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soundsystemaniac

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Posts posted by soundsystemaniac

  1. Today, for the first time, I used my amm1 on a strapped pair of amps. Not that it matters, but the setup is 2 Sundown SCV 6000 strapped at 1 ohm. so each sees .5 nominal. I clamped 5800 watts through the positive side at .8. 

    Since the amps are STRAPPED, does that mean that i was clamping 5800 watts out of 1 amp or both amplifiers. and was it seeing .8 ohm per amp? 

    Please help lol

    p.s. nice to be here again. been a while!

  2. So, this amp is doing stupid awesome power through 1 run of 1/0 gauge which is maybe 6 ft long. If its ofc wire, it should be able to carry about 300 to 350 amps of current through that length right? So if voltage times amps is watts..before efficiency is factored in...how could it pull that much power through 1 run? Just trying to figure this out

  3. I am stumped by this thing. I dont want to make a new thread, so, I figured that I could just ask here. Why wouldnt the alternators internal regulator cause it to be able to do exactly what the vcm does and "lock it at 14.8" we have one in our demo van because the alternator (dc 320spxi) did not seem to charge very well. Like it would charge at like 13.8 or so and stay that way when it was warm. Now, we have the vcm in it and we can get it to constantly charge at 14.8. Why doesnt the internal regulator already do that? And when does the limit of the alternator get reached when you have a vcm? I know you cant power a 20000 watt system with 1 alt, but in theory, couldnt you just continue to bump up the voltage on the vcm to be able to maintain a 14+ volt charge to the batteries? Would the alt just fry itself in that case? If anyone could shed some light on this subject for me, i would apprecuate it!

  4. I am stumped by this thing. I dont want to make a new thread, so, I figured that I could just ask here. Why wouldnt the alternators internal regulator cause it to be able to do exactly what the vcm does and "lock it at 14.8" we have one in our demo van because the alternator (dc 320spxi) did not seem to charge very well. Like it would charge at like 13.8 or so and stay that way when it was warm. Now, we have the vcm in it and we can get it to constantly charge at 14.8. Why doesnt the internal regulator already do that? And when does the limit of the alternator get reached when you have a vcm? I know you cant power a 20000 watt system with 1 alt, but in theory, couldnt you just continue to bump up the voltage on the vcm to be able to maintain a 14+ volt charge to the batteries? Would the alt just fry itself in that case? If anyone could shed some light on this subject for me, i would apprecuate it!

  5. Looks sick but 1200 it's kinda to expensive.

    "expensive" is all relative....

    All my flip screen decks in the past (Pioneer Avic 1, 2 and 3's), my Alpine and Pioneer double din's......were all $1500 and up. I remember spending $1999 on my N1 at the time. So $1200 seems expensive until you look at the bigger picture. You get an Ipad mini, you get the dash kit, you get the kit ready to go for your vehicle. You not only have an ipad for a deck but you get to take it out and use it for other stuff. To me, it's worth it if you look at it like that. You can always do the work yourself if you got it like that :) I know i could but once in a while, i don't mind having the work done for me. Plus, those guys are getting damn good at it. :D

    Damn right they are good at it! I think I have watched about every episode of amplified that exists hah! I hope you enjoy it Steve! Im looking forward to trying an ipad install on my buddies f150 soon!

  6. Some simple math with your 3,000 watt Class D example at 14.4 VDC on sine waves would be:

    3,000 / .75 = 4,000 watts Input required x 2 = 8,000 watts input (is this to accout for efficiency of an amplifier???)

    8,000 / 14.4 = 555 amps of current

    Let's say your amps require 17 feet of power wire between them and the batteries and another 5 foot between them and the frame (chassis won't cut it here) for their grounds. To get 555 amps of current to your amps at 14.4 VDC, you'd need:

    Big Wire:

    - 1/0 AWG wire has .0001 ohms resistance per foot - 22 foot of it will have .0022 ohms of total resistance

    - 555 amps through 22 foot of 1/0 . . . 555 x .0022 = 1.22 Volts drop in the cable alone

    - 4 runs of 1/0 AWG . . . 555 x .00055 = .30 Volts drop in the wire - mo' better

    BEEFY Alts:

    - 300 amps at 14.7 volts . . . remember, we lost 3 tenths of a volt in our four runs of 1/0 AWG . . .

    - 2 required

    Now, if we add batteries, these need 7 to 10 amps of current each to allow charge to flow into them . . . I'm not seeing the benefit with the car running. But, if you wanted to jam this system with the key off then you'd need 'em for sure. Look at the AH rating on the battery you're shopping for. On music, these two amps would require roughly half of the current they require on sines . . . let's say these batteries had a 65 AH rating.

    555 / 2 = 277.5 Amps

    277.5 Amps / 65 AH = 4.3

    So, you'd need 4 to 5 batteries to play this system wide open on music for ONE hour. After one hour, nominal battery voltage would be somewhere around 10.5 to 11 VDC.

    And . . . these 4 batteries would require 40 amps of current to allow them to be charged with the vehicle running . . . better get Dom to up those alts to 350 amp models . . (when you say that batteries require 7- 10 amps of current to allow them to be charged, is that true for all agm batteries, or does that vary depending on size and capacity etc...)

    sorry about the off topic questions, but im interested in seeing the answers about the caps. i have always told the people that i install systems for, that a cap will hurt your system. (not that ive really dealt with people that have spent good money on a quality cap, but for the shitty swap shop ones, i tell them they will only hurt your system)

  7. 3 is fine, I had 1d3400 nd 2d3100s with similar power I was 13+ all day long

    alright cool.

    I would do whatever can fit under the hood and then two D3100. Will you be competing? Could out the 3100 under the hood and then get two XP2500s

    well a 3100 will fit under the hood (i will find out for sure today when my battery arrives lol) no, i wont be competing. it will just be for daily music--althought i do like to play things loud for a long time (not just 30 second demos or what not) so i just want to make sure i have the electrical to support that.

  8. i have just bought a 94 astro ext. it has the 4.3 vortech motor in it, and as far as i know, i will be able to fit the singer large case 350a alt.

    ive got my first d3100 on the way, and im looking to find out how many more i should get. i will be running an aq 3500 at .7, and a kicker zx850.4 at 4 ohms. I will have 2 runs of 1/0 gauge wire from front to back.

    what do you guys think?

    also, ive got the pos factory battery under the hood. keep it or just replace it with one of the d3100s?

    i was thinking i would need 3 d3100s altogether

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