DVC subwoofer wiring methods

[stevo1210]

I just got my hands on a Jaycar (local brand) CS-2278 subwoofer with a Kevlar cone for literally peanuts.
It was in a crappy looking box that looked all beat up... wasn't until I opened it to discover a dual voice coil sub! (explains why it was so heavy!).
Now It says 250W RMS on it, but that's like max power I think?
The previous owner wired it in series as in red to black from one coil to the other.
My amplifier is a car amplifier (for the Jukebox) and it's a Kenwood DAC-624 model 2ch amp where I can bridge the connections to pump out 110W per channel at 4 ohms.

Here's the performance sheet:

http://www.subwoofer-builder.com/driver-CS-2278.htm

Since mine is wired as "2 series coils", I get 8 ohms right? Does that mean the output from my amp will be 220W instead of 110W? I don't know how this works

[momaka]

Re: DVC subwoofer wiring methods

Since mine is wired as "2 series coils", I get 8 ohms right?

Yes

Does that mean the output from my amp will be 220W instead of 110W?

No, not quite. As far as I know, the output power of an amplifier decreases with increasing speaker impedance.

Is your car amplifier 2 channel single-ended and 1 channel bridged (BTL)? Or can it do 2 channels BTL? If the latter, then you can wire each coil to each BTL channel separately. If the former, you can wire the speaker coils in parallel to get 2 Ohms and wire that to the single BTL channel. Must check the data sheet or spec sheet for your amplifier, though - not all car amplifiers can handle 2 Ohms or lower impedance.

According to the spec sheet of your subwoofer driver, each coil can handle up to 125 Watts (most likely this is peak and not RMS, though). That means the whole woofer driver can handle up to 250W itself. You can do this in 3 ways:
- Wire the coils in parallel (2 Ohm impedance) and drive with a single channel on the amplifier (provided the amp is even rated to output 250W at 2 Ohms)
- Wire each coil (4 Ohms) to its own channel and drive separately from the amp (then the amp must be capable of driving 125W into each channel into 4 Ohms).
- Wire the coils in series (8 Ohm impedance) and drive with a single channel on the amplifier (provided the amp can drive 250W into 8 Ohm load).