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Plans for RCF dual 18"

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djteknovibe View Drop Down
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    Posted: 21 June 2016 at 7:16pm
Does anyone have any plans or know how to design a decent front baffle reflex loaded enclosure? I'm wanting to make a decent enclosure design for two RCF LF18X451 loaded dual 18" bass reflex. I want the enclosure to be such that the drivers perform so ideally if possible they'll be about -3db down at about 35hz. Here's the driver i'm wanting to use :

http://www.rcf.it/en_US/products/precision-transducers/low-frequency-transducers/lf18x451

I'm absolutely useless at designing enclosures so I thought i'd ask you guys seeing as a lot of you guys design and build your own enclosures.
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sn95 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2016 at 6:38pm
A 7ft /198l tune to 36 Hz deals the flattest response that I could get and will still take 1400 before hitting Xmax so 198l per driver .
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djteknovibe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2016 at 6:50pm
So a 198 litre enclosure tuned to 36hz would be ok, thanks, but how come the drivers would nly be able to take 1,400 watts each? They're rated at 1,800 watts rms continuous.
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sn95 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2016 at 7:02pm
At Xmax .you will need to add a little eq at 60 Hz .

Edited by sn95 - 22 June 2016 at 7:03pm
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djteknovibe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2016 at 7:09pm
Add a little? Not take a few db off? Ok thanks, how accurate is the software you use anyway? Plus how would I go about getting the enclosures made? obviously i'd need to add internal volume because of bracing, drivers and stuff right?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 12:26am
Add a little .I'm using WInisd pro .have you looked at the B&C 18tbx100 it looks good and a little smaller box and flatter response .
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djteknovibe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 9:28am
I'd rather use the RCF LF18X451 as it'll overall give me 4-5db more spl output in a dual 18" box than using the B&C 18TBX100. I have no idea how I actually go from here to getting the enclosures for the RCF drivers designed and made. How would I go around that? I know what I want thr enclosures to look like, I want rectangular slot ports, a black duraflex style paintwork finish, steel powder coated grille that's flush with the front of the enclosure. I want speakons on the back, steel or very hard plastic handles.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 12:22pm
How do you calculated that RCF will give you 4-5db more spl then tbx100?
They are more or less equal in sensitivity. 1200 to 1800W is aproximately 1.5db.
You might have more difference at 40hz but not above.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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djteknovibe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 1:27pm
I meant to say 3-4db extra spl output and also because i'll be using two drivers in each enclosure and that adds up to about 3db extra spl output in total.


Edited by djteknovibe - 23 June 2016 at 1:30pm
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Teunos View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Teunos Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 1:28pm
  1. Tbx is 1200W, RCF is 1800W. (Both AES rating)
  2. Rcf has 115mm voicecoil, Tbx has 100mm so most likely less power compression.
  3. Rcf has (34-15)/2=9.5 mm true xmax, 
    Tbx has (25-12)/2=6.5 mm true xmax.
More power, more linear displacement and less power compression.
Also, RCF has a higher BL/Re gives a stronger motor.

I'd take the RCF any day of the week over the B&C.
Best regards,
Teun.
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djteknovibe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 1:31pm
How do I go about getting these enclosures made?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2016 at 1:48pm
Originally posted by djteknovibe djteknovibe wrote:

How do I go about getting these enclosures made?
 
If you can't design and build it yourself, you'll need to pay someone to do it for you.
Maybe post in the Wanted fourm?
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