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robotnation View Drop Down
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    Posted: 30 January 2006 at 2:23pm
i am currently building an X1 sub for use in a dj sound system, but i know thats not nearly enough for the genres i play (i do everything from trance to house and techno to dnb)  I dont need or want something that has a long throw (no horns) and i was wondering if any of you knew of plans for a speaker that played flat from 80 hz on up (preferably as high as possible, like a minimum of 175hz.)  I also am willing to invest in expensive drivers too, because id rather pay for an expensive sound system that can fit in my car over a sound system that id need to buy a new car to move around when i dj.  Anybody have plans theyd liek to suggest?  If none of you have plans then perhaps you have a speaker suggestion that i could feed into winISD to make my own housing?  my ultimate goal is to have a Midbass cabinet that would sound nice when about two are paired with one X1.
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Tom Umney View Drop Down
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Points: 4954 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom Umney Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 3:05pm

Well use a X1 crossed over at 80hz and run a pair of 15 inch reflex above that to 200hz and then mid/highs above that.

http://www.fane-acoustics.com/public_html/media/pdf_media/Ca binets15inch125L.pdf

Theres a 15 inch reflex design you can use above X1's.

 
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robotnation View Drop Down
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Points: 254 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robotnation Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 6:23pm

ok well im not gonna build that, but i am going to thank you anyway, becasue i liek that driver a lot (wouldnt have heard of it any other way) and you made me realize some very important things taht are, in the long run, going to be of great assistance to me.  I am going to use a driver made by fane, and i realized that though reflex boxes spike, if you crossover higher than the spike, you can get really flat SPL curves.  Ill be posting some simple reflex spl curves i got soon and you people can pick them apart (please do.)

I suppose ive been making this whole speaker thing harder than it was supposed to be...
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robotnation View Drop Down
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Points: 254 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robotnation Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 7:16pm
ahhhh i keep trying to calculate spl curves in winISD and it gives me this weird curve that slowly aproaches the normal spl of the speaker and then jsut stays tehre until it hits infinite hertz... does anyone know whats wrong with my software?
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robotnation View Drop Down
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Points: 254 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robotnation Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 8:00pm

alright hows this for a speaker housing? its totally flat +- .5 db off of 99db from 70hz to 350 hz.  Is that loud enought though?  Its one of the only 15 inch drivers that doesnt do the weird thing in winISD.  If any of you know what would perform better than this then id love to know.



Edited by robotnation - 30 January 2006 at 8:00pm
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Timber_MG View Drop Down
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Points: 1454 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Timber_MG Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 10:13pm
It(the roll-off) is Le dependant and that graph will only hold marginally true as with increasing frequency you also get increasing directivity (read up Baffle Step)
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Centauri View Drop Down
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Points: 1792 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Centauri Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2006 at 11:07pm
Originally posted by robotnation robotnation wrote:

ahhhh i keep trying to calculate spl curves in winISD and it gives me this weird curve that slowly aproaches the normal spl of the speaker and then jsut stays tehre until it hits infinite hertz... does anyone know whats wrong with my software?


Any of these simulators which use t/s parameters are low frequency response simulators only.  WinISD uses driver Le to attempt to predict high end, but this is nowhere near accurate as the actual driver response is not taken into account, and, as Martin pointed out, neither is directivity.  The drivers that show flat high end probably don't have the value of Le entered.

With your Kappa Pro 15 chart, if you check the maximum power and maximum spl charts. you will find this driver dissapointing.......

Cheers
Graeme


Edited by Centauri - 30 January 2006 at 11:08pm
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Tom Umney View Drop Down
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Points: 4954 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom Umney Quote  Post ReplyReply Direct Link To This Post Posted: 31 January 2006 at 10:10am

Yeah like most Eminence drivers are dissapointing.

@robotnation: You said you were going to use a driver by Fane, use the Colossus 15XB or 15B or Cresendo 15B and try modelling them. See which one gives the best results.

 
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Points: 254 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robotnation Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2006 at 6:23pm

alright why cant i get any good numbers... unless maybe i am and jsut dont know it.  I just got a curve liek this on the beyma 15 m300.  would this be substantial when crossed over at 80 and 300?  that spike i figured when most of the frequencies in the spike region where crossed over to the subs, it would actually form a slight bell curve that spikes at around 90, where the kick is (which it does.)  all i need to know now is where on earth i can find an m300 (noone sells them and beyma doesnt even mentiion it) and also whether or not 2-4 of these would be substantial for medium sized rooms and basements and stuff.

http://i10.photobucket.com/albums/a121/robotnation/beymamidb assspl.gif

PS that blue curve is another project im workign on, ignore it, or ask questions if you want



Edited by robotnation - 06 February 2006 at 6:31pm
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Centauri View Drop Down
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Points: 1792 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Centauri Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2006 at 7:19pm
That Photobucket link doesn't seem to work - you might not have the album set to share mode.

If you are looking at Beyma, try modelling the 15LX60 - it looks quite good.

Cheers
Graeme
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Points: 254 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robotnation Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2006 at 7:40pm

ok i fixed link
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robotnation View Drop Down
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http://i10.photobucket.com/albums/a121/robotnation/beymamidb assspl2.gif

ok here is the spl curve i posted before, but this time i tried something else and made another almost ientical box except with twice the volume and with 2 instead of 1 speakers.  All im wondering now is if taht better response fromt eh two speakers in one housing would be the exact some response as 2 different housings with 5 cu ft each instead of 1 with 10?  The other question i have to ask is... I have designed both boxes, but i need to know one thing... i can only fit 4 of the 1 driver boxes and 2 of the double driver boxes in my car, and all i want to know, is if i build one of thoe two options... Will it be of exceptional quality?  PLease... i dont want to sound harsh, but DONT tell me that what i need is  "a stack of 20 HD15s with a few xd32121 subs and this and taht and blaaaah blaaaahhh"  I just want to know, will building these speakers and using them give the most impressive sound i can get out of a system that fits in the back of a volvo?  If someone knows of a better driver for a reflex box that gets a better curve then i would love to know, and another thing, i have crappy modeling software that messes up on over half of the drivers i input, so theres a good chance i WONT be able to design another housing (in other words i would be very hapy if your driver selection came with a link to a nice reflex housing with a similar but better PRE-EQ spl curve.)  I dont mean to be harsh but i am sorta tired seeing people ask for help on DIY sites then jsut getting a buncha crazies talking about my reggae sound system is beter than yours and never REALLy answereing the questions blah blah blah.

If you help me even a bit i will be eternaly grateful to you

-matt-



Edited by robotnation - 07 February 2006 at 9:08pm
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