My first 18" ported box build |
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Glenn
Registered User Joined: 01 October 2008 Location: Australia Status: Offline Points: 197 |
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MarjanM,
You say he may have tuned the box too low and there is a lot of excursion above this frequency. Couldn't he also have tuned too high (like 60hz) and the sub bass is causing the excess excursion.
Lastly without looking at the eminence specs - maybe this drivers also has a short xmax.
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aperrado
Registered User Joined: 10 January 2008 Location: california Status: Offline Points: 315 |
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that is the point I dont know the t/s parameters are bcs this is a eminence oem speaker eminence dont want to give info on oem speakers and the company that made a cabinet dont tell me the specs too. the speaker in the company that made the cabinet sell this speaker for 350.00 UD.
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Im hard to learn but still asking
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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That is why he has to have a dsp and try a few different HP filter frequencies and be sure what is wrong.
If it is tuned too low cutting the very low frequencies will cure the thing. Can you check where that box is tuned? That will show you the problem also. |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Glenn
Registered User Joined: 01 October 2008 Location: Australia Status: Offline Points: 197 |
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You can get a rough idea by playing a test tones through them at various frequencies and feeling the excursion. I do this with winisd signal generator if nothing else aroung. Don't really have high end gear to test so I use my ears and what ever I can think of.
You would expect an 18" to be tuned around 40hz, so for a given power input expect a reduction in cone movement here compared to 30hz and 50hz. In the case of the cab referred to in this post, I would sweep from say 75 hz down to 25hz in 5hz increments. Try to find a frequency where cone movement is least compared to the frequency above and below
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Glenn
Registered User Joined: 01 October 2008 Location: Australia Status: Offline Points: 197 |
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Turn off any HP or LP filters.
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aperrado
Registered User Joined: 10 January 2008 Location: california Status: Offline Points: 315 |
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ok I will try it ty
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Im hard to learn but still asking
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edjay
Registered User Joined: 30 April 2009 Location: North Wales Status: Offline Points: 157 |
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Sorry, I've got no info to contribute but I'd like to see what happens. :)
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Every little helps
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aperrado
Registered User Joined: 10 January 2008 Location: california Status: Offline Points: 315 |
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lol np it is open forum we can search here and there and maybe we can learn what we need .
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Im hard to learn but still asking
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edjay
Registered User Joined: 30 April 2009 Location: North Wales Status: Offline Points: 157 |
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Every little helps
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chowlu
Registered User Joined: 13 September 2008 Location: Trinidad&Tobago Status: Offline Points: 78 |
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did you solve the problem yet?i would like to know how it turned out
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"adapt or die"
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aperrado
Registered User Joined: 10 January 2008 Location: california Status: Offline Points: 315 |
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ok sorry for no answer back I got out the crossover and installed a peavey kosmos now I dont need to much volume to get good seismic bass it sound very good the kosmos has a dial button for subwoofers and for the tops use kosmos effects
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Im hard to learn but still asking
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aperrado
Registered User Joined: 10 January 2008 Location: california Status: Offline Points: 315 |
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[QUOTE=aperrado]ok sorry for no answer back I got out the crossover and installed a peavey kosmos now I dont need to much volume to get good seismic bass it sound very good the kosmos has a dial button for subwoofers and for the tops use kosmos effects
Now I got the eminence speakers back to original cabinet next time going to buy a pair of peavey lowrider 18 for my b&c boxes when I complete it going to write here what happen.
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Im hard to learn but still asking
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