Adrian_D

DB drive 7500 "slightly" modded and doing some other mods to improve reliability

'Grats !

The voltage which drops is the voltage rail ie the power supply output. Same thing happens when the load gets lower and lower in impedance. If the power supply would be ideal, power output would double with each halfing of the load.

Now I get it ! One new word learned today

Just thought this a good video of what happens when we get gain happy and want more power than the amp can output. You can see the blue line, that is the amplifier's voltage rail. The yellow sine wave is the output voltage The more we increase the gain (or the input voltage), the higher the output voltage and the lower the rail voltage. Voltage rail will never be stable, because of the design of the power supplies and because of the drop in battery voltage. At some point the peak output voltage will match the rail voltage. That is the maximum output. If we try to increase the gain or apply more input voltage, the output voltage cannot increase (it was equal to the rail voltage) and in consequence it starts to clip. Battery voltage: 14.4v (before the test) down to 9v (minimum) Voltage rail: 177v (before the test) down to 92.6v (minimum) Peak output voltage: 92v RMS output voltage: 92*0.707=65v Here is the video, shot by a friend This was tested on a 1ohm resistive load.

That doesn't sound like fun...how did you get the fake hundo ?

I am doing that. It's one of the reasons I asked for a desk by the window. I'm not doing it every 20 min though. I should start looking away more often. yeah the 20 minutes part is the key; staring at the screen for hours on end causes accomodative spasms. Remember the immortal words of Peter Gibbons: Frequent breaks and taking your eyes off the screen is the only way for your eyes to survive a desk job Written down ! Thanks

Good one Peng !

Boost makes everything better. It's a car-version of bacon...

I don't think it would work for them. They need the air flowing over the car for down force. F1 is all about controlling down force. That's what gives them the control they have. If you're stalling the air, you are decreasing the down force which will help top speed, but when you go to take a turn at 150mph, you are dead meat. Damnit, I was just about to type that ! Do you guys remember, there was a thing that added a lot of down force to F1, but was banned. I can't remember where I watched it, Discovery maybe. It was placed under the car by one of the teams and they won many times in a row. They didn't want to share the secret so it was banned. But trains and planes definitely should dimples... I vaguely remember something about that. Lots of things banned in F1 though.

I don't think it would work for them. They need the air flowing over the car for down force. F1 is all about controlling down force. That's what gives them the control they have. If you're stalling the air, you are decreasing the down force which will help top speed, but when you go to take a turn at 150mph, you are dead meat. Damnit, I was just about to type that !

This has been common knowledge for quite some time. I can understand why it has not been done on commuter cars as I don't think it would be too attractive and not many people would like it, but on semis, trains, and plains, this could save so much energy it's ridiculous. The ONLY negative I see is repairs. It would be almost impossible to match a curved surface without replacing an entire panel. I'd be down for using some kind of sheeting on the car for long trips. At least on the hood and roof.

Happy Birthday ! ! !

Moar when I receive pics from others. I was in the cars all day, helping people with testing and what not

The spl meter worked like a charm !

Car-audio meet went well. Surprising to gather 12 cars for metering in this cold weather. Pics are uploading

I cringed when I read that ^^ Why? Because it sounds better than what you probably have already? Notice I said probably. fixed. Wrong fix dude

de-fucking-licious. Saw a black one today coming home from school. The guy put his foot down starting from the stoplight...

You can do whatever you want. I mentioned previously, if the power supply blows and the mosfets short out you will basically have a short between + and - inside the amp. Blow on it, spit, piss, pour water put a blanket over, nothing will work. Here's some fire damage What amp is that? Digital Designs Z1. Ended up working good

6.3 ? Those things sound SOOO damn good. I'm green

Condolences man

Shit no http://www.fukung.net/random ^^^ great waste of time Blocked at the office. Be glad it is I lost many-a-school classes looking at that site...

You can do whatever you want. I mentioned previously, if the power supply blows and the mosfets short out you will basically have a short between + and - inside the amp. Blow on it, spit, piss, pour water put a blanket over, nothing will work. Here's some fire damage

Me neither and i have heard 2 other setups like this, no problems on the top end. One of them switched from Vifa XT25's to FR's and his top end improved a bit. Might have been aiming though. Having the unused tweeters in the a-pillars managed to fool a lot of people. Sean, I think you mentioned buying several pairs of FR's and testing out which one sounds better. Given their pricing that is a very good idea. Aaron, can the 8053 high-pass the tweeter outputs low ? As in 200-300hz ? I know the Pio 880 can't and neither can Alpines older than the 9833/9835.