Just tiding things up a bit.

Two new things.

From Car

Added A new alternator about 4 months ago, and changed the air intake. Now I have a enough space to add another battery under the hood. I am also going to replace the brushing on on the lower 150 amp alternator as they have worn out. Also romeo_electrical is one awesome guy on ebay.

Not quite car related

Well I got the H1N1. Guess how long I was sick? 2 weeks? 1 week? Nope 3 days. And I didn't even have the swine flu shot. Guess not being sick for several years shows how well my immune system is.

New amp, FUCK YEAH!!!!

Visonik V4000XD specs and internal pictures
Well I finally installed this amp in two days ago, been enjoying it thoroughly before writing up on it. It's the best amp I can find for high output voltage. Also its the SAME board as the MA Audio HK4000D. EXACT SAME BOARD, just half as much. (That's what the link above is for).
Also unlike the HK this thing has several extra output turns, which means higher voltage which = more power. I haven't tested it with a current meter yet to see how much power I'm using however I am able to tap out my alt, time to get a bigger one. Also the alt wire is really 2 gauge (it's larger than 1/2 an inch in wire diameter, but it's labeled and sold as 4 gauge) it's called kolossus fleks wire. Well worth the price. Also my ears pop (you know like when you go over a hill) when I listen to this monster, wish I bought it sooner.

New picks of my car.
Those are two 21" subwoofers. and they sound fricken sweet.

The good and the bad

I finally got the box made about a month ago. However the 1200 watt amp blew out. As a reminder the Planet Audio vx6002 has no DC offset protection, found that out the hardway. I will take pics when I buy the new amplifier I will of course be fixing the old one.

Two new things

First, is the alt, I finally got the right size belt (38.5 inch) for bracketmon's bracket. Now my belt don't squeal. Second up, I got the 1200 watt amp, which incidentally puts out 1250 watts at 6.6 ohms. I'm dying to see how well is does at 3.3 ohms. Yep it's also time to buy a a new battery post as this one is running out of room. Hopefully me and bracketmon should be able to get the new dual 21" sub box done by next week.

On-Star woes (suckers....)

Okay I just found out if you read here:
So if I use a cell jammer like the one I've built, it blocks all of those frequencies 850mhz (CDMA) and 1900mhz(DCS). If this is the case then for those who like to steal stuff, cell jammer on = no on-star, which = no cops, which equals not alerting the owner of the vehicle. Now I can easily deactivate my car alarm in under 5 seconds by popping the hood open and pulling the battery terminal off, and I'm no thief! I think they can do it faster than I. This tells me that on-star needs to get their shit in gear.
Original post below.

Thread: *ONSTAR* Cellphone mod View Single Post

12-09-2003, 11:34 AM	#10
Stock03CLS Registered User Join Date: Oct 2002 Location: Chicago-ish Posts: 5,314	Quote: Originally posted by Allout I heard that Onstar utilizes the Analog legacy cell system. If this is so, will the Onstar antenna work with a TDMA or GSM phones? OnStar does use analog, which is probably around 800MHz..maybe 850MHZ (if I remember my analog correctly). There is TDMA operation at 850MHz as well (I believe) so that should work. But, there's also TDMA at higher frequencies, like 1900MHz. Ditto for GSM. While the antenna might work for 1900MHz, the efficiency of the antenna might suffer, since 1900MHz is not a harmonic of 850MHz. Anyone know off-hand what frequency band the OnStar system uses? As long as your equipment uses the same band (or a harmonic thereof) you should be OK. Also, higher frequencies may not work, even at reduced efficiency, if there's an amplifier between the source and the antenna.

Stock03CLS

View Public Profile

Find More Posts by Stock03CLS

More power?

Unlike in Star Trek more power will not get you what you want. Why? Well for instance you could push 10,000 watts into an 4 ohm woofer, but it would fry in under a second, even less for 2 ohms. You see you want voltage, not current. The voice coil of the speaker is what makes the cone move up and down. Almost all subs use 20 gauge or smaller wire. Now how much current can 20 gauge sustain for an indefinite period of time? About 10 amps. How much voltage? About 200 volts. See where I'm going? Why did I use an 8 ohm sub in my car? Well my 8 ohm sub will soak up 60 volts at 7.5 amps. That's 450 watts RMS, 900 peak with an oscilloscope. Most subs can't play at 60 volts before breaking. However my can because of the high resistance. Because my sub puts out 107 db at one watt it requires very little power to operate. So at 450 watts I can put out 134 db. If you take that POS kicker which 88db efficient and put 450 watts into it you will get 115 db. Big fat freakin' difference eh? And there is also a limit to every subs maximum output potential, you will have a hard time finding it unless a. Your sub is a pro audio driver, in which case it's in the spec sheet. Or b. You will have to contact your speaker mfg to find out what it is. Most of the time the mfg will not want to state it because it is a rather low number. Now I know what I just said above probably rattled your brain and you have some questions, like "but my friend down the street has a kicker solo l17 and it sound loud." Yes it may sound loud but a bet you a 1000 bucks he can't play it that loud for very long, I've tested my sub at 50 hz at 60 volts for 48 hours, my sub never broke, and my amp stayed room temp (ap1200). His will most likely overheat in a few hours. Also when looking for a good amp go with a high RMS rating at 4 ohms, believe it or not, stay away from mono sub amps. They are meant to run at 2 ohm's which is cheating by allowing more current rather than voltage, current is easy, just make the wire on the transformer core larger, voltage is more difficult you need to wind more wire, 60 volts output (at 12 in) is a 1 to 5 turns ratio. Now typically high voltage does not mix with high current (low resistance) which is fine, I like my 8 ohm sub which actually halves the THD.

I promised I would upload images of my car: