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Old May 7, 2011 | 03:33 PM
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From: the moon
Default subs hit randomly

ok, when i turn my car on,after like 2 seconds my subs will go BOOM! even though no music is playing, this is only when i turn on the car. is this normal? somtimes it scares the crap out of me
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Old May 8, 2011 | 04:33 PM
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Default Re: subs hit randomly

Your amps remote turn on, is it wired to the radio? Also is the gain on your amp all the way up?
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Old May 9, 2011 | 06:53 AM
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Default Re: subs hit randomly

the remote on the amp is hooked up to the blue remote on the cd player. no my gain isnt up all the way but i will be buying a remote gain/bass ****
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Old May 9, 2011 | 08:11 AM
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Default Re: subs hit randomly

What kind of amp is it? Some amps (lesser priced) will not have "soft startup" feature.
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Old May 9, 2011 | 09:08 AM
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Default Re: subs hit randomly

Originally Posted by NVturbo
What kind of amp is it? Some amps (lesser priced) will not have "soft startup" feature.
Or you can run a relay and delay it with a resister to.
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Old May 9, 2011 | 03:48 PM
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Default Re: subs hit randomly

my set up is 2 12inch jbl gt4 in sealed box hooked up mono to a powerbass 800 watt 4 channel amp
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Old May 9, 2011 | 04:00 PM
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Default Re: subs hit randomly

Originally Posted by 0c00l
Or you can run a relay and delay it with a resister to.
huh? A relay activates when the correct current is ran through it. A resister will reduce the current but not delay it.
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Old May 9, 2011 | 05:15 PM
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Default Re: subs hit randomly

You just answered your own question. With a better quality amp, you will not have that problem.
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Old May 9, 2011 | 06:17 PM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
huh? A relay activates when the correct current is ran through it. A resister will reduce the current but not delay it.
Sorry, been a long day:
http://www.crutchfield.com/S-c0t3bBS...ech/kb327.html
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Old May 9, 2011 | 09:53 PM
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Default Re: subs hit randomly

Originally Posted by 0c00l
Ya that's not using a resistor. That is using a capacitor which takes time to discharge and a transistor to delay the relay from turning off.

That circuit wont help with turn "ON" pop though.
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Old May 10, 2011 | 03:41 AM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
Ya that's not using a resistor. That is using a capacitor which takes time to discharge and a transistor to delay the relay from turning off.

That circuit wont help with turn "ON" pop though.
It sure will, it allows some more time for a signal to get from the head unit to the amp, the reason he's having a loud pop on turn on is the amp has no signal hitting it.
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Old May 10, 2011 | 08:20 AM
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Default Re: subs hit randomly

Originally Posted by 0c00l
It sure will, it allows some more time for a signal to get from the head unit to the amp, the reason he's having a loud pop on turn on is the amp has no signal hitting it.
Sorry it wont. That circuit is for turn "OFF" pop. When power is removed from the ACC side the capacitor supplies power to the transistor to keep it "ON" until the charge is removed from the capacitor and then the transistor switches "OFF". Which then switches the relay off.

When you apply power to the ACC side it supplies power to both the capacitor and transistor at the same time. Which then switches the Relay "ON" at exactly the same time you supplied power to the ACC wire.

That circuit is only a delay for shutting down an amp not turning it on.
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Old May 10, 2011 | 08:51 AM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
Sorry it wont. That circuit is for turn "OFF" pop. When power is removed from the ACC side the capacitor supplies power to the transistor to keep it "ON" until the charge is removed from the capacitor and then the transistor switches "OFF". Which then switches the relay off.

When you apply power to the ACC side it supplies power to both the capacitor and transistor at the same time. Which then switches the Relay "ON" at exactly the same time you supplied power to the ACC wire.


That circuit is only a delay for shutting down an amp not turning it on.
Read the Crutchfield article its for on or off and what you said makes no sense, caps stay charged all the time until there discharged on the acc side(which usually takes a circuit), its why even after years of sitting in a closet you can hook up an amp and have it spark or discharge the second you apply ground.I guess we used them in vain then. Well to the OP spend more money and buy a new amp.
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Old May 10, 2011 | 12:46 PM
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Default Re: subs hit randomly

Originally Posted by 0c00l
Read the Crutchfield article its for on or off and what you said makes no sense, caps stay charged all the time until there discharged on the acc side(which usually takes a circuit), its why even after years of sitting in a closet you can hook up an amp and have it spark or discharge the second you apply ground.I guess we used them in vain then. Well to the OP spend more money and buy a new amp.
I don't need to read the article to know what that circuit does. In order for you to understand that circuit you need to understand how a transistor works. A transistor acts like a switch. You provide a small amount of current through the base to collector and it turns "ON" a larger current from collector to emitter. The capacitor stores a charge such that when the ACC is removed the capacitor will provide the current through the Base to Collector until it is drained. When the capcitor drains it can no longer supply current through the Base to Collector so the current through the Collector to Emitter also shuts off. When that happens the relay shuts off. This action is where you get your delay from.

In reverse when the ACC is applied it is applied to the capacitor and the Base at exactly the same time. Thus resulting in no turn on delay. I think if you reread that article a little more carefully you will see it was intended for turn off delay only.
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Old May 11, 2011 | 07:14 AM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
I don't need to read the article to know what that circuit does. In order for you to understand that circuit you need to understand how a transistor works. A transistor acts like a switch. You provide a small amount of current through the base to collector and it turns "ON" a larger current from collector to emitter. The capacitor stores a charge such that when the ACC is removed the capacitor will provide the current through the Base to Collector until it is drained. When the capcitor drains it can no longer supply current through the Base to Collector so the current through the Collector to Emitter also shuts off. When that happens the relay shuts off. This action is where you get your delay from.

In reverse when the ACC is applied it is applied to the capacitor and the Base at exactly the same time. Thus resulting in no turn on delay. I think if you reread that article a little more carefully you will see it was intended for turn off delay only.
I have made these circuits and used them, they work for turn on pop. As stated, its the amp powered up with no signal. I have a USA2000x it does the same thing so it's not the amp being a crappy amp unless a hand-made class AB amp is garbage to?
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Old May 11, 2011 | 08:08 AM
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Default Re: subs hit randomly

Originally Posted by 0c00l
I have made these circuits and used them, they work for turn on pop. As stated, its the amp powered up with no signal. I have a USA2000x it does the same thing so it's not the amp being a crappy amp unless a hand-made class AB amp is garbage to?
Believe what you want I guess.
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Old May 11, 2011 | 08:31 AM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
Believe what you want I guess.
It's not belief, I have done it.
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Old May 11, 2011 | 09:08 AM
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Default Re: subs hit randomly

Originally Posted by 0c00l
It's not belief, I have done it.
And pigs can fly

Lets quote the important parts of that article.

Usually adding a slight turn-off delay to the processor in question can solve this problem. This added delay allows the processor to remain on until the amplifier has powered down, thus preventing the pop.

Experimenting with the capacitor value will give you the right amount of delay before the EQ shuts off.

No where in that article does it state changing the cap will change turn on times.
The only turn-on delay you will get from that circuit is the time it takes the relay to flip contacts which is a few milliseconds.

Ok this is boring now. Have fun with your magic circuits.

Last edited by nsxxtreme; May 11, 2011 at 09:24 AM.
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Old May 11, 2011 | 11:25 AM
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Default Re: subs hit randomly

Originally Posted by nsxxtreme
And pigs can fly

Lets quote the important parts of that article.

Usually adding a slight turn-off delay to the processor in question can solve this problem. This added delay allows the processor to remain on until the amplifier has powered down, thus preventing the pop.

Experimenting with the capacitor value will give you the right amount of delay before the EQ shuts off.

No where in that article does it state changing the cap will change turn on times.
The only turn-on delay you will get from that circuit is the time it takes the relay to flip contacts which is a few milliseconds.

Ok this is boring now. Have fun with your magic circuits.
No where in your incoherent rambling did you disprove my statement. Thanks for playing though
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