Wiring 4 channel amp to a single sub?

[srt4geezer 10+ year member]

I have 2 RF amps that I have 2 use. First is a 750x, 2nd is a punch 600.4

I want to use one of them to power the fronts & rears (what it was designed for) the other I want to power a single sub in a sealed custom enclosure. I would like your recommendations on how to wire this & what sub would best fit the amps I have at my disposal. I know there are better ways to do it, but I have to work with what I have. Thanks for your help.

Also, I am not a pro with the ohms & bridging so a good explination may be in order for the wiring.

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[srt4geezer 10+ year member]

anyone?

 

[camry_tuner 10+ year member]

you could bridge two of the channels on one of those 4 ohms, and you could wire a dual 2 ohm sub to 4 ohms, or get a single 4ohm sub

 

[SSS 18734 5,000+ posts]

whats the voice coil configuration of the sub?

 

[srt4geezer 10+ year member]

I figure I would need a dual voice coil. Not sure what Ohm. Dual 2ohm or dual 4 ohm. Connect each bridged side of the amp to a coil & what ohm would that be? The RF 750x can be bridged to 375x2 at 4 ohms. Does that work?? What DVC Sub is that wattage optimum for? I was hoping for a single 12" DVC in a sealed box. Hopefully one that requires a smallish box.

 

[Prowler573 5,000+ posts]

Is it possible to run a single DVC subwoofer off of a 4ch amp that's bridged to 2ch mono?

The simple answer is "Yes."

The underlying problem is getting the output signal of each bridged channel to match exactly so that each coil is reacting in unison to one another. Without getting that matched up pretty precisely you run the risk of premature voice coil failure (no one wants that)

If you're wanting to go with a single sealed 12" because of space limitations and you're absolutely dead set on using the pair of four channels you already have rather than getting a two channel or monoblock unit then I would strongly suggest going with a pair of smaller drivers that are designed for small sealed applications (a pair of 8s or 10s).

Doing what you're suggesting is technically possible but it's not a project for the novice to tackle.

 

[adam71 5,000+ posts]

Prowler is correct. I did 2 (dual 4ohm) 12's with 2 sepearate 4 channel amps (PRS-X340) and it took some time to get the gains right. If I were to do it again I would have went with a 2 ohm stable 2 channel which would have made it alot easier. Because with mine not only did I have to match the 2 bridged channels in each amp but then I had to go and match the two different amps with each other..........it was a headache.

 

[srt4geezer 10+ year member]

I guess I would have the same issue with a DVC 10". Are there 2 10's that I can use in a single box with around 1.5 airspace? What are some good small enclosure 10's that would run well off 375 watts RMS. If I bridge both sides of the four channel into 2 channels, what ohm does that get me for the 2 channels?

If I were stuck with a single 10" for space reasons, how would I measure the output of each channel? Dual Volt meters?

Thanks for the help guys

 

[srt4geezer 10+ year member]

where'd you go?

 

[srt4geezer 10+ year member]

bump-

 

[adam71 5,000+ posts]

If I were you I would go with a single 12 if space is a concern. A small sealed enclosure will not be that big at all. You could get a dual 4 ohm voice coil sub and run your "bridged" 4 channel amp which will only be stable to 4 ohm in bridged mode. One side of the amp to each 4 ohm voice coil.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[srt4geezer 10+ year member]

What would be the best sub for a sealed enclosure that will work with 375x2 @4ohm.