On Sat, 9 Dec 2017 08:59:59 +1100, Clifford Heath
wrote:

On 08/12/17 18:07, wrote:
On Fri, 8 Dec 2017 09:00:50 +1100, Clifford Heath
wrote:
On 08/12/17 08:35, Fred Smith wrote:
On 2017-12-07, wrote:
However, I need a means to send only the bass to the amp that powers the
Subwoofer. Is there any sort of crossover made that goes in the input of
the power amps, after the preamp?
Commonly done, even in my son's old Altec computer speakers.
Clifford Heath.
Funny you mentioned the Altec name. My 600W power amp and the preamp are
Altec Lansing brand. The speakers are Yamaha.

Haha - I have the opposite, a Yamaha A-520 amp and a pair of
Altec Lansing "Eights", upgraded with new kevlar dome tweeters
instead of the awful piezos, and fantastic new mids. The Eights
were their first entry into the audiophile market, I believe.

That's interesting. Altec Lansing made some great stuff back in the day.
I recently saw some computer speakers with their name on it. I had sort
of heard they went out of business, but it looks like they are still
around. Yamaha was not a name I was all that familiar with, but I like
these speakers.

That Crown amp is pretty decent too. I had heard of them, but this was
the first thing I own of theirs....

Are you familiar with the Grateful Dead's "wall of sound". That was
considered the biggest sound system ever made at that time (early 70s).

Yes, I recall watching a doco on Youtube about it.

Clifford Heath

I saw at least one of them videos too. The Grateful Dead was not only a
good band, but they played a big part in electronics as far as sound
systems. But that they had, was just too big for portable use. One of
them articles said they needed 4 semi truck trailers to haul everything
and a crew of something like 25 people to set it up at a huge cost.
After all, that was all setup for ONE SHOW. A show that was probably 3
or 4 hours long, and it said it took as much as a week to setup. They
almost went bankrupt doing it, but looking back, they played a huge part
in today's stage sound systems.

This may be of interest too. Back in the 80's I was told about a band
that used their sound system to simulate and earthquake. They were
playing at a fairly small bar/club in a nearby city. (Thats when I lived
in the city). I went to the show, and it was something I have never been
able to explain, exceot to say it was very awesome.

After playing a really good show of old rock music, they go to their
last song and all of a sudden the whole building began to shake. Just an
extremely powerful low bass sound that made me feel like I was detached
from the floor and there were literally glasses falling off tables and
you could see ripples in glasses of beer and drinks. I have never felt
anything like it..... Unfortunately I can not remember the name of that
band, that was many years ago, and I am sure they are no longer playing.
I remember after they finished playing, I asked a bartender who pays for
the broken glasses, and they said the band had in their contract to pay
for all damages, and explained the whole process, so as not to freak out
the bar owners/workers.

Actually, aside from a dozen or so drink glasses, there was no damages,
no broken windows in the building or anything like that. It was all
controlled well, but to this day, I wish I knew what they were running
for amplifiers and speakers.... I do think the sound was in the freq
range of around 28 to 32 cps. I have runs my audio generator thru that
range and gotten a similar feeling, but not as powerful. For some
reason, that frequency range has a very powerful effect.

I have often wondered if that has anything to do with it being half of
the cps of our 60 cycle voltage we use???? But I cant see how the two
have any relation except that it's a mathematical fact.....

I have always had a fascination with sound systems since I was in my
teens and I did sound for several bands over the years. Everytime I
think I'm too old to do that stuff anymore, some band comes along, and
I'm doing it again. The latest is a local small band who are excellent
musicians but they were trying to run the sound on the stage and play at
the same time. They did a halfway decent job running the sound, but I
offerred to run sound for them at an outdoor show, which was part of a
very poorly organized new festival which got few people to attend. They
were playing to a crowd of about 10 people and during their break, they
said they considered it "practice", but they were getting paid to do it,
regardless of the audience. That's when I asked if I could run the sound
system, after telling them what I did in the past. Ever since, I run
their sound when they play locally. They cant really pay me, but usually
buy me dinner and stuff, but I just like doing it, so what the heck!!!
I'm having fun and they like the results....