LSPCAD 5.25 DOWNLOAD DRIVERS
LSPCAD 5.25 DOWNLOAD SOFTWARE

I can then try out different lengths of pipe quite easily and cheaply. So I have cut a 40mm diameter hole in the rear baffle that is just the right size to accept the 1.5 dia PVC drain pipe readily available from home DIY centres.

LspCAD will certainly give me an optimum value, but I may find that detuning the system resonance a little may enhance the subjective performance more on that later. At this point I won t be fitting the final port as I want to tune the exact length by ear. You should certainly avoid putting the port near the cabinet walls where energy levels are low and muffled by the internal damping material. However as this also amplifies the standing wave in the enclosure I would advocate placing the port away from the antinode, say at 25% of the cabinet height. Again, for ultimate efficiency it is often advocated that you put the port at an antinode where the air excitation inside the enclosure is the highest. If you want to show off your port then by all means put it on the front baffle there is room under the bass unit.

At the 36Hz frequency that WD18BR is tuned to, the path length difference between the port and bass unit is short compared to the wavelength, and the port area is too small to enjoy mutual coupling from the bass unit, so it really doesn t have an audible effect. Actually I ve only found this to be true where the system is ported at a relatively high frequency, say 80Hz or more (e.g.

You may see this mentioned in some treatises on bass reflex design that the port should be positioned close to the bass unit for good mutual coupling. Offsetting this is a possible lack of integration between the port output and the bass unit. There is a fair amount of midrange output and mid bass harmonic distortion produced by a port and I m quite happy to lose this by letting the speaker box hide it from the direct output of the speaker. In addition, hiding the port on the rear also hides it acoustically. As is the fashion when I design bass reflex enclosures I have put the port on the rear of the cabinet, and this is more than just a cosmetic fad! An extra hole in the front baffle just weakens its rigidity, as well as looking, to my eyes, unsightly, so the rear baffle is a better place for it. So for our first prototype I lined the internal walls with a layer of SONIQS CDF making sure that the route from bass unit to port is kept clear of obstructions. (SEAS drive units are available from Typically bass reflex enclosures give optimum performance with just an internal lining of cabinet damping. We have planned and built a prototype cabinet to give us the 18 litres net volume that LspCAD predicted would work well with the SEAS H1215 or H1217 drivers.

LSPCAD 5.25 DOWNLOAD SOFTWARE

Again we will be using LspCAD6 Lite (you can download a free trial version from co.uk) but you can use your own measurement software and still follow along. Having investigated, with the help of LspCAD6 lite, the virtual performance of enclosure concepts and suitable bass units, it is now time to do some real measurements. Last month we looked at the options available when designing a bass reflex speaker and this resulted in our first project, the WD18BR.

LSPCAD 5.25 DOWNLOAD DRIVERS

1 Designing Speakers Part 10 WD18BR Crossover Development Measuring loudspeaker drivers is the only way to develop a crossover.

Lspcad 5.25 download