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#1189499 - 08/31/07 08:11 PM

2ohms vs. 4 ohms

tb1
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can someone which way to go on speakers? harman kardon head unit 2ohms blaupunkt pa2100 amp 100 watts at 4 ohms 150 watts at 2 ohms both rms, do i use 2 or 4 ohm speakers and why?

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#1189760 - 09/01/07 09:08 AM

Re: 2ohms vs. 4 ohms [Re: tb1]

1FryShort
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You can use EITHER 2 ohm or 4 ohm speakers. The key, is matching the output of the amplifier as closely as possible to the thermal rating of the speaker (measured in watts RMS), while ensuring the impedence of the ciruit (measured in ohms), does not drop below the amp's minimum rating. In your case, you could get a little more power out of the amplifier if you bought some 2 ohm speakers.

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#1189781 - 09/01/07 10:17 AM

Re: 2ohms vs. 4 ohms [Re: 1FryShort]

tb1
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thanx for the input. am understanding a little better now

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#1200396 - 09/14/07 06:48 AM

Re: 2ohms vs. 4 ohms [Re: ]

TB_on_22's
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how many subs? what are the subs rated RMS? how many watts RMS does that amp put out at 4 ohms? and at 2 ohms?

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#1200435 - 09/14/07 07:24 AM

Re: 2ohms vs. 4 ohms [Re: ]

96passportsq
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Originally Posted By: JL_57

I was kinda wondering the same thing about the ohm load that I should run. If I run Alpine Type-S subs on the Alpine MRP-M 650 amp should I get the 2 ohm Type-S or the 4 ohm? I am not sure b/c I have never had DVC subs before. How should it be wired for max power?

400 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)
the above ratings are for the amp.

If you were to run one sub, you would want the dual 2ohm wired series to 4ohm to get 400watts rms because that woofer is rated at 300watts rms.

If you were to run two subs, then you would also want the dual 2ohm subs because you could wire the coils in series to get 4ohm and then parallel at the amp (because it is a monoblock amp) to get 2ohm 600 watts rms(300rms per speaker)

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#1201270 - 09/15/07 11:53 AM

Re: 2ohms vs. 4 ohms [Re: ]

sqcomp
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So we're talking subwoofers with amplifiers?

If we were talking of speakers that weren't subs, I'd tell one to listen to the difference between a 2 ohm set of components and a four ohm set that was active off an 4 ohm amplifier.

When you load to a 2 ohm impedance the amplifier will, yes, put out more power BUT...to get something you have to give something. In that case it would be more heat and more distortion across the range. You may or may not hear the distortion depending on your components and the amplifier...but it is something to take into consideration.

Personally, I'd rather go to 8 ohms and play with more signal from the source. Although I'm set up pretty sweet with my equipment to do whatever I feel like doing. Why push the noise? Become more efficient.

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Edited by sqcomp (09/15/07 11:55 AM)

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#1341441 - 03/08/08 09:20 PM

Re: 2ohms vs. 4 ohms [Re: sqcomp]

jamie_j_kidd
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heres what I use when wiring any stereo system and know the ohm load of your amp bridged most amps now are 4 ohm stable bridged
and 2 ohm stable stereo some are 2 ohm stable bridged and 4 ohm stable stereo bridge meaning subs run in a series
stereo meaning using all channels of amp used or if your amp is a mono block then it only has 1 channle
if your subs are single voice coil or dvc=dual voice coil it can be a bit trickier
but match the ohm load of of amp with the ohm load of your subs the wiring wizard on the rockford fosgate site will give you the most help but know your ohm load of subs and amp and it will give you the best way to wire them and even shows how to wire up to 4 subs

http://www.rockfordfosgate.com/rftech/woofer_wizard.asp

Edited by jamie_j_kidd (03/08/08 09:22 PM)

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