[MOSFET]

Thanks greg.
Nick
"GregS" wrote in message
...
In article , "SKaReCRoW"
skarecrowatatgmaildotcomdotcom wrote:
I wouldn't even suggest you try it. Best case scenario is you can only
give
the subs 1/2 of the power.

"A common misconception with regard to dual voice coil speakers is the
assumption that nothing changes if you power only one of the voice coils.
With only one coil hooked up, a dual voice coil speaker will suffer a
loss
in reference efficiency of about 3dB (only half the coil windings are
being
energized) as well as a significant shift in its Thiele/Small parameters.
This renders any enclosure calculations inaccurate unless you remeasure
the
speakers parameters with only one coil hooked up. Failure to account for
the
different parameters of a dual voice coil speaker with only one coil
powered
can result in very poor performance."

Above quote is taken directly from JL Audio's website at
http://mobile.jlaudio.com/support_pages.php?page_id=163

Sometimes things are done with the other coil for some crazy reasons. I
know I
could find a reference in my 20 year reading Speaker Builder magazine. I
just
wanted to say, you would be able to drive the single coil with more than
1/2 rated
power since overall heat is basically in the same place.

Only using one coil will almost certainly require a larger box to
compensate for
decreasing Qts.

greg


So would it be worth it to you to get more power to subs that can handle
less, and are 3dB less efficient? I'd bet not.

"MOSFET" wrote in message
om...
I will start by saying the obvious answer to my question is to "just try
it". But in the interest of educating myself, I would appreciate some
information.

I recently bought 2 15" subs, each has dual 4 ohm voice coils. They
are
both being driven by an Alpine Class D 850 watt amp (MRV-850, I think).
This mono amp is 2 ohm stable, yet there is no way to configure the
four
voice coils to reach a 2 ohm load (I could connect all four in parellel
but that would be a 1 ohm load and I KNOW from experience I could
damage
the amp). They are connected now so that my amp sees a 4 ohm load
(through a combination of parellel and series wiring).

The question I have is regarding the possibility of connecting just one
voice coil from each sub and wiring that to my amp, giving me a 2 ohm
load
and more power from my amp.

HOWEVER, undoutedly there is a cost to doing this, like my subs become
capable of handling 1/2 the power they used to. As I recall from posts
in
the past, the coils overlap each other on the former so I was thinking
that by doing this I wouldn't lose excursion. Or would I?

Basically, my question boils down to this; does the increased power
produced by a 2 ohm load exceed the benefits of having both coils
connected.

Any information on this subject would be appreciated.

MOSFET