Speaker overload (tweeter) protection using bulbs (repost)

[Eeyore]

I got to say Jamie compared to you Eyesore is a Rhodes scholar, I havn't
seen anything but pure rubbish from you

and before you go off again like the noon bell at 11:17
there isno love lost between eyesore and myself
George

Thank you for the endorsement George. I recall we got on fine when I first
joined this group. For fear of provoking any further discord I'll avoid
mentioning the name of a certain person who helped upset that.

I was serious about you asking Jim Savery about the solder used by Behringer
for N.A. destined products btw. If you're too busy, could you remind me of his
contact details, email whatever and I'll enquire myself ?

Graham

 

[Eeyore]

Sigh. Find a basic DC coupled design and drive it *very* hard - we're
talking severe overload here - and look at the output. It will approach
the power rails.

It'll be virtually a square wave with almost twice the sinewave power of the
amp but not 'DC' though.

Graham

 

[Eeyore]

That's what saturated output devices do.

Depends what you call saturate. It'll clip even if anti-saturation measures such
as a Baker Clamp are used.

Right, there will be a sort of sloppy square wave whose spectral content
will depend on the waveform driving the amplifier.

Yeah. Might conceivably be a bit asymettrical but probably not to a large
degree.

The peak amplitude will be the rail voltages (which will have sagged if
there is a significant load), minus the saturation voltage of the output
devices. If you look closely, there may be some funny stuff where the
output stages snap out of saturation.

Base charge storage. That's what the Baker Clamp stops.

This square wave will of course have more energy in it than a sine wave with
a similar peak amplitude.

Around twice.

Graham

 

[liquidator]

See! this is what happens when you crosspost - you get the idiots from
other groups polluting all the groups.

Can I get an Amen?

Been bitching at Graham to stop this shit for probably a year.

 

[liquidator]

Still saw enough of them in amp racks. Usually with a pair of Boxer fans
blowing on the heatsinks.

Most I ever counted was a festival system, 72 Phase 400's in racks. Not mine
of course, we had two systems, both together were less than half that.

I think we owned about 36, generally 6 on the bench, 6 as spares, 24 in
actual use.

But they were cheaper, lighter, and sounded better than Crowns.

 

[liquidator]

I`m getting a terrible sense of DejaVu about this thread

Yeah, it's been hashed a dozen times, clipping ain't DC, and people with
high levels of knowledge don't say it is.

Just salesmen and and fader jocks. Not real engineers.

In practice, the severely clipped amp won't do a perfect square wave, it
will sag. so the "virtual DC" argument falls flat on it's face...most supply
rails do not have enough storage to sustain a full square wave...some of the
real heavy old iron may.

But I don't talk about old amps to make a point, nobody uses them any more.

 

[liquidator]

Depends what you call saturate. It'll clip even if anti-saturation measures such
as a Baker Clamp are used.



Yeah. Might conceivably be a bit asymettrical but probably not to a large
degree.



Base charge storage. That's what the Baker Clamp stops.



Around twice.

Arny and I agree?

Chicken Little was right...

I argue how close it is to virtual DC though.

I certainly don't feel it fits the definition.

 

[liquidator]

Thank you for the endorsement George. I recall we got on fine when I first
joined this group. For fear of provoking any further discord I'll avoid
mentioning the name of a certain person who helped upset that.

I was serious about you asking Jim Savery about the solder used by Behringer
for N.A. destined products btw. If you're too busy, could you remind me of his
contact details, email whatever and I'll enquire myself ?

Hey, you and I still have our words...but wouldn't it be friggin' boring if
everybody in th world agree on vanilla ice cream?

But different folks can find common ground. I got no quarrel with guys who
prefer blondes for instance...leaves more redheads for me...

 

[liquidator]

My irony meter just vaporized.

Used to be a stock scene in old Science fiction movies...all the meters go
into overload...someone yells out "Turn back you fool!"

Then the Earth explodes/a dimensional gate opens/a guy is mutated into a
nasty creature...(insert other options here).

 

[Eeyore]

**** off you bloated bag of gas.

Did you understand that?

I'm sure he understood it but King George won't like it one bit. He's a wee bit
temperamental, you know.

He also claims that MDF cabinets are crap despite buying them himself for his 'B
rigs'.

Graham

 

[Eeyore]

My irony meter just vaporized.

They should get engaged. ;~)

Graham

 

[Eeyore]

I'll give you one credit however, you
rec.audio.tech/alt.audio.pro.live-sound fuckheads breath a little
life into s.e.r.

It's been an interesting combination and as I've said, completely on topic for
all. It's given me a chuckle too to see what the techs think of what Assilon
calls 'fader jockeys'. And then there's Jamie. He's in his own league.

Graham

 

[Eeyore]

wish we could say the same for the s.e.r merkins
George

Do you fix your own gear Your Highness ?

Graham

 

[Eeyore]

Been bitching at Graham to stop this shit for probably a year.

I ONLY crosspost when it's on topic for all the groups as per netiquette
standards. Which it clearly was here.

In fact I normally trim groups more than anything, except you don't see that
of course.

Graham

 

[Eeyore]

Most I ever counted was a festival system, 72 Phase 400's in racks. Not mine
of course, we had two systems, both together were less than half that.

I think we owned about 36, generally 6 on the bench, 6 as spares, 24 in
actual use.

But they were cheaper, lighter, and sounded better than Crowns.

Crowns of that era always sounded gritty to me and had no better heatsinks
either. Never bothered with them then or since. Well especially as I 'roll my
own' these days !

Several UK companies like RSD/Studiomaster and Turner realised the heatsinking
problem and dealt with it. We had a Turner in my rig for a while. Sounded fine
too. It was driving mids (Philishave lookalikes - home made).

Graham

 

[Eeyore]

But I don't talk about old amps to make a point, nobody uses them any more.

Can't afford the fuel to carry them !

Graham

 

[Eeyore]

"Eeyore" wrote

Arny and I agree?

Chicken Little was right...

I argue how close it is to virtual DC though.

I certainly don't feel it fits the definition.

It's AC not DC ! Damn, they were on the week before last. 8 Nov.
http://thehorn.co.uk/ click on "What's On" then full listings. Not bad either.
Oh and I could tell you a tale about that evening too ....!

Graham

 

[Eeyore]

"Eeyore" wrote

Hey, you and I still have our words...but wouldn't it be friggin' boring if
everybody in th world agree on vanilla ice cream?

Totally agree. Had a chat about that on Sat in fact.

But different folks can find common ground. I got no quarrel with guys who
prefer blondes for instance...leaves more redheads for me...

Don't you DARE get near MY redheads ! Actually haven't seen many in ages but I
can spot them at a fair distance.

Anna was so stunning that - this has never happened before to me or since - my
legs would physically go weak.

I gave her a life home once (with her almost as perfect redhead friend Fiona).
As she left, she gave me a kiss on the neck that felt like sucking and blowing
at the same time. How DO they do it ?

Graham

 

[Eeyore]

Used to be a stock scene in old Science fiction movies...all the meters go
into overload...someone yells out "Turn back you fool!"

Then the Earth explodes/a dimensional gate opens/a guy is mutated into a
nasty creature...(insert other options here).

I caught the tail end of Alien vs Predator the other night. Boring really.

But then there's 'The Forbidden Planet'. It can still make my flesh tingle.

Graham

 

[Eeyore]

Interesting page:

http://home.mira.net/~gnb/audio/lme49810.html

Well fancy that ! Nat Semi do make some of the best integrated audio amps.
See Gainclone for example. Although this is only a driver.

Graham