so i just got a JL 12w3v2 and a fosgate amp. Im running the 300w rms to the sub and it seems like under a lot of the bass the sub moves to much and buzzes. Is this normal with the gain probably 1/3 of the way up. It just doesnt seem right with the power im sending to the sub.
ok well it still buzzes with the gain all the way down. Im running a 4 gauge wire to the amp and for the ground. Could a bad ground cause this, i think the bolt was rather small at where it was grounded. but the sub should be able to handle the power when the gain is like half way up right?
ok well i made a new ground with a 3/8" bolt. it helped a little, and then i dropped the gain a little and turned the crossover on the amp up so it wouldnt play the really low notes. its a little better but still seems a little buzzy, could it be anything else?
ok well the ground is a 4 gauge wire thats probably 3 feet long, and the rca cables dont get near the power cord until like a foot away from the amp. also the buzzing just occurs at high volumes, it seems like the note is like to low or somthing for the sub to play. It definetally the sub though, i can stand there and watch it happen.
There's not too many two channel amps stable at 2 ohm bridged. Wired in that fashion the thing would be attempting to produce four times the rated power at 4 ohm stereo(8 ohm bridged). You could be supplying a bit too much power with a bit too much distortion with a two channel setup.
Well im pretty sure its a mono amp, its a p3001. if there were 2 inputs for speaker wires would that make it a 2 channel amp. but if not im pretty sure that its a monoblock. Im starting to wonder if i got the wrong sub and i wired it to a 1 ohm load, would that cause a problem?
I noticed that the amp has a bass boost feature. Run that thing flat, i.e. turn it all the way off to 0dB boost. In a sealed box you could be very well over driving that thing. If you want more output(3 dB+) a ported enclosure per JL's specs would be a better choice as the sub's cone is damped(barely moves) at the box's tuning frequncy with most of the output coming from the port.
Ground wire shouldn't be 3 foot long. Around 18" or less is optimal, basically, make it as short as possible. It may help with the noise, at least to an extent. And typically that sub will reach it's potential around 300 watts RMS, it may be distorting or similar. The crossover on that amp should be only LPF and not HPF, you don't need a subsonic filter on a sealed box sub.
If you really want to control that sub and keep it from overexcursion, then a ported box is the way to go IMO. Tune it low and you won't have much trouble with overexcursion as long as you don't drop below tuning. By your description and watching the sub, it seems that the sub itself is making the noise by it's own means via overexcursion, possibly at resonance of the system, which is a point where overexcursion is easily reached.
well the amp had either a lpf or hpf. when it was on lpf it buzzed more, so i just used the lpf from the head unit and set it at 80hz and the rose of the bottum of that a little on the amp, it worked a little i guess. So basically the buzzing sound is just the sub distorting because its to loud? and the ground is probably like 2 feet long max i think, but i cant make it any shorter.
ok so yeah when i tested it the bass boost was all the way up, so fishy ur saying just turn that all the way down and adjust the gain from their. ok that was probably the problem then. and yeah that is my amp, and im sure i bought the D4 version of my sub i just wasnt sure if thats what came in. ok Another question, the buzzing sound is harmful to the sub right?
The buzzing sound could be the sub distorting, but I can only go so far off of a forum, as you know I'm sure. Anyway, it sounds as if you have a problem with overexcursion at lower frequencies, what type of music are you listening to when you notice this buzz the most? If possible, try and name a specific song that many are familiar with, that way we know roundabout how low the song gets.
well i turned the bass boost all the way down, it still buzzed a little. could the head unit be causing it. I have an alpine cda-9830... i was running it with the sub volume all the way up and the media xpander on, should those be down/off?
alright well with equalizer and everything off the buzz is gone, but theres no real bass left in songs. i dunno i guess i can just live with it. It just seems like the sub cant handle wat it should be able to.
Actually you may be better off trying to get better output with the gains alone. Set your h/u at about 2/3rds volume on your loudest track and with EVERYTHING flat increase gain til it gets nasty then back it off some. You can then mess with your EQ and the bass boost, but do so in moderation and remember when using the EQ its easier to cut an unwanted frequency than it is to boost a missing one. If you want more bass I wouldn't recommend using an EQ for that. You'll usually end up with something worse than you started with.
well the sub still works though.... wouldnt that ruin the sub?
Ran across this post and thought I'd throw in my 2 cents. If you're getting a buzz from a sealed box, make doubley sure that the box is completely sealed. Any little leak will cause a small buzz at volume. Might not be it, but I've seen it twice.