I just completed my new box we talked about in a different thread. It is a simple sealed enclosure. Roughly .7 cu ft per sub (right at recommended for the sub) Agian they are X-tant type M's, running a Alpine 3553 4 channel amp. The box is up against the back seat with the sub pointed towards the tailgate. Some bass notes sound real good (the low tones) the higher bass notes seem to make the subs "float" or "warbble" I tried messing with alot of the settings from the HU and nothing really makes it sound any better. The amps gain is at about half. The subs are wired in stereo (one sub bridged on channel 1/2 and one sub bridged on 3/4. The low pass filter position is selected on the amp. What could cause this? Underpower? Overpower? Trying to get too much out of 2 10's in a trunk? In general I can make it sound OK but for turining it up and trying to get a good variety of bass notes I am not real happy. Any suggestions would be great.
Subs are 200 rms. Amp is 120x2 bridged rms. Subs sound pretty good most of the time, just certain bass notes sound like crap. If the polarity was off would it ever sound good?
eh.. true.... it wouldn't sound good ever, but did you at least try it? If they're DVC, maybe they're only running one voice coil, (hook up problem) hah, I'm stumped, let me know what the problem is.
SVC... Have not tried the looking at the wires, I am at work. Could it have something to do with heat? I noticed it after being in the car for a couple of hours today. The car sat for a couple hours, when I went to lunch things sounded good. Not sure if my hearing is off and I was trying to get too much at highway speeds.
Extreme cold doesn't really affect the sound too much...but the coil gap will tighten up after the coils warm up...but sound quality isn't really affected
What frequency do you have your low pass set to? Have you tried positioning the box differently? Maybe move it towards the back 4-6" or more....Face subs up. or face them down with a 2" spacer between the box and the floor of the trunk? Are you sure the other speakers are not trying to produce the higher bass notes and what you are hearing is not the sub, but the other speakers? Just curious and throwing out ideas... Willy
It very well could be the factory rear deck speakers I am hearing. Could the sound waves created by the subs affect the rear deck speakers? Should I put a baffle, or some other blocker to "protect" the rear deck speakers from the subs sound waves. I built the box to specifically sit like it is, so I would really like to keep it in that position.
Have you tried inverting the phase of the subs? wire them 180 degrees out of phase with the rest of your stereo.......that means hook the speaker wires up backwards......might be amazed at what that can do!!!!
Good point.....Could be getting some frequency cancellation..... I have seen times when the xover point of the sub lies in that upper or mid bass region, depending on the slope you may have upper bass frequencies that are being reproduced fully by the rear speakers and partially (or not much at all, or fully) out of the subs....if the sub is pushing the same freq as the rear speakers, you could be getting this flutter....if you flip phase like viking said, you could be letting them both reproduce the sound wave, but just fractions of a second apart....This will let them out without clashing... Willy
Yep, what willy said...... Here is a more detailed explanation if ya wanna do a little reading, deals with passive x-overs more but explains some of the theory http://www.caraudiotalk.com/audio-forum/showthread.php?t=3758
