can you get free money at futureshop too? infinities are like 300 someodd. Im starting to consider the DIY route, if it wasnt for the complex crossovers, a TMM or an MTM floorstander would be very nice. I guess its time to start checking pawn shops ETC, for a 5.1 compatable reciever. Back on topic, the sag on the dayton sub is .5mm, how can that make any difference in output? or more prone to bottoming? its quite rare to run the sub .5mm away from bottoming.
.5mm isnt going to be anything huge on your excursion, and it will further prevent driver bottoming if anything(unless your sub is mounted magnet down). Something I have learned about cone sag is, you can actually use it to your advantage. If you find a driver that has a good amount of sag, then get a pair, mount them clamshell isobaric, and voila. One sub sags out, the other sags in, and your one way linear excursion is INCREASED by the amount of sag. Typically linear excursion is increased anyhow due to the fact that the BL curve is rarely symmetrical to the line Xmax= 0. I.E. on dumaxt tests the adire brahma shows 25mm one way excursion inward, and 30mm one way excursion outward before BL drops below 71%. If you mounted two brahmas clamshell isobaric you would get ~30mm one way excursion.
But one driver would be out of it's motor's flux for the last 5mm of travel on each stroke, and would only be driven by coupling of the other driver. Seems like the net system motor strength would drop by half past 25mm.
The average BL of the two drivers doesnt drop below 50% until ~33mm one way excursion. At 30mm the BL would be right around 8 N/A. 71% BL is reached at 29.5mm. The average BL curve is EXTREMELY flat between -18mm and +18mm with less than .2N/A of change from 14.5N/A. At least thats the way it would look if dumax is 100% accurate. Here's what I did, I took the dumax graph, then I overlayed a mirrored image of the measured curve, then averaged the two curves to get the red curve. Image is below
Attachments
- Status
- Not open for further replies.