Hifonics Colossus-ltd Dual Monoblock 3200w Rms Class D Car Sub Woofer Amplifier Logo
Michael Colley Posted on May 20, 2012
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Hifonics colossus-ltd dual monoblock amp does not have much output, running a cerwin vega stroker dual 2 ohm sub wired 4 ohm load bridged

Just installed the amp and am using a tsunami 10 farad cap. wired the amp as per the instructions but there doesn't seem to be much volume from the sub. I tried the left and right channels and no difference, so I tried the bridged arrangement and still no difference. The sub is rated at 1200 watts rms so I need alittle help figuring this out.

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Chris Ward

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  • Posted on May 22, 2012
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Bridge at 4ohms your only getting 600watts rms. You will need to bridge at 1ohm (parallel) and adjust the gain accordingly. This will give it 1600 watts rms. If you would of had a dual 4ohm sub, then you could of bridged it at 2ohms mono, but you can't you have to go either 1 ohm or 4ohm. I believe it's not getting enough power.

I’m happy to help further over the phone at https://www.6ya.com/expert/chris_7f7f91eb941fb23f

  • Travis Petersen
    Travis Petersen Feb 26, 2022

    This whole “dual monoblock“ business looks like deceiving wordplay to me. From the manufacturer. Seems to be a two channel amplifier to me, with extra low ohms ratings per channel. You can even bridge them it says. With a DVC two ohm sub which is 1200 W rms, I would go with wiring the sub parallel (1 ohm) and then wiring that wire pair to one unbridged channel on the amp. This would be 1600 W RMS and enough to cook your sub pretty quick. Easy on that gain knob on whichever channel you use, and make sure to turn any bass boost settings all the way down. If you have a ported box (with the back seat folded down in a sedan), you can at least smell when to turn it down. Although it shouldn’t make that smell if you adjusted the gain properly to match the head unit volume. If you really wanted to use both channels you could run one coil to each channel and get the same end result, 600w per coil. Wait nope, that would be a four ohm DVC… But now that I think of it this would probably he better on the amp as the cooling would be spread out over more heat sink surface area because you wouldn’t be pushing all the power through just one channel. Would have to be really careful with the gain settings. Assuming the mono block part of the product name means that the RCA input pair signal is automatically summed mono internally. You would not want to run a left and right stereo signal to each individual coil of a DVC sub. Also, the gains and other settings on each channel must be set identically if individually powering the coils of a DVC sub, each with their own separate channel. So yeah, wire the sub coils parallel to just one channel for 1600 watts, or each channel to a separate coil for 2200 combined watts, Or wire the sub coils 4 ohms in series and send the positive and negative wire to which ever positive and negative terminal on each of the amps outputs is marked for use when running in bridged mode. Still going to be 2200 watts.

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