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Old 04-16-2007, 06:01 PM   #1
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Default Ohm Question

Ok, previous post was about selling RF - 301M amps. Those were 2 Ohm load amps.

The amp I am looking at getting is a T20001bd Mono (used) amp.

At 1 Ohm the amp puts out 2800 watts
At 2 Ohm = 2000 watts
at 4 Ohm = 1500 watts

Ok, my goal is to run it at 4 ohms into two P3 Dual voice coil 2 Ohm speakers. I was told I could not. I could either run the T20001bd at 1 Ohm or 8 Ohm only. Well 1 Ohm will definately kill my speakers. 8 Ohm, not worth the upgrade.

I do not want to buy new speakers, I would like to keep my current ones, (Save money)

Is there a way to make this work? Run the amp at 4 Ohm into my P3 12"'* 2 Ohm dual voice coil speakers? Some way to make it work by fancy wiring or whatever?

Sorry I am not a electronics guy.

Thanks for the input guys.
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Old 04-16-2007, 06:07 PM   #2
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not possible, 0.5, 2 or 8 ohm are your choices.

you could run it at 2ohm, and just try to tune the amp down enough to not cause damage
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Old 04-16-2007, 06:08 PM   #3
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I would say run a 2 ohm load, just turn down the gain on the amp.

Get a two ohm load by wiring each speakers two voice coils in series. This will give each speaker a 4 ohm rating. Then take the wires from each speaker and run them parallel to the amp for a total overall load of 2 ohm.
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Old 04-16-2007, 06:17 PM   #4
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Yah, you can not run 4 ohm because the way the resistance is set up on the speakers. 2 ohm would not kill them just turn the gain down...here is a wiring diagram

you can find more on cardomain and crutchfields pages.
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Old 04-16-2007, 06:21 PM   #5
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Quote:
Originally Posted by Plurr
Yah, you can not run 4 ohm because the way the resistance is set up on the speakers. 2 ohm would not kill them just turn the gain down...here is a wiring diagram

you can find more on cardomain and crutchfields pages.
that is exactly what I was going for, the diagram works MUCH better though
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Old 04-16-2007, 06:35 PM   #6
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So at 2 Ohms the amp puts out close to 2000 watts.

My P3'* can handle RMS 500 watts, Peak 1000 watts.

I am trying to understand "Gain" here. From what I am reading, setting it at 2 OHm and turning the Gain down, means it will pump out less than 2000 watts?

As long as I get close to 750 watts per speaker, I think I am safe.

By turning the gain down, is there a way to know how much watts your pushing to the speakers?

Is there a site for a primer on Gain? so i can understand what that does.

Thanks guys, alot!
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Old 04-16-2007, 06:45 PM   #7
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All the gain does is sets how much the amplifier outputs to the speaker. You want to set it low and work your way turning it up until you have it set where you want it. You want to make sure your speakers are not distorting. Make sure you set the gain to accommodate for the maximum volume that you will listen to the speakers, so that way you do not blow them by overpowering them, when you crank it up. The gain is usually a little ****, sometimes you have to use a screwdriver to twist it to adjust it. If you use a second gain **** or a "bass boost" **** make sure you have that turned up when adjusting the manual gain on the amp so that if you change the bass level on the bass boost **** it doesn't send too much power to your speakers.
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Old 04-16-2007, 08:52 PM   #8
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set the gain with a digital multimeter.

If you don't know how to do that google search it.
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Old 04-18-2007, 11:03 AM   #9
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Default I was wrong

Ok, I thought I had 2 ohm speakers but they are 4 ohm, wired in series to except 2 ohm setup from my current amps.

I have 4 ohms speakers and there for the t20001bd will not work for me because I can only use it at either 1 Ohm or 4 Ohm.

1 Ohm will blow the speakers
4 Ohm doesn't really help me, at least not for the money.

Thanks guys for the input.
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Old 04-18-2007, 11:14 AM   #10
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Default Re: I was wrong

Quote:
Originally Posted by myrddin70
Ok, I thought I had 2 ohm speakers but they are 4 ohm, wired in series to except 2 ohm setup from my current amps.

I have 4 ohms speakers and there for the t20001bd will not work for me because I can only use it at either 1 Ohm or 4 Ohm.

1 Ohm will blow the speakers
4 Ohm doesn't really help me, at least not for the money.

Thanks guys for the input.
are they 4ohm DVC or SVC?
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