whole system, and do real time A/B comparisons on the fly.
This method is very revealling of even tiny changes in the system sonics, and one does not need the same reliance on sonics memories.
This method allows practice in discerning minor changes, and once learned this greater hearing accuity is also usefull in standard A/shutdown/B testing.
Just like learning to ride a bicycle, you don't forget.

Eric.
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Old 3rd February 2003, 11:24 PM   #24
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Default ON THE FLY.

Hi,

Quote:
On the front panel of my solder station I have fitted a switch so that I can selectively ground connect or isolate the tip/barrel of my soldering iron.
I'm seriously disappointed...a spring is what I would have expected here...

Buon giorno,Eric San,
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Old 3rd February 2003, 11:32 PM   #25
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Default I'll Ask Again......

Have any of you blockheads tried the spring thing yet ?.
An A/B comparisonof spikes or springs ?.

Eric.

Frank, I know you are just being cheeky, and that is ok by me.
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Old 3rd February 2003, 11:36 PM   #26
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Default ON A SILVER PLATTER.

Hi Eric,

I was just creating an opportunity for you to put the question:

Quote:
Have any of you blockheads tried the spring thing yet ?.
Wasn't I?

Cheers,
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Old 3rd February 2003, 11:39 PM   #27
Bobken is offline Bobken  United Kingdom
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Funny you should mention that Eric, as I do precisely the same trick with my setup.

I have a 20 yr old Antex iron which was made with a ceramic 'inner' shaft, so the tip is electrically isolated from the rest.

In fact it worries me that when the element finally gives out, I doubt that I will be able to replace it as I haven't seen anything like that in catalogues for years.

They probably don't satisfy the recent safety standards, or something.

Also my power amps and (remote) speaker X'overs are always 'open', I just cover them over with an upturned carpet-covered box, and the lids of all my other gear haven't seen any fixing screws for years.
Not recommended, perhaps, if you have kids or pets around, but I don't have that problem!

Hardly a few days go by without my changing something around, as it is so easy to do it like this.

Regards,
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Old 3rd February 2003, 11:47 PM   #28
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Default SPRINGS.

Hi,

Q:What do kangaroos and springs have in common?

A:They jump all over the place.


Cheeeers,
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Old 3rd February 2003, 11:53 PM   #29
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Default And You Thought Kangaroos Are Stupid

Kangaroos are also the most efficient animal regarding locomotion.
This is reliant on their leg tendons storing and returning energy, thus making them the animal able to travel with the least expendature of energy, and able to cover large distances at high speed.

Eric.

Anyway, have any of you blockheads tried springs under your speakers or electronics ?.
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Old 3rd February 2003, 11:56 PM   #30
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Default KANGAROOS.

Hi,

ROTFLMAO...

Quote:
Anyway, have any of you blockheads tried springs under your speakers or electronics ?.

Hell no,...they al use kangies.
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