post pics of your stereos/systems - Page 2 - Car Audio - Third Generation F-Body Message Boards

NEEDAZ · 02-17-2005, 07:44 AM

Quote:

Originally posted by crazycamaro83
mtx thunder amp with a fosgate cap. so when its all done ill swap that in. but yeah for sure lightning audion isnt worth nothing.

FYI: Lightning audio is made by Rockford. They are the same as Rockford on the inside. Just cheaper, that's it.

ScrapMaker · 02-17-2005, 09:34 AM

that's pretty funny... I wouldn't buy either brand

does lightning audio make anything worth putting in a car? cap, amps, or speakers?

85_ZED28 · 02-17-2005, 09:59 AM

isnt a 1 farad capacitor a 1 farad capacitor? I mean how can one brand be better than another?

ScrapMaker · 02-17-2005, 12:49 PM

well I'm no expert, but couldn't even if both capacitors hold the same amount of energy, one could be more efficient at charging itself up, and others may maintain charges better... I think that's sorta related to ESR... maybe not. plus some can possibly be drained faster than others... those are the only 3 factors I can think of, other than longevity of the capacitor itself.

snflupigus · 02-17-2005, 12:50 PM

1 12volt battery is the same as another 12v battery.....

doesnt quite fit does it? --- same with caps

NEEDAZ · 02-17-2005, 01:29 PM

The only thing that is different is the labeling, I've talked with the RF engineers about this. They are the same except for labeling....

ScrapMaker · 02-17-2005, 02:02 PM

so might as well go get the 2 farad caps from walmart, right

85_ZED28 · 02-17-2005, 03:05 PM

Quote:

Originally posted by ScrapMaker
well I'm no expert, but couldn't even if both capacitors hold the same amount of energy, one could be more efficient at charging itself up

i don't think capacitors of the same value have varying efficiencies. Capitors fully charge after 5 time constants, which is determined by the resistance of the circuit and the capacitance.

ScrapMaker · 02-17-2005, 03:22 PM

I mean, two 1.0 farad capacitors can have different efficiencies..

tilstad · 02-17-2005, 03:49 PM

Where do you guys buy matching carpet to use on the sub boxes? I have the standard light gray, havent seen that anywhere.

ScrapMaker · 02-17-2005, 05:19 PM

audio shops have it all the time... but check some of the sponsor links at the top, since they would most likely have carpet that will match our cars.

snflupigus · 02-17-2005, 05:25 PM

http://www.audiooutfitter.com/store/...ml?id=irfxebWq

we used to sell these at my families shop

True, as with many components, some are the same with different labeling... but also true, levels of design and craftmanship and quality of parts on ANY electronic device is going to make them different. They are not all the same.

ScrapMaker · 02-17-2005, 05:33 PM

is a 15,000watt system even feasable?

15,000watts/12volts = 1250amps... hrm

that's the only time you'd need a 15 farad capacitor

you'd only need 15 batteries, 15 alternators, and 1/0 wiring all around

I think those big caps are a gimmick, because you can get some 15 farad caps for the price of a 2 farad... some..how...

snflupigus · 02-17-2005, 06:36 PM

It's just over-built... they dont even make them anymore. Not a gimmick. It's just goverment technology passed down

History of the company...

http://www.alumapro.com/rvn4.html

NEEDAZ · 02-18-2005, 09:19 AM

Those square or other odd shaped caps typically have horrible ESR ratings and degrade rapidly. I didn’t see an ESR value list (no shock) and in two years it will be higher then whatever it is.
And with the Rockford/Lightning being the same. Take one of each for the same year and similar specs apart and look. Same thing. As in no different.
I will eat crow in that this was the case 4 years ago and according to the engineer at RF they still are.

ScrapMaker · 02-18-2005, 09:22 AM

RF engineer is the Rockford Fosgate engineer?

and yeah, I don't see the benefit of at 15 farad cap if its going to lower your output voltage.

NEEDAZ · 02-18-2005, 09:34 AM

It will not lower the out put voltage. In the other post the voltage drop I was referring to is internal to the cap.

And yes, RF=Rockford

ScrapMaker · 02-18-2005, 09:37 AM

okay so if the voltage drop is on the inside of the capacitor, what difference can you see on the output of the capacitor? The output difference of a crappy esr, and a good esr?

does the esr basically deal with "current over time"? So the better the esr is, the more current can flow out faster? because the resistance is lower internally?

DustyJL · 02-20-2005, 07:40 AM

FyreLance · 02-20-2005, 08:55 AM

^ That's pretty nice!

JamesY · 02-22-2005, 12:08 AM

I think he likes JL's stuff

NEEDAZ · 02-22-2005, 07:35 AM

Good color match on the JL. I'd like to see the wires hidden. But other then that vary nice. Adds some splash with out being over the top.
We're way off topic with all this ERS stuff, but it's started so...
It effects how long it take the cap to change and how fast it discharges. If you run the math for time constants and keep in mind that the cap is only need at base "hits" which are fast you'll see how bad it can get. Also remember that an amp (or amps) that pull 80A (not uncommon) are a load of 0.15 ohm. That makes an ESR of 0.015 ohm a big concern. There's also ESL, not really a concern here, just mixing it up.

BlackMagic · 02-22-2005, 07:55 AM

This is my newly built sub box. All the components in the box will get replaced with Kenwood, since i have always had no problems with them. Please let me know what yall think...thanks...

Oh and once the box is completed, it will be carpeted to match the interior, and diamond plate under the amp.

NEEDAZ · 02-22-2005, 08:03 AM

I seen that in another post. I really like that. Just something as simple as some angles really sets the box off. Though I'm not a fan of mounting the amp to the box, for reliability of the amp. You may consider using some foam under the new amp.

ScrapMaker · 02-22-2005, 09:32 AM

if the box is well constructed, it shouldn't vibrate much, right? That's the whole point of making a nice, thick box. The speakers and your brains are the only things that are supposed to be rattling.

I've seen some boxes with plexiglass windows and they vibrate too much, which can cause the amp to fail...

NEEDAZ · 02-22-2005, 11:05 AM

The box may not flex, but it still vibrates. That's the problem.

ScrapMaker · 02-22-2005, 03:28 PM

either way you're right about mounting it right on the box... even though I've seen this done many times, I wouldn't personally do this, that is, unless absolutely necessary.

snflupigus · 02-22-2005, 07:56 PM

everything vibrates... a well built box just doesnt resonate.

BlackMagic · 02-22-2005, 08:02 PM

trust me i have thought about everything that yall have brought up, but it is built like this for a purpose. When i was designing the box, i wanted something that i could take out easily for the special track days. With the way that i built the box with the well it currently slides out easily, and disconnects quickly, and even goes back in easier. So thats why the amp is connected.

Saigon_Bob · 02-22-2005, 09:27 PM

im glassing mine but im making sure i can take it out if i need to.....and if im gunna race im just gunna make sure i have the HP and TQ to overcome any extra weight.

i have a daily driver, almost never racer so comfort is first