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Old 13th July 2004, 05:09 AM   #1
DREW028 is offline DREW028  United States
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Post adding capacitor

can some help me.. i want to add an internal capacitor and change 1 in my amp.. ive seen internal pictures of the amplifer that is the higher serires ( ihave the street machine and high series is the stealth).. there not a big differnece between then.... the board is long but because of the location of the preamp and there is an extra capacitor..also there is a bigger 1 in the stealth series... the stealth puts out 1500 watts at 1 ohm and mine puts out 1200...by changing and adding the capacitos will this increase the power off my amp?..

i can get internal pics of the amps if needed.
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Old 13th July 2004, 09:24 PM   #2
bob123 is offline bob123  United Kingdom
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in a word NO

but if done correctly you could allow the output of the amp to
1. prevent hum.
2. when loud sounds e.g. a snare drum the amp will be able to get the power from the caps and therefore allow this to be reproduced without clipping.

changing the components of an amplifier will change the way it sound and it may be in a negative way.

the max power for the amp is dependant on the voltage of the transformer. e.g. a amp with 40v input transformer will only be able to produce 200w with 1 8ohm speaker.

40/8 = 5
5 x 40 = 200
provided the tran has the correct va power.

if your input transformer has a va rating lower that the rated power output then capacitors may be benificial.
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Old 13th July 2004, 10:12 PM   #3
DREW028 is offline DREW028  United States
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so dont even bother?........how can i test voltage of the transformer? the amp is ratted 1200w at 13.5v so i would have to be powered on with the 13.5 volts to test it right?
i will post internal pic of the amp soon
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File Type: jpg autotekstealthg.jpg (46.4 KB, 67 views)
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Old 13th July 2004, 10:20 PM   #4
DREW028 is offline DREW028  United States
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heres a pic of the stealth amp
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File Type: jpg autotekstealthg.jpg (46.4 KB, 62 views)
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Old 13th July 2004, 11:05 PM   #5
bob123 is offline bob123  United Kingdom
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do you have the va rating for the transformer.
this will be on the transformer or the next best thing would be the power consumption rating in watts. this will give an idea whether a big cap is nessisary or not.
oh and you say it is rated at 1200w through 1ohm. this means that for every volt there is an amp (ohms law) therefore the voltage should be about 34.6v (35v) and the current will be 34.6(35a) and the va rating of the amp is unlikly to be 1200va so therefore caps should be benificial.

are the speakers you are using 1ohm?

what is the capacitance of the caps on your amp?
the big one as this is the filter cap for the power supply.

basicaly if you are running 1ohm speakers which i have to say is a bit of a stupid thing to do. the amp will be improved by increasing the size of the filter cap but if you are only runing say 4 ohm speakers the caps will make no difference what so ever due to the fact that they will supply enough current for 1ohm so 4 times less that current will be no problem for it.
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Old 13th July 2004, 11:14 PM   #6
DREW028 is offline DREW028  United States
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i have 2 subs... they are dual 1.4 homs but i tested them and each coil is 1.9ohms.. i only plane on useing 1 of thm wired Parallel so .9 ohms.. i let my brother use my amp so when he get home i will look at the transformer and the cap ... the only other problem is i dont know the rating of the big cap in the stealth..but ill look around to see if i can find someone that can help me with that.
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Old 13th July 2004, 11:18 PM   #7
DREW028 is offline DREW028  United States
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i was just looking at the manual.. the consumption is 58a ... also there is a internal 60amp maxi fuse but i changed it to a 80amp.
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Old 13th July 2004, 11:29 PM   #8
bob123 is offline bob123  United Kingdom
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58 amps - i take it that is after the transformer rater than the mains current drawn as that would give 13920w.
how many chanels does the amp have?
do you have any ratings in watts or volts. other than the output power.
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Old 13th July 2004, 11:33 PM   #9
DREW028 is offline DREW028  United States
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its a class d mono block amp... so 1 channle
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Old 13th July 2004, 11:43 PM   #10
bob123 is offline bob123  United Kingdom
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oh you say you are using 0.9ohm speakers. this will make the power of the amp wrong as the current will exced by 10% what it is suposted to.
this could
1. dammage the amp if used too loudly current will exceed the ampount the components can take.
2. cause the filter cap - the big one - to drain and cause clipping.

larger caps will allow more time for the caps to charge and more power for them to use so it is probaly worth it if you are using very low impedance speakers.

but anyway i would like to point out that the difference in loudness between a 1200w amp and a 1500w amp is about 1db-2db
as increasing the power by 2 will only increase sound by 3 db. this is not much.
to increase sound by 2 you would have to get a 12000w amp (power x 10). sounds crazy but its true
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