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.


Don't try to design a speaker using parallel midrange units. Your speaker
will fail due to the midrange gain.

Greg