So I Called Jl...

[Flipx99 5,000+ posts]

I run the Rainbow Cal27s. The manufacturer's crossover setting is 2.2k. I run them a 3.15 and they sound much much better.

Like JimJ said, listen with your ears, not with your eyes on the spec sheet.

I'd never be worried about crossing too high, only too low. If you cross too low, there is potential to damage the tweeter.

 

[Flipx99 5,000+ posts]

My midbass play 63 - 2.5k...

I have nussing 2.5-3.15 except shallow slopes.

 

[bikinpunk 10+ year member]

That picture was done with only x-over & t/a. I have eq'd since.

Also, that was with the mic facing forward to show the difference in response when facing the mic in the L/R ear direction vs. straight forward. Take a look at that spot you circled. It's not completely obvious that there's a x-over problem there. In actuality it's more likely mic placement. Check out this picture with the same side evaluated, changing only the direction of the mic:

http://i18.photobucket.com/albums/b138/bikinpunk/rta/LeftSideear.jpg

While I completely understand what you're saying, truthfully there's no since in arguing with me because I've tried alot of other x-over points and am satisfied with things the way they are now (aka: hard-headed), lol. You know as well as anyone that things are crazy in the car environment. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Johnny Drama 5,000+ posts]

That picture was done with only x-over & t/a. I have eq'd since.
Also, that was with the mic facing forward to show the difference in response when facing the mic in the L/R ear direction vs. straight forward. Take a look at that spot you circled. It's not completely obvious that there's a x-over problem there. In actuality it's more likely mic placement. Check out this picture with the same side evaluated, changing only the direction of the mic:

http://i18.photobucket.com/albums/b138/bikinpunk/rta/LeftSideear.jpg

While I completely understand what you're saying, truthfully there's no since in arguing with me because I've tried alot of other x-over points and am satisfied with things the way they are now (aka: hard-headed), lol. You know as well as anyone that things are crazy in the car environment. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

I also know now that I no longer rely on a mic to tune my car //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

The only time would be for judging and they face the mic forward.

You see, your ears arent directional like a microphone is. No matter what the manufacture states (omni-directional my ***). You are judged by ear not my mic. The shape of your ear alone precieves how you hear things. These type things a mic can not pick up. I was simply pointing out that for SQ judging witht he mic facing forward how it would be, you would want to retune so you dont lose points.

However you have your vehicle setup I cant not comment. If it sounds good to you that is all that should matter. Turning the mic wont help you though. Mic forward for RTA judging and your ears for everything else.

best bet...do what I do. Find the cars that the judges like the most and go sit in them //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif never hurts to hear what the judges like to hear //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[DejaWiz 5,000+ posts]

Were they able to tell you what the Fs of each tweeter is? And if they say 4.8 kHz, you could very well get away with a much lower frequency when using a tighter crossover slope since most manufacturers give their rating with a -12 dB/Oct slope.

The Memphis 16-XO3 has -18 dB/Oct slopes for the band and high passes, so I would venture to say you could set it somewhere between 3.6 to 4.0 kHz and be just fine.

 

[goodstuff 10+ year member]

Were they able to tell you what the Fs of each tweeter is?

I didn't ask. I know Fs is a spec, but what is it used for, how do I apply it?

 

[Flipx99 5,000+ posts]

Some say double the Fs is the lowest Xover point.

 

[DejaWiz 5,000+ posts]

I didn't ask. I know Fs is a spec, but what is it used for, how do I apply it?

For a tweeter, you can generally (rule of thumb), take the Fs (resonant) frequency and double it when using a -12 dB/Oct slope. If using a tighter slope, you can go even lower.

Example: If a tweeter has an Fs of 1150 Hz, then you should safely be able to use a -12 dB/Oct slope set to 2300 Hz.

 

[goodstuff 10+ year member]

Some say double the Fs is the lowest Xover point.

So I don't really need to know the Fs then, since they already told me how low it would play? Edit: I see it would be very helpful depending on what octave?

 

[Flipx99 5,000+ posts]

I didn't know the 12 dB slope part.

 

[DejaWiz 5,000+ posts]

So I don't really need to know the Fs then, since they already told me how low it would play?

Not necessarily. Knowing the Fs is the only sure way to know how you can tune your system within it's limitations. JL could simply be giving you a general "fail-safe" frequency that they provide to everyone.

 

[goodstuff 10+ year member]

Not necessarily. Knowing the Fs is the only sure way to know how you can tune your system within it's limitations. JL could simply be giving you a general "fail-safe" frequency that they provide to everyone.

So I should call them back and ask 4.8 k at what octave? I didn't think this would be that involved. So what your saying is they could play alot lower depending on the octave?

 

[DBfan187 5,000+ posts]

ask for Manville Smith. lol

 

[DejaWiz 5,000+ posts]

So I should call them back and ask 4.8 k at what octave? I didn't think this would be that involved. So what your saying is they could play alot lower depending on the octave?

Nope, just ask them what the Fs/resonant frequency of each tweeter is.

 

[goodstuff 10+ year member]

ask for Manville Smith. lol

Yeah, lucio was rude to me last time, lol.