EAW BH882 plans for you all!!! |
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discomusic1978
New Member Joined: 30 October 2017 Location: Lancaster Ca Status: Offline Points: 8 |
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Hey cool are you using an RCF L18-851kn which is what EAW made the BH882 for or are you using something else....
I am building a couple also but want to get down in the 20 something herz....range? If I do that the box will have to be a few inches deeper to accommodate the deeper frame woofer....? Let me know your thoughts on that And thanks for getting back to me Anthony |
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re-production
Registered User Joined: 16 February 2017 Location: Suffolk UK Status: Offline Points: 176 |
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Hi Anthony,
I am using oberton xb 1500. Most ”horn suitable” drivers came back with similar Sims so I made the decision based on tone. For this one we didn’t modify the dept and probably should have so that it would more suited to modern drivers. Personally I wouldn’t see the need for the horn to drop down to 20hz, 35hz seems low enough for my ears but depends what you want to use it for. One thing I would certainly recommend is splitting the box into two, known as emeralds, this means you can actually move them around if you need to. If you are ever around Suffolk/Norfolk way you are more than welcome to come have a listen!! Andrew |
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APC321
Young Croc Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 680 |
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Court Black Box: 1100mm wide x 750mm high x 650 deep.
EAW BH882: 1511mm wide x 1066mm high x 910mm deep. I know its not a direct comparison, but the Court Black Box is just too big and heavy to be practical, so the EAW is insane. People may say that the EAW is for installs, but in my experience the bigger the boxes that you install, the faster that the club goes out of business. (Murphy's Law?) |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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The Black Box is the same size as most dual 18" boxes, how many of those do you see?!
It really isn't that impractical, especially if split into Emeralds. Big boxes are needed if you want to get low and loud, and have directivity in low frequencies, which the Bertha does well especially with the horn. Edited by toastyghost - 01 November 2017 at 4:33pm |
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discomusic1978
New Member Joined: 30 October 2017 Location: Lancaster Ca Status: Offline Points: 8 |
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I am trying to see if installing different woofers would make a difference
and needing to deepen the box to accomidate a deeper woofer driver. by about 3 inches.... using an RCF L18P400 or a RCF L18X451 do you know or know someone that can help answer that and if modifications are needed what they would be...? Thanks |
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APC321
Young Croc Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 680 |
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Kyle makes a fair point about 2x 18", so I did some looking:
L'Acoustics SB28: 1300mm wide x 550mm high x 700mm deep. Court Black Box: 1100mm wide x 750mm high x 650mm deep. EAW BH882: 1511mm wide x 1066mm high x 910mm deep. EAW BH882 divided 1511mm wide x 533mm high x 910mm deep. into two (Emerald?) I think that the minimum dimension out of width, height and depth has a bearing on the "practical useability" of a box. ie. Getting through a standard width door, or perhaps going up steps of restricted width etc. So yes if the BH882 divided into two is used then it compares more favourably (533mm)with the L'acoustics SB28 (550mm - industry standard box)in terms of its minimum dimension. But power density is also an issue. ie. The Emerald has just one driver against the L'Acoustics that has two drivers in a 'similar' sized box. I can think of two examples of people that I know who previously used "big" boxes. 1) He originally used Hog scoops, but moved to Funktion One 2 x 18"s. Said this was a much easier van / truck pack 2) He had Funktion One 2 x 18"s along with infra-bass and matching infra horns. He sold the infra horns, as when they were loaded into his van there was hardly any room for anything else. |
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M4trix
Registered User Joined: 23 June 2009 Location: Croatia Status: Offline Points: 445 |
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Lemme put it very simple. If these cabinets don't blow a candle from at least 10 meters then it's a no go project !
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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You don't necessarily need power density when you have the benefits of horn loading. A Bertha is a very particular type of cabinet with a heritage in a particular type of music and venue though, I don't think anyone is really advocating touring a bunch of them for live music or similar.
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Laurin
Registered User Joined: 10 July 2006 Location: Germany Status: Offline Points: 182 |
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Ha!
Bertha too big and heavy. We are stacking a Void Incubus on a weekly basis. Practical is a Bertha not at all! It can not reach 20Hz without the Levan horn, and even then it will be more than -10 dB. The driver will not change how low it will play, that defines the horn not the driver. If you build a Bertha please keep in mind to build the rear chamber the right way. The parts between the throats are empty. Very small changes, change the sound drastically with horns! Free knowledge: Best drivers in a Bertha are not typical low QTS horn drivers but drivers with T/H more suited to BR. Will add a picture that shows how to build the rear chamber. Edited by Laurin - 05 November 2017 at 7:37am |
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http://www.event-corp.de
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Laurin
Registered User Joined: 10 July 2006 Location: Germany Status: Offline Points: 182 |
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Like always we think alike. |
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http://www.event-corp.de
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discomusic1978
New Member Joined: 30 October 2017 Location: Lancaster Ca Status: Offline Points: 8 |
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Thanks for the info I appreciate it.
I am just stuck on this box for a large venue I am a mobile dj coming out of retirement. looking to custom build all of my boxes Tops and bottoms. this way for small sized gigs I can use just the tops and medium sized gigs a set of tops and a set of front loaded double 18"s and for Large gigs 1 to 2 sets of tops and 1 to 2 sets of front loaded double 18's then for extra large gigs use all tops all front loaded double 18's and the added treat of a couple Bertha's with the Levan lenses. That is my vision but one thing I might do is split the Bertha's into 4 single 18 boxes with extension lenses for easier transporting my question has been if I put a newer style driver instead of A JBL 2240 or an RCF L18-851kn. and use a RCF L18-P400 or RCF LF18X451 or A BMS Neo Driver that is rated down to 25hz and a db rating of 95 having to deepen the back of the box and thicken the speaker baffle plate to allow for longer x-max but keeping the actual horn structure the same will it impede the sound making it better or worse in the low frequency range...?> the Efficiency is their being at either 95db or 98 need some technical input on this question what do I need to change on the Bertha box if anything at all Thanks Anthony |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 560 |
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The Bertha will only split into 2 single 18s? do you mean splitting a pair of berthas down into the 'Emerald' boxes? they are still a two-man box to move around.
Instead of making the box any deeper, you'd probably get away with making the rear-chamber come forward more and making the initial expansion shorter I assume that yours are the ones that Brad was building, Re-pro? Most of the sources of information I've found have pointed towards a pair of Emeralds having more output than the Bertha on its own which persists to confuse me unless it has something to do with the interaction of the two drivers within the horn... As for the drivers, I found that the horn was of such a low compression rate that it didn't seem to change output by any considerable amount as you simulated different drivers... |
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