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Am i going to damage something?

Old 08-15-2009, 09:24 PM
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Am i going to damage something?

As stated in other threads, i have 2 SVC 4 ohm subs.
They're 375 RMS 750 Peak .
My amp is 640 at 4 ohms.
My amp doesn't say anything about 2 or 1 ohm loads or the power it can give them. However about an hour ago i hooked up to deliver a 2 ohm load to my amp. The subs got louder. Not by a lot, but definitely a notable increase in volume. Before, at around 20/35 or greater, my deck would shut off and reset when idled, and repeat until i turned the volume down or started to give the car gas. This has stopped, i now made it to 35/35 while idling for a few minutes. My subs seemed to be in good shape during all of this, no wierd smells and no over heating issues with the amp.
Am i giving my subs more power?Would the subs that were getting 640 at 4 ohms now be getting 1280 at 2? Do you think i may hurt my subs this way?
Edit:
My friend also hooked up an aprox 1.33 ohm load using 3 10 inch subs and it seemed like a huge increase in wattage over his 1000 watt amp.
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Old 08-15-2009, 11:42 PM
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I think we took care of this and I hope I have answered all you questions and you found my advice to be helpful. if you have any other questions please fell free to PM me and Ill hit ca back!
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Old 08-15-2009, 11:43 PM
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yeah thanks for all your help!
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Old 08-15-2009, 11:47 PM
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Google is your friend. Holy hell I hate SVC-4ohm. Two of them can wire up into a 2-ohm load. If your amp can do 640W @ 4 ohm, it most likely will be around 1300W+ maybe 1400W @ 2ohm. You're overpowering each sub by 265W+, but that's if your electrical is up to par, it's not a lotta watts, your amp is probably only pushing 750W at any given time, even less on continuous basslines, and you don't have your gains up all the way right? Call it 600W. Now you're underpowering. Most companies probably measure their actual RMS with full gain & eq - Is your amp a Clarion or Kenwood? My Kenwood 550W amp was absolute crap. If you can't turn up your volume fully it's because your amp is crap because it's probably a Kenwood (I'm kind of joking), you seem like you wired it up correctly. Upgrade your battery, alt, and/or just get 1.0 wiring - it'll atleast be more efficient. My stock Sunfire (90A) powered a [email protected] amp better than my old buick with 550W. Run them at 2ohm and keep the gains down, it's not like you can't adjust these things. Most of us just want to have an amp that'll *almost* wreck our subs. Eventually we all decide to switch up, but before we do, we turn it up and break stuff. You'll see the surround almost cave in and make an ugly sound when it happends. Google your amp for specs.

My 1500W amp did [email protected] & [email protected], you'd think it'd do [email protected]

"My friend also hooked up an aprox 1.33 ohm load using 3 10 inch subs and it seemed like a huge increase in wattage over his 1000 watt amp."

3 10's have a surface area of 235.5, 2 12's have 226. Do you mean an increase in wattage ON a 1000W amp? That doesn't make sence, subs don't make watts. A huge increase in dB compared to what, your 2 12's? Over 3 10's on an amp doing [email protected]? Well of course, you're doubling the power almost, and he has more cone area than you.

Surface area
(10" / 2) = 5 x 5 = 25 x 3.14(pi) = 78.5
12" = 226.xx
15" = 176.xx
18" = 254.xx
21" = 346.xx

What kind of vehicle? If you're unsure if your subs are blown or about to, push on the cone and if you feel the coil scraping on the sides, she's facked.
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Old 08-15-2009, 11:50 PM
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Also check your fuses.
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Old 08-15-2009, 11:51 PM
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Lightbulb

Hmmm....we would need the amp name and model to be sure.....

There are a few things to keep in mind no matter what tho......

If it's a 2 channel and you were running the subs at 4ohms stereo, wiring it to a 2 ohm mono load will draw more power from the car and deliver more to the subs. How much depends on the capabilities of the amp and how much power your electrical system can deliver.

Most 2 channels are not designed to run at 2ohms mono, if the amp is not over-heating consider your self lucky and keep an eye on the amp if you're going to pound it for a while.

The fact that the deck would crap out at idle is a bad sign.......get a buddy and a DMM and check the voltage level at the amp power inputs at idle and with the engine revving a bit. Turn the volume up and down at each speed and keep an eye on the voltage. Do the same thing at the battery terminals. They will probably vary by 2 or 3 volts and doing the Big 3 will help with that.

I doubt the amp is now putting out 1,280Ws, but the extra stress on the amp may cause it to start clipping earlier. This is the most likely way you can damage the subs, they are rated for even more clean power than you can give them with your present amp.

HTH
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Old 08-15-2009, 11:52 PM
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Originally Posted by rbgnwa45 View Post
Google is your friend. Holy hell I hate SVC-4ohm. Two of them can wire up into a 2-ohm load. If your amp can do 640W @ 4 ohm, it most likely will be around 1300W+ maybe 1400W @ 2ohm. You're overpowering each sub by 265W+, but that's if your electrical is up to par, it's not a lotta watts, your amp is probably only pushing 750W at any given time, even less on continuous basslines, and you don't have your gains up all the way right? Call it 600W. Now you're underpowering. Most companies probably measure their actual RMS with full gain & eq - Is your amp a Clarion or Kenwood? My Kenwood 550W amp was absolute crap. If you can't turn up your volume fully it's because your amp is crap because it's probably a Kenwood (I'm kind of joking), you seem like you wired it up correctly. Upgrade your battery, alt, and/or just get 1.0 wiring - it'll atleast be more efficient. My stock Sunfire (90A) powered a [email protected] amp better than my old buick with 550W. Run them at 2ohm and keep the gains down, it's not like you can't adjust these things. Most of us just want to have an amp that'll *almost* wreck our subs. Eventually we all decide to switch up, but before we do, we turn it up and break stuff. You'll see the surround almost cave in and make an ugly sound when it happends. Google your amp for specs.

My 1500W amp did [email protected] & [email protected], you'd think it'd do [email protected]

"My friend also hooked up an aprox 1.33 ohm load using 3 10 inch subs and it seemed like a huge increase in wattage over his 1000 watt amp."

3 10's have a surface area of 235.5, 2 12's have 226. Do you mean an increase in wattage ON a 1000W amp? That doesn't make sence, subs don't make watts. A huge increase in dB compared to what, your 2 12's? Over 3 10's on an amp doing [email protected]? Well of course, you're doubling the power almost, and he has more cone area than you.

Surface area
(10" / 2) = 5 x 5 = 25 x 3.14(pi) = 78.5
12" = 226.xx
15" = 176.xx
18" = 254.xx
21" = 346.xx

What kind of vehicle? If you're unsure if your subs are blown or about to, push on the cone and if you feel the coil scraping on the sides, she's facked.
From what i've gathered, hooking up a 2 ohm load to a 4 ohm amp is a bad idea. It is not stable at 2 ohms. It is an apx 640.2.
Prior to switching it to what it is now i had each sub in it's own channel.
Which now that i think about it was hooking up a 4 ohm load to a 2 ohm channel.
Now i just sort of reversed it. Are both situations damaging?Should i wire them to be 8 ohms and bridge it?

Last edited by leftbehind; 08-15-2009 at 11:58 PM.
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Old 08-16-2009, 12:37 AM
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You want the subs ohmage to be the same as the amps, 1&1, 2&2, 4&4. If you run each sub on it's own channel, it'll be 4 ohm & 4ohm (that's if one SVC4 wires into 4(or 1!) ohm on it's own), I forgets. If 4ohm, that's 320W to each sub. Yeah, you did hook up a 4ohm sub load to a 2-ohm channel, maybe even a 1 ohm sub load to a 4ohm amp load or 8 ohm channel, now I'm just throwing numbers lol. You were drawing too much power, wire it back to 4 ohms. This is why people use 1ohm loads on 1ohm amps LOL! If you bridge both at 8ohms doesn't that mean it'll be like, 1 ohm again?

Is this correct, someone?
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Old 08-16-2009, 12:45 AM
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A 640W x 2 channel @ only 4ohm amp is like... a component amp.
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Old 08-16-2009, 12:59 AM
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Originally Posted by rbgnwa45 View Post
You want the subs ohmage to be the same as the amps, 1&1, 2&2, 4&4. If you run each sub on it's own channel, it'll be 4 ohm & 4ohm (that's if one SVC4 wires into 4(or 1!) ohm on it's own), I forgets. If 4ohm, that's 320W to each sub. Yeah, you did hook up a 4ohm sub load to a 2-ohm channel, maybe even a 1 ohm sub load to a 4ohm amp load or 8 ohm channel, now I'm just throwing numbers lol. You were drawing too much power, wire it back to 4 ohms. This is why people use 1ohm loads on 1ohm amps LOL! If you bridge both at 8ohms doesn't that mean it'll be like, 1 ohm again?

Is this correct, someone?
I don't mean to be rude,and please don't take this the wrong way but it doesn't sound like you have a clue what your talking about.
Don't give advice if your not 100% sure. giving false information could lead to fried stereo gear and pissed off people.
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