Modifications, Accessories & Audio System for Swift

Thanks Ami,

If I have 2 channels with the output each 100 RMS and if it is bridged then the circuit output will be 200 RMS continuous?

Should speaker RMS should be always marginally higher than the amplifier RMS?

Amplifier    Speaker/ Sub

200 RMS    200 RMS – OK

200 RMS    180 RMS - What will happen here? (Will the speaker may damage)

200 RMS    220 RMS - What will happen here?

What about Dual voice coil speaker any idea?

If I connect the as per the below diagram then input impedance to the Amplifier will be 2 Ohms hence the amplifier can produce more RMS continuously

Handling separate mono for the sub instead get dual voice coil speaker and connect according to the diagram speaker impedance will become 2 ohm, amplifier 1004 can produce 150 RMS at 2Ohm  bridging 2 Channel output will be 300  RMS.

How about DVC configuration?

What will be price difference between the dual voice coil and single voice coil speaker?
Dapping is required for the rear speaker is fitted in the door and driven from the Head unit?

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Thanks Prasad

When you bridge two channels you dont simply add them up. There is a different formula to check it up. Will post it when I find it. In case of 1004 it is between 300-320 in bridged mode.

Needn't be. It is preferable that the speaker's RMS matches with that of the amp.

It would work fine in all the cases and there wont be any speaker damage as the full power wont be provided. (It is limited by some means)

A normal sub or a speaker has only one voice coil. A DVC would have two voice coils. Both of them would be on the same axis and driving the same cone. Something liked by enthusiasts.

It runs on the simple law that we have studied in school physics. Resistances in series and parallel.

We dont have to get a DVC sub just to get the impedance down to 2OHMS. All we need to do it get a 2OHM sub. Which is not very hard to find. The continous power would be more than 300 in this case.

In 4 ohm bridged mode, 1004 generates around 300-200 WRMS which is more than sufficient to drive a decent sub.

Let me call the positive terminals (p1,p2) and the negative terminals (n1,n2).

DVC can be wired in three ways. One is the Parallel as shown below. Another in Series mode where p1 is connected to n1. (p2,n2) is connected to the amp. Here theimpedance becomes 8 ohms.

Last would be the direct mode where (p1,n1) is connected directly to the amp and so is (p2,n2). Here the impedance would be 4 ohm each.

DVC would cost almost the doube.

dapping? Please repeat the question.

Thanks

Damping is required for the rear speaker if it is fitted in the rear door and driven from the Head unit?

Nope.

Well if the amp under consideration is the 1004-i would advice not to wire the DVC in parallel.

Let me explain:-

The 1004 is rated like this

100W x 4 at 4ohm

280Wx 2 at 4ohm

140W x 2 at 2 ohm

Now the 1004 is a stereo amp and not a mono so it wont be stable in 2ohm bridged mode.(the amp can fail over a period of time).

So ideally if getting a DVC it better to wire the two coils in series.

The other option is to get a SVC amp at 4ohm impedence.

Cant we think of wiring the Voice Coils separate. That would make it run at 4 Ohms.

Thanks Binoy,

From your statement if DVC then better drive it with mono amplifier.

280Wx 2 at 4ohm use it to drive SVC SUB

Correction: It would deliver 320WRMS.

I guess it can be bridged into a 2 channel and use each channel to drive the 4OHM Voice coils.

Mono would be quite costly unless you source it from outside.