I just picked up my some Jl audio 18w6 in really great Cond (I think) i got them form a friend that I trust dearly. (was even there when he bought them) I Built the boxes perfectly to JL specs. Now i just tried to wire one of them up to my Zapco Ref 350 Bridged. It sounds really muddy at low volumes. Could I be underpowering the speaker? I tried the other speaker and it sounded the same. I even tried different amps and head units. I will try to get a video of whats it sounds and looks like. I think it's like a scratchy noise from the coils when you gently push down on the cones Sounds like it may be a shifted magnet which is common if its dropped... no burnt smell or anything like that Any Suggestions?
so...at loud volumes its OK? If the speakers were dropped, bent or installed in an unsquare metnod..then you may have issues. This is a hard to diagnose thing over the net... if you push down on the cone in the center...and put NO lateral movement to the cone....it should NOT make a scratching noise.....It is a close tolerance gap between the voice coil and magnet... first initial impression from your post sounds like they are toast.... The subs are NOT under powereed...you cannot underpower a speaker...unless you run your 100 watt amp like a freakin 500 watt amp and send a ****load of square waveforms to the voice coil....which is DC current and will fry them like eggs on a cast iron skillet...
ok thanks! yes..... when I turn it up it seems to be fine... at low volume the speaker dosent even move or any sound comes form it.. its crazy.. then at a little higher it makes a scrathing sound then smooths out when turned up.. by the way I have the DVC wired in Parrell neg to neg and pos to pos on one speaker. Have my zapco ref bridged (it says 4 ohms) so are my subs running at 3 ohms? if there dual 6 ohms?
A video of my problem http://www.youtube.com/watch?v=ve7vNuvYi2Y I once read how you are "suppose to" fix a rubbing voicecoil. The problem is it isn't centered in the gap. What you are suppose to do is pry up the back plate (hard if the magnet is really strong) and put little wedges between the magnet and the back plate. once you have the BP pried up you can slide it into center and then take out the wedges. This is assuming the pole piece is what was off center. Is this good advice? I did find a sweet spot wher it didnt rub at all
Sounds like a melted voice coil to me. When driven hard, it's pushed out of the bad area. And no, if that's a 2-channel amp, you're running it at 1.5 Ohms.
Thanks for your reply, well I finally took the woffer apart and acually fixed it by aligning the magnet and the voice coil, so it dosent rub. I glued the dust cap back on and it works perfect.. There's only one thing. How do I sucure the magnet from moving again? I took a fast turn the other day only to have my box slide against the side wall of my vehicle, and it moved the magnet, so I had to take it apart all over again. Now I have it working again. I'm going to sucure the box this time. Just wondering if there is a way to glue the magnet and stop it from moving out of place? Tom
