Public domain downloadable file for burn-in and testing?
 

Arnold wrote:

Don Pearce wrote:
What in blue blazes are you on about? Amplifiers don't burn in - they
start as good as they get, then very, very slowly fail, and if you
really want to play something on it for ages, play anything and just
press the repeat button.

I am considering always leaving the amp on.

Do you also drive a 7 litre V8 SUV ?


That way it is always warm
to play straight away and none of that terrible thermal cycling - being
switched on and off.

Thermal cycling from on-off-on switching is a total non-event. Except in the
minds of the easily-led. Leaving kit on all the time will certainly result in a
reduced lifetime though.


I will get a decent lightning protector for those
nasty lightning bolts!

You can't 'protect' yourself from lightning without at least several thoudsand
pounds worth of industrial grade kit.


You can't do anything with speakers using tones - all you will assess
is the depth of standing wave modes in you room. And believe me, if
you don't live in a really good anechoic chamber, they will be huge.

I just want to hear how balanced the tweeters are.

What do you mean by balanced ?

Graham

Public domain downloadable file for burn-in and testing?
 

Don Pearce wrote:

On Mon, 11 Sep 2006 17:30:51 +0200, Arnold wrote:

Don Pearce wrote:
What in blue blazes are you on about? Amplifiers don't burn in - they
start as good as they get, then very, very slowly fail, and if you
really want to play something on it for ages, play anything and just
press the repeat button.

I am considering always leaving the amp on. That way it is always warm
to play straight away and none of that terrible thermal cycling - being
switched on and off. I will get a decent lightning protector for those
nasty lightning bolts!

Thermal cycling is simply not an issue. I have amps that are many,
many years old, and they have never failed through thermal cycling. Do
global warming a favour, and turn off everything you aren't using.

As for trouble from lightning bolts, if you join the end of the
lightning conductor on your house to ground instead of the Hi Fi, you
will have no trouble.


You can't do anything with speakers using tones - all you will assess
is the depth of standing wave modes in you room. And believe me, if
you don't live in a really good anechoic chamber, they will be huge.

I just want to hear how balanced the tweeters are.

Not the slightest chance of doing it that way. Why do you suspect they
may be unbalanced? Play something in mono, something with plenty of
top end to it, and position the speakers equidistant from you, with
the tweeters facing you. Does the sound appear to come from a point
midway between the speakers? Yes? They are balanced. If not, nudge the
balance control slightly to put the image in the middle, then leave it
there. You won't need to do this, though - they will be just fine.

Any lack of this kind of balance will almost invariably be due to room acoustics
anyway.

Graham

Public domain downloadable file for burn-in and testing?
 

Arny Krueger wrote:

"Arnold" wrote in message

I want to get hold of a free burn-in CD for my new amp. Does anyone know
of a public domain download that can be
copied to CD and played?
I am also looking for a similar download file with tones
of different pitch but the same volume to compare left
and right speakers.
Yes, I could buy something over the web from the
Audiophile / Stereophile website but I want it today
still.

Note: business opportunity for those who ply the snake oil trade.

I so, so see a mega opportunity here !

Graham

Public domain downloadable file for burn-in and testing?
 

Keith G wrote:

"Don Pearce" wrote
On Mon, 11 Sep 2006 14:22:36 +0100, "Keith G"
wrote:
"Don Pearce" wrote
On Mon, 11 Sep 2006 13:12:21 +0100, "Keith G"
wrote:
"Don Pearce" wrote
On Mon, 11 Sep 2006 13:07:06 +0200, Arnold wrote:

I want to get hold of a free burn-in CD for my new amp. Does anyone
know of a public domain download that can be copied to CD and played?

What in blue blazes are you on about? Amplifiers don't burn in - they
start as good as they get,

Nope, I'd disagree with that - especially in the case of valves.

Don't think we're talking about valves here.

Even in the case of SS amps it seems commonplace to advise 20/30 minutes
warm-up time before *serious* use...???

(Doesn't affect me and I don't worry about it myself.....??)


Warm-up is a very different beast to burn-in.

Yes, I suppose it is....

Allowing say 20 mins for the operating points to stabilise is indeed quite
different to 'burn-in'.

The only things affected by long term power on would be in the 'burn-out'
category !

Graham

Public domain downloadable file for burn-in and testing?
 

Arnold wrote:

Don Pearce wrote:

As for trouble from lightning bolts, if you join the end of the
lightning conductor on your house to ground instead of the Hi Fi, you
will have no trouble.

Where I stay, lightning storms destroy fax machines, TV's, hifi
components, microwaves - you name it!

So ?

Graham

Public domain downloadable file for burn-in and testing?
 

Arny Krueger wrote:

"Arnold" wrote in message


I think this one pair of speakers of mine had a tweeter
fried long ago and I want to check if I can hear a
difference between the original one in the one speaker
and the replacement in the other.

Why not just use some regular music CD with good highs recorded on it that
you are familiar with?

Using familiar music is *unbeatable*.

Back in my regular SR / PA engineering days I used my own short 'reference
compilation' to EQ the rig.

Far, far better than any silly RTA nonsence.

Graham

Public domain downloadable file for burn-in and testing?
 

In article , Arnold
wrote:
Don Pearce wrote:
What in blue blazes are you on about? Amplifiers don't burn in - they
start as good as they get, then very, very slowly fail, and if you
really want to play something on it for ages, play anything and just
press the repeat button.

I am considering always leaving the amp on. That way it is always warm
to play straight away and none of that terrible thermal cycling - being
switched on and off.

Unless it is a class-A amp you only use at tiny volume levels there will
probably be far more 'thermal cycling' as the music plays than when you
turn it on to idle. Thus if you are worried that the amp can't handle being
thermally cycled, I'd recommend you don't use it and get a replacement.
:-)

The good news is that if it is a decent design, it won't have any problems
with 'thermal cycling'.

You can't do anything with speakers using tones - all you will assess
is the depth of standing wave modes in you room. And believe me, if
you don't live in a really good anechoic chamber, they will be huge.

I just want to hear how balanced the tweeters are.

Use an FM tuner, tuned off any stations, and listen to the hiss with
the 'mono' button selected.

Note, though, that unless your listening room, etc, are particularly
symmetric, the results may not be a central 'hiss' even if the tweeters
are identical. Note also how much the sound changes as you move your
head. :-)

Slainte,

Jim

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