Posted by Eric Gonzales [ 68.4.166.113 ] on October 17, 2007 at 23:39:25:
In Reply to: Addendum: new amplifier posted by Eric Gonzales on October 17, 2007 at 23:06:45:
By the usual T/S pipe-horn calculations Greg Monfort came up with, it'd need a bloody big box due to that high 0.657Qt (see specs sheet 003 you sent). Footprint would be ~150in^2, plus build materials, which is a bit daft for a small driver.
However, due to Vas being low, an under-sized box with a CSA of 65in^2 can be used, because although the LF drops off compared to the ~'ideal', in the LF it's still at least 10db over the driver's nominal IB response, & ~flat to about 34Hz & that's before room-gain kicks in. See the example FR I've attached for a 64in tall box with driver 27.75in down & 65in^2 terminus CSA. The low Vas also means the box air-mass should still be sufficient to help keep the the driver in check. Basically, it's not going to be too critical. Minimum CSA 65in^2, anything you can add to that up to about 145in^2 is a bonus. The 64in tall box BTW looks favourite to me, so it's tuned fractionally below Fs.
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