file "Scoops were designed for dub boom, thats it"

8 years 9 months ago #11125 by levyte357
[attachment=0:191tluby]<!-- ia0 -->low_frequency_enclosures2.pdf<!-- ia0 -->[/attachment:191tluby]

[attachment=1:191tluby]<!-- ia1 -->jbl_scoop.JPG<!-- ia1 -->[/attachment:191tluby]

Guess not.

\"When in Vegas, do as the vegasians do\".
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8 years 9 months ago #11129 by nickyburnell
Replied by nickyburnell on topic "Scoops were designed for dub boom, thats it"
I'll get my coat
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8 years 9 months ago #11131 by levyte357
Replied by levyte357 on topic "Scoops were designed for dub boom, thats it"


Lockheed SR-71 Blackbird

Designed in 1964, still the world's fastest air breathing jet... Avoids enemy missiles by accelarating...

Nope it should be binned because it's old... :lol:

\"When in Vegas, do as the vegasians do\".

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8 years 9 months ago - 8 years 9 months ago #11132 by nickyburnell
Replied by nickyburnell on topic "Scoops were designed for dub boom, thats it"

levyte357 wrote:



Lockheed SR-71 Blackbird

Designed in 1964, still the world's fastest air breathing jet... Avoids enemy missiles by accelarating...

Nope it should be binned because it's old... :lol:



I'd have quoted Concorde ;)

Only joking, as you know. Now if I'd done that on the otherside, someone would have got aggresive :lol:

Joking aside, what is the reason that old plots of scoops dont show the 100hz or so dip, new plots do? I really dont get this, it the same in the Emmi book, the dip isn't there.

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8 years 9 months ago #11133 by levyte357
Replied by levyte357 on topic "Scoops were designed for dub boom, thats it"

nickyburnell wrote:
I'd have quoted Concorde ;)

Only joking, as you know. Now if I'd done that on the otherside, someone called King/Prince/Blood/Jah would have got aggresive :lol:

Joking aside, what is the reason that old plots of scoops dont show the 100hz or so dip, new plots do? I really dont get this, it the same in the Emmi book, the dip isn't there.


Couldn't quote Concorde, because even though it's newer, it's nowhere near as fast, or or anywhere near same max altitude.. smiley23

You have to take some of these sims/plots with pinch of salt.. Only way you'll really know what cab sounds like is from experience of listening to similiar cabs. Also, amp that has uber output stage and damping/control also changes driver/cab sound.

Not to mention uber bracing/decent timber.

Have personally experimented with 1850 scoops and dampening, and HR results were out the window.

\"When in Vegas, do as the vegasians do\".

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8 years 9 months ago #11135 by nickyburnell
Replied by nickyburnell on topic "Scoops were designed for dub boom, thats it"
Granted, but they must have been measuring differently, maybe direct and horn

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8 years 9 months ago #11136 by levyte357
Replied by levyte357 on topic "Scoops were designed for dub boom, thats it"

nickyburnell wrote: Granted, but they must have been measuring differently, maybe direct and horn


After 100's of sims of High BL/Low BL 18s in various scoops, I concluded high bl drivers like V18-1000, Tmax 1200, 1850 for peaky sub, but sacrifice is dip 50-100. And smooth musical response from 45hz upwards from mid bl drivers like Fane 18XB, V18-1200, Tmax 1000, Volt, Bline 800.

With strategically placed damping, I can run 1850/V18-1000 scoop 38-100hz, without nasty 80hz peak. smiley14

\"When in Vegas, do as the vegasians do\".

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8 years 9 months ago #11137 by nickyburnell
Replied by nickyburnell on topic "Scoops were designed for dub boom, thats it"
Still not what I meant.

Here is a typical modern plot
[attachment=0:yvhpf1bt]<!-- ia0 -->imagesCA7WEIRG.jpg<!-- ia0 -->[/attachment:yvhpf1bt]

Big dip.

Non of the older plots show this. I presume its the tranision between direct radiator and horn??
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8 years 9 months ago #11138 by levyte357
Replied by levyte357 on topic "Scoops were designed for dub boom, thats it"

nickyburnell wrote: Still not what I meant.

Here is a typical modern plot
[attachment=0:1wexxu81]<!-- ia0 -->imagesCA7WEIRG.jpg<!-- ia0 -->[/attachment:1wexxu81]

Big dip.

Non of the older plots show this. I presume its the tranision between direct radiator and horn??


Not sure, personally never run scoop above 100hz.

\"When in Vegas, do as the vegasians do\".

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8 years 9 months ago #11146 by tony.a.s.s.
Replied by tony.a.s.s. on topic "Scoops were designed for dub boom, thats it"
Regarding the "dip". Many years ago I came to the conclusion that the dip due to cancellation between the direct radiating speaker and the rear horn gave the cab its performance. As a lot of us know, 100-125hz is where a lot of speakers peak in terms of efficiency, which means it's at its loudest at this point. Due to masking effects any bass cab that has this prominent feature, will suffer in the low end, not because the bass isn't there, it's because the upper frequencies are louder. So, as with normal bass cabs I always took these frequencies down, so the bass was always deeper.
On a Scoop bin, this is a natural occurrence. On the RX18 and the S118, the dip is just after 100hz. So I would also tend to pull down the 100hz just a tad in addition.
The secret of the Scoop, what a wonderful piece of Science.

Peace and goodwill to all speaker builders

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