posted
ok i know there are jokes and hoax about bandpass boxes in crx , but really i know guys who have actually tried them. not keeping them for those who actually built one was because of space you took up, couldnt really have any toher items in the car like exra batteries if in upper classes . or fitting your amps in and also pain in the butt during inspection .
let get some feed back on this
-------------------- ear drums are very over rated
r.i.p. greg welch
2005 dbdrags bassrace world finalist 120-129.9 3rd place finish Posts: 1279 | From: somewere in time | Registered: Nov 2001
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posted
because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
Posts: 76 | From: CA | Registered: Nov 2007
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quote:Originally posted by Cuseikan: because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
How is that easy way out? If you build a race car and have the option to use a v8 motor would you go use a 4 cylinder motor instead and then complain about it? Crx's people use for spl competition not for bass race. I guess to each their own.
Posts: 1770 | From: elgin | Registered: Jan 2003
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quote:Originally posted by Cuseikan: because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
How is that easy way out? If you build a race car and have the option to use a v8 motor would you go use a 4 cylinder motor instead and then complain about it? Crx's people use for spl competition not for bass race. I guess to each their own.
I would rather use a 4cylinder because they are naturally lighter and respond to HP gains better then a heavy v8.
And getting loud at 55+hz is the easy way out for spl vehicles. All you have to do is look at most crx competitors box and see that they have a small box with small subs, a massive external areo, and alot of power. I understand it is difficult to control small subs with massive amounts of power. But that seems to be the most difficult part about building a crx that does 150db+ at 55+hz. Also you may argue the fact that that freq is the resonant freq of the crx. Once again that's the easy way out tuning to the cars resonant freq. It's a smart way to get loud, and it is also the easier way to get loud.
I have seen dozens of crx's doing 150+ at 55hz+, but I have yet to see one do it at 30hz. I know you can always just buy another vehicle more suited for getting loud at lower freq. But that's not really the point. How come no one has stepped up to the challenge to build a bass racer crx? The answer is because it is too hard, and it is easier to build a spl vehicle.
posted
^^^^Actually Eric Hoffman aka Team Neo Eric has bassraced his crx with 2 10's in it off of a American Bass 500.1 and almost done a 149.9 That's a pretty decent feet since his box is tuned high and he didn't use an extremely high tuned song to bassrace with. I would bet that if he hit his start right on he could have been the first person ever to do a 149.9 out of a pair of 10's. That's pretty impressive if you ask me.
-------------------- TEAM SUNDOWN AUDIO 2009 NSPL Car 1801-3600 Watt Record Holder: 151.2db 2009 NSPL Car 3601-Up Watt Record Holder: 152.6db 2009 NSPL Car Hardcore Record Holder: 155.2db 2009 NSPL Car 3601-UP, Car Hardcore, and Car Points World Champion Posts: 1854 | From: The Triad | Registered: Jan 2008
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posted
my crx is tuned quite low at 38 hzt i do a decent 153.7 dbs with extra batteries @ 16 volts i can do a 158.6 db . so sorta saying if was raise my freq i would gain in spl ,
-------------------- ear drums are very over rated
r.i.p. greg welch
2005 dbdrags bassrace world finalist 120-129.9 3rd place finish Posts: 1279 | From: somewere in time | Registered: Nov 2001
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quote:Originally posted by Nightshade: ^^^^Actually Eric Hoffman aka Team Neo Eric has bassraced his crx with 2 10's in it off of a American Bass 500.1 and almost done a 149.9 That's a pretty decent feet since his box is tuned high and he didn't use an extremely high tuned song to bassrace with. I would bet that if he hit his start right on he could have been the first person ever to do a 149.9 out of a pair of 10's. That's pretty impressive if you ask me.
Hats off too him. Pretty damn impressive for 2 10" to take the abuse of bass race like that.
quote:Originally posted by audiobuffru1: my crx is tuned quite low at 38 hzt i do a decent 153.7 dbs with extra batteries @ 16 volts i can do a 158.6 db . so sorta saying if was raise my freq i would gain in spl ,
Great score man!!! But your saying it would be more easy to get louder at a higher freq?
Posts: 76 | From: CA | Registered: Nov 2007
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quote:Originally posted by Cuseikan: because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
How is that easy way out? If you build a race car and have the option to use a v8 motor would you go use a 4 cylinder motor instead and then complain about it? Crx's people use for spl competition not for bass race. I guess to each their own.
I would rather use a 4cylinder because they are naturally lighter and respond to HP gains better then a heavy v8.
And getting loud at 55+hz is the easy way out for spl vehicles. All you have to do is look at most crx competitors box and see that they have a small box with small subs, a massive external areo, and alot of power. I understand it is difficult to control small subs with massive amounts of power. But that seems to be the most difficult part about building a crx that does 150db+ at 55+hz. Also you may argue the fact that that freq is the resonant freq of the crx. Once again that's the easy way out tuning to the cars resonant freq. It's a smart way to get loud, and it is also the easier way to get loud.
I have seen dozens of crx's doing 150+ at 55hz+, but I have yet to see one do it at 30hz. I know you can always just buy another vehicle more suited for getting loud at lower freq. But that's not really the point. How come no one has stepped up to the challenge to build a bass racer crx? The answer is because it is too hard, and it is easier to build a spl vehicle.
The easy way out^^^
It is quite simple why you dont see any crx's doing a 150 at 30 hz. It takes a large enclosure to get loud at that low of a frequency. A crx does not have the room to accomodate a large enclosure and the extra batteries and amps that it would take to make it happen.
A large enough enclosure with enough port area and you can ground pound the snot out of a rex. It would just be a pain fitting it all in and being able to drive it.
-------------------- "TECMO BOWL CHAMPION" Posts: 1366 | From: The Recession | Registered: Dec 2007
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quote:Originally posted by Cuseikan: because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
How is that easy way out? If you build a race car and have the option to use a v8 motor would you go use a 4 cylinder motor instead and then complain about it? Crx's people use for spl competition not for bass race. I guess to each their own.
I would rather use a 4cylinder because they are naturally lighter and respond to HP gains better then a heavy v8.
And getting loud at 55+hz is the easy way out for spl vehicles. All you have to do is look at most crx competitors box and see that they have a small box with small subs, a massive external areo, and alot of power. I understand it is difficult to control small subs with massive amounts of power. But that seems to be the most difficult part about building a crx that does 150db+ at 55+hz. Also you may argue the fact that that freq is the resonant freq of the crx. Once again that's the easy way out tuning to the cars resonant freq. It's a smart way to get loud, and it is also the easier way to get loud.
I have seen dozens of crx's doing 150+ at 55hz+, but I have yet to see one do it at 30hz. I know you can always just buy another vehicle more suited for getting loud at lower freq. But that's not really the point. How come no one has stepped up to the challenge to build a bass racer crx? The answer is because it is too hard, and it is easier to build a spl vehicle.
The easy way out^^^
It is quite simple why you dont see any crx's doing a 150 at 30 hz. It takes a large enclosure to get loud at that low of a frequency. A crx does not have the room to accomodate a large enclosure and the extra batteries and amps that it would take to make it happen.
A large enough enclosure with enough port area and you can ground pound the snot out of a rex. It would just be a pain fitting it all in and being able to drive it.
I guess your right. Kinda sad that no one has at least tried it. =[
Posts: 76 | From: CA | Registered: Nov 2007
| IP: Logged |
quote:Originally posted by Cuseikan: because for some reason people like taking the easy way out on crx's and getting loud it 55+hz.
How is that easy way out? If you build a race car and have the option to use a v8 motor would you go use a 4 cylinder motor instead and then complain about it? Crx's people use for spl competition not for bass race. I guess to each their own.
I would rather use a 4cylinder because they are naturally lighter and respond to HP gains better then a heavy v8.
And getting loud at 55+hz is the easy way out for spl vehicles. All you have to do is look at most crx competitors box and see that they have a small box with small subs, a massive external areo, and alot of power. I understand it is difficult to control small subs with massive amounts of power. But that seems to be the most difficult part about building a crx that does 150db+ at 55+hz. Also you may argue the fact that that freq is the resonant freq of the crx. Once again that's the easy way out tuning to the cars resonant freq. It's a smart way to get loud, and it is also the easier way to get loud.
I have seen dozens of crx's doing 150+ at 55hz+, but I have yet to see one do it at 30hz. I know you can always just buy another vehicle more suited for getting loud at lower freq. But that's not really the point. How come no one has stepped up to the challenge to build a bass racer crx? The answer is because it is too hard, and it is easier to build a spl vehicle.
The easy way out^^^
It is quite simple why you dont see any crx's doing a 150 at 30 hz. It takes a large enclosure to get loud at that low of a frequency. A crx does not have the room to accomodate a large enclosure and the extra batteries and amps that it would take to make it happen.
A large enough enclosure with enough port area and you can ground pound the snot out of a rex. It would just be a pain fitting it all in and being able to drive it.
I guess your right. Kinda sad that no one has at least tried it. =[
Well besides me.
I have given it some thought. If I had the equipment I would try 8-8's tuned in the 32-35hz range. That would be pretty interesting.
-------------------- "TECMO BOWL CHAMPION" Posts: 1366 | From: The Recession | Registered: Dec 2007
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posted
hm i measured this evening i have enough room so far for a 4th order bandpass and i also have the room for the 6th order bandpass , with todays amp such sd120000 or even dual sd8000's and stetson14k along with catus 14k amp at 12 volts and even at 16 volts should have enough power for what it takes at low freq.
-------------------- ear drums are very over rated
r.i.p. greg welch
2005 dbdrags bassrace world finalist 120-129.9 3rd place finish Posts: 1279 | From: somewere in time | Registered: Nov 2001
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posted
Big heavy V8's respond quite well to simple add ons. For example Car Craft took a boneyard Pontiac 455. The smog era motor put out 250HP and 450lb/ft. torque. With a cam, intake, headers, and carb it was deep into the 400 HP range. With aluminum cylinder heads it was producing over 500 HP and 500Lb/ft torque under 5500 rpm. The same style engine with a cam ground for turbos, and twin turbos layed down 900 HP to the wheels blowing through a single carb and no intercooler. I was able to do a 152.9@48Hz with 4K watts in my rex. That was 2 10's and 2 AB 200.1's on one PCA-2150. My best bass race score was a 149.7 but it was a losing score so it doesnt show. That was done with 2 VFL 10's and 2 500.1's on one G-2700 and a 300Amp alternator.
posted
well with my subs being old as they are dual 2 parreled should yeild a .5 ohm load , broken in sorta say i now reside at .8 ohm .oops looks likes new L7 will end being louder ,do to new suspension tight and fresh,
-------------------- ear drums are very over rated
r.i.p. greg welch
2005 dbdrags bassrace world finalist 120-129.9 3rd place finish Posts: 1279 | From: somewere in time | Registered: Nov 2001
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posted
I believe a CRX can do 150Db's or more at 30Hz but not with street class rules. Maybe 2 15's in a pretty big box, a couple of extra batteries, car running, and some decent power it could be done. The reason we are loud at 50-60Hz is that we are trying to get loud under some pretty tight constraints so we have to take advantage of things like higher notes and playing the resonant frequency of the car. Please read the Street A/B/C rules then go build for yourself and see how easy it is to even break a 150@50-60Hz.
Posts: 510 | From: streetsboro,oh | Registered: Jun 2005
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posted
been working on design for crx problem being is it takes every bit of the rear cargo ,2 people could lit box in and out you would have to be very creative on amps and all the wiring 4th order is possible 2 cft for sealed box and 7.75 cft front chamber port opening to start with 14.25 front baffle wall will be 4 inch thick this is the starting box isexternally 31.5 widex42 long 15 inches tall .dd subs would do nicely due to they love small sealed boxes .sub firing forward and close passenger side as possible so far this the design
-------------------- ear drums are very over rated
r.i.p. greg welch
2005 dbdrags bassrace world finalist 120-129.9 3rd place finish Posts: 1279 | From: somewere in time | Registered: Nov 2001
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