2ohm or 4ohm sub???

Risk_ldp · 02-18-2006, 07:18 PM

which is better and why?? thanks for ya'lls oppinion..

kirbycope · 02-18-2006, 07:43 PM

it doesnt matter, less ohms, the louder/more wattage they are. all subs can be wired in different configurations from 8 ohm to 1/2 ohm. It really depends on the wattage/ohm rating of your amp.

Risk_ldp · 02-18-2006, 07:53 PM

good to know, thanks... new to caraudio learning more daily...

mbuchman · 02-19-2006, 02:54 PM

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http://www.bcae1.com/

-Matt

Farrow099 · 03-04-2006, 04:05 AM

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3onDubs · 03-04-2006, 02:55 PM

Quote: Originally Posted by kirbycope

it doesnt matter, less ohms, the louder/more wattage they are. all subs can be wired in different configurations from 8 ohm to 1/2 ohm. It really depends on the wattage/ohm rating of your amp.

It depends on the amplifier powering the subs and the number of subs that you have. If you have a mono amp that is one ohm stable....your going to watn to take advantage of that fact and configure your subs so that you can wire them down to 1 ohm. 2 dual 4 ohm subs, for example, can be wired together down to 1 ohm, while one 2 ohm sub can be wired down to one ohm. You should basically pick out the subs you want and then get the amp to match.

Risk_ldp · 03-05-2006, 08:33 PM

ive got a kenwood that says @ 1ohm is 900 watt... also copped the alpine type R supposed to only 500watt rms--- should i wire this @ 1 ohm???

Genesisfactor · 03-05-2006, 09:38 PM

NO

if your kenowwood has 900W rms and the same as another guy's on the forum, you can make it 4 ohms at 550W, which is find for the subs.

Here's the thing. The impedance (ohms) depends on what you plan to do. If you get a hgih powered sub and want to run multiple subs, you can do it wiht either 2 2Ohms subs in parrallel (4ohms total) or 2 4 ohm subs in series (2 ohms). That's where impedance matters. Your amp, however, can push more power with less impedance, so you can choose subs based on that.

***same thing 3on said, but i hope it makes it a bit clearer. If you wnat, make a list of subs you want and the amp you have and i'll mix and match***

DavC · 03-06-2006, 03:12 AM

Quote: Originally Posted by Genesisfactor

Here's the thing. The impedance (ohms) depends on what you plan to do. If you get a hgih powered sub and want to run multiple subs, you can do it wiht either 2 2Ohms subs in parrallel (4ohms total) or 2 4 ohm subs in series (2 ohms). That's where impedance matters. Your amp, however, can push more power with less impedance, so you can choose subs based on that.

Surely 2x 4ohm subs in series would be an 8ohm load?

Genesisfactor · 03-06-2006, 06:49 AM

damn it i reversed them! Thanks DavC. Do the OPPOSITE of what i said!

3onDubs · 03-06-2006, 10:51 AM

I don't know that much about ohmage (as i'm new to calculating them), but i think that if you have 2 4 ohm subs, than you can either run them together at 1 ohm or 4 ohm. If you have 2 2 ohm subs, than you can either run them together at 2 ohms or half an ohm.

You should look at the maximum power handling that your sub has. This number is usually much higher than the rms number. If they can handle up to 900 watts max, than you should be fine and you'll really be pushing that sub. If it's a 2 ohm sub, you can wire it to 1 ohm, but if it's a 4 ohm sub, than you can wire it to 2 ohms.

sssssss27 · 03-06-2006, 01:31 PM

The way to calculate impendance is like so. For series you just add them together, so if you had two 4 Ohms subs in series you would get 8 Ohms.

For parrallel you use the equation 1/Ohms + 1/Ohms until you run out of voice coils, then 1/Answer. For two 4 Ohms subs in parallel you would get 1/4 + 1/4 = .5 and then 1/.5 = 2 so you would have a final impendance of 2 Ohms.

You want to match the impedance to where your amp won't be pushing out too much wattage for your subs, more ohms is generally better for an SQ approach and less ohms is generally better from an SPL approach. I'm sure in your situation you will just want to match it to what your amp supports.

Epon · 03-06-2006, 10:04 PM

So let me get this straight... I'm assuming I have the same Kenwood amp that is rated at 1ohm stable... my sub is dual voice coil @ 4 ohms... please tell me how I should wire this...

Snootch · 03-06-2006, 10:39 PM

Quote: Originally Posted by Epon

So let me get this straight... I'm assuming I have the same Kenwood amp that is rated at 1ohm stable... my sub is dual voice coil @ 4 ohms... please tell me how I should wire this...

If your sub is dual voice coil, and each voice coil has an impedance of 4 ohms, you can wire both coils together in paralell like this:

This wiring will have the amplifier "see" a 2 ohm load. I assume you have the KAC-9152D amplifier? The amp will produce 900 watts RMS at a 2 ohm load like that.

DavC · 03-07-2006, 08:15 AM

to get the most volume out of your speakers, you want to wire them in a way that their impedance is equal to the lowest stable ohm rating of the amp. If this is not achieveable, wire them in a way that they are the lowest rating ABOVE that of the amps lowest.