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1850’s cutting off below 50hz

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    Posted: 26 September 2005 at 9:14pm
I have noticed the 1850 design does not do much below 50hz, would it
be recomended for me to 'cut off' all lower frequencies?

Someone told me playing 20hz would damage the speakers, is this true?


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Mircea Bartic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2005 at 3:38am
yes it is, running 20 Hz in the 1850 will send the speaker straight to speaker heaven
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chips Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2005 at 6:41am
Originally posted by Nexus_3 Nexus_3 wrote:

yes it is, running 20 Hz in the 1850 will send the
speaker straight to speaker heaven


So the setting of 50hz is correct too, or is it safe to go any lower?

Even though I will be cutting off at 50hz, is it possible to get lower with
the 1850 by stacking up 6 or however many?

To rephase: What I dont understand is, I was told that you can go lower
than 50hz with the 1850 when you stack them, but if I have cut them off
at 50hz how the hell can it do that?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tendril Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2005 at 2:41pm
As far as I understand it, the lower end can be extended to 42hz with stacks of 4 or more. The 50hz cut off is for single cabs only.

Maybe someone more knowlegeable than me will come and explain it better.
Tendril

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Post Options Post Options   Thanks (0) Thanks(0)   Quote minaximal Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2005 at 3:37pm

you can lower the hp filter cutof to match the increased acoustic horn cutoff..

by increasing the stack numbers, the horn sees what looks to be a larger mouth for length ratio and more of a true horn, also minimally increases the theoretical pathlength to assist in loading larger wavelength frequencys.. but there is only so much you can push a 54hz horn and after something like 6-8 you will not got any extra loading lower down the freq range only higher "efficiency"

so yes a stack of four may well be pushed to 42hz.. but i'd rather have six to eight unless you dont push them too hard down low

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Post Options Post Options   Thanks (0) Thanks(0)   Quote roborg Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2005 at 4:15pm
you can produce quite alot of low output with only a few 1850's, 40hz can be pretty noticable but don't try to put the hi-pass at 40hz (unless you have a 1000dB/oct filter handy!) & feed it 1.5K per bin!  Its far better to put the hi-pass much higher, around 55hz+, 24dB & then you can really crank up the juice without overexcursion, whilst still getting low-extention,
  If you're not going to power them with much then a lower hi-pass is fine, do a quick hornresp plot (160cm single exponential, 40l rear chamber to see how the excursion goes up below the horns cut-off)
  I've been alot happier with my 1850's since i switched to pretty high x-overs. Not so good for dnb with less than 4 bins i've found.  I've tried 4 double 18's x'ed over into 4 1850's at 70hz & that really did what i dreamed the 1850's would do low-down.
 
cheers,
  Rob
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2006 at 2:49pm
if you wanna go lower have u considered using subs below???
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