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Topic:
70v math question
This thread has 29 replies. Displaying posts 1 through 15.
Post 1 made on Thursday May 18, 2017 at 12:20
Fins
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A client has an outdoor system that consists of a crown CDI 2000 amp (The specs state it's 800watts per channel in 70v), a buried sub, and 6 8" satellite speakers tapped at 60w. One channel of the amp is powering the sub in 8ohm mode and the other channel is powering the satellites.

How many more satellites can I add to this system?

Also, if the client wants it louder, would the best solution be max number of speakers at max tap (60w)? Or lower the tap and go higher on number of speakers?
Civil War reenactment is LARPing for people with no imagination.

Post 2 made on Thursday May 18, 2017 at 12:30
Ranger Home
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You need a 20% overhead, so based on that, you would have about eleven 60 watt speakers on one 800 watt channel.

Interested in hearing answers to your other question!
Post 3 made on Thursday May 18, 2017 at 13:01
ctjordan33
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On May 18, 2017 at 12:20, Fins said...
Also, if the client wants it louder, would the best solution be max number of speakers at max tap (60w)? Or lower the tap and go higher on number of speakers?

The decision here will depend on how far the speakers are from the listening area where they want it louder. If they're already placed near the listening area, a higher tap setting will be better. If they're far away, adding additional speakers closer to the area will make that seem louder. It will all depend on the SPL and distance from the speakers.
Post 4 made on Thursday May 18, 2017 at 13:10
Ernie Gilman
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My multiplication and division, addition and subtraction were wrong in this post. I've crossed out the original numbers I somehow came up with, and added the correct numbers:

On May 18, 2017 at 12:20, Fins said...
A client has an outdoor system that consists of a crown CDI 2000 amp (The specs state it's 800watts per channel in 70v), a buried sub, and 6 8" satellite speakers tapped at 60w. One channel of the amp is powering the sub in 8ohm mode and the other channel is powering the satellites.

6 speakers tapped at 60W is a setup to use 360 watts.

...Let's use 680 watts since all of these maxima only really matter when you're FULLY CRANKED.

You're set to use 360 watts now, so 520 320 watts are available. At 60 watts each, that's 8 2/3 5 1/3 more speakers.

How many more satellites can I add to this system?

8 2/3. Okay, 9, probably, at this setting. I'd add five. If I had to, I'd add six, since the system very likely won't ever be run at full volume.

Last edited by Ernie Gilman on May 18, 2017 20:35.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 5 made on Thursday May 18, 2017 at 13:31
Fred Harding
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More speakers at lower volume in answer to your question of more vs. louder
On the West Coast of Wisconsin
Post 6 made on Thursday May 18, 2017 at 13:35
highfigh
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Also, since nobody has mentioned it in this thread, are you aiming the speakers away from the building and firing outward, or are they firing toward the building? The latter is a much more efficient way to make sure the level is adequate and won't disturb people in nearby buildings. In addition, the sound reflecting from the building reinforces what's coming from the speakers, so it may be possible to cover the whole area better AND achieve a high SPL. Firing from the building is just being a glutton for punishment and requires a lot more power.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
OP | Post 7 made on Thursday May 18, 2017 at 13:41
Fins
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Currently all of the speakers are around a pool area. One in each corner and one in the middle of the longer sides. Its not a large pool. My understanding is the client wants to add more to this same area. If I went with Tuck's number and added 5, im guessing the speakers would end up about 20' apart.

Ernie, unless im not following your math, it looks like you came up with a total of 880 watts, which is more than the 800watts Crown says the amp can do. what am I not following with your explanation?
Civil War reenactment is LARPing for people with no imagination.

Post 8 made on Thursday May 18, 2017 at 13:50
lippavisual
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On May 18, 2017 at 13:31, Fred Harding said...
More speakers at lower volume in answer to your question of more vs. louder

This above will always be better, in 99% of install scenarios.

Highfigh has a point with using the house/building/pool house as a backdrop to stop the sound from travelling the open air.

Ernie, WTF?? Without the proper MATH, you can't have a proper design.

Fins, if he wants it louder and doesn't want to add more speaker locations, you can always change out those landscape satellites to a more full range speaker.

JBL Pro, please stand up!!
Post 9 made on Thursday May 18, 2017 at 15:11
iimig
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Number one fix to SPL (louder) is make sure you have the appropriate balanced +6db signal going to the amp. Is that already taken care of via cleanbox or similar?
The less I say, the smarter I will appear
Post 10 made on Thursday May 18, 2017 at 18:55
Zohan
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3 things to point out:

1. If it's am existing system it probably has a cleanbox already. If it doesnt, then adding one can help your volume levels.

2. 20' apart between speakers is way too much.

3. BBQ season is here, someone start up that thread again.
Post 11 made on Thursday May 18, 2017 at 20:33
Ernie Gilman
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On May 18, 2017 at 13:41, Fins said...
Ernie, unless im not following your math, it looks like you came up with a total of 880 watts, which is more than the 800watts Crown says the amp can do. what am I not following with your explanation?

No, you're awake and aware. I wasn't. My math is wrong. I've corrected it (Post 4).
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
OP | Post 12 made on Friday May 19, 2017 at 10:02
Fins
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On May 18, 2017 at 18:55, Zohan said...
3 things to point out:

1. If it's am existing system it probably has a cleanbox already. If it doesnt, then adding one can help your volume levels.

2. 20' apart between speakers is way too much.

3. BBQ season is here, someone start up that thread again.

1. There is a cleanbox already on the system. In my opinion, the system is painfully loud now. It's already resulted in at least on visit from the police.

2. This is a shot of the pool area. The speakers on the sides are near the fence. The four corners are just at the starting edge of the bushes. On the side at the steps, that means they are about 6' from chairs.

[URL=[Link: s247.photobucket.com]][IMG][/IMG][/URL]

3. Three words. Alabama white sauce. Next weekend is my wife's family annual reunion. I'm already itching to fire up the smoker and cook all week.
Civil War reenactment is LARPing for people with no imagination.

Post 13 made on Friday May 19, 2017 at 11:14
ceied
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On May 18, 2017 at 12:20, Fins said...
A client has an outdoor system that consists of a crown CDI 2000 amp (The specs state it's 800watts per channel in 70v), a buried sub, and 6 8" satellite speakers tapped at 60w. One channel of the amp is powering the sub in 8ohm mode and the other channel is powering the satellites.

How many more satellites can I add to this system?

Also, if the client wants it louder, would the best solution be max number of speakers at max tap (60w)? Or lower the tap and go higher on number of speakers?

if you werent a stupid inbred from the southeast you would know this... lmfao
Ed will be known as the Tiger Woods of the integration business, followed closely with the renaming of his company to "Hotties A/V". The tag line will be "We like big racks and tight holes"...
OP | Post 14 made on Friday May 19, 2017 at 17:13
Fins
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On May 19, 2017 at 11:14, ceied said...
if you werent a stupid inbred from the southeast you would know this... lmfao

No one asked you. You aren't even a US citizen anymore. You are in Florida. Lol


Btw Ernie, this system almost always runs at full volume. His neighbors love him.
Civil War reenactment is LARPing for people with no imagination.

Post 15 made on Friday May 19, 2017 at 18:06
Ernie Gilman
Yes, That Ernie!
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Ed just amazed me, and I've seen some pretty amazing things come out of his keyboard's mouth.

As for the neighbors, a rapper client in Sherman Oaks got a Doorbird installed. One of the first images saved in the cloud was a pair of cops at the front door at 3:45 on a Thursday night/Friday morning
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
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