2 subs, or a single paired with this amp?

**senseless228** · 06-05-2006, 06:36 PM

if i have a rockford p6002, its rated at 220watts per channel at 4 ohms...

if i get a type-R alpine sub, a 12", which has an RMS of 500...would it be wiser to get 2 subs, and each have 220watts? or to have it bridged, and get 440watts to 1 sub? however it says total RMS watts @ 2 ohms is 699watts...

are my calculations even correct?

what would be the best setup matched with this amp? i'd prefer clarity more than dB

**XC-C30** · 06-05-2006, 07:26 PM

i would say, bridge 2 channels/sub or look for an amp that rates nearby 1000watts RMS @2Ohm and wire your voice coils in parallel

so if you're only going to use 1 sub it will get about 400-440watts if you get the channels bridged

**senseless228** · 06-05-2006, 07:37 PM

well the thing is, i already have this amp, and im not gonna buy a new amp...but is my assumption correct, that i'd be getting 220 watts per sub if i have 2, and around 440 watts for one sub?

**RedGTiVR6** · 06-05-2006, 08:58 PM

that amplifier is rated at 150 x 2 @ 4 ohms or 600 x 1 @ 4 ohms

not quite sure where you got your ratings from but they aren't right.

http://www.cardomain.com/item/ROCP6002?ref=deal

That's the amplifier, right?

If you have two entry level, high effenciency subs, you can go with two, something like a JL W0 would be fine or the new W1s that are out there.

If you would rather have a single sub, you could go with a much beefier sub. All depends on how much space you have.

Two entry level high efficiency subs and one beefier sub, the costs are going to be about the same.

**senseless228** · 06-05-2006, 09:29 PM

well, i know those are the standard ratings, but from the rockford performance certificate, it has those ratings, and i have heard from several sources that the ratings they supply to websites are a good amount less than they actually output...but, even with the standard ratings they supply, would the 150w on each type-r sub be a waste? seeing as how the RMS on the type-r is 500w?

and why such a drastic fall from 600w x 1 divided by 4 when you're only splitting to 2 channels? why such a drastic fall? i'm not questioning the numbers, but just curious as to the reasoning.

**Jahntassa** · 06-05-2006, 10:56 PM

Originally Posted by senseless228

well, i know those are the standard ratings, but from the rockford performance certificate, it has those ratings, and i have heard from several sources that the ratings they supply to websites are a good amount less than they actually output...but, even with the standard ratings they supply, would the 150w on each type-r sub be a waste? seeing as how the RMS on the type-r is 500w?

and why such a drastic fall from 600w x 1 divided by 4 when you're only splitting to 2 channels? why such a drastic fall? i'm not questioning the numbers, but just curious as to the reasoning.

That's the concept of bridging. When you have a two channel amplifier and you 'combine' the two channels in a bridge, typically you can get a much greater output than the two channels seperately. I don't know the exact mechanics of it, but that's how it goes.

Aren't the Type R's DVC subs? 4Ohm x 2? If so, you'd need two subs so you could wire them as a single 4 Ohm sub to get the full 600w out of that amplifier, otherwise you'd be seriously underpowering them.

**blazinaspire** · 06-05-2006, 11:50 PM

from what i understand its because 2ohm is less resistance and so it puts out more, just like if you put 4 people in you car its going to drive slower ( more resistence ) but thats just how i look at it

**senseless228** · 06-06-2006, 06:50 AM

the type-r's are dual voice coil...but i really dont understand what that means, i'm assuming it has 2 + and 2 - for the wiring? and if thats the case, i'd have to wire 2 subs on the 2 channels, however if they have dvc, it'd be like wiring in series or parallel because each sub has 2 of each?

**RedGTiVR6** · 06-06-2006, 07:50 AM

Originally Posted by blazinaspire

from what i understand its because 2ohm is less resistance and so it puts out more, just like if you put 4 people in you car its going to drive slower ( more resistence ) but thats just how i look at it

when you bridge an amplifier you are causing it to THINK it has a 2 ohm load per chanel. Think about a series circuit, 2 ohms + 2 ohms = 4 ohms. Therefore, each channel is seeing a two ohm load, therefore, it's putting out power @ a 2 ohm load.

putting a 500 watt sub on 150 watts isn't optimal.

underpowering a sub leads to blowing the sub...

think of it this way:

you are not giving that sub what it needs to preform at optimal. so you in turn crank the gains to try and get more out of it, which means you are introducing distortion, and DISTORTION is what blows speakers.

for that amplifier, I'd go with a single sub, bridged, and get a decent amount of power out of it, rather than tying to go for quantity

(the whole quality over quantity argument)

**Jahntassa** · 06-06-2006, 09:34 AM

Originally Posted by senseless228

the type-r's are dual voice coil...but i really dont understand what that means, i'm assuming it has 2 + and 2 - for the wiring? and if thats the case, i'd have to wire 2 subs on the 2 channels, however if they have dvc, it'd be like wiring in series or parallel because each sub has 2 of each?

There are literally two voice coils, so yes, there'd be two positive and two negative terminals.

Each voice coil is rated at 4 Ohms, so you'd have 4 Ohm + 4 Ohm. If you connected this straight to the amp (say with one speaker to your two channel amp), you'd be putting 150w into each side of the sub, which would not be optimal. Nevermind the fact that there could be a volume difference between the two channels when connected this way which could cause problems because both coils aren't running the exact same signal.

If you have two Type-R's, you can wire it so both subs connect together, then can get bridged to the amp at 4 Ohms, thereby getting the 500w the amplifier can put out when bridged.

I'd agree with Red GTi, if you don't want to switch amps, find a sub with the power requirements that match that amplifier's bridged output and go with that. You can get a sub that is rated for less power than the amplifier, because you can always turn down the amplifier's output.