Is 4 ohms bridged actually two ohms?

Question

i have a one Dual voice coil Alpine Type R wired at 4 ohms to a two channel amp....whenever i bridge it does that 4 ohm load change to 2 ohms?

Answer 1

To address aredxwrestler112

"Your amp puts out 4 ohms"

Amps only put out power, not resistance. Thew speaker is the load, not the amp.

I would NEVER suggest using a mono block for each voice coil. The slightest difference in component values from two amps can cause the coils to heat unevenly causing the voice coils to warp.

"you don't want to burn it out by not supplying enough power. subs burn out with ...too little power, so you want something just right. "

This myth (underpowering a sub will blow it) was started in California and has been muttering life here and there from those who don't know any better. Underpowering a sub will damage it no more than turning the volume down as they are the same thing!

The problem is people have confused underpowering with incorrect gain settings.

More on this here - http://www.bcae1.com/2ltlpwr.htm

The purpose of the gain is to match the signal volts RMS coming from the source (CD player, etc.) to the input of the amp.

Here is a guide that will help you set the gain correctly http://www.datafilehost.com/download.php?file=6d26c621

You'll need a multi-meter (AC voltmeter), Microsoft Excel and a way to burn an audio CD from an MP3.

If you don't have Excel, e-mail me and I'll send you a condensed version [e-mail]

This site http://www.subwoofertools.com/forum/setgain.asp will also do the same.

See my site for more info http://spkrbox1.spaces.live.com

Answer 2

A lot of people like to say that a bridged amplifier "sees" half the load impedance, but it's not really true. Impedance is a characteristic of the speakers, and it's not affected by the amp setup. A 4-ohm speaker is a 4-ohm speaker no matter what it's connected to.

An amplifier that's stable for a 2-ohm load in 2-channel mode is usually only stable for 4 ohms in bridged mode. That's where the "sees half the impedance" myth comes from.

Answer 3

the ohms or load is a measure of the speaker nothing more nuthing less. the specs on the amp is relative to a particular load, but it does not change it. so if your sub is wired to 4 ohm, it is 4 ohm. bridging the amp does not change the speaker impedance. what it does is "add" the two channels, which means double the wattage but also double the min load. so a amp that puts 100x2 @ 2 ohm would be 200x1 @ 4 ohm.

Answer 4

regrettably, the backside impedance you may adequately gain with that amp and those subs is 4ohms. (series parallel) As for the terminals on the amp, they are run parallel internally. So the two facets with 4 ohms the two element/ or 2 ohms in basic terms using a million element. you're additionally terrific suited in questioning you will need yet another same amp to get issues working optimally. good success

Answer 5

Your amp puts out 4 ohms, so by splitting that by two, you are dividing the output by 2. 4 ohms divided by 2 is 2 ohms. i would suggest using a mono block for each voice coil. that's the set up i have but my sub is type x. i use it for competitions, and just pleasure and it sounds much better using mono block for each voice coil instead of bridging. make sure the sub u have will operate at 4 ohms, you don't want to burn it out by not supplying enough power. subs burn out with too much or two little power, so you want something just right.

Answer 6

Yes, because you are paralleling the draw. If your amp isn't 2ohm stable, then the draw could burn it out.