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The driver is flushed mounted on a large surface area.
Basically these panels have little or no Diffraction Loss above 100Hz.
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Frequency Response on ICE Baffle
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Frequency Response in Box
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Using calculated values of circuit components, a filter can be constructed and
installed between the amp and the driver as shown in the schematic. Now you need to
listen and tweak until it is just right for your room, system, and personal taste. I usually
perform the following steps to arrive at the final configuration.
1. Adjust the value of Rbsc
a) If the bass is still too weak, then the amount of attenuation is too little.
The value of Rparallel should be increased until the bass seems to be
balanced with the rest of the SPL spectrum.
b) If the speaker sounds dull and lifeless, the value of Rparalllel is too high.
Reduce the value of Rparallel to bring life back into the music.
c) Continue adjusting Rparallel until the speakers sound right to your ears. It is
probably best to use acoustic music as a reference during this adjustment
period.
d) To remove the effect of the baffle step correction circuit completely,
substitute a piece of speaker wire for Rparallel.
2. Adjust the value of Lbsc
a) Depending on the final value of Rparallel, the original calculated value of
LBSC might need to be changed slightly. This sets the frequency range
over which the baffle step filter attenuates the midrange and high
frequencies. If the mid bass sounds depressed, then a lower value of LBSC
should be used. I typically perform this adjustment last once I am satisfied
with the balance, between the very low bass and the midrange, I have
achieved with the resistor.
b) Decreasing the value of LBSC will tend to warm the sound of the speaker if
the previous value produced a depressed mid bass response.
c) Always round down to the next available inductor size, having too low of
an inductor value is a lot less problematic then having too large of an
inductor value.
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Calculate Baffle Diffraction Loss