bshumate2003@yahoo.com

okay i got my whole stereo all wired up right and professionally done but the subs still cut out after the volume is over 25 some body told me a power compassitor would fix this ... does anyone know if it would ?

toplessFC3Sman

iTrader: (1)

actually, i think what you need is the flux capacitor... you want to be able to store up that flux and tear a hole in the space-time continuum

classicauto

iTrader: (3)

perhaps the audio section might have a better answer.......

My5ABaby

iTrader: (7)

I'm not an expert by any means, but if it was done right/professionally, shouldn't this problem not exist?

VacavilleFC

do any of your lights dim when the bass is hitting?
what gauge wires are you running for the amp?
what model rx7 do you drive?
is the amp shutting off when the bass cuts out?

2nd gen alternators are only like 60-70 amps, depending on how much **** you have running you may be right at peak and when you turn your volume past 25 you pull too much amperage and it cuts.

you could also be using too small of wire and there not allow enough current.

or you could just be running a shitty amp that doesn't work right.

it could be a shitty ground.

you need to be more specific or i can go on forever with possibilities

YaNi

iTrader: (2)

I always run a positive and negative cable back to the battery, and I've never had a need for a capacitor.

cloudx189

iTrader: (3)

I agree w/ the flux capacitor... y'know... it makes time travel possible. I remember when the Doc thought of it. When he slipped and bumped his head while standing on his toilet to hang a clock... damn.

Sideways7

iTrader: (7)

First of all, its a capacitor, not a compassitor. And yes, you might need a cap for it to operate at high levels. You might also need larger wires or a better amp, or a number of other things.
I agree 100% with My5Ababy - if it was done professionally then this shouldn't be happening.

ericgrau

iTrader: (1)

This has little to do with the alternator. If your battery is dying and your car won't start, then you need a bigger alternator.

Get a multimeter. Measure the voltage on your battery. Now crank up the volume. If the voltage drops a volt or so, you need to buy a second battery or replace your battery with one that can handle more amps. If the voltage stays steady, get some long wires and measure the voltage between your amp and your battery (positive to positive). Again, you should be cranking up the volume. If you measure more than one volt, you need to get bigger wires. If neither of these are the problem, you need a capacitor.

Okay now to size the capacitor:
E = 1/2 * C * V ^2
The human limit of hearing is about 30Hz. I'll assume you'll want it to handle bass as low as 40Hz. So the capacitor needs to last 1/40 = 0.025s

P = E / t = (1/2 * C * V^2) / 0.025s = 20 * C * V^2

But that's if we fully drain the capacitor down to 0V. Not good. Let's say we want to the capacitor to drop no more than 1V

P = 20 * C * (12^2 - 11^2) = 460 * C

or:
C = P / 460.

So at the very least I'd say you need 1 Farad (F) of capacitance for every 460 watts (38 amps) your amplifier/speakers use. But you will get better sound quality if you get twice that or 4 times or more. Make sure you buy a capacitor that is rated for at least 15V. And next time try the audio section. I don't know exactly how small of a voltage drop you need for good sound quality. They might know, or if not they still might make a good guess on how much capacitance you need. Wire the capacitor in parallel with your battery or, better yet, your amplifier's power input. You may use multiple capacitors. 2 1F capacitors = 2F, etc.

mike_merryguy

iTrader: (8)

okay not necessarily true!! you have to be careful there, parallel and series connections make a difference, I can't remember off the top of my head but I THINK that 2 1F caps in parallel make about 2.5F cap or something, been a while on that one, LOOK IT UP though b4 just installing this or you could end up spending 200 bucks on 2 caps and get a .5F cap out of it b/c you hooked them up in series vice parallel!!! search the web too for big caps, I bought a 10F digital cap by Lanzar for 135 bucks!! a 1F cap at your local Cheap Stuff will run 99 bucks 140 if you add the digital crap to it, and mine looks cool too, even though its hidden

I would get a cap regardless but I have been told that upgrading your MAIN neg batt cable to a higher gauge will help, haven't done it yet, but I am running 10F cap, not to many probs with power with that...
again this is only if your lights seem to dim when the bass hits hard or steady dim with steady bass, vice versa...

OK not to retype this cause SPELL CHECK SUX and refreshed my page!! LOL i hate computers, any way...

speakers 'cut out' at volume of 25, I am assuming you mean the completely shut off and you have to turn it down to get them back on, IF so this is protect mode on your amp which can be caused by a few things but most likely one of these 2 things is your problem
1 your gain is too high on the AMP, if you have a standard radio the output of the RCA's is going to be less than 3v, not sure exactly but less than 3v( should be in the paperwork for head unit ) if you are using an RCA converter, IE a piece that hooks up to the speakers and has RCA out, then you can change the voltage with that thing, probably NOT using that if professionally done, anyway
the GAIN should be set according to the RCA output levels, if its too high it will simply distort the input signal and cause bad sounding bass then eventually go into protect mode, try and turn that down a 1/4 turn and see what happens, if you can now go up to 30 or 35 then maybe thats all you need, tweaking the settings is the hardest part...

2
speakers not connected properly, there are two ways to connect your speakers, series and parallel, a series connection is

AMP NEG to SP1 NEG SP1 POS to SP2 NEG SP2 POS AMP POS
this will produce a good sound and will require MORE power to push the amps due to the OHM value of the speaker combo (will get into soon)

parallel connection is easy
all speaker POS to amp POS
all speaker NEG to amp NEG
simple...

ok the OHM part, this gets more complicated if you have dual voice coils, refer to the manuals of your particular speaker for detailed info...

ok I'll just put this as simple as i can

Series connection : add the ohm values together IE: two 4 ohm speakers = one 8 ohm speaker connected in series one 4 ohm and one 2 ohm is a 6 ohm speaker now.. not hard

Parallel connection : reciprocal sum of the reciprocals HA sounds technical huh, not really...
ok say you have the same two 4 ohm speakers and connect them in parallel
do this formula
r1 being speaker one resistance (ohms)
r2 being speaker two resistance
RT bing the total resistance
1/R1 + 1/R2 = 1/RT

so .25 + .25 = 2
use the 1/x button on your computers calculator do do the math for you
you will get .5 then you have to do 1/.5
if you have more than two speakers it will just fall into place
1/R1 + 1/R2 + 1/R3 = 1/RT

all 4 ohms will look like
1/4 + 1/4 + 1/4 = 1/RT
.25 + .25 + .25 = 1/.75
.25 + .25 + .25 = 1.3333333

now if your amp is like most amps out there in the world then you most likely cannont handle a load below 2 ohms, check the manual like I said, if it doesn't say ONE OHM STABLE its not and don't try it, you will blow it over time

also keep in mind, even if the speaker is advertised at 4 OHMS it may be below or about by .2 or .5 or whatever
my 4 ohm pioneers measure at 3.8 so parallel that puts me at 1.9 ohms and that is no good for my amp unless I am in hi current mode which lowers my RMS power out, anyway try those two things, see what happens

oh yea one more thing, if you are testing option 2 that only applies if you are bridging your speakers, if you have a two channel amp and 2 subs and using each one independently this will do you NO good whatsoever

like I said I just retyped this b/c spell check sux so if someone notices a mistake in what I typed lemme know I'll stand corrected if I need to be, but in my quick typing I think I still got the formulas correct..

Snyper

i have a capacitor very cheap too if youd like it. I dont really do much with stereos and my friend gave it to me.

magus2222

iTrader: (22)

mike_merryguy has it, if you need to be running more than one farad of capictance, then you need to start checking stuff.
i did a full system with a 4 channel amp to 2 sets of components speakers, that was 1000 watts, then the 2 channel was another 1100 watts, i ran a 1 farad capiciter in series.
sounded AMAZING!

peace