Amp help

polarity · 10-06-2009, 04:31 PM

Oh at 1 ohms, ok I will look for that, when you have time could you explain why I'm looking at 1 ohms instead of 4?

-William

OVERZLUS · 10-06-2009, 04:40 PM

Quote:

Originally Posted by bigaudiofanat

I do not recommend a 4 channel amp for running subs. They are not made to run subs does not mean they can not but class D amps run subs better and run cooler as well.

True...that's why you are the pro...to help us dazed and confused people! can you recommend a decent 2-channel class D amp?

OVERZLUS · 10-06-2009, 04:59 PM

Quote:

Originally Posted by bigaudiofanat

I do not recommend a 4 channel amp for running subs. They are not made to run subs does not mean they can not but class D amps run subs better and run cooler as well.

Although, two of the original recommendations that you gave were Class A/B amps (Rockford and Hifonics)...

polarity · 10-06-2009, 05:52 PM

XMZR1252 - Sony 2 Ch. 800 Watt ZR Series Xplod Amplifier

That may be more than I need, but the price is great, curious if you had any thoughts on it. It does seem very big and hard to find a good spot to mount it.

-William

bigaudiofanat · 10-06-2009, 06:38 PM

Yes it is 125 watts per channel but will probably put out more after you set your gains.

bigaudiofanat · 10-06-2009, 06:45 PM

Stay away from sony

polarity · 10-07-2009, 09:52 AM

From Car Audio 101

Quote:

Ohm's

Okay ohms or Ohm's law is the rule of resistance that something has. Most of you probably think about things like rubber and all having high resistance and that is correct. But in car audio we use ohms for what a speaker's resistance is at. For example if you have a sub that has a 4 ohm single voice coil. Than that sub can be wired up to an amp with the resistance of 4 ohms.

The next part of Ohms is power. If you look at any amp's specs you will see that is has something like 100 watts RMS x 4 at 4 ohms (150 watts RMS x 4 at 2 ohms) 300 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode) so lets look at the first one. This one states that is can run 100 watts per channel "or speaker" as long as each speakers has a resistance or Ohm's of 4. The second one states that as long as all the speakers are at 2 ohms the amp can put out 150 per channel. The last one shows that it will put out to 2 channels 300 watts a channel if there ohms are 4 ohms. "you will also notice that is says 4 ohm stable at ridged mode." This states that the amp was built for the load of 4 ohms and is able to be bridged.

The thing with ohm's is that the higher the ohms the more resistance. So when you go with a lower ohms rating it can have much more power to run that speaker. You may be asking well can I wire different ohm rated speakers to two different sets output on an amp? You can ONLY do this if the amp is setup for it. If you want to get relay technical about Ohms law just google it and click on any of the first few links that come up. Or just simply ask.

RMS

Now you may have notice in the previous section when watts were being explained it said RMS. Something like 100 X4 at 4 ohms RMS. This is very important when choosing an amp. RMS stands for root men square. In normal terms this means what an amp can continue to produce for long periods of time none stop. You may bee seeing things like 1200 watts MAX. In a few simple words this is a gimmick the amps will never produce this power and no matter how hard you try there just not going to make it. You always look at RMS when shopping for an amp. You will even see it on head units saying 50 X 4 max it is rely putting out around 12-15 watts RMS.

But I still don't understand why if I purchased 2 speakers that are 4 ohm when I look for my amp am I looking at what it outputs at 1 ohm. Just so I'm clear before I order something thought if I find a dual channel amp that is putting out 250 watts per channel at 1 ohm then I have the power I need to run them?

Thanks again man
-William

OVERZLUS · 10-07-2009, 03:37 PM

When you wire the 4 ohm DVC subs to a 2-channel amp, the total impedance will be 4 ohms with the amp bridged. So whatever the amp is rated at 4 ohms will be what you get out of it. I would look for this : *** watts RMS x 1 at 4 ohms (4-ohm stable in bridged mode).

bigaudiofanat · 10-07-2009, 04:56 PM

Thanks overzlus yes when you wire your subs in parallel that is what the FINAL load will be 1 ohms.

OVERZLUS · 10-08-2009, 07:55 AM

Quote:

Originally Posted by bigaudiofanat

Thanks overzlus yes when you wire your subs in parallel that is what the FINAL load will be 1 ohms.

You lost me there when you mention 1 ohm...how do you come up with 1 ohm? Just trying to understand...

bigaudiofanat · 10-08-2009, 08:38 AM

Quote:

Originally Posted by OVERZLUS

Although, two of the original recommendations that you gave were Class A/B amps (Rockford and Hifonics)...

LOL as I said they can work. Just do not do it as good as more expensive amps that are class d. That is why they are cheaper.

bigaudiofanat · 10-08-2009, 08:44 AM

Quote:

Originally Posted by OVERZLUS

You lost me there when you mention 1 ohm...how do you come up with 1 ohm? Just trying to understand...

When you run 2 4 ohm dual voice coil amps in parallel and they are wired up together the final load is 1 ohm. If it was only 1 of them it could either be 8 ohms or 2 ohms depending on how you wire it. As I said in the 101 thread this is were ti gets confusing to a lot of people.

Here are a few new selections for what you are going to be running

P1000-1bd - Rockford Fosgate Punch 1 Ch 1000 Watt Amplifier

08ZX1000.1 - Kicker 1 Ch 1000 Watt ZX Series Amplifier

MRP-M1000 - Alpine 1000 Watt Mono Subwoofer Amplifier

This one just make sure to really set your gains lol

BXI 2010D - Hifonics 2000W 1 Channel Mono-Block Amplifier

bigaudiofanat · 10-08-2009, 08:46 AM

The other wiring diagram is correct but so is this one. You can choose how you want to run it.

OVERZLUS · 10-08-2009, 11:16 AM

Ok cool, now I understand. Thanks.

10-06-2009, 06:38 PM	#20 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 853	Yes it is 125 watts per channel but will probably put out more after you set your gains. __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

10-06-2009, 06:45 PM	#21 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 853	Stay away from sony __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

10-07-2009, 03:37 PM	#23 (permalink)
OVERZLUS Base Member Join Date: Aug 2009 Location: VA Posts: 34 Drives: 09 Nissan 370Z Sport Rep Power: 16	When you wire the 4 ohm DVC subs to a 2-channel amp, the total impedance will be 4 ohms with the amp bridged. So whatever the amp is rated at 4 ohms will be what you get out of it. I would look for this : *** watts RMS x 1 at 4 ohms (4-ohm stable in bridged mode). __________________ '09 Magnetic Black 370Z 7AT \| 35% Tint \| Audio System \| Fast Intentions CBE w/ 12" Resonators Last edited by OVERZLUS; 10-07-2009 at 04:18 PM.

10-07-2009, 04:56 PM	#24 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 853	Thanks overzlus yes when you wire your subs in parallel that is what the FINAL load will be 1 ohms. __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

10-08-2009, 08:46 AM	#28 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 853	The other wiring diagram is correct but so is this one. You can choose how you want to run it. __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

10-06-2009, 04:31 PM	#16 (permalink)
polarity Base Member Join Date: Feb 2009 Location: Mississippi Posts: 166 Drives: [2009 370Z] Rep Power: 16	Oh at 1 ohms, ok I will look for that, when you have time could you explain why I'm looking at 1 ohms instead of 4? -William

10-06-2009, 05:52 PM	#19 (permalink)
polarity Base Member Join Date: Feb 2009 Location: Mississippi Posts: 166 Drives: [2009 370Z] Rep Power: 16	XMZR1252 - Sony 2 Ch. 800 Watt ZR Series Xplod Amplifier That may be more than I need, but the price is great, curious if you had any thoughts on it. It does seem very big and hard to find a good spot to mount it. -William

10-08-2009, 11:16 AM	#29 (permalink)
OVERZLUS Base Member Join Date: Aug 2009 Location: VA Posts: 34 Drives: 09 Nissan 370Z Sport Rep Power: 16	Ok cool, now I understand. Thanks. __________________ '09 Magnetic Black 370Z 7AT \| 35% Tint \| Audio System \| Fast Intentions CBE w/ 12" Resonators