ALTEC 515B DRIVER SLAP

[ALTEC802]

HI,I HOPE SOMEONE CAN HELP ME ON THIS ONE!,I JUST ASSEMBLED A SYSTEM USEING 825 CABINETS N501 8A CROSSOVERS,511B HORNS AND 515B WOOFERS THAT WERE RECENTLY RECONED AS AN 8 OHM VERSION FROM GPA.MY PROBLEM IS AT HIGHER VOLUMES THE CONES HIT THE BAFFLE BOARD,I KNOW THIS IS NOT CORRECT.THE CONES SEEM TO HAVE A VERY LOOSE SUSPENSION,IS THERE SOMEWAY TO SOLVE THIS PROBLEM,IM ONLY USEING A 35 WATT RECIEVER.I WAS THINKING OF DOUBLEING UP THE MOUNTING GASKET TO SOLVE THE PROBLEM,ANY HELP ON THIS ISSUE WOULD BE GREATLY APPRECIATED!. THANKYOU,STEVEN.

[GM]

Greets!

515Bs have very compliant suspensions with limited Xmax (linear one way travel) so adding another gasket is a 'recipe' for disaster. 35W doesn't go very far with these drivers WRT LF response so my first thought is that you're either clipping the amp due to excessive bass boost and/or playing music or movie soundtracks that have significant output below ~60 Hz.

Bottom line, assuming no damage to the drivers (such as loose spider glue joints) and no air leaks around the driver, XO, or rear cover, this is a midbass system that needs a sub to fill in the bottom two octaves. That, or swap to a 416 series driver, though it takes corner loading to somewhat flatten out the 825's natural stepped response.

GM

P.S.: Using all caps is the on-line equivalent of shouting.