On 1/7/2014 11:17 PM, gregz wrote:
Jerry Stuckle wrote:
On 1/7/2014 2:29 AM, gregz wrote:
Jeff Liebermann wrote:
On Mon, 06 Jan 2014 23:23:56 -0500, Jerry Stuckle
wrote:

On 1/6/2014 11:04 PM, Jeff Liebermann wrote:
On Tue, 7 Jan 2014 03:19:54 +0000 (UTC), gregz
wrote:

Jerry Stuckle wrote:
On 1/6/2014 1:28 AM, gregz wrote:
wrote:
"only 3 db", but that's twice the signal. I have mine stacked 12 feet,
but I believe Winegard says either 8 or 10 feet. Mine work swell. +:^] I
got mine just after they were discontinued in 2005/6. Had to email a
number of suppliers until I found the second one. I bet there are some
still in storage somewhere, email different places that sell Winegard,
you may still find one.
John K9RZZ

Twice the signal means twice the voltage, for me.
Greg

Twice the voltage is a 6 db gain. Twice the power is a 3db gain.

Exactly. If I got 1 microvolt, 2 microvolts will be twice the signal.
Greg

Sorta. If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but only 1.414 times the signal power. That's why we have
units of measure to avoid such ambiguities. Just to be difficult,
working with antennas, the "signal" is the field strength measured in
dBuV/M. If you define what you're measuring and specify your units of
measure, you wouldn't be having such problems.

You've got it backwards, Jeff. Twice the voltage is 4 times the power.
1.414 times the voltage would be twice the power.

Very embarrassing. Temporary loss of IQ from working on my broken car
with a cold or flu this afternoon. It should be:
If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but 4 times the signal power.

Thanks for the correction (grumble)... Maybe if I go to sleep early,
when I wake up tomorrow, this didn't happen.


I have not really been specifying units. I was just going over the
situation in my mind, and I straightened out in rf terms.

I got this going out terminology. IF, in audio, I got two speakers
transmitting equal energy, with two amps or channels, and I receive that
totally in phase, I got twice the signal or 6 dB power increase. I've
measured it. It's true. Same thing would happen with two antennas with two
transmitters. Two antennas, one transmitter, with one splitter would only
give 3 dB power increase at the receiver. I'm just thinking out loud. I had
to ease my mind. I think I'm ok now. Almost bedtime.

Greg


No, two in-phase speakers provide 3db increase, not 6db.

If you could double the signal and get 4x the power you could make
gazillions! Of course, you'd be creating energy out of nothing, but who
cares about the laws of physics?

The reason big speaker systems work in large places is efficiency gain
using multiple arrays, must be in phase. As I was saying, it's a known
fact, which I have measured. You can actually get near 10 dB gain using
several speakers. It's why horn loudspeakers have gain, better impedance
matching to air.

I once believed two in phase speakers provided 3 dB increase also. I then
read a speaker project by the now famous diAppolito configuration designer
in Speaker Builder magazine 80's ?. I can try to find a reference.

Greg


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing, which is what you would be doing if you quadrupled the power
(6db gain) by placing two speakers in phase. If you "measured" this,
you need a new meter.

I would love to tear apart your "reference".

--
==================
Remove the "x" from my email address
Jerry, AI0K

==================

Jerry Stuckle wrote:
On 1/7/2014 11:17 PM, gregz wrote:
Jerry Stuckle wrote:
On 1/7/2014 2:29 AM, gregz wrote:
Jeff Liebermann wrote:
On Mon, 06 Jan 2014 23:23:56 -0500, Jerry Stuckle
wrote:

On 1/6/2014 11:04 PM, Jeff Liebermann wrote:
On Tue, 7 Jan 2014 03:19:54 +0000 (UTC), gregz
wrote:

Jerry Stuckle wrote:
On 1/6/2014 1:28 AM, gregz wrote:
wrote:
"only 3 db", but that's twice the signal. I have mine stacked 12 feet,
but I believe Winegard says either 8 or 10 feet. Mine work swell. +:^] I
got mine just after they were discontinued in 2005/6. Had to email a
number of suppliers until I found the second one. I bet there are some
still in storage somewhere, email different places that sell Winegard,
you may still find one.
John K9RZZ

Twice the signal means twice the voltage, for me.
Greg

Twice the voltage is a 6 db gain. Twice the power is a 3db gain.

Exactly. If I got 1 microvolt, 2 microvolts will be twice the signal.
Greg

Sorta. If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but only 1.414 times the signal power. That's why we have
units of measure to avoid such ambiguities. Just to be difficult,
working with antennas, the "signal" is the field strength measured in
dBuV/M. If you define what you're measuring and specify your units of
measure, you wouldn't be having such problems.

You've got it backwards, Jeff. Twice the voltage is 4 times the power.
1.414 times the voltage would be twice the power.

Very embarrassing. Temporary loss of IQ from working on my broken car
with a cold or flu this afternoon. It should be:
If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but 4 times the signal power.

Thanks for the correction (grumble)... Maybe if I go to sleep early,
when I wake up tomorrow, this didn't happen.


I have not really been specifying units. I was just going over the
situation in my mind, and I straightened out in rf terms.

I got this going out terminology. IF, in audio, I got two speakers
transmitting equal energy, with two amps or channels, and I receive that
totally in phase, I got twice the signal or 6 dB power increase. I've
measured it. It's true. Same thing would happen with two antennas with two
transmitters. Two antennas, one transmitter, with one splitter would only
give 3 dB power increase at the receiver. I'm just thinking out loud. I had
to ease my mind. I think I'm ok now. Almost bedtime.

Greg


No, two in-phase speakers provide 3db increase, not 6db.

If you could double the signal and get 4x the power you could make
gazillions! Of course, you'd be creating energy out of nothing, but who
cares about the laws of physics?

The reason big speaker systems work in large places is efficiency gain
using multiple arrays, must be in phase. As I was saying, it's a known
fact, which I have measured. You can actually get near 10 dB gain using
several speakers. It's why horn loudspeakers have gain, better impedance
matching to air.

I once believed two in phase speakers provided 3 dB increase also. I then
read a speaker project by the now famous diAppolito configuration designer
in Speaker Builder magazine 80's ?. I can try to find a reference.

Greg


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of nothing,
which is what you would be doing if you quadrupled the power (6db gain)
by placing two speakers in phase. If you "measured" this, you need a new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg

On 1/8/2014 10:22 PM, gregz wrote:
Jerry Stuckle wrote:
On 1/7/2014 11:17 PM, gregz wrote:
Jerry Stuckle wrote:
On 1/7/2014 2:29 AM, gregz wrote:
Jeff Liebermann wrote:
On Mon, 06 Jan 2014 23:23:56 -0500, Jerry Stuckle
wrote:

On 1/6/2014 11:04 PM, Jeff Liebermann wrote:
On Tue, 7 Jan 2014 03:19:54 +0000 (UTC), gregz
wrote:

Jerry Stuckle wrote:
On 1/6/2014 1:28 AM, gregz wrote:
wrote:
"only 3 db", but that's twice the signal. I have mine stacked 12 feet,
but I believe Winegard says either 8 or 10 feet. Mine work swell. +:^] I
got mine just after they were discontinued in 2005/6. Had to email a
number of suppliers until I found the second one. I bet there are some
still in storage somewhere, email different places that sell Winegard,
you may still find one.
John K9RZZ

Twice the signal means twice the voltage, for me.
Greg

Twice the voltage is a 6 db gain. Twice the power is a 3db gain.

Exactly. If I got 1 microvolt, 2 microvolts will be twice the signal.
Greg

Sorta. If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but only 1.414 times the signal power. That's why we have
units of measure to avoid such ambiguities. Just to be difficult,
working with antennas, the "signal" is the field strength measured in
dBuV/M. If you define what you're measuring and specify your units of
measure, you wouldn't be having such problems.

You've got it backwards, Jeff. Twice the voltage is 4 times the power.
1.414 times the voltage would be twice the power.

Very embarrassing. Temporary loss of IQ from working on my broken car
with a cold or flu this afternoon. It should be:
If you got 1 microvolt, 2 microvolts will be twice the signal
voltage but 4 times the signal power.

Thanks for the correction (grumble)... Maybe if I go to sleep early,
when I wake up tomorrow, this didn't happen.


I have not really been specifying units. I was just going over the
situation in my mind, and I straightened out in rf terms.

I got this going out terminology. IF, in audio, I got two speakers
transmitting equal energy, with two amps or channels, and I receive that
totally in phase, I got twice the signal or 6 dB power increase. I've
measured it. It's true. Same thing would happen with two antennas with two
transmitters. Two antennas, one transmitter, with one splitter would only
give 3 dB power increase at the receiver. I'm just thinking out loud. I had
to ease my mind. I think I'm ok now. Almost bedtime.

Greg


No, two in-phase speakers provide 3db increase, not 6db.

If you could double the signal and get 4x the power you could make
gazillions! Of course, you'd be creating energy out of nothing, but who
cares about the laws of physics?

The reason big speaker systems work in large places is efficiency gain
using multiple arrays, must be in phase. As I was saying, it's a known
fact, which I have measured. You can actually get near 10 dB gain using
several speakers. It's why horn loudspeakers have gain, better impedance
matching to air.

I once believed two in phase speakers provided 3 dB increase also. I then
read a speaker project by the now famous diAppolito configuration designer
in Speaker Builder magazine 80's ?. I can try to find a reference.

Greg


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of nothing,
which is what you would be doing if you quadrupled the power (6db gain)
by placing two speakers in phase. If you "measured" this, you need a new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

--
==================
Remove the "x" from my email address
Jerry, AI0K

==================

We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)

So, matching output impedance of amplifier to speaker will result in
maximum energy transfer and using the most efficient speakers will
result in of course more acoustic energy produced. All we are talking
about here is not wasting energy in poor efficiency systems.

On 1/9/2014 10:53 AM, boomer wrote:


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers
get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like
me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)


I would hate to have you as my neighbor. I would have to call the police
on you.

On 1/9/2014 11:00 AM, John S wrote:
On 1/9/2014 10:53 AM, boomer wrote:


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers
get
their "gain" by directing more energy in one direction; there is a
loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db
gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like
me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)


I would hate to have you as my neighbor. I would have to call the police
on you.

We live in the North country close to the border. Our home, as are all,
is heavily insulated. I run the music loud as I want without bothering
the neighbours. The high wattage rating per channel is mostly just for
the incredibly low terminal impedance. This makes for very good fidelity
on high power low frequency. It is called inertial dampening. You have
to run large diameter wire to keep this all working. I have the speakers
hooked up with #10 wire. I checked performance of the speakers for this
type wire by running one speaker with #16 lamp cord which I had been
using and the other one hooked up with #10. I then switched to mono on
the preamp. Using the balance control clearly showed a very noticeable
improvement. I was told to use large dia wire to keep the resistance
very low. I first thought this was really over-kill but by experiment I
found that my advisor was correct. The impedance from the amp and wiring
should be in the very low milliohms to prevent inertial overshoot.
Purple Haze definitely sounded better :-)

PS some have actually used #00 wire to their speakers. Without
experimenting myself I feel by guessing that this is over-kill. I could
be wrong, I was before.

boomer wrote:
On 1/9/2014 11:00 AM, John S wrote:
On 1/9/2014 10:53 AM, boomer wrote:


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers
get
their "gain" by directing more energy in one direction; there is a
loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db
gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like
me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)


I would hate to have you as my neighbor. I would have to call the police
on you.

We live in the North country close to the border. Our home, as are all,
is heavily insulated. I run the music loud as I want without bothering
the neighbours. The high wattage rating per channel is mostly just for
the incredibly low terminal impedance. This makes for very good fidelity
on high power low frequency. It is called inertial dampening. You have to
run large diameter wire to keep this all working. I have the speakers
hooked up with #10 wire. I checked performance of the speakers for this
type wire by running one speaker with #16 lamp cord which I had been
using and the other one hooked up with #10. I then switched to mono on
the preamp. Using the balance control clearly showed a very noticeable
improvement. I was told to use large dia wire to keep the resistance very
low. I first thought this was really over-kill but by experiment I found
that my advisor was correct. The impedance from the amp and wiring should
be in the very low milliohms to prevent inertial overshoot. Purple Haze
definitely sounded better :-)

PS some have actually used #00 wire to their speakers. Without
experimenting myself I feel by guessing that this is over-kill. I could
be wrong, I was before.

Yo only get so much damping with small wire. Most of it is determined by
the driver box design, driver, and resistance in the coil. What you gain
most is a more even driving Z to cover changes in speaker Z throughout the
response range.

Greg

"boomer" wrote in message
news:_fDzu.213384$4q1.203346@en-nntp-
PS some have actually used #00 wire to their speakers. Without
experimenting myself I feel by guessing that this is over-kill. I could be
wrong, I was before.

While going from # 20 or so speaker wire to # 10 is often helpful, I doubt
going much larger is going to help unless you have a very long run.

Lots of things are over sold to te audio people. Best one I know of is some
special oxygen free teflon wire ( or something like that) that replaces the
line cord to the wall outlet for over $ 100. Even if it actually did
something, that extra 50 or so feet of regular wire back to the breaker box
and other wire to the main power feed would make it worthless.



---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

On 1/9/2014 11:53 AM, boomer wrote:


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers
get
their "gain" by directing more energy in one direction; there is a loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like
me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)

So, matching output impedance of amplifier to speaker will result in
maximum energy transfer and using the most efficient speakers will
result in of course more acoustic energy produced. All we are talking
about here is not wasting energy in poor efficiency systems.



OK, so instead of putting out 100W to one eight-ohm speaker, you're
putting out 100W to two eight ohm speakers. So you have a 3db gain,
assuming the speakers are in phase.

It is no different than feeding two eight-ohm speakers from separate
100W amplifiers, and the results are the same.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.

==================

On 1/9/2014 11:06 AM, Jerry Stuckle wrote:
On 1/9/2014 11:53 AM, boomer wrote:


We aren't talking multiple arrays in large places. Of course multiple
speakers will provide more gain than one speaker. And horn speakers
get
their "gain" by directing more energy in one direction; there is a
loss
of signal in other directions. It has nothing to do with "impedance
matching to the air" (there is no such thing).

The laws of physics say it is impossible to create energy out of
nothing,
which is what you would be doing if you quadrupled the power (6db
gain)
by placing two speakers in phase. If you "measured" this, you need a
new meter.

I would love to tear apart your "reference".

Non believer in facts. If you don't believe you should do tests, like
me.

I'll skip the horn for now..

If you can't believe two speakers will move TWICE the air doubling
intensity, I don't know what else to say, except test yourself.

Greg


I have (I was an EE major). You can't create energy from nothing. The
laws of physics don't allow it. And I currently have a business which
deals with home entertainment systems.

At MOST, two speakers in phase can move twice the air. No more, and in
reality, because of inefficiencies, it will be less.

I hate to question the law of conservation of energy at all, but I must
say that there could be more energy delivered from two 8 ohm speakers in
parallel than a single speaker powered by the same amplifier. Many
amplifiers have 4 ohm outputs. So, you see the possibility. You would be
delivering the same energy to both speakers as was delivered to one.

Of course for those who believe in magical energy production, no
reasoning will help.

I personally have a Crown 810 powering a couple of AR SRT380s. The
amplifier has 4 ohm outputs and the speakers are 4 ohms. There is
nothing to be done to increase sound power except buy more efficient
folded horn types. I have neither the space nor money to do so. However,
at 420 watts rms per channel as it is now, I really don't require more
power. Jimmy Hendrix sounds just fine to me. :-)

So, matching output impedance of amplifier to speaker will result in
maximum energy transfer and using the most efficient speakers will
result in of course more acoustic energy produced. All we are talking
about here is not wasting energy in poor efficiency systems.



OK, so instead of putting out 100W to one eight-ohm speaker, you're
putting out 100W to two eight ohm speakers. So you have a 3db gain,
assuming the speakers are in phase.

It is no different than feeding two eight-ohm speakers from separate
100W amplifiers, and the results are the same.


exactly