![]() ![]() Now use the LT spreadsheet to see what components & resulting EQ you need to get the desired response. IOW, set the box size while working with the power I would be using. Whenever I used to use the LT spreadsheets, I would generally use the separate tools for what they do best. The box size and stuffing only change how much power you need to put in at a given frequency to get some SPL level. In other words, you can't change the excursion you need to get a specific SPL. While it should be fairly obvious, I think we should remind everyone that when looking at any sealed system, SPL is excursion. The LT spreadsheet deals with system Q, Fb, and modifications to them, as allowed by the amount of boost/reduction in system Q. ![]() IOW, box size and stuffing do effect system Q, but box size overwhelmingly effects excursion (stuffing actually does have minor effects to excursion, at least on the graph). it is possible to build a box that is power-limited, not excursion limited. A smaller box can sufficently limit excursion for a given power. this volume may be larger than the volume from unibox if unibox is modelling the box as heavily stuffedĢ) The excursion graph to be used is the one from unibox. Don't attempt a radical change in system Q if you only intend a small L/T boost of, say, 3-6 dB.īossoTo restate this the way I think I understand it, and you can yea or nay me?ġ) The volume that gets plugged into the LT spreadsheet is whatever volume is required to achieve the system Q prior to application of LT. IOW, stuffing affects system Q but not excursion resistance. Model the L/T with the apparent box size due to stuffing, but use the excursion graph of the model that has the actual size of the box plugged in. I guess ultimately my question is does the LT spreadsheet, or even the LT circuit simply modify Qtc and Fb of a system (which might be dervived from a variety of box volumes and stuffing levels), and volume plays no part in the equations. 677? This would be a volume closer to 85-90 liters. 677 (as modelled in Unibox), do I enter a sufficent box volume in the LT spreadsheet to get an unmodified Qtc of. This reasonably closely matches what Unibox will give you for either an unstuffed or lined-wall box with same driver/same volume (the final number is probably mid-way between the unstuffed/lined box numbers for Qtc)Īnyway, If hypothetically I wanted to LT a heavily stuffed 60 liter box with a Qtc of. for example you enter a given volume and it gives you the unmodifed (by the LT) Qtc of the box/system. The LT spreadsheet seems to treat the box volume as if it was unstuffed. ![]() The problem is trying to transfer data from Unibox to the LT spreadsheet. I've also got this FRD consortium LT spreadsheet which is a handy tool. Box volume, driver, and the amount of stuffing varies Qtc of the box in Unibox. The box volume is the biggest thing controlling excursion. I've sorted out Unibox and figured out why my graphs were whacked out. ![]()
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