A Debate on the many different aspects of sound
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Porting only reduces excursion close to the tuning frequency, so it won't help with excursion in the midrange frequencies, and the low bass that would damage it will be filtered out anyways. As Dukk stated you have phase problems, but if a speaker system is tuned to say 45 hz, at 100hz and up, it will act exactly like it would in a sealed box.
500 Watt CAFz'r
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I imagine it would, but down at 60Hz it would have more output, with less excursion, right?
Even with a steep slope on the high pass, I see a lot of excursion on the mids when heavy bass songs are played, unless I dial the x-over up to a point where it doesn't sound as good. Maybe I'll take the time and whip a couple of test boxes together before I decide. Gonna need at least one anyway to measure the T/S.
And what if I dial in a bit of a peak around 60 or 70. A few extra dB's there might help those 6's keep up to a pair of 12's with a kilowatt.
Or they might pfluck like crazy....have to try.
Even with a steep slope on the high pass, I see a lot of excursion on the mids when heavy bass songs are played, unless I dial the x-over up to a point where it doesn't sound as good. Maybe I'll take the time and whip a couple of test boxes together before I decide. Gonna need at least one anyway to measure the T/S.
And what if I dial in a bit of a peak around 60 or 70. A few extra dB's there might help those 6's keep up to a pair of 12's with a kilowatt.
Or they might pfluck like crazy....have to try.
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dwvw, why would you tune a speaker to 45hz and then cross it over at 100? like dukk said, there is a possibility of phase issues, but phase issues are possible in vented subwoofer boxes as well. i did make 1 mistake though, the engineer i talked to about the venting was tinal from avi, not howard doctor, but i have talked to howard on many occasions regarding this, in fact he desinged the vented boxes for the f#1 4" i have right now, oddly enough he thinks that venting midranges is a good idea so long as the boxes arent too small and you force it and so long as the vent isnt to long. every component set on my avi/f#1 board is ported and the difference from sealed to vented was quite substantial, if i get a chance i will take measurements from 10' away centered, 1 will test 40,50,60 hz both sealed and vented, every box is .6 cubic ft. i will post the resluts when im done
2000 Watt CAFz'r
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Originally posted by Car Trek:
And holy **** what's with all the animosity on here? Don't you guys have wives to bicker with?
And holy **** what's with all the animosity on here? Don't you guys have wives to bicker with?
[ February 21, 2005, 11:52 AM: Message edited by: Tim Baillie. ]
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That's twice Dave.
What I would find interesting is if you actually answered the questions asked rather than trying to drop names and simply restating that it sounds good to you.
That's if you actually have answers. I have to assume you don't... [img]graemlins/dunno.gif[/img]
What I would find interesting is if you actually answered the questions asked rather than trying to drop names and simply restating that it sounds good to you.
That's if you actually have answers. I have to assume you don't... [img]graemlins/dunno.gif[/img]
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i must have missed your question what actually was it, and whats "thats twice" mean [img]graemlins/dunno.gif[/img] 
. i thought that the opinions of those smarter than 2 of you and i put together would perhaps allow you to maybe even explore the possiblity of something that you dismiss as worthless as actaually being a possibility but you even dismiss what engineers have to say [img]graemlins/freak.gif[/img] .
[ February 21, 2005, 01:11 PM: Message edited by: defro13 ]
. i thought that the opinions of those smarter than 2 of you and i put together would perhaps allow you to maybe even explore the possiblity of something that you dismiss as worthless as actaually being a possibility but you even dismiss what engineers have to say [img]graemlins/freak.gif[/img] .[ February 21, 2005, 01:11 PM: Message edited by: defro13 ]
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^ Hey Dave, what do you think I do during the week. My education and background is IN Mechanical Engineering.. It may not be specifically in speaker design but physics is physics is physics and I have taken my share. Is my opinion justified now? Do I care?
Plus, you don't need a degree to hear.
I can hear that a 6.5" midbass in a proper vented enclosure has stronger sub 60hz bass response than the same midbass in a proper sealed enclosure.
Once a woofer is added it is harder, and if the system is performing as designed it should be impossible, to hear that low end response as the woofer covers it. And just because the woofer is now covering the bottom octaves does not mean it does not sound like the bass isn't coming from that midbass driver. This is the premise behind every single home theatre sub/satellite system.
To quote me:
You say I dismiss everything yet I am the one asking the questions...
Plus, you don't need a degree to hear.
I can hear that a 6.5" midbass in a proper vented enclosure has stronger sub 60hz bass response than the same midbass in a proper sealed enclosure.
Once a woofer is added it is harder, and if the system is performing as designed it should be impossible, to hear that low end response as the woofer covers it. And just because the woofer is now covering the bottom octaves does not mean it does not sound like the bass isn't coming from that midbass driver. This is the premise behind every single home theatre sub/satellite system.
To quote me:
What are you tuning these enclosures to?
What purpose are you trying to achieve?
How did that vent shooting at your hip bolster your front image?
My immediate reasoning for a vented door would be to bolster lower frequency response. But you run a front "woofer" as well that you laud the effects of so either that isn't the reason or it did not work for ****?
What purpose are you trying to achieve?
How did that vent shooting at your hip bolster your front image?
My immediate reasoning for a vented door would be to bolster lower frequency response. But you run a front "woofer" as well that you laud the effects of so either that isn't the reason or it did not work for ****?
**
