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On Nov 20, 11:16 pm, Chris Hornbeck
wrote:
Also to be noted is that the 3 dB efficiency gain of ported
systems is really only applicable in the narrow range of the
port's output.

Not correct. Most importantly, the port does not ADD
to the woofer's output over the narrow range, it REPLACES
the driver's output over this narrow raange.

But, more importantly, the 3 dB increase in efficiency is oft cited
and equally often misunderstood. Taking any give driver and
putting in a ported enclosure WILL NOT increase the efficiency
of the system by 3 dB.

The 3 dB results because, for a given enclosure volume
and bandwidth, the driver used for a ported version CAN BE
as much as 3 dB more efficient in the optimum case
(maximum efficiency C2 sealed alignment vs maximum
efficiency lossless B4 alignment results in a 3 dB increase
in system efficuency).

If you have a specific driver, your system efficiency is set,
no matter WHAT enclosure you put it in. The issue is
what type of enclosure, how big and what's the bandwidth
that results.