Best Comp's For Buck?
12-14-2005, 03:47 AM
#41
0 Watt CAFz'r
Thread Starter
Join Date: Dec 2005
Posts: 24
the years 93=97 are the same, mine is the 93, with the KLZE, jap headights/taillights on the way, converted jap ditital slimate control, more **** like that, watste of money better desbribes its situation, im 17, netting a liittle over 600 a week, every penny gets thown at that car until june, i mean EVERY single penny.
[ December 14, 2005, 04:51 AM: Message edited by: Bryan Sharman ]
[ December 14, 2005, 04:51 AM: Message edited by: Bryan Sharman ]
12-14-2005, 07:55 AM
#43
500 Watt CAFz'r
Join Date: Oct 2004
Posts: 870
The cap will pass frequencies above the crossover point, which is determined by the speaker's impedance.
A 12 dB crossover has a coil in parallel with the tweeter, to steepen the slope.
Say you have an 8uF cap, and a .26mH coil, designed to cross a 4 ohm tweeter at 3.5kHz.
Change the tweet to 8 ohms, and the cap will now pass everything above 1.8k, but the coil will short out everything below 7k.
The impedance between those frequencies will be the DC resistance of the coil (.2 to .4 ohms) in parallel with the 8 ohm tweeter....or nearly a dead short.....That coils's going to get hot if the amp doesn't go into protect first.
A 12 dB crossover has a coil in parallel with the tweeter, to steepen the slope.
Say you have an 8uF cap, and a .26mH coil, designed to cross a 4 ohm tweeter at 3.5kHz.
Change the tweet to 8 ohms, and the cap will now pass everything above 1.8k, but the coil will short out everything below 7k.
The impedance between those frequencies will be the DC resistance of the coil (.2 to .4 ohms) in parallel with the 8 ohm tweeter....or nearly a dead short.....That coils's going to get hot if the amp doesn't go into protect first.
12-14-2005, 08:04 AM
#44
500 Watt CAFz'r
Join Date: Oct 2004
Posts: 870
600 a week at 17 [img]graemlins/thumb.gif[/img]
There's lot's of comp's that sound good in that price range, and they all have a different "flavour".
I like the ID's myself, but you'll need to suit your own taste, so listen to lots. There is no best....only best for you.
There's lot's of comp's that sound good in that price range, and they all have a different "flavour".
I like the ID's myself, but you'll need to suit your own taste, so listen to lots. There is no best....only best for you.
12-14-2005, 10:47 AM
#45
1000 Watt CAFz'r
Join Date: Aug 2001
Posts: 1,770
Originally posted by Starterwiz:
The impedance between those frequencies will be the DC resistance of the coil (.2 to .4 ohms) in parallel with the 8 ohm tweeter....or nearly a dead short.....That coils's going to get hot if the amp doesn't go into protect first.
The impedance between those frequencies will be the DC resistance of the coil (.2 to .4 ohms) in parallel with the 8 ohm tweeter....or nearly a dead short.....That coils's going to get hot if the amp doesn't go into protect first.
p.s. your theory i don't buy it
been doing it for over 20 years and have yet to see it
12-14-2005, 01:40 PM
#46
Guest
Posts: n/a
An 8ohm speaker on a crossover intended for a 4ohm speaker will result a crossover point one octave below the intended point...
I have seen passives melt and amps shut off when the tweeter blows/is removed from the circuit. That's totally open on the high pass side though..
12-14-2005, 06:14 PM
#47
1000 Watt CAFz'r
Join Date: Aug 2001
Posts: 1,770
the first component in the line is a capacitor
it is electrically isolated from the coil
the only way i could see this is if that cap is fried
if your running a higher voltage to a cap than its rated for what happens?
i only sell 100 volt caps for that very reason
it is electrically isolated from the coil
the only way i could see this is if that cap is fried
if your running a higher voltage to a cap than its rated for what happens?
i only sell 100 volt caps for that very reason
12-14-2005, 09:19 PM
#48
500 Watt CAFz'r
Join Date: Oct 2004
Posts: 870
Cap's coils, and resistors together form a tuned circuit....change one value and the whole thing goes out of whack.
Impedance is different than pure resistance, and OK....the math is not really that simple....quadratic equations are fun.
That cap that's first in line will pass everything but DC if there's no resistance on the other side....look it up.....or keep doing it blind, like you've been doing for 20 years.
http://www.passivecrossovers.com/
http://www.termpro.com/articles/xover2.html
Impedance
As mentioned, the value of the inductor or capacitor determines the filter's cutoff frequency. Speaker impedance comes into play, however, since an inductor or capacitor will produce different cutoffs for any given impedance. Specifically, the cutoff produced by an inductor increases as impedance rises, while that produced by a capacitor decreases under the same conditions. (See Tables 1 through 4.)
http://www.bcae1.com/passxovr.htm
Try the demo that shows how the crossover point lowers with a higher impedance on this page.
Ok...here it is
http://www.bcae1.com/xoorder.htm
--------------------------------------------------------------------------------
Open Crossover Output Warning
You may damage your amplifier if you drive a second (or higher) order crossover when the speaker's voice coil is open (the speaker is blown) or if no speaker is connected to the crossover's output. When the speaker is removed (or the voice coil opens), the circuit becomes a resonant circuit. This circuit will, at the crossover frequency (or some multiple of the crossover frequency), present a 0 ohm load to the amplifier. The actual resistance will be only the resistance in the speaker wire and the inductor. Any time that there is audio at the resonant frequency, the amplifier will be stressed the same as if the speaker wires were shorted together. This will drive some amplifiers into protection. Others will blow a fuse or die a horrible painful death. The following graph shows how the impedance of the normal circuit (violet line) never drops below 4 ohms (the speaker's impedance). It also shows how the impedance of the circuit without a speaker (yellow line) drops to 0 ohms at the crossover frequency (for a 2nd order crossover, the resonant frequency is the same as the crossover frequency
Read em and weep.
[ December 14, 2005, 11:17 PM: Message edited by: Starterwiz ]
Impedance is different than pure resistance, and OK....the math is not really that simple....quadratic equations are fun.
That cap that's first in line will pass everything but DC if there's no resistance on the other side....look it up.....or keep doing it blind, like you've been doing for 20 years.
http://www.passivecrossovers.com/
http://www.termpro.com/articles/xover2.html
Impedance
As mentioned, the value of the inductor or capacitor determines the filter's cutoff frequency. Speaker impedance comes into play, however, since an inductor or capacitor will produce different cutoffs for any given impedance. Specifically, the cutoff produced by an inductor increases as impedance rises, while that produced by a capacitor decreases under the same conditions. (See Tables 1 through 4.)
http://www.bcae1.com/passxovr.htm
Try the demo that shows how the crossover point lowers with a higher impedance on this page.
Ok...here it is
http://www.bcae1.com/xoorder.htm
--------------------------------------------------------------------------------
Open Crossover Output Warning
You may damage your amplifier if you drive a second (or higher) order crossover when the speaker's voice coil is open (the speaker is blown) or if no speaker is connected to the crossover's output. When the speaker is removed (or the voice coil opens), the circuit becomes a resonant circuit. This circuit will, at the crossover frequency (or some multiple of the crossover frequency), present a 0 ohm load to the amplifier. The actual resistance will be only the resistance in the speaker wire and the inductor. Any time that there is audio at the resonant frequency, the amplifier will be stressed the same as if the speaker wires were shorted together. This will drive some amplifiers into protection. Others will blow a fuse or die a horrible painful death. The following graph shows how the impedance of the normal circuit (violet line) never drops below 4 ohms (the speaker's impedance). It also shows how the impedance of the circuit without a speaker (yellow line) drops to 0 ohms at the crossover frequency (for a 2nd order crossover, the resonant frequency is the same as the crossover frequency
Read em and weep.
[ December 14, 2005, 11:17 PM: Message edited by: Starterwiz ]
12-14-2005, 11:51 PM
#49
500 Watt CAFz'r
Join Date: Oct 2004
Posts: 870
Sorry to hijack your thread Bryan, but there's enough info there to make you think about whether you want to do your own passives, or buy a set that's already been engineered by people that actually know what they're doing (unfortunately, they didn't engineer it with your car/install in mind, so it's still a crap shoot).
Or better yet, go totally active, avoid all this gobbledy goop, and tune it how you like it.
Or better yet, go totally active, avoid all this gobbledy goop, and tune it how you like it.
12-15-2005, 10:48 AM
#50
1000 Watt CAFz'r
Join Date: May 2002
Posts: 1,649
At $600, also look at DLS, Pioneer, Alpine, Macrom. I still think best bang for the buck rite now is DLS, but I'm bias 
The performance spoke for itself as they did really well this year at world finals in both north american and in european events. And in the internation sound quality event held in the USA, they took 3 of the top five places. Not too shab !!
I'd steer away from building your own set given the quality that's out there in the sets now available at this price. I'd only build something like that if I couldn't find what I wanted that fit a very specific goal/plan I had for my vehicle. [img]graemlins/thumb.gif[/img]
The performance spoke for itself as they did really well this year at world finals in both north american and in european events. And in the internation sound quality event held in the USA, they took 3 of the top five places. Not too shab !!I'd steer away from building your own set given the quality that's out there in the sets now available at this price. I'd only build something like that if I couldn't find what I wanted that fit a very specific goal/plan I had for my vehicle. [img]graemlins/thumb.gif[/img]
