Is there a circuit that can be built to protect speakers from being blown
given the amps output power (rms) and the speakers max power?

it would be possible to use a fuse to protect the speaker.



"Johan Wagener" wrote in message
...
Is there a circuit that can be built to protect speakers from being blown
given the amps output power (rms) and the speakers max power?

could you give more detail please?

Johan Wagener wrote:
could you give more detail please?



Put a fuse between the amplifier and speaker. The size can be estimated
by using the formula P = I^2 * Z. It would have some meaning as long as
the power ratings you're working with reflect the real world.

In article ,
Mark Zarella wrote:

Johan Wagener wrote:
could you give more detail please?



Put a fuse between the amplifier and speaker. The size can be estimated
by using the formula P = I^2 * Z. It would have some meaning as long as
the power ratings you're working with reflect the real world.


heh.. that was going to be my question. how would you figure out the
correct fuse size.

i've seen fuses in some pa/studio enclosures.. hell i think parts
express has the panels with em built in.

but all of this when you can just turn it down, i don't get it.

--
cyrus

*coughcasaucedoprodigynetcough*

Turning down the volume when you have audible distortion is the best way to
not blow a speaker.

But keep in mind that way more speakers are blown with too little power than
with too much power. In fact I'd say it's rare to blow a subwoofer with too
much power. Most folks just get el crapo amps and drive them into clipping
therefore sending the speaker a sqaure wave and that will pop a voice coil
in a heartbeat.


"Johan Wagener" wrote in message
...
Is there a circuit that can be built to protect speakers from being blown
given the amps output power (rms) and the speakers max power?

In article .net,
"Pug Fugley" wrote:

Turning down the volume when you have audible distortion is the best way to
not blow a speaker.


i concur.

But keep in mind that way more speakers are blown with too little power than
with too much power. In fact I'd say it's rare to blow a subwoofer with too
much power. Most folks just get el crapo amps and drive them into clipping
therefore sending the speaker a sqaure wave and that will pop a voice coil
in a heartbeat.




hehe here we go again..

for about a week i had an old zapco 25x2 amp running full range (no
x-over) on a cheap aw1200 audiobahn sub. did all i could to fry one of
em just to see what would happen and nothing.

i'd say the biggest killer is heat. if you can heat up the voice coil
enough, of course something is gonna happen to it.

--
cyrus

*coughcasaucedoprodigynetcough*

"cyrus" wrote in message
...
In article .net,
"Pug Fugley" wrote:

Turning down the volume when you have audible distortion is the best way
to
not blow a speaker.


i concur.

But keep in mind that way more speakers are blown with too little power
than
with too much power. In fact I'd say it's rare to blow a subwoofer with
too
much power. Most folks just get el crapo amps and drive them into
clipping
therefore sending the speaker a sqaure wave and that will pop a voice
coil
in a heartbeat.




hehe here we go again..

for about a week i had an old zapco 25x2 amp running full range (no
x-over) on a cheap aw1200 audiobahn sub. did all i could to fry one of
em just to see what would happen and nothing.

Well..if you want to send a dirty, clipped, distorted, raw DC signal to a
speaker, a Zapco amp is the LAST amp you want to use. Zapco has to be the
cleanest power on the planet

Well..if you want to send a dirty, clipped, distorted, raw DC signal to a
speaker, a Zapco amp is the LAST amp you want to use. Zapco has to be the
cleanest power on the planet


No offense, but...what a crock.

First, if your amp is delivering DC to your speaker, then the amp is
broken. Even if you're driving the amp substantially into clipping
causing your waveform to resemble a square wave as you've stated, there
is not a DC component in the signal. If your meter is reading DC, it's
time to send your amplifier in to service.

Second, amplifiers are no more or less likely to be driven into clipping
if they're Zapcos or Jensens. If you're saturated, you're saturated.
I fail to see how the name on the front is going to prevent saturation
to any noticeable degree. I think you're probably confusing noise and
saturation, two very different and unrelated quantities.

Oh yeah, and what soundfreak said.

"Mark Zarella" wrote in message
.. .
Well..if you want to send a dirty, clipped, distorted, raw DC signal to
a
speaker, a Zapco amp is the LAST amp you want to use. Zapco has to be
the
cleanest power on the planet


No offense, but...what a crock.

First, if your amp is delivering DC to your speaker, then the amp is
broken. Even if you're driving the amp substantially into clipping
causing your waveform to resemble a square wave as you've stated, there
is not a DC component in the signal. If your meter is reading DC, it's
time to send your amplifier in to service.

Second, amplifiers are no more or less likely to be driven into clipping
if they're Zapcos or Jensens. If you're saturated, you're saturated.
I fail to see how the name on the front is going to prevent saturation
to any noticeable degree. I think you're probably confusing noise and
saturation, two very different and unrelated quantities.

Uhhh...yeah. So an amp driven into clipping will never blow a speaker? I
don't think so.

In article . net,
"Pug Fugley" wrote:


for about a week i had an old zapco 25x2 amp running full range (no
x-over) on a cheap aw1200 audiobahn sub. did all i could to fry one of
em just to see what would happen and nothing.

Well..if you want to send a dirty, clipped, distorted, raw DC signal to a
speaker, a Zapco amp is the LAST amp you want to use. Zapco has to be the
cleanest power on the planet



nuh uh, my deck is ok. the signal going to the amp was ok, i just turned
the gains on the amp to max. hell it was only 25x2 hehe

--
cyrus

*coughcasaucedoprodigynetcough*

Well..if you want to send a dirty, clipped, distorted, raw DC signal to a
speaker,

BTW: There is NO DC component to a clipped or distorted signal. Your amp is
faulty if there is DC at the outputs.

And if a Zapco has DC at the output then you should do the only decent thing
and retire it with a proper burial and funeral service, I would attend.

Les

"Soundfreak03" wrote in message
...
Well..if you want to send a dirty, clipped, distorted, raw DC signal to a
speaker,

BTW: There is NO DC component to a clipped or distorted signal. Your amp
is
faulty if there is DC at the outputs.

And if a Zapco has DC at the output then you should do the only decent
thing
and retire it with a proper burial and funeral service, I would attend.

umm..I think the entire thread is pretty much saying that the Zapco DOES NOT
have DC coming out of it. Re-read please.

Turning down the volume when you have audible distortion is the best way to
not blow a speaker.


True.

But keep in mind that way more speakers are blown with too little power than
with too much power. In fact I'd say it's rare to blow a subwoofer with too
much power. Most folks just get el crapo amps and drive them into clipping
therefore sending the speaker a sqaure wave and that will pop a
voice coil
in a heartbeat

Wrong. Underpowering Will NOT blow a speaker. There are a number of factors
that can allow your "100" watt amp to blow your "500" watt speaker, not the
least of which is the typical manufactures, well sneaky, ways of rating thier
products and the often overly inflated ratings of speakers.
The square wave in and of iteself does not blow speakers.
What you are talking about is an audio myth, underpowering does not damage
speakers by itself. I dont know anyone who has blown thier subs by
"underpowering" them but I know several, including some myself, that have blown
with too MUCH power.