My subs are acting different.

[Boomin_tahoe 5,000+ posts]

Volume at 30?????? That's my Alpine HU's max volume. What on earth is the max volume on your HU?? Also....you don't want ANY airleaks in any sub enclosure....sealed or ported, simply because of unwanted noisees.

 

[Juice0723 10+ year member]

The max volume is 62.

 

[JuicyJeff 10+ year member]

62 wow. Your subs are menstrual btw, its that time.

 

[audioholic 5,000+ posts]

An enclosure leak would simulate a larger enclosure, and yes, allow the sub(s) to bottom out prematurely. The situation you describe would, I think, require an awfully large leak however. I still suspect a signal voltage issue.

 

[Juice0723 10+ year member]

I don't think it was a leak. I just switched the enclosure for the subs. Still sounds like it bottoms out. Maybe I just need a subsonic filter or something. Because I don't think my amp has one. Does the 880prs have one?

I'm just thinking that there is too much room back there unlike my old trunk car. So the subs are just unloading easy. I thought it should be way louder with a hatch.

 

[audioholic 5,000+ posts]

How was the enclosure different? Did you try any of my suggestions?

 

[schackel 10+ year member]

phase?

 

[Juice0723 10+ year member]

I put the subs in a completely different enclosure. Made sure everything was correct. Like all the positives & negatives. The subs do produce sound and get somewhat loud. Like it sounds good at low volume. Then I turn it up to where Its just as loud as before but it bottoms out.

I also tried moving the box around. Pointed it up to the roof and to the rear. And pushed it forward and put it close to the hatch.

 

[audioholic 5,000+ posts]

I put the subs in a completely different enclosure. Made sure everything was correct. Like all the positives & negatives. The subs do produce sound and get somewhat loud. Like it sounds good at low volume. Then I turn it up to where Its just as loud as before but it bottoms out.
I also tried moving the box around. Pointed it up to the roof and to the rear. And pushed it forward and put it close to the hatch.

A 'completely different enclosure' does not tell us how it was different. For all we know, it has the same internal volume and specs as the previous box, but its simply a 'different' box. Like if I screwed my ex-girlfriend's identical twin, and still got crabs. You know, if she had a twin.
Enclosure location/direction wont make that significant of a difference in cone excursion. It might affect it somewhat through front loading differences, but not to the point you describe. Again, the subs now bottoming out so significantly sooner on your volume control really only points to a change in the enclosure, which has pretty much been ruled out unless the new enclosure has the exact same problem, or its a signal voltage difference. Comments you made earlier about installing a line driver seem to indicate you dont fully grasp what is going on in your signal chain, which only reinforces what I suspect.

 

[audioholic 5,000+ posts]

And oh yeah, you still haven't discussed altering phase to see how perceived volume is affected.

 

[Juice0723 10+ year member]

The box I just put in there is 1.62cuft tuned to 40hz. The old box was around 1.6cuft tuned to 33hz.

How do I alter the phase? Switch the pos and neg speaker wires?

 

[audioholic 5,000+ posts]

The box I just put in there is 1.62cuft tuned to 40hz. The old box was around 1.6cuft tuned to 33hz.

If anything, that would make the problem worse, not better.

How do I alter the phase? Switch the pos and neg speaker wires?

If the amp doesn't have a phase switch, yes.

 

[Juice0723 10+ year member]

I tried switching the wires, didn't sound like it made a difference.

 

[audioholic 5,000+ posts]

So excursion went up, while perceived output went down, when going from a trunk to a hatchback... and altering phase and position/direction didnt change it? Either you have a real mystery on your hands, are BS'ing us (not saying you are), or you are mistaken in some way. That just doesn't make sense. At all.

What cars are we talking about specifically? And why are you up this late???

 

[Juice0723 10+ year member]

well it bottomed out again with the phase different. Its only 12:00am. I don't know why its doing this. I'm not BS'ing anyone. I never had this problem before. I went from a sunfire to a caliber.