Hi Everybody;
First I'd like to start off telling you what a great resource you have created. I've surfed through here many times for both referance and enjoyment .
Now my problem. I have a D130-f that seems to need reconing every month or two . The problem is always voice coil rub. The reconing is done by a local tech that has been both a JBL Pro-Audio dealer and service rep for over 30 years. He comes highly recomended and I don't think that he is the problem.
I use the speaker for bass guitar. I drive it with an older Fender Showman (85 watts RMS via vaccum tube). The speaker is mounted in a Fender tone ring cabinet (double baffle ported design).
Could my problem be from the voice coil bottoming out due to excess cone excursion? If that's the case would changing my cabinet to an infinite baffle decrease cone excursion enough to solve my problem? One reason I lean in this direction is that the same amp also took out an Altec 421-A that was mounted in a B15 cabinet (Thiele aligned port). That's another thread but it makes me wonder if a tighter cabinet would solve my dilema?
OR
Could the problem be that I'm getting the voice coil a little on the toasty side and it is warping? in which case adding another cabinet, or using a 2X15 cabinet in order to split the load?
Would anyone recomend upgrading to a D140-F or a E or K series? Would this significantly effect my sound and volume? In my limited understanding, isn't the reason I can get a workable stage volume from this rig because the D130-f is specifically engineered for this type of set up? Wouldn't an E or K series require more power to get the same volume? Wouldn't a D140-F have more mids? I Really like the sound of this set up if only it wouldn't blow .
Please be gentle with me.... I'm well aware that I'm a happy moron .
Thanks for reading.
Tim