2 Amps 1 Sub

[Blu84Rex 10+ year member]

I have a SWR-1242D. Right now its getting around 500W rms at 2 ohms My amp is rated at 385W rms at 4 ohms. What would happen if I put 2 amps at 385W rms at 4 ohms, one amp per coil? Need help asap. Leaving state in the morning.

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[JohnBlayz142 10+ year member]

If it's the same amp, you can do it but you will want to set the gains with an oscilliscope to make sure they are evenly set.

 

[Blu84Rex 10+ year member]

What if you dont have an oscilliscope? Can you do it with a meter? If so How?

 

[ultimate157 5,000+ posts]

You can use a DMM and make sure the voltage on both terminals are as close as possible (using a test tone)

I have a 45hz 0db test tone. PM with email if you need it.

 

[ultimate157 5,000+ posts]

You got email.

All you gotta do is run another set of RCA's to the 2nd amp, and make sure the AC voltage is the same coming out of both amps.

Since you said 385w @ 4 ohms, sqrt(385*4) = ~39 volts.

So you burn the tone to a CD as is, turn the volume on the HU to the max you will use, and play the tone. (make sure the sub is disconnected from each amp.

Turn the gain knob while measuring the voltage and try to get each one as close to 39v as possible (remember to have it on AC voltage)

Reconnect sub, play. Have fun.

 

[Blu84Rex 10+ year member]

If I do put 385w to each VC would it damage/overload the sub? The manual for it says

Power Handling (RMS/Peak) 500W/1500W

Power Range (RMS) 200W-500W

So should I cut the power to it to 250w per coil?

 

[ultimate157 5,000+ posts]

If I do put 385w to each VC would it damage/overload the sub? The manual for it says
Power Handling (RMS/Peak) 500W/1500W

Power Range (RMS) 200W-500W

So should I cut the power to it to 250w per coil?

Doubt you would have any problems with that RMS wattage. Most people around here put 1000 watts to their R's and they handle it nicely.