I'm building a pair of full range speakers and looking at the data sheet the Xmax of 1.8mm seems to low for any kind of normal volume. It is a 10" driver.
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You don't say what this mystery driver is, but not really. Xmax varies with motor & suspension design, and also what you mean by it: it is not necessarily a physical property per se, just an approximate guideline to the linear travel region. There are a number of different methods to derive a number for it, which tend to give different results if you applied them to the same drive unit. Most manufacturers don't state what method they used to create the figure they used either; if they provide enough data on coil length, gap etc. you can sometimes tell if they used one of the purely physical derivations, but that depends on how much data is provided. In this case, it looks to be a medium-higher efficiency unit for the size, based on nO, SPL, Vas, so the stated travel is roughly what I'd anticipate seeing.
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The plus / minus of 1.8mm would appear to make it a 3.6mm total stroke.
Is there a problem with that?
Is there a problem with that?
This driver is probably meant to be powered with a low watt amp.
In a 42L sealed box with quite a bit of damping you will reach about 75Hz with a Q of 0.72 or so.
A 10W amp will reach 103dB from 75Hz upwards for 1.8mm stroke, the mid frequencies need to be attenuated with a L|C|R filter to compensate for the baffle step and higher efficiency (shape of cone)
So a good choice for this scenario.
In a 42L sealed box with quite a bit of damping you will reach about 75Hz with a Q of 0.72 or so.
A 10W amp will reach 103dB from 75Hz upwards for 1.8mm stroke, the mid frequencies need to be attenuated with a L|C|R filter to compensate for the baffle step and higher efficiency (shape of cone)
So a good choice for this scenario.