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Old 15th November 2004, 12:39 PM   #31
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be careful or build a 16 driver speaker with tweets
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Old 15th November 2004, 02:48 PM   #32
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Quote:
Originally posted by David_Larkins
I meant to ask about this before, but it slipped my mind...

The NSB's are rated for 10 watts max each... If I use 8 or 10 of these in an array, am I going to be ok driving them with my Adcom GFA-555 which is 200 wpc into 8 ohms? or am I going to have to be VERY careful?

I don't know about watts any more frankly. These drivers are something like 86 dB/W sensitive and 8 of them in a line would be something like 95 dB/W. That's 1 Watt giving you 95 dB. I turned an SPL meter on one day when I had my lines (16 NSBs per side) cranked in my living room just to find out how loud I actually listen to music. It turned out that I was in the mid 80's. Hence I'm feeding them less than a Watt. I'm not sure you really have to worry about actually using all 200 watts.

Somebody correct me if I'm wrong here, but with that many drivers you have to worry more about your hearing than about blowing out the drivers.
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Old 15th November 2004, 03:57 PM   #33
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I have a GFA-5500 but I have never connected it to my LA's. It's kind of collecting dust That being said, I am using a BrianGT LM3875 and they will make you ears bleed with a 16 driver LA. It's like getting kicked by a mule in the chest. That's 56 watts a side into 8 ohms, maybe then ~70 watts into my nominal 5 ohm LA's. I am certain that 200 would be way too much for eight of 'em. Just don't turn it up to eleven.
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Old 15th November 2004, 04:23 PM   #34
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Quote:
Originally posted by chipco3434
Just don't turn it up to eleven.
Got it! Thanks.
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Old 15th November 2004, 04:53 PM   #35
cjd is offline cjd  United States
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FWIW, they also seem to be pretty robust drivers. I'm sure you could kill one (I haven't tried... yet) but your ears would likely be dead long before.

C
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Old 15th November 2004, 05:14 PM   #36
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The SPL measurements of line arrays aren't that meaningful. Yes the 8 drivers gets you from 86 to 95db of total acoustical power, but if you put the mic 1 meter in front of the array you probably aren't going to get anywhere near 95db at one watt. This is because the drivers aren't all focused at the mic. The line array's advantage is that if you have 90db at 1 meter, you'll have 87db at 2 meters with the array and only 84db with the point source. Plus that 87db will be anywhere within the plain of the array's height on the same axis, but with the point source speaker the 84db will only be in that spot. Higher or lower will have a further significant reduction in SPL.
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Old 16th November 2004, 02:59 PM   #37
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Quote:
Originally posted by johninCR
The SPL measurements of line arrays aren't that meaningful. Yes the 8 drivers gets you from 86 to 95db of total acoustical power, but if you put the mic 1 meter in front of the array you probably aren't going to get anywhere near 95db at one watt. This is because the drivers aren't all focused at the mic. The line array's advantage is that if you have 90db at 1 meter, you'll have 87db at 2 meters with the array and only 84db with the point source. Plus that 87db will be anywhere within the plain of the array's height on the same axis, but with the point source speaker the 84db will only be in that spot. Higher or lower will have a further significant reduction in SPL.

Thanks John. That's useful information. They're still effin' loud!
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Old 17th November 2004, 01:51 AM   #38
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Quote:
Originally posted by cjd
FWIW, they also seem to be pretty robust drivers. I'm sure you could kill one (I haven't tried... yet) but your ears would likely be dead long before.

C
From my experience, these are some robust drivers! One time I let one have the full force of my 250 watt amp, and (though it sounded like hell) it didn't physically break or catch on fire within the minute I let it go.

Also, to John- thanks for setting me (and anyone else) straight with line arrays in-room, and Dr Griffin's papers. It's given me ample food for thought on my next project.

Joe
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