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Pioneer TS-D6902R 6"x9" Coaxial Speaker Pair 360W
Ported Box Build
Assuming the "Xmax is likely 4mm", what size ported box would be ideal to build a home speaker with these? (Port I.D.-Length)
Unfortunately the Xmax spec tells us nothing regarding a ported enclosure size. These speakers will have a high Qts which makes them perfect for free air applications in car doors and decks, so they will really work best in a medium to large sealed enclosure.
Date published: 2013-07-09
What is this driver's Xmax
What would be a close estimate to these drivers' excursion limit?And why don't car speakers have any parameters like regular home speakers do?
Normally, midbass/midrange drivers' coil winding width is limited to 18mm, in many cases it is 16mm. I looked around for top plate thickness and could not find it. 8mm is very common, but some companies like to intensify flux in a very tiny gap. I've seen both from Pioneer. If the top plate is 8mm thick, your one-way linear Xmax is likely 4mm and up to 5mm. If the top plate thickness is of the 4.5mm variety, you will have 5.75mm up to 6.75mm of linear Xmax. Without tearing one apart to measure the winding width, we can't say for sure. It's a spec that most companies just don't publish on mids/highs. The safe route is to turn your highpass crossover all the way up and turn your volume up to normal listening levels; then slowly turn the filter down until you reach that point where the bass just starts to sound a little muddy. Turn the filter just a hair back up into the clean sounding zone and you are ok. That keeps the driver much safer from damage and is VERY likely that you've set the gain within 1mm of the driver Xmax.
Date published: 2012-11-13