micb
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Posts posted by micb
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Cool.
It must be so nice to have good bass back. Since I stripped my Fi tunnel install down I have been missing bass big time.
So loud do you think the Tahoe it is now Steve?
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thanks...
i have no clue what you are trying to say other then that...
When you place a woofer directly on a baffle the air displaced by the cone and outer surround radiates all directions it can, air likes the most direct route so interuptions are bad, if you put a woofer straight onto a baffle the air flows over the basket/bounting ring and onto the baffle.
If you recess the woofer into the enclosure or add an additional panel ontop so the outer surround is flush with the baffle you improve air flow from the woofer to the baffle, SPL cars use this to gain a few 10ths of a db.
If you look at your current mounting will have air pressure moving down into the void between your woofers, if you filled that void then the pressure can only move upward in unison into the rest of the vehicle cabin.
It is not much extra output but every little counts.
It is not worth changing now it is all trimmed and only a small gain but something to consider in the future.
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Nice one Steve, the two tone wrap looks good.
May I ask why you did not add an addtional trim top to the enclosure as now your woofers are sitting prowd from the enclosure it is not optimal airflow from woofer surround to the baffle?
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Good work guys this looks to be once heavy basser.
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Good stuff Steve!
Shame the breaker could not take the parallel hockup.
Need to try that here off 230v AC
Thanks for the plug on the start up credits on the Vid http://www.stevemeadedesigns.com/board/public/style_emoticons/default/dirol.gif
Let me know if you do that as i'd like to see that in person.
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Great find Steve.
I have had alts explaned to me before but now I understand exactly how each part works.
Good vid.
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Intersting vid not seen many gas cooled systems.
UK monster last season did 177.1 so a fair bit to go for the nitro cooled one to catch up!
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nice not only does it have a duck but a ZX5 focus
Yep it is a Focus.
The system is 4 x JBL GT5 10's of 1200 WRMS in a 33hz tuned box.
SPL testing with/door window open (louder on the lows).
Peak=142.7dB @ 37Hz
40Hz=141.8dB
33Hz=142.5dB
25Hz=138.3dB
20Hz=138.7dB
So it plays quite flat!
Blocking the port to tune to 20hz makes it do 140db at 20hz.
http://s31.photobucket.com/albums/c358/Meg...nt=382f9a81.pbr
Loads of th UK guys have yellow ducks about so there may be more vids!
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A fellow bass head friend of mine made this Video.
I think you (esspecially Assman) will like it!
http://s31.photobucket.com/albums/c358/Meg...nt=ed363ddc.pbr
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Nice, did you try with passenger window closed so all the pressure is forced out the drivers window?
Also try a few test tones at 25-33hz. With your low tuning it should move a lot of air in this area.
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It was just designed that way,you got to remember back then there wasnt any talk of bandpass designs.Even tho now a days people will say its a bandpass.It did a 138 db in 1998 during a sound q comp with a audio control.My RTA was a 29 out of 40.
Nice!
Got to love those old JL's.
What did you have powering them?
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That looks great! I love the motorisation.
Did the front chamber act as a bandpass or was it just built that way?
I bet it sounded great.
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It is either:
1) A tensel lead is slapping against something (spider or cone ect) which very common.
2) Dustcap is vibrating againt the cone
3) Cone has come away from spider.
4) Coil is misalligned or damaged and scraping.
Touch the dust cap does it stop? You need to take the driver out and play it free air, watch the tinsel leads if they are not making the noise then it is likely a problem with the coil i.e recone/replacement time!
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It is a very nice install, looks great.
It playes nice and flat.
One of my highlights erlier this year was climbing into Mazdawg tunnel about 1/3rd way in to the tunnel manfold and mazdawg burping me at 21hz, 22hz and 23hz flat out. It was deffo high 150's mabye more and so very very gusty, that is the most air I have ever felt that low, it was like being in a hurricane.
Roll on the next install !
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L7 is more of a higher tuned subwoofer that gets loud tuned 35hz ect.
The Fi SSD 12 is low FS driver that has massive bottom end in comparison.
Having heard both i'd take a SSD any day of the week, I may be a bit bias as I am just finishing an cool install with 4 x SSD 12's.....
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Quick question Steve, how loud is that when you play demos for people? Mid 150's?
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Yes deffo seal that baby up.
The subs are not moving much at all, you can tell from the vent velocity that there system is only purring along.
Low amount of power right?
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I am redoing my system so decided to try some new subs.
Fi Audio SSD 12 - D2 x 4.
The build quality on these drivers seem great.
Suspension is stiff, loads stiffer than my current RE Audio SR's.
I've got my own custom box design which is a bit secret at the moment, there will be more details about this later.
I have 3KW and UK Street C competitors watch out!
There will be more pics as the build continues.
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That hit her like a wall of bass, proper surprise.
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Looks like some good bottom end, if you can stop that windows rattling/flexing it will be louder in the cabin on low bass.
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Nvidia released the 9series a few months ago, thats the latest card made by nvidia i havent heard anything about a GT260 or a GT280...
Info is starting to come out, a lot of people are under NDA (Non Disclosure Agreements). It looks to be G92 core, 512 bit memory + bus and 256 unified shader processers (double G80 i.e. 8800 series).
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Deffo Nvidia at the moment.
BTW the new super top end GT260 and GT280 (i.e. the next range of cards cards after the 8800GTX) is going to be releaced in then next 2-3 weeks.
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heres a video you should watch
in Member Videos - Host 'em & Post 'em! System Vids / Off Topic
Posted
You must try sealing that off so bass only flows into the cabin, it will be louder as you will be getting cancellation from the bass going into the trunk currently.
I gains 6db at 40hz when I sealed up, the null I was getting was that bad!