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Super 914/ Scoop plan loaded down to 30hz
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Osian123 View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Osian123 Quote  Post ReplyReply Direct Link To This Post Topic: Super 914/ Scoop plan loaded down to 30hz
    Posted: 06 January 2026 at 4:15pm
Hi,

I was looking at scoop plans that can play down to 30hz and found the 914, has anyone had any experience with this scoop? And how PD186/2’s fair loaded in it, would I need to modify it? 

Many thanks!
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Maze View Drop Down
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Points: 198 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Maze Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2026 at 11:55am
I was curious about this design years ago, I don't think anyone on here have ever made them.
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2026 at 1:12pm
No 18" Scoop is going do much useful, down to 30hz, especially with a driver, as terrible as the PD186/2.

Especially if you are going to use cheap amps or crap drivers.

I drew up a plan, that really excels with modern scoop drivers.

Is great with the Rolls Royce driver, 18sound 18NLW 9601, down to 32hz.
I have 1x prototype built.

PM if interested,


Edited by levyte357- - 07 January 2026 at 1:15pm
Global Depopulation - Alive and Killing.
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Osian123 View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Osian123 Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2026 at 7:11pm
Hi, 

Thanks for your reply, unfortunately I have no where near the £ to buy 4 new drivers and a new sub amp. I am currently running fane scaled up scoops, and will be using a Crest CA18 on sub.

I am currently having a S&P pre amp made and noticed that they go down to 30hz, being able to play well below 40hz is a very important thing for my system, but I am unsure how to go all the way to 30hz,  without having to recone drivers constantly. Are there any ways to modify existing scoop plans to go slightly lower? Any guidance is appreciated!

Cheers
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2026 at 10:01pm
Can assure you, if your system can reproduce 38hz with authority from 4x Scoops, it will sound like 32hz.

However these parameters, are almost the worse, for a driver intended for Scoops.
PD 186/2 Thiele Small Parameters

Fs 34.18 Hz
Re 6.19 Ω
Qms 10.77
Qes 0.55
Qts 0.52
Le (@ 1 kHz) 1.95 mh
Vas 192.15 litres
Mms 203.93 g
Sd 1134.11 cm2
Cms 106.67 µm/N
BL 22.18 T/m
Xmax 10.5 mm
Vd 1.2 litres
Ref. Efficiency 2.05%
EBP 62.14 Hz

Sorry, but you can't polish a turd.

Also, you will notice the resonant frequency is 34hz, so you will need excess eq boost, to reproduce 30h z with worthwhile SPL, and the BL is not sufficient, to rein in the driver motion with authority, when you add the e.q.boost needed.

If you can't afford big man drivers, like the PD1852 or better, you will have to lower your expectations.

Please also be aware, if you are playing at venues, without 32A supply, the CA18 will clip like a Christmas tree, and not do much useful. especially with 30hz HPF.


Edited by levyte357- - 07 January 2026 at 10:02pm
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Osian123 View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Osian123 Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2026 at 11:28pm
Ah ok, so with my setup using a pre that goes down the 30hz, I will need to use a DSP to keep my drivers safe from over excursion? 
Once I get some £ I’ll invent in some “big man” drivers.

Cheers
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2026 at 12:01am
Originally posted by Osian123 Osian123 wrote:

Ah ok, so with my setup using a pre that goes down the 30hz, I will need to use a DSP to keep my drivers safe from over excursion? 
Once I get some £ I’ll invent in some “big man” drivers.

Cheers

Would suggest first thing you do, is forget about 30hz.
Then sell your drivers,

Trying to get 30hz from 18" Scoops, will just have you reconing drivers after every gig.

In the Mykey Scaled up Scoops, with 1852s, in pairs, would suggest 38hz HPF.

In stack of 4x, it will sound like 32hz.

If you had posted here before spending money, I would have suggested MS18 Mk1 Mini Scoops, loaded with PD1851s.


Edited by levyte357- - 08 January 2026 at 12:06am
Global Depopulation - Alive and Killing.
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paulus View Drop Down
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Points: 3237 		Post Options Post Options   Thanks (0) Thanks(0)   Quote paulus Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2026 at 10:33am
100% +1
 back in the day used to cross at 30 hz 1850 loaded scoops, crest ca18 copy red lights on , then wind up to 37hz with a 48 db slope , lights go out , then you are free you turn it up again , no real change in low at all , but way more spl . bit crude but easy way to explain , this is how i learned in the early days :)  for ref i use some full size 1852 loaded scoops and cut them 37 to 77 with a little parametric at 45hz and they bend your face full tilt  :) 


Edited by paulus - 08 January 2026 at 10:36am
TRENDSETTER SOUND SYSTEM
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Osian123 View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Osian123 Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2026 at 10:50am
Hi,

Cheers for the reply!

I will forget about 30, but I am still fairly keen to cross them down to 35ish, have played around with crossing at 38 and at 34 and some tunes are totally different when crossed lower (some roots form the 70s) not just some modern digi steppas.

Anyone have any recommendations of modifications or scoop designs that will play down there safely, I heard the polar design could go down the 32?

Many thanks
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