impedance question

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Nazareth

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Joined: April 17, 2003

Location: United States

Posted: May 12, 2004 at 9:44 PM / IP Logged

looked on the forum b4 i asked a newblarish question and its not on here sooooo . .

can anyone tell me the benies of the apline type r 10" with 4 ohms as oppossed to the one with 2 ohms? they're both the same price and all specs are identical what would make u choose one over the other? if i like the number 4 rather than 2? =) thanx for the help

Naz

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stevdart

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Joined: January 24, 2004

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Posted: May 12, 2004 at 9:51 PM / IP Logged

Have you decided on the number of subs you will be using, and the amp that will power them? That knowledge will get you your answer.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

thapimpfromchi

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Joined: July 30, 2003

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Posted: May 12, 2004 at 11:44 PM / IP Logged

yea, the ohms only differ for ease of connection. If you have a amp that puts out peak power at 1 ohm, and you only want 1 sub, then get the 2 ohm version, or if you want 2 subs, get them 4 ohm version, if you have a amp that puts peak power at 2 ohms, and want only one sub, get the 4 ohm, or for 2 subs, get the 2 ohm version. its kinda confusing, but its all on how its wired. What kind of amp do you have and how many do you want. Once we know that we can tell you which would be better for your amp.

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sam1

Copper - Posts: 151

Joined: March 03, 2004

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Posted: May 13, 2004 at 3:50 PM / IP Logged

take a look at this http://www.crutchfieldadvisor.com/S-xHEt0z5HdNA/learningcenter/car/subwoofers_wiring.html?subs=2 this should explain it a little better. also, check out ohms law in the little list on the left.

Nazareth

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Joined: April 17, 2003

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Posted: June 06, 2004 at 7:22 PM / IP Logged

i've choosen 2x 1041D's but haven't decided which amp would be best yet. sticking with alpine but figuring out whether i want two amps (one for subs and one for speakers) or one amp for everything. i'll prolly end up going for two amps since i'm going to expand the system eventually into the truck bed itself.

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stevdart

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Posted: June 06, 2004 at 7:55 PM / IP Logged

Two dual 4 ohm subs ( connected together ) will net either a 4 ohm or a 1 ohm impedence on an amp, when bridged. The 1 ohm impedence means an amp would have to be rated to 1/2 ohm ( stereo ). There are some mono class D subwoofer amps that are rated down to 1 ohm.

Another connection option, if you are building two enclosures, is to connect each sub to a channel, voice coils in parallel for 2 ohms each ( 2 ohm stereo ). So... separate at 2 ohms stereo, bridged onto an amp at a combined 4 ohms, or connected to a mono amp rated to 1 ohm, on which you can use them at 4 ohms or at 1 ohm.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Nazareth

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Joined: April 17, 2003

Location: United States

Posted: June 09, 2004 at 8:09 PM / IP Logged

ok i think i've just about settled on one. since i decided to go the multi amp route i'ma get the Alpine MRV-T420 its a 2 channel that can be bridged to mono at 340 RMS. my type r's are 300RMS so i'd be over shooting the mark by a little bit. but question still remains that if the amp is 340 that means it will power both speakers at such a rating correct? it wont be halfed to 170RMS because i'm powering two subs. if thats the case i guess i'ma need other suggestions on a mono amp.

Thanks for the help guys

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stevdart

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Posted: June 09, 2004 at 8:38 PM / IP Logged

If the amp is specified as "bridged output mono, 340 RMS @ 4 ohms" or to that effect...then the number of subs you use will share that 340 watts. Two will get no more than 170 each.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

forbidden

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Posted: June 09, 2004 at 8:38 PM / IP Logged

I do not think this is a match made in audio heaven, matter of fact I think it will set you up for failure. The subs can handle safely 300w rms each split amongst the 4 voice coils. This means that the total rms power handling will be 600w rms at either 4 ohm mono or 1 ohm mono. The amp you choose should be rated for as close to this as you can get. The amp that you have chosen is in fact rated at 240w rms x 1 at 4 ohm mono. This will drastically underpower the subs. Now it is OK to underpower a sub and if the gain is set properly it will never damage the sub but you are buying subs because you want bass, my bet is that you will not get what you need from an amp that is so small. If you underpower a sub and clip the output of the amp then it will destroy your subs. You need to find a much larger amp and it can be any brand that will do the required task.

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impedance question

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