W sub bin 4818

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Posted: 15 December 2021 at 6:51pm

Thanks guys ,

It is about DnB sounding mostly , so lows are mandatory .

Actually my sigma pro 18s are already placed in ported simple boxes , but i need some more efficient boxes

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Posted: 15 December 2021 at 9:57pm

It depends......

Looking again at the sigma specs, and comparing to the recommended rcf 18" driver for that 4818 wbin, they are not that much far off...... sigma has 2mm less xmax, and a smaller voice coil, but should work in the box.

A stack of four will drop flat to 45 Hz, and 40 Hz at -5 dB.

It might be a workable compromise. Sub 40Hz tones are somewhat rare, even in drum n bass. In my personal raggajungle&drum n bass collection there are only a few records that really dig all the way down to 35 or even 30 Hz with full force.

But if you want to have real pressure down to 30 Hz you will have to upgrade in the future.

If it is not too complicated and expensive (lots of plywood required) for a "temporary solution", you might give the 4818 a go anyway.

Oh, and for stacking height, you might want to build 6 cabinets anyway....

Those Oberton tops look deafening. additilnal two boxes should also help you drop low enough.....

Edited by bob4 - 15 December 2021 at 10:01pm

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https://www.oberton.com/bg/%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D0%B8/%D1%82%D0%BE%D0%BD%D0%BA%D0%BE%D0%BB%D0%BE%D0%BD%D0%B8/81-%D0%B1%D0%B0%D1%81%D0%BE%D0%B2%D0%B8/314-sb118.html

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Posted: 16 December 2021 at 12:53am

I agree completely, bob4

One more thing i am not familiar with , when tops are rear horn loaded what if underneath them is a front loaded bass bin like T cab , should i play with delay by the dsp to to be perfectly phased ? Been told that by default T bin driver shoul be inverted 180degr. ,- EV T18 bins for example (there is a Oberton copy of them , and btw i like them alot , with Oberton Xb700 18 they are powerful

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Posted: 16 December 2021 at 1:17am

It's very rare to encounter a PA system that doesn't need some form of delay and DSP processing to be phase coherent.

Also, I don't know if anyone else unravelled the link in the original post, but it's quite surprising that a supposedly professional brand like Oberton make and sell blatant copies of existing Funktion One products:
https://www.oberton.com/bg/%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D0%B8/%D1%82%D0%BE%D0%BD%D0%BA%D0%BE%D0%BB%D0%BE%D0%BD%D0%B8/79-%D1%81%D0%B5%D1%80%D0%B8%D1%8F-%D1%82/303-t1581.html

Unless looks are very deceiving, this box is using a band pass horn for the low-frequency section, not a rear-loaded horn. This box alone will benefit from delay - even the latest F1 settings have some applied.

If you need someone who can help you with phase alignment in Sofia once you have the system, I know a guy.

Edited by toastyghost - 16 December 2021 at 1:19am

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https://www.oberton.com/bg/%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D0%B8/%D1%82%D0%BE%D0%BD%D0%BA%D0%BE%D0%BB%D0%BE%D0%BD%D0%B8/79-%D1%81%D0%B5%D1%80%D0%B8%D1%8F-%D1%82/303-t1581.html

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Posted: 16 December 2021 at 1:35am

toastyghost wrote:

It's very rare to encounter a PA system that doesn't need some form of delay and DSP processing to be phase coherent.

Also, I don't know if anyone else unravelled the link in the original post, but it's quite surprising that a supposedly professional brand like Oberton make and sell blatant copies of existing Funktion One products:

The T1581 can't be found using the search facility on Oberton site - in fact
no finished loudspeakers at all are availbale if you've clicked the Union Flag
at the top left of the page.

Almost like they don't want English speakers to be able to see what they
produce apart from drive units

Clicking the Bulgarian flag gives us access to these:

LIne Array

6 different loudspeaker series

Bass cabs

Monitors

and a 15" active cab:

If your vaccinations were mandatory and nobody in your class had measles,
then you know that you're not a Millenial kid.</f

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Posted: 16 December 2021 at 1:47am

Hello to you ,

Nice to see your opinion here , thank you .

As a hobbyist my knowledge and skills about dealing with the delays on my dcx2496 is not good at all , and in a combination with lets say horn loaded or hybrids cabs .

So any advices would be highly appreciated .

About those replicas of the f- one i agree , and as i know Oberton's owner and Tony from f one were close friends ,just before oberton did those .

Any way i am very happy to own them , they are almost brand new and i got them for a good price as well .

15" low driver is facing up in the closed chamber and magnet is in to the horn chamber facing down, so that is why i call them rear horn loaded , which i think is more suitable than bandpass 4th order .

Need that contact of the local guy from Sofia .

Regards

To all of you involved here

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Posted: 16 December 2021 at 1:55am

Lets focus at my needs for a suitable subs .

Could you please all of you agree that ,Oberton have their policy which shouldnt be our business here .

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Posted: 18 December 2021 at 11:07am

When talking efficient, it boils down to hornloaded, but to work properly in the lower regions, it's going to be big and needs to be used in multiples and that's not going to work out in a 2 a side proposition.

I would double up the 18" you already have an make 4 dual 18" BR cabs.

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Posted: 19 December 2021 at 8:53pm

Highfimike wrote:

15" low driver is facing up in the closed chamber and magnet is in to the horn chamber facing down, so that is why i call them rear horn loaded ,

Rearloaded horn is a specific, already defined term not open to interpretation. It is a synonym for scoop/backloaded horn. The driver front (membrane) radiates sou nd directly, and in addition to that, the rear of the driver is also loading a horn.

Since the front of the driver in the oberton cabinet is not radiating sound outwards, it is not a rearloaded horn.

Enough nitpicking for tonight Ouch

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Posted: 19 December 2021 at 8:59pm

Highfimike wrote:

Lets focus at my needs for a suitable subs .

You haven't mentioned any of your circumstances.

What kind of amplifiers do you have for your bass section? Processing?

Budget? Facilities? Carpentry/woodworking skills? Available tools?

Another possibility, if you have the finances, would be to simply get rid of your sigma woofers and update to something stronger, modern. For example b&c 18ds115 has almost 3 times as much xmax as your current woofers.

So in theory, one 18ds115 has same displacement capacity as 2,5 of your eminence woofers.

If you plan to build big complex boxes anyway, why not use top of the line modern drivers? You will get louder with less boxes.

So many options nowadays. Front loaded horns. Ported horns. Paraflex etc......

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