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