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| Re: Open back array [message #24008 is a reply to message #24007] |
Mon, 05 November 2007 14:01   |
tolits
Messages: 21
Registered: May 2009
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Chancellor |
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Yes , those are 8 pcs. Neo8 and 18 pcs 6.5 midbass per speaker..These are cheap midbass made here in the Philiipines at $5 each.It was supposed to be an upgrade to my previous array using 9 pcs of Focal 5K013l 5inch bassmid in a close back array. The closed back sounded better. I could not make it sound right even with a DCX x’over until I reduced the negative going signal to the midbass. The difference is night & day. The sound became natural ,coherent and,life like and very detailed and effortless. I suspected that the asymmetrical shape of the cone causes some distortion. I tried applying this sound processing which limits the negative going signal. I tried this before with the focals before but the effect is good but not that big. Maybe with the no. of the bassmid in an open back configuration made the effect even more pronounced. The difference now is so big that would make keep this speakers. I am also thinking of making an open back array using 8 pcs of 12 in woofers and apply the same sound processing.Thanks
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| Re: Open back array [message #24009 is a reply to message #24008] |
Mon, 05 November 2007 20:00 |
Tom R.
Messages: 51
Registered: May 2009
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Baron |
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Please elaborate on your explanation of reducing the “Negative going signal”.
I am not trying to be critical, I just don’t understand.I have a line array using 8 of the same focal drivers per side and am interested in what you are doing. I clicked on your link: What was your impression of the two vertical 6.5 driver array
with the Neo 8 in the middle? Did it reduce early wall reflections? Did it focus more
Sound at the listing position?
Tom
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| Re: Open back array [message #24010 is a reply to message #24009] |
Mon, 05 November 2007 23:14 |
tolits
Messages: 21
Registered: May 2009
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Chancellor |
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If you look at the shape of the side view of the cone, it looks like at triangle. On the negative going signal, it moves like a spear. On the other hand on the positive going signal, it has a higher drag because of the parachute effect of the cone. What I do is use a tube configured in such a way I can variably decrease the negative going signal . Regarding my impression with the two 6.5 driver with Neo8 at middle It takes the performance to a higher level than the focals but with the negative limiting signal in place.Distortion became lower,imaging became better, Naturalness also has been enhanced. I would not go back to the Focal arrays in a close back and the 8 Neo.To me,It is simply a different level considering the bassmid are very cheap.
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| Re: Open back array [message #24011 is a reply to message #24010] |
Tue, 06 November 2007 20:16 |
Tom R.
Messages: 51
Registered: May 2009
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Baron |
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What exactly did you do to the negitive portion of the signal / back wave to make the sound better? This was on a sealed enclosure or open baffle, just to clarify? Tom R
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| negative going signal [message #24014 is a reply to message #24010] |
Wed, 07 November 2007 08:52 |
lcholke
Messages: 73
Registered: May 2009
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Viscount |
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Hi Lito, Is the tube mounted behind the driver and stuffed with dampening material? Is the tube partly closed on the back end? If the tube that reduces the negative signal is acting as a rear enclosure, then the cone travel may be being limited, reducing the Doppler distortion. Is the bass reduced also.
Thanks
-Linc
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