Wiring 0.75 ohm to 1 ohm rated amplifier… Is it safe?

General
1

I just got two Hifonics subwoofers: 1000W RMS each and they are dual voice coil. The coils are actually 3 ohms each instead of 4 ohms like I expected.

My amplifier specs are:
700W RMS at 4 ohms
1100W RMS at 2 ohms
2200W RMS at 1 ohm

So now, I’m thinking of running them at 0.75 ohms or 1.5 ohms. I want to push them to their limits, but I’m worried if my amplifier will handle the 0.75 ohm load. The amp I have is a Crunch GPX4400.1D. Any thoughts?

2

Where exactly are you seeing 3 ohms?

3

Mai said:
Where exactly are you seeing 3 ohms?

4

@Nash
That’s the DC resistance, not the nominal impedance. Usually, DC resistance is about 75% of the nominal impedance. So, you likely have a 4 ohm coil there.

5

Oaklan said:
@Nash
That’s the DC resistance, not the nominal impedance. Usually, DC resistance is about 75% of the nominal impedance. So, you likely have a 4 ohm coil there.

Ah, got it. Thanks for explaining that so clearly!

6

Oaklan said:
@Nash
That’s the DC resistance, not the nominal impedance. Usually, DC resistance is about 75% of the nominal impedance. So, you likely have a 4 ohm coil there.

Thanks, I appreciate the help!

7

@Nash
I figured that’s what was going on. Good to have it confirmed!

8

Mai said:
@Nash
I figured that’s what was going on. Good to have it confirmed!

Thanks again, everyone! I feel much better about it now.

9

Nash said:

Mai said:
@Nash
I figured that’s what was going on. Good to have it confirmed!

Thanks again, everyone! I feel much better about it now.

No problem, hope the subs sound awesome for you!

10

The rating is 4 ohms. A lot of woofers show 3.6 ohms or 4.2 ohms. I wouldn’t put too much stock into what the amp says it can handle. Crunch isn’t known for being the best brand, so I wouldn’t stress too much. If you want to play it safe, wire each sub in series for 8 ohms, then parallel that to the amp for a 4 ohm total load. Any less load and that amp might burn out.