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About LinkBacksI want to put 16 subs in to the back of my old astra van 8 facing 8 lmao
can competition subs do this ? face to face pull and push
and how do i wire batteries together ?
and do i need a 2nd alternator ?
I want to put 16 subs in to the back of my old astra van 8 facing 8 lmao
can competition subs do this ? face to face pull and push
and how do i wire batteries together ?
and do i need a 2nd alternator ?
Connecting in Series
When connecting your batteries in Series you are doubling the voltage while maintaining the same capacity rating (amp hours). This might be used in a scooter, Power Wheels kids vehicle, or other applications. Just use a jumper wire between the negative of the first battery and the positive of the second battery. Run your negative wire off of the open connector from the first battery and your positive off of the open connector on your second battery.
Connecting in Parallel
When connecting in Parallel you are doubling the capacity (amp hours) of the battery while maintaining the voltage of one of the individual batteries. This would be used in applications such as laptop batteries, some scooters, some ups backups, etc. Use a jumper wire between the positives of both batteries and another jumper wire between the negatives of both batteries. Connect your positive and negative wires to the same battery to run to your application.
It depends on what amps you're planning to use.
2 car batteries in series will give you 24v - if your amp is only designed to run off 12v then you will release the magic smoke.
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so is there any way of slower the power down ?
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
i have 4 amps to go in heres some of the spec
Power
1 X 1100 RMS 4 Ohm
1 X 1800 RMS 2 Ohms
1 X 2300 RMS 1 Ohm
1 X 3000 RMS @ 1 Ohm
THD at Rated Power: 0.5% @ 4 ohm
S/N Ratio*: 100 dB at rated power
Frequency Response: 10 Hz-30 KHz
Variable Low Pass filter 50Hz-250Hz
Variable Subsonic Filter 15Hz-40Hz
i think i will need to run 6 batteries to cope
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
So what are the amps rated at voltage wise ?
If you put 12v batteries in parallel they still give out 12v but you get double the power available. You need to make sure that they are pretty evenly matched though.
A car alternator will typically put out around 60 amps at 14 volts so a total of 840 watts. A 120A alternator will obviously put out double so around 1680 watts
With that kind of power you're not going to be powering much off the alternator if all amps are running full whack. You'll need to buy proper deep discharge leisure type batteries capable of the current drains required by the amps - the alternator will be used to charge up the batteries in between blowing out your window missions.
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i have all ready got my van ready i have welder metal windows in back of van and 3inches of conceret in the floor and i am 50/50 over putting bulk head in as need the cubic air space and the front side windows are plastic . .
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
Power Output 2.700 Watts with out over load
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
They don't give actual current draw for that amp but it requires a 250 amp fuse so I'd rate the battery (or batteries) to be able to provide at least that.Originally Posted by case
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As for your 16 subs, 8 facing 8 others and you said one bank pushes and the other pulls, that won't give you the sound pressure level you are looking, as one bank cancels the other, you wuill need to drive both banks in the same phase, i.e both either pulls or pushes depending on the amplifier's output polarity voltage. Just make sure your windscreen is glued in!
Our future lies in the past, we can learn from the past to forcast our future,
The windscreen is bullet proof literally and i have seen 2 subs face each other and the db's were round 170 mark could it 100% not be done then ?
HAS NORE DINGS THAN A CHINESE PHONEBLOOK,
No what i meant was that the speaker cones all must move in the same direction weather or not they are facing each other, for example if you had 8 speakers on the left bank and 8 on the right bank and the left speakers cones were moving outwards and the right speaker cones were moving inwards then the net result will cancel and you will not get a solid bass, you would loose a lot of sound pressure wave, but if both row of speakers had their cones move outwards, they will then push maximum sound pressure wave out and cause a greater impact, the cones would move out on a positive electrical wave and inwards on a negative electrical wave.
On the power issue, to get the maximum power out from your amplifiers, with minimum distortion, they must be driven by a power source that is capable of supplying all the current required to deliver the maximum power, at the correct input voltage, which being 12-14Volts, so if you were to run your amps at maximum say 3000watts RMS for both banks, (8 speakers per bank total 16) then the maximum likely current required to achiev that would be around 250 amps to 275 amps allowing for some losses within the power supply converters which are used to boost the voltage levels from 12volts to around 40volts plus and minus rails,
The amplifier in question you stated above can deliver 1700watts (RMS) into 2 ohm total impedience so for both banks you would probably be using two seperate amplifiers and each feeding 8 spaeakers wired in series/parallel arrangement to provide 2 ohm impedience, such that each bank must draw 125amps at 12Volts or even more when the battery voltage is slightly higher, to be able to provide this sort of current, you may well need 6 battereies, 3 for each bank, as you suggested each battery supplying something like 50Amps and at that continuous output level a 55AH battery would probably sustain the amps for about an hour to two, or may be even 3 hours , considering the fact that the output will never be constantly delivering the maximum power, as music and rythems varies in nature, and are never continuously steady wave at maximum level.
So basically you are on the right track as for achieving the power levels from your amplifiers, you will need 4 if not 6 batteries but they must all be wired in paralell and not in series as you are likely to blow your amps with over voltage and then you will also have charging isues, and don't forget you will also need hours to recharge all 6 batteries! In other words if the batteries were drained, and had less than 10% capacity remianing, they will need many hours to recharge at maximum alternator output, you could be looking at say 60amps charge (10amps into each battery for nearly 6 to 8 hours!! Possibly all night charging as the battereies get older and loose their capacity. There are much easier ways to achieve deafness, use headphones!(LOL)
I woukld consider running it off a diesel generator capable of producing 3KW to 5Kw power instead of 6 batteries, and have the generator exaust fumes taken out of the van. You then don't have any problems with expensive replacement of battereies, and for the cost 6 battereies you could get a power generator, but if it produces 230V AC, you must use either mains driven power amplifiers or use transformers to reduce the mains 230 ac into 14 V AC and use high current reactifiers to turn that into DC high current for your car amps.
Better still get a huge 12V DC generator and have that driven by your van engine with some contraption.
250amps is equivalent of a car engine being cranked, so now can you imagine how long can a single fully charged, good or a new c12V car battery sustain engine cranking for, before it dies......only a short time basically, on cranking engine it may seem long even one minute, but when you get intoxicated with a loud music, even half an hour can be a very short lived experience!
Last edited by MSG; 09-03-2011 at 07:36.
Our future lies in the past, we can learn from the past to forcast our future,
4 amplifiers
16 subs
6 batteries
Little to no experience
16 subs in two banks of 8... ? Could you clarify how this will be achieved, are you describing a tunnel arrangement, so each enclosure is facing each other across the van... Or are you going for a single enclosure with an 'isobaric' configuration ??
In any event, I would recommend you get onto TalkAudio and seek help and guidance from the SPL nutters on there...
if it sounds right to you, then its right.
basically mate if u wanna do amp up u do positive to positive and negative to negative if u do it the other way u will melt ur cars electrics coz astra van runs a 12v system also i would recomend another alternator hope this helps
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