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Plans for RCF dual 18"
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2016 at 3:09pm
So you're jumping to conclusions? *rolls eyes*. I never said I don't wanna learn how to use design software I am trying so gimme a break. I never said I don't wanna learn carpentry either so stop putting words in my mouth mate. I said i'm useless at carpentry.

What's my age and job got to do with me wanting two dual 18" subs? I know a bit about sound systems like what power comrpession is, what RMS actually is (voltage not watts like people think), I know quite a bit but not a hell of a lot, if that makes any sense.
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rish View Drop Down
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Points: 547 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rish Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2016 at 3:22pm
Originally posted by cookie-dj cookie-dj wrote:

 
Sorry cookie-dj, I just had to repost your pic...... after reading this tread.
 
Rish
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2016 at 4:05pm
Rish, if you haven't got anything to add apart from that stupid f**ing picture then don't bother.

Edited by djteknovibe - 27 June 2016 at 4:07pm
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2016 at 11:40pm
Ok so today I had some time to play around with x451 some more and came up with the following box modeled after the Gsub but a little bigger 16.398 or 464.33 L tune to 33hz .The outside is 1220x610x711 using 24mm ply and the will be 562x 175x505 and a port velocity of 23.5 m/s . It can take 3k at Xmax and will produce 127.7 /30hz and from 40to 100 / 132Dbs .also don't take to hard it's just a joke.
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 27 June 2016 at 11:57pm
http://www.diyaudio.com/forums/attachments/subwoofers/555769d1466426396-keystone-sub-using-18-15-12-inch-speakers-18x451.png You may want to look at this.
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 8:21am
A joke is one thing but purposely spamming the thread is annoying, I can't look at that DIY forum i'm not a member and all I get is a log in page come up. Thanks for the help with the G Sub design, the port velocity is extremely high isn't it've been reading about port velocity and i've read anything above 0.10 causes port noise.
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 11:43am
The port velocity I'm getting is 23m/s at 3k.but the port can be made big to lower the velocity. By go to a 200mm it go down to 20m/s .
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 1:55pm
But 20m/s is still a hell of a loud port noise. When I was using the original G Sub plans as a design the port velocity I got down to 0.16.
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 2:05pm
What was your Watt input?
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 4:10pm
I can't remember if it was 1 watt or 3,600 watts because that's the combined power of two RCF LF18X451 drivers and in WinISD I did select two drivers so...
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djteknovibe View Drop Down
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Points: 97 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djteknovibe Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 4:14pm
Just checked WinISD just now and yeah it was at 3,600 watts and the port velocity is 0.16 it says.

Edited by djteknovibe - 28 June 2016 at 4:14pm
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 4:58pm
Just for comparison I input the Gsub port and 3k it's at 42m/s so either I'm putting some input wrong are you are .I will recheck my input .
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