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Re: Supravox 215-2000EXC-OB differences.

Hi,

> If both were put in indidividual and identical large volume
> (60 + liters) closed baffles/box, which would have a better bass?

That would depend entierly on your definition of "better".

The 215-200 EXC at 12V fieldcoil voltage will start rolling off below 200Hz reaching -6db @ 90Hz and 50Hz @ -12db. The 215-2000 EXC-OB will in the same show around 2db peaking at 100Hz and a -6db point of slightly above 50Hz.

Both of course without accounting for baffle loss and room effects.

> What would be the efficiency of each ....db/watt/1meter (estimate)

If we assume 12V Fieldcoil Voltage for both the midband efficiency of the standard EXC would be around 100-101db/2.83V/1m (beware, the driver warrants a 6 Ohm Impedance rating due to 4 Ohm DCR, meaning this db/2.83V/1m is higher than the db/1W/1m rating) while the OB Version would be 97db/2.83V/1m.

Basically, as one can determine from the Qt of the drivers, at standard 12V Fildcoil voltages the standard EXC is best suited to Horns and the OB to Open baffles or large sealed boxes.

If you reduce the Fieldcoil Voltage you can make the standard EXC more suited to reflex or sealed boxes and the EXC-OB to smaller physocal size open Baffles. I am not sure how far one can overdrive the fieldcoil Voltage wise, both in terms of heat development and gain in flux strangth.

Ciao T

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